Публикация версии 1.75

COPYING

@@ -1,281 +1,622 @@
                     GNU GENERAL PUBLIC LICENSE
-                       Version 2, June 1991
+                       Version 3, 29 June 2007
 
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
  of this license document, but changing it is not allowed.
 
                             Preamble
 
-  The licenses for most software are designed to take away your
-freedom to share and change it.  By contrast, the GNU General Public
-License is intended to guarantee your freedom to share and change free
-software--to make sure the software is free for all its users.  This
-General Public License applies to most of the Free Software
-Foundation's software and to any other program whose authors commit to
-using it.  (Some other Free Software Foundation software is covered by
-the GNU Lesser General Public License instead.)  You can apply it to
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
 your programs, too.
 
   When we speak of free software, we are referring to freedom, not
 price.  Our General Public Licenses are designed to make sure that you
 have the freedom to distribute copies of free software (and charge for
-this service if you wish), that you receive source code or can get it
-if you want it, that you can change the software or use pieces of it
-in new free programs; and that you know you can do these things.
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
 
-  To protect your rights, we need to make restrictions that forbid
-anyone to deny you these rights or to ask you to surrender the rights.
-These restrictions translate to certain responsibilities for you if you
-distribute copies of the software, or if you modify it.
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
 
   For example, if you distribute copies of such a program, whether
-gratis or for a fee, you must give the recipients all the rights that
-you have.  You must make sure that they, too, receive or can get the
-source code.  And you must show them these terms so they know their
-rights.
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
 
-  We protect your rights with two steps: (1) copyright the software, and
-(2) offer you this license which gives you legal permission to copy,
-distribute and/or modify the software.
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
 
-  Also, for each author's protection and ours, we want to make certain
-that everyone understands that there is no warranty for this free
-software.  If the software is modified by someone else and passed on, we
-want its recipients to know that what they have is not the original, so
-that any problems introduced by others will not reflect on the original
-authors' reputations.
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
 
-  Finally, any free program is threatened constantly by software
-patents.  We wish to avoid the danger that redistributors of a free
-program will individually obtain patent licenses, in effect making the
-program proprietary.  To prevent this, we have made it clear that any
-patent must be licensed for everyone's free use or not licensed at all.
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
 
   The precise terms and conditions for copying, distribution and
 modification follow.
 
-                    GNU GENERAL PUBLIC LICENSE
-   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+                       TERMS AND CONDITIONS
 
-  0. This License applies to any program or other work which contains
-a notice placed by the copyright holder saying it may be distributed
-under the terms of this General Public License.  The "Program", below,
-refers to any such program or work, and a "work based on the Program"
-means either the Program or any derivative work under copyright law:
-that is to say, a work containing the Program or a portion of it,
-either verbatim or with modifications and/or translated into another
-language.  (Hereinafter, translation is included without limitation in
-the term "modification".)  Each licensee is addressed as "you".
+  0. Definitions.
 
-Activities other than copying, distribution and modification are not
-covered by this License; they are outside its scope.  The act of
-running the Program is not restricted, and the output from the Program
-is covered only if its contents constitute a work based on the
-Program (independent of having been made by running the Program).
-Whether that is true depends on what the Program does.
+  "This License" refers to version 3 of the GNU General Public License.
 
-  1. You may copy and distribute verbatim copies of the Program's
-source code as you receive it, in any medium, provided that you
-conspicuously and appropriately publish on each copy an appropriate
-copyright notice and disclaimer of warranty; keep intact all the
-notices that refer to this License and to the absence of any warranty;
-and give any other recipients of the Program a copy of this License
-along with the Program.
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
 
-You may charge a fee for the physical act of transferring a copy, and
-you may at your option offer warranty protection in exchange for a fee.
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
 
-  2. You may modify your copy or copies of the Program or any portion
-of it, thus forming a work based on the Program, and copy and
-distribute such modifications or work under the terms of Section 1
-above, provided that you also meet all of these conditions:
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
 
-    a) You must cause the modified files to carry prominent notices
-    stating that you changed the files and the date of any change.
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
 
-    b) You must cause any work that you distribute or publish, that in
-    whole or in part contains or is derived from the Program or any
-    part thereof, to be licensed as a whole at no charge to all third
-    parties under the terms of this License.
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
 
-    c) If the modified program normally reads commands interactively
-    when run, you must cause it, when started running for such
-    interactive use in the most ordinary way, to print or display an
-    announcement including an appropriate copyright notice and a
-    notice that there is no warranty (or else, saying that you provide
-    a warranty) and that users may redistribute the program under
-    these conditions, and telling the user how to view a copy of this
-    License.  (Exception: if the Program itself is interactive but
-    does not normally print such an announcement, your work based on
-    the Program is not required to print an announcement.)
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
 
-These requirements apply to the modified work as a whole.  If
-identifiable sections of that work are not derived from the Program,
-and can be reasonably considered independent and separate works in
-themselves, then this License, and its terms, do not apply to those
-sections when you distribute them as separate works.  But when you
-distribute the same sections as part of a whole which is a work based
-on the Program, the distribution of the whole must be on the terms of
-this License, whose permissions for other licensees extend to the
-entire whole, and thus to each and every part regardless of who wrote it.
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
 
-Thus, it is not the intent of this section to claim rights or contest
-your rights to work written entirely by you; rather, the intent is to
-exercise the right to control the distribution of derivative or
-collective works based on the Program.
+  1. Source Code.
 
-In addition, mere aggregation of another work not based on the Program
-with the Program (or with a work based on the Program) on a volume of
-a storage or distribution medium does not bring the other work under
-the scope of this License.
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
 
-  3. You may copy and distribute the Program (or a work based on it,
-under Section 2) in object code or executable form under the terms of
-Sections 1 and 2 above provided that you also do one of the following:
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
 
-    a) Accompany it with the complete corresponding machine-readable
-    source code, which must be distributed under the terms of Sections
-    1 and 2 above on a medium customarily used for software interchange; or,
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
 
-    b) Accompany it with a written offer, valid for at least three
-    years, to give any third party, for a charge no more than your
-    cost of physically performing source distribution, a complete
-    machine-readable copy of the corresponding source code, to be
-    distributed under the terms of Sections 1 and 2 above on a medium
-    customarily used for software interchange; or,
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
 
-    c) Accompany it with the information you received as to the offer
-    to distribute corresponding source code.  (This alternative is
-    allowed only for noncommercial distribution and only if you
-    received the program in object code or executable form with such
-    an offer, in accord with Subsection b above.)
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
 
-The source code for a work means the preferred form of the work for
-making modifications to it.  For an executable work, complete source
-code means all the source code for all modules it contains, plus any
-associated interface definition files, plus the scripts used to
-control compilation and installation of the executable.  However, as a
-special exception, the source code distributed need not include
-anything that is normally distributed (in either source or binary
-form) with the major components (compiler, kernel, and so on) of the
-operating system on which the executable runs, unless that component
-itself accompanies the executable.
+  The Corresponding Source for a work in source code form is that
+same work.
 
-If distribution of executable or object code is made by offering
-access to copy from a designated place, then offering equivalent
-access to copy the source code from the same place counts as
-distribution of the source code, even though third parties are not
-compelled to copy the source along with the object code.
+  2. Basic Permissions.
 
-  4. You may not copy, modify, sublicense, or distribute the Program
-except as expressly provided under this License.  Any attempt
-otherwise to copy, modify, sublicense or distribute the Program is
-void, and will automatically terminate your rights under this License.
-However, parties who have received copies, or rights, from you under
-this License will not have their licenses terminated so long as such
-parties remain in full compliance.
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
 
-  5. You are not required to accept this License, since you have not
-signed it.  However, nothing else grants you permission to modify or
-distribute the Program or its derivative works.  These actions are
-prohibited by law if you do not accept this License.  Therefore, by
-modifying or distributing the Program (or any work based on the
-Program), you indicate your acceptance of this License to do so, and
-all its terms and conditions for copying, distributing or modifying
-the Program or works based on it.
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
 
-  6. Each time you redistribute the Program (or any work based on the
-Program), the recipient automatically receives a license from the
-original licensor to copy, distribute or modify the Program subject to
-these terms and conditions.  You may not impose any further
-restrictions on the recipients' exercise of the rights granted herein.
-You are not responsible for enforcing compliance by third parties to
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
 this License.
 
-  7. If, as a consequence of a court judgment or allegation of patent
-infringement or for any other reason (not limited to patent issues),
-conditions are imposed on you (whether by court order, agreement or
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
 otherwise) that contradict the conditions of this License, they do not
-excuse you from the conditions of this License.  If you cannot
-distribute so as to satisfy simultaneously your obligations under this
-License and any other pertinent obligations, then as a consequence you
-may not distribute the Program at all.  For example, if a patent
-license would not permit royalty-free redistribution of the Program by
-all those who receive copies directly or indirectly through you, then
-the only way you could satisfy both it and this License would be to
-refrain entirely from distribution of the Program.
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
 
-If any portion of this section is held invalid or unenforceable under
-any particular circumstance, the balance of the section is intended to
-apply and the section as a whole is intended to apply in other
-circumstances.
+  13. Use with the GNU Affero General Public License.
 
-It is not the purpose of this section to induce you to infringe any
-patents or other property right claims or to contest validity of any
-such claims; this section has the sole purpose of protecting the
-integrity of the free software distribution system, which is
-implemented by public license practices.  Many people have made
-generous contributions to the wide range of software distributed
-through that system in reliance on consistent application of that
-system; it is up to the author/donor to decide if he or she is willing
-to distribute software through any other system and a licensee cannot
-impose that choice.
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
 
-This section is intended to make thoroughly clear what is believed to
-be a consequence of the rest of this License.
+  14. Revised Versions of this License.
 
-  8. If the distribution and/or use of the Program is restricted in
-certain countries either by patents or by copyrighted interfaces, the
-original copyright holder who places the Program under this License
-may add an explicit geographical distribution limitation excluding
-those countries, so that distribution is permitted only in or among
-countries not thus excluded.  In such case, this License incorporates
-the limitation as if written in the body of this License.
-
-  9. The Free Software Foundation may publish revised and/or new versions
-of the General Public License from time to time.  Such new versions will
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
 be similar in spirit to the present version, but may differ in detail to
 address new problems or concerns.
 
-Each version is given a distinguishing version number.  If the Program
-specifies a version number of this License which applies to it and "any
-later version", you have the option of following the terms and conditions
-either of that version or of any later version published by the Free
-Software Foundation.  If the Program does not specify a version number of
-this License, you may choose any version ever published by the Free Software
-Foundation.
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
 
-  10. If you wish to incorporate parts of the Program into other free
-programs whose distribution conditions are different, write to the author
-to ask for permission.  For software which is copyrighted by the Free
-Software Foundation, write to the Free Software Foundation; we sometimes
-make exceptions for this.  Our decision will be guided by the two goals
-of preserving the free status of all derivatives of our free software and
-of promoting the sharing and reuse of software generally.
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
 
-                            NO WARRANTY
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
 
-  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
-FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN
-OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
-PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED
-OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
-MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS
-TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE
-PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,
-REPAIR OR CORRECTION.
+  15. Disclaimer of Warranty.
 
-  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
-WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
-REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
-INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
-OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
-TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
-YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
-PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGES.
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
 
                      END OF TERMS AND CONDITIONS
 
@@ -287,15 +628,15 @@ free software which everyone can redistribute and change under these terms.
 
   To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
-convey the exclusion of warranty; and each file should have at least
+state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.
 
     <one line to give the program's name and a brief idea of what it does.>
     Copyright (C) <year>  <name of author>
 
-    This program is free software; you can redistribute it and/or modify
+    This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 2 of the License, or
+    the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
 
     This program is distributed in the hope that it will be useful,
@@ -303,37 +644,31 @@ the "copyright" line and a pointer to where the full notice is found.
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
 
-    You should have received a copy of the GNU General Public License along
-    with this program; if not, write to the Free Software Foundation, Inc.,
-    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 Also add information on how to contact you by electronic and paper mail.
 
-If the program is interactive, make it output a short notice like this
-when it starts in an interactive mode:
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
 
-    Gnomovision version 69, Copyright (C) year name of author
-    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
     This is free software, and you are welcome to redistribute it
     under certain conditions; type `show c' for details.
 
 The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, the commands you use may
-be called something other than `show w' and `show c'; they could even be
-mouse-clicks or menu items--whatever suits your program.
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
 
-You should also get your employer (if you work as a programmer) or your
-school, if any, to sign a "copyright disclaimer" for the program, if
-necessary.  Here is a sample; alter the names:
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
 
-  Yoyodyne, Inc., hereby disclaims all copyright interest in the program
-  `Gnomovision' (which makes passes at compilers) written by James Hacker.
-
-  <signature of Ty Coon>, 1 April 1989
-  Ty Coon, President of Vice
-
-This General Public License does not permit incorporating your program into
-proprietary programs.  If your program is a subroutine library, you may
-consider it more useful to permit linking proprietary applications with the
-library.  If this is what you want to do, use the GNU Lesser General
-Public License instead of this License.
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

Makefile.am

@@ -1,5 +1,8 @@
 ACLOCAL_AMFLAGS = -I m4
-SUBDIRS = src doc
+SUBDIRS = src
+if HAVE_DOCS
+SUBDIRS += doc
+endif
 CLEANFILES = *~
 EXTRA_DIST = examples/blink/blink.c \
 examples/input/input.c \
@@ -8,7 +11,11 @@ examples/spi/spi.c \
 examples/spin/spin.c \
 examples/pwm/pwm.c \
 examples/i2c/i2c.c \
-examples/gpio/gpio.c 
+examples/gpio/gpio.c \
+examples/spiram/spiram_test.c \
+examples/spiram/spiram.c \
+examples/spiram/spiram.h \
+examples/smi/smi.c
 
 upload:
 	rsync -avz @PACKAGE_TARNAME@-@VERSION@.tar.gz doc/html/ www.airspayce.com:public_html/mikem/@PACKAGE_NAME@

Makefile.in

@@ -1,7 +1,7 @@
-# Makefile.in generated by automake 1.13.4 from Makefile.am.
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -14,7 +14,17 @@
 
 @SET_MAKE@
 VPATH = @srcdir@
-am__is_gnu_make = test -n '$(MAKEFILE_LIST)' && test -n '$(MAKELEVEL)'
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
 am__make_running_with_option = \
   case $${target_option-} in \
       ?) ;; \
@@ -75,16 +85,14 @@ POST_INSTALL = :
 NORMAL_UNINSTALL = :
 PRE_UNINSTALL = :
 POST_UNINSTALL = :
+@HAVE_DOCS_TRUE@am__append_1 = doc
 subdir = .
-DIST_COMMON = INSTALL NEWS README AUTHORS ChangeLog \
-	$(srcdir)/Makefile.in $(srcdir)/Makefile.am \
-	$(top_srcdir)/configure $(am__configure_deps) \
-	$(srcdir)/config.h.in COPYING config.guess config.sub depcomp \
-	install-sh missing ltmain.sh
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(top_srcdir)/configure \
+	$(am__configure_deps) $(am__DIST_COMMON)
 am__CONFIG_DISTCLEAN_FILES = config.status config.cache config.log \
  configure.lineno config.status.lineno
 mkinstalldirs = $(install_sh) -d
@@ -125,9 +133,9 @@ am__recursive_targets = \
   $(RECURSIVE_CLEAN_TARGETS) \
   $(am__extra_recursive_targets)
 AM_RECURSIVE_TARGETS = $(am__recursive_targets:-recursive=) TAGS CTAGS \
-	cscope distdir dist dist-all distcheck
-am__tagged_files = $(HEADERS) $(SOURCES) $(TAGS_FILES) \
-	$(LISP)config.h.in
+	cscope distdir distdir-am dist dist-all distcheck
+am__tagged_files = $(HEADERS) $(SOURCES) $(TAGS_FILES) $(LISP) \
+	config.h.in
 # Read a list of newline-separated strings from the standard input,
 # and print each of them once, without duplicates.  Input order is
 # *not* preserved.
@@ -144,10 +152,10 @@ am__define_uniq_tagged_files = \
   unique=`for i in $$list; do \
     if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
   done | $(am__uniquify_input)`
-ETAGS = etags
-CTAGS = ctags
-CSCOPE = cscope
-DIST_SUBDIRS = $(SUBDIRS)
+DIST_SUBDIRS = src doc
+am__DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/config.h.in AUTHORS \
+	COPYING ChangeLog INSTALL NEWS README compile config.guess \
+	config.sub depcomp install-sh ltmain.sh missing
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 distdir = $(PACKAGE)-$(VERSION)
 top_distdir = $(distdir)
@@ -186,6 +194,8 @@ am__relativize = \
 DIST_ARCHIVES = $(distdir).tar.gz
 GZIP_ENV = --best
 DIST_TARGETS = dist-gzip
+# Exists only to be overridden by the user if desired.
+AM_DISTCHECK_DVI_TARGET = dvi
 distuninstallcheck_listfiles = find . -type f -print
 am__distuninstallcheck_listfiles = $(distuninstallcheck_listfiles) \
   | sed 's|^\./|$(prefix)/|' | grep -v '$(infodir)/dir$$'
@@ -201,6 +211,8 @@ CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPPFLAGS = @CPPFLAGS@
+CSCOPE = @CSCOPE@
+CTAGS = @CTAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
@@ -208,6 +220,7 @@ DOXYGEN = @DOXYGEN@
 ECHO_C = @ECHO_C@
 ECHO_N = @ECHO_N@
 ECHO_T = @ECHO_T@
+ETAGS = @ETAGS@
 EXEEXT = @EXEEXT@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
@@ -268,6 +281,7 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
+runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -277,7 +291,7 @@ top_build_prefix = @top_build_prefix@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 ACLOCAL_AMFLAGS = -I m4
-SUBDIRS = src doc
+SUBDIRS = src $(am__append_1)
 CLEANFILES = *~
 EXTRA_DIST = examples/blink/blink.c \
 examples/input/input.c \
@@ -286,7 +300,11 @@ examples/spi/spi.c \
 examples/spin/spin.c \
 examples/pwm/pwm.c \
 examples/i2c/i2c.c \
-examples/gpio/gpio.c 
+examples/gpio/gpio.c \
+examples/spiram/spiram_test.c \
+examples/spiram/spiram.c \
+examples/spiram/spiram.h \
+examples/smi/smi.c
 
 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-recursive
@@ -307,15 +325,14 @@ $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu Makefile'; \
 	$(am__cd) $(top_srcdir) && \
 	  $(AUTOMAKE) --gnu Makefile
-.PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
 	  *config.status*) \
 	    echo ' $(SHELL) ./config.status'; \
 	    $(SHELL) ./config.status;; \
 	  *) \
-	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe)'; \
-	    cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__depfiles_maybe);; \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $@ $(am__maybe_remake_depfiles);; \
 	esac;
 
 $(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
@@ -328,8 +345,8 @@ $(ACLOCAL_M4):  $(am__aclocal_m4_deps)
 $(am__aclocal_m4_deps):
 
 config.h: stamp-h1
-	@if test ! -f $@; then rm -f stamp-h1; else :; fi
-	@if test ! -f $@; then $(MAKE) $(AM_MAKEFLAGS) stamp-h1; else :; fi
+	@test -f $@ || rm -f stamp-h1
+	@test -f $@ || $(MAKE) $(AM_MAKEFLAGS) stamp-h1
 
 stamp-h1: $(srcdir)/config.h.in $(top_builddir)/config.status
 	@rm -f stamp-h1
@@ -447,8 +464,10 @@ cscopelist-am: $(am__tagged_files)
 distclean-tags:
 	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
 	-rm -f cscope.out cscope.in.out cscope.po.out cscope.files
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
 
-distdir: $(DISTFILES)
+distdir-am: $(DISTFILES)
 	$(am__remove_distdir)
 	test -d "$(distdir)" || mkdir "$(distdir)"
 	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
@@ -513,7 +532,7 @@ distdir: $(DISTFILES)
 	  ! -type d ! -perm -444 -exec $(install_sh) -c -m a+r {} {} \; \
 	|| chmod -R a+r "$(distdir)"
 dist-gzip: distdir
-	tardir=$(distdir) && $(am__tar) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).tar.gz
+	tardir=$(distdir) && $(am__tar) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).tar.gz
 	$(am__post_remove_distdir)
 
 dist-bzip2: distdir
@@ -528,12 +547,22 @@ dist-xz: distdir
 	tardir=$(distdir) && $(am__tar) | XZ_OPT=$${XZ_OPT--e} xz -c >$(distdir).tar.xz
 	$(am__post_remove_distdir)
 
+dist-zstd: distdir
+	tardir=$(distdir) && $(am__tar) | zstd -c $${ZSTD_CLEVEL-$${ZSTD_OPT--19}} >$(distdir).tar.zst
+	$(am__post_remove_distdir)
+
 dist-tarZ: distdir
+	@echo WARNING: "Support for distribution archives compressed with" \
+		       "legacy program 'compress' is deprecated." >&2
+	@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
 	tardir=$(distdir) && $(am__tar) | compress -c >$(distdir).tar.Z
 	$(am__post_remove_distdir)
 
 dist-shar: distdir
-	shar $(distdir) | GZIP=$(GZIP_ENV) gzip -c >$(distdir).shar.gz
+	@echo WARNING: "Support for shar distribution archives is" \
+	               "deprecated." >&2
+	@echo WARNING: "It will be removed altogether in Automake 2.0" >&2
+	shar $(distdir) | eval GZIP= gzip $(GZIP_ENV) -c >$(distdir).shar.gz
 	$(am__post_remove_distdir)
 
 dist-zip: distdir
@@ -551,7 +580,7 @@ dist dist-all:
 distcheck: dist
 	case '$(DIST_ARCHIVES)' in \
 	*.tar.gz*) \
-	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).tar.gz | $(am__untar) ;;\
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).tar.gz | $(am__untar) ;;\
 	*.tar.bz2*) \
 	  bzip2 -dc $(distdir).tar.bz2 | $(am__untar) ;;\
 	*.tar.lz*) \
@@ -561,24 +590,27 @@ distcheck: dist
 	*.tar.Z*) \
 	  uncompress -c $(distdir).tar.Z | $(am__untar) ;;\
 	*.shar.gz*) \
-	  GZIP=$(GZIP_ENV) gzip -dc $(distdir).shar.gz | unshar ;;\
+	  eval GZIP= gzip $(GZIP_ENV) -dc $(distdir).shar.gz | unshar ;;\
 	*.zip*) \
 	  unzip $(distdir).zip ;;\
+	*.tar.zst*) \
+	  zstd -dc $(distdir).tar.zst | $(am__untar) ;;\
 	esac
 	chmod -R a-w $(distdir)
 	chmod u+w $(distdir)
-	mkdir $(distdir)/_build $(distdir)/_inst
+	mkdir $(distdir)/_build $(distdir)/_build/sub $(distdir)/_inst
 	chmod a-w $(distdir)
 	test -d $(distdir)/_build || exit 0; \
 	dc_install_base=`$(am__cd) $(distdir)/_inst && pwd | sed -e 's,^[^:\\/]:[\\/],/,'` \
 	  && dc_destdir="$${TMPDIR-/tmp}/am-dc-$$$$/" \
 	  && am__cwd=`pwd` \
-	  && $(am__cd) $(distdir)/_build \
-	  && ../configure --srcdir=.. --prefix="$$dc_install_base" \
+	  && $(am__cd) $(distdir)/_build/sub \
+	  && ../../configure \
 	    $(AM_DISTCHECK_CONFIGURE_FLAGS) \
 	    $(DISTCHECK_CONFIGURE_FLAGS) \
+	    --srcdir=../.. --prefix="$$dc_install_base" \
 	  && $(MAKE) $(AM_MAKEFLAGS) \
-	  && $(MAKE) $(AM_MAKEFLAGS) dvi \
+	  && $(MAKE) $(AM_MAKEFLAGS) $(AM_DISTCHECK_DVI_TARGET) \
 	  && $(MAKE) $(AM_MAKEFLAGS) check \
 	  && $(MAKE) $(AM_MAKEFLAGS) install \
 	  && $(MAKE) $(AM_MAKEFLAGS) installcheck \
@@ -740,7 +772,7 @@ uninstall-am:
 	am--refresh check check-am clean clean-cscope clean-generic \
 	cscope cscopelist-am ctags ctags-am dist dist-all dist-bzip2 \
 	dist-gzip dist-lzip dist-shar dist-tarZ dist-xz dist-zip \
-	distcheck distclean distclean-generic distclean-hdr \
+	dist-zstd distcheck distclean distclean-generic distclean-hdr \
 	distclean-tags distcleancheck distdir distuninstallcheck dvi \
 	dvi-am html html-am info info-am install install-am \
 	install-data install-data-am install-dvi install-dvi-am \
@@ -752,6 +784,8 @@ uninstall-am:
 	mostlyclean-generic pdf pdf-am ps ps-am tags tags-am uninstall \
 	uninstall-am
 
+.PRECIOUS: Makefile
+
 
 upload:
 	rsync -avz @PACKAGE_TARNAME@-@VERSION@.tar.gz doc/html/ www.airspayce.com:public_html/mikem/@PACKAGE_NAME@

aclocal.m4

@@ -1,6 +1,6 @@
-# generated automatically by aclocal 1.13.4 -*- Autoconf -*-
+# generated automatically by aclocal 1.16.5 -*- Autoconf -*-
 
-# Copyright (C) 1996-2013 Free Software Foundation, Inc.
+# Copyright (C) 1996-2021 Free Software Foundation, Inc.
 
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -14,13 +14,13 @@
 m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
-m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.69],,
-[m4_warning([this file was generated for autoconf 2.69.
+m4_if(m4_defn([AC_AUTOCONF_VERSION]), [2.71],,
+[m4_warning([this file was generated for autoconf 2.71.
 You have another version of autoconf.  It may work, but is not guaranteed to.
 If you have problems, you may need to regenerate the build system entirely.
 To do so, use the procedure documented by the package, typically 'autoreconf'.])])
 
-# Copyright (C) 2002-2013 Free Software Foundation, Inc.
+# Copyright (C) 2002-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -32,10 +32,10 @@ To do so, use the procedure documented by the package, typically 'autoreconf'.])
 # generated from the m4 files accompanying Automake X.Y.
 # (This private macro should not be called outside this file.)
 AC_DEFUN([AM_AUTOMAKE_VERSION],
-[am__api_version='1.13'
+[am__api_version='1.16'
 dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
 dnl require some minimum version.  Point them to the right macro.
-m4_if([$1], [1.13.4], [],
+m4_if([$1], [1.16.5], [],
       [AC_FATAL([Do not call $0, use AM_INIT_AUTOMAKE([$1]).])])dnl
 ])
 
@@ -51,14 +51,14 @@ m4_define([_AM_AUTOCONF_VERSION], [])
 # Call AM_AUTOMAKE_VERSION and AM_AUTOMAKE_VERSION so they can be traced.
 # This function is AC_REQUIREd by AM_INIT_AUTOMAKE.
 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
-[AM_AUTOMAKE_VERSION([1.13.4])dnl
+[AM_AUTOMAKE_VERSION([1.16.5])dnl
 m4_ifndef([AC_AUTOCONF_VERSION],
   [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])
 
 # AM_AUX_DIR_EXPAND                                         -*- Autoconf -*-
 
-# Copyright (C) 2001-2013 Free Software Foundation, Inc.
+# Copyright (C) 2001-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -103,15 +103,14 @@ _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])
 # configured tree to be moved without reconfiguration.
 
 AC_DEFUN([AM_AUX_DIR_EXPAND],
-[dnl Rely on autoconf to set up CDPATH properly.
-AC_PREREQ([2.50])dnl
-# expand $ac_aux_dir to an absolute path
-am_aux_dir=`cd $ac_aux_dir && pwd`
+[AC_REQUIRE([AC_CONFIG_AUX_DIR_DEFAULT])dnl
+# Expand $ac_aux_dir to an absolute path.
+am_aux_dir=`cd "$ac_aux_dir" && pwd`
 ])
 
 # AM_COND_IF                                            -*- Autoconf -*-
 
-# Copyright (C) 2008-2013 Free Software Foundation, Inc.
+# Copyright (C) 2008-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -148,7 +147,7 @@ fi[]dnl
 
 # AM_CONDITIONAL                                            -*- Autoconf -*-
 
-# Copyright (C) 1997-2013 Free Software Foundation, Inc.
+# Copyright (C) 1997-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -179,7 +178,7 @@ AC_CONFIG_COMMANDS_PRE(
 Usually this means the macro was only invoked conditionally.]])
 fi])])
 
-# Copyright (C) 1999-2013 Free Software Foundation, Inc.
+# Copyright (C) 1999-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -370,13 +369,12 @@ _AM_SUBST_NOTMAKE([am__nodep])dnl
 
 # Generate code to set up dependency tracking.              -*- Autoconf -*-
 
-# Copyright (C) 1999-2013 Free Software Foundation, Inc.
+# Copyright (C) 1999-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
 # with or without modifications, as long as this notice is preserved.
 
-
 # _AM_OUTPUT_DEPENDENCY_COMMANDS
 # ------------------------------
 AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
@@ -384,49 +382,43 @@ AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
   # Older Autoconf quotes --file arguments for eval, but not when files
   # are listed without --file.  Let's play safe and only enable the eval
   # if we detect the quoting.
-  case $CONFIG_FILES in
-  *\'*) eval set x "$CONFIG_FILES" ;;
-  *)   set x $CONFIG_FILES ;;
-  esac
+  # TODO: see whether this extra hack can be removed once we start
+  # requiring Autoconf 2.70 or later.
+  AS_CASE([$CONFIG_FILES],
+          [*\'*], [eval set x "$CONFIG_FILES"],
+          [*], [set x $CONFIG_FILES])
   shift
-  for mf
+  # Used to flag and report bootstrapping failures.
+  am_rc=0
+  for am_mf
   do
     # Strip MF so we end up with the name of the file.
-    mf=`echo "$mf" | sed -e 's/:.*$//'`
-    # Check whether this is an Automake generated Makefile or not.
-    # We used to match only the files named 'Makefile.in', but
-    # some people rename them; so instead we look at the file content.
-    # Grep'ing the first line is not enough: some people post-process
-    # each Makefile.in and add a new line on top of each file to say so.
-    # Grep'ing the whole file is not good either: AIX grep has a line
+    am_mf=`AS_ECHO(["$am_mf"]) | sed -e 's/:.*$//'`
+    # Check whether this is an Automake generated Makefile which includes
+    # dependency-tracking related rules and includes.
+    # Grep'ing the whole file directly is not great: AIX grep has a line
     # limit of 2048, but all sed's we know have understand at least 4000.
-    if sed -n 's,^#.*generated by automake.*,X,p' "$mf" | grep X >/dev/null 2>&1; then
-      dirpart=`AS_DIRNAME("$mf")`
-    else
-      continue
-    fi
-    # Extract the definition of DEPDIR, am__include, and am__quote
-    # from the Makefile without running 'make'.
-    DEPDIR=`sed -n 's/^DEPDIR = //p' < "$mf"`
-    test -z "$DEPDIR" && continue
-    am__include=`sed -n 's/^am__include = //p' < "$mf"`
-    test -z "$am__include" && continue
-    am__quote=`sed -n 's/^am__quote = //p' < "$mf"`
-    # Find all dependency output files, they are included files with
-    # $(DEPDIR) in their names.  We invoke sed twice because it is the
-    # simplest approach to changing $(DEPDIR) to its actual value in the
-    # expansion.
-    for file in `sed -n "
-      s/^$am__include $am__quote\(.*(DEPDIR).*\)$am__quote"'$/\1/p' <"$mf" | \
-	 sed -e 's/\$(DEPDIR)/'"$DEPDIR"'/g'`; do
-      # Make sure the directory exists.
-      test -f "$dirpart/$file" && continue
-      fdir=`AS_DIRNAME(["$file"])`
-      AS_MKDIR_P([$dirpart/$fdir])
-      # echo "creating $dirpart/$file"
-      echo '# dummy' > "$dirpart/$file"
-    done
+    sed -n 's,^am--depfiles:.*,X,p' "$am_mf" | grep X >/dev/null 2>&1 \
+      || continue
+    am_dirpart=`AS_DIRNAME(["$am_mf"])`
+    am_filepart=`AS_BASENAME(["$am_mf"])`
+    AM_RUN_LOG([cd "$am_dirpart" \
+      && sed -e '/# am--include-marker/d' "$am_filepart" \
+        | $MAKE -f - am--depfiles]) || am_rc=$?
   done
+  if test $am_rc -ne 0; then
+    AC_MSG_FAILURE([Something went wrong bootstrapping makefile fragments
+    for automatic dependency tracking.  If GNU make was not used, consider
+    re-running the configure script with MAKE="gmake" (or whatever is
+    necessary).  You can also try re-running configure with the
+    '--disable-dependency-tracking' option to at least be able to build
+    the package (albeit without support for automatic dependency tracking).])
+  fi
+  AS_UNSET([am_dirpart])
+  AS_UNSET([am_filepart])
+  AS_UNSET([am_mf])
+  AS_UNSET([am_rc])
+  rm -f conftest-deps.mk
 }
 ])# _AM_OUTPUT_DEPENDENCY_COMMANDS
 
@@ -435,18 +427,17 @@ AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
 # -----------------------------
 # This macro should only be invoked once -- use via AC_REQUIRE.
 #
-# This code is only required when automatic dependency tracking
-# is enabled.  FIXME.  This creates each '.P' file that we will
-# need in order to bootstrap the dependency handling code.
+# This code is only required when automatic dependency tracking is enabled.
+# This creates each '.Po' and '.Plo' makefile fragment that we'll need in
+# order to bootstrap the dependency handling code.
 AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
 [AC_CONFIG_COMMANDS([depfiles],
      [test x"$AMDEP_TRUE" != x"" || _AM_OUTPUT_DEPENDENCY_COMMANDS],
-     [AMDEP_TRUE="$AMDEP_TRUE" ac_aux_dir="$ac_aux_dir"])
-])
+     [AMDEP_TRUE="$AMDEP_TRUE" MAKE="${MAKE-make}"])])
 
 # Do all the work for Automake.                             -*- Autoconf -*-
 
-# Copyright (C) 1996-2013 Free Software Foundation, Inc.
+# Copyright (C) 1996-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -455,6 +446,12 @@ AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
 # This macro actually does too much.  Some checks are only needed if
 # your package does certain things.  But this isn't really a big deal.
 
+dnl Redefine AC_PROG_CC to automatically invoke _AM_PROG_CC_C_O.
+m4_define([AC_PROG_CC],
+m4_defn([AC_PROG_CC])
+[_AM_PROG_CC_C_O
+])
+
 # AM_INIT_AUTOMAKE(PACKAGE, VERSION, [NO-DEFINE])
 # AM_INIT_AUTOMAKE([OPTIONS])
 # -----------------------------------------------
@@ -468,6 +465,10 @@ AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
 # release and drop the old call support.
 AC_DEFUN([AM_INIT_AUTOMAKE],
 [AC_PREREQ([2.65])dnl
+m4_ifdef([_$0_ALREADY_INIT],
+  [m4_fatal([$0 expanded multiple times
+]m4_defn([_$0_ALREADY_INIT]))],
+  [m4_define([_$0_ALREADY_INIT], m4_expansion_stack)])dnl
 dnl Autoconf wants to disallow AM_ names.  We explicitly allow
 dnl the ones we care about.
 m4_pattern_allow([^AM_[A-Z]+FLAGS$])dnl
@@ -504,7 +505,7 @@ m4_ifval([$3], [_AM_SET_OPTION([no-define])])dnl
 [_AM_SET_OPTIONS([$1])dnl
 dnl Diagnose old-style AC_INIT with new-style AM_AUTOMAKE_INIT.
 m4_if(
-  m4_ifdef([AC_PACKAGE_NAME], [ok]):m4_ifdef([AC_PACKAGE_VERSION], [ok]),
+  m4_ifset([AC_PACKAGE_NAME], [ok]):m4_ifset([AC_PACKAGE_VERSION], [ok]),
   [ok:ok],,
   [m4_fatal([AC_INIT should be called with package and version arguments])])dnl
  AC_SUBST([PACKAGE], ['AC_PACKAGE_TARNAME'])dnl
@@ -527,11 +528,11 @@ AC_REQUIRE([AM_PROG_INSTALL_STRIP])dnl
 AC_REQUIRE([AC_PROG_MKDIR_P])dnl
 # For better backward compatibility.  To be removed once Automake 1.9.x
 # dies out for good.  For more background, see:
-# <http://lists.gnu.org/archive/html/automake/2012-07/msg00001.html>
-# <http://lists.gnu.org/archive/html/automake/2012-07/msg00014.html>
+# <https://lists.gnu.org/archive/html/automake/2012-07/msg00001.html>
+# <https://lists.gnu.org/archive/html/automake/2012-07/msg00014.html>
 AC_SUBST([mkdir_p], ['$(MKDIR_P)'])
-# We need awk for the "check" target.  The system "awk" is bad on
-# some platforms.
+# We need awk for the "check" target (and possibly the TAP driver).  The
+# system "awk" is bad on some platforms.
 AC_REQUIRE([AC_PROG_AWK])dnl
 AC_REQUIRE([AC_PROG_MAKE_SET])dnl
 AC_REQUIRE([AM_SET_LEADING_DOT])dnl
@@ -556,6 +557,20 @@ AC_PROVIDE_IFELSE([AC_PROG_OBJCXX],
 		  [m4_define([AC_PROG_OBJCXX],
 			     m4_defn([AC_PROG_OBJCXX])[_AM_DEPENDENCIES([OBJCXX])])])dnl
 ])
+# Variables for tags utilities; see am/tags.am
+if test -z "$CTAGS"; then
+  CTAGS=ctags
+fi
+AC_SUBST([CTAGS])
+if test -z "$ETAGS"; then
+  ETAGS=etags
+fi
+AC_SUBST([ETAGS])
+if test -z "$CSCOPE"; then
+  CSCOPE=cscope
+fi
+AC_SUBST([CSCOPE])
+
 AC_REQUIRE([AM_SILENT_RULES])dnl
 dnl The testsuite driver may need to know about EXEEXT, so add the
 dnl 'am__EXEEXT' conditional if _AM_COMPILER_EXEEXT was seen.  This
@@ -563,6 +578,51 @@ dnl macro is hooked onto _AC_COMPILER_EXEEXT early, see below.
 AC_CONFIG_COMMANDS_PRE(dnl
 [m4_provide_if([_AM_COMPILER_EXEEXT],
   [AM_CONDITIONAL([am__EXEEXT], [test -n "$EXEEXT"])])])dnl
+
+# POSIX will say in a future version that running "rm -f" with no argument
+# is OK; and we want to be able to make that assumption in our Makefile
+# recipes.  So use an aggressive probe to check that the usage we want is
+# actually supported "in the wild" to an acceptable degree.
+# See automake bug#10828.
+# To make any issue more visible, cause the running configure to be aborted
+# by default if the 'rm' program in use doesn't match our expectations; the
+# user can still override this though.
+if rm -f && rm -fr && rm -rf; then : OK; else
+  cat >&2 <<'END'
+Oops!
+
+Your 'rm' program seems unable to run without file operands specified
+on the command line, even when the '-f' option is present.  This is contrary
+to the behaviour of most rm programs out there, and not conforming with
+the upcoming POSIX standard: <http://austingroupbugs.net/view.php?id=542>
+
+Please tell bug-automake@gnu.org about your system, including the value
+of your $PATH and any error possibly output before this message.  This
+can help us improve future automake versions.
+
+END
+  if test x"$ACCEPT_INFERIOR_RM_PROGRAM" = x"yes"; then
+    echo 'Configuration will proceed anyway, since you have set the' >&2
+    echo 'ACCEPT_INFERIOR_RM_PROGRAM variable to "yes"' >&2
+    echo >&2
+  else
+    cat >&2 <<'END'
+Aborting the configuration process, to ensure you take notice of the issue.
+
+You can download and install GNU coreutils to get an 'rm' implementation
+that behaves properly: <https://www.gnu.org/software/coreutils/>.
+
+If you want to complete the configuration process using your problematic
+'rm' anyway, export the environment variable ACCEPT_INFERIOR_RM_PROGRAM
+to "yes", and re-run configure.
+
+END
+    AC_MSG_ERROR([Your 'rm' program is bad, sorry.])
+  fi
+fi
+dnl The trailing newline in this macro's definition is deliberate, for
+dnl backward compatibility and to allow trailing 'dnl'-style comments
+dnl after the AM_INIT_AUTOMAKE invocation. See automake bug#16841.
 ])
 
 dnl Hook into '_AC_COMPILER_EXEEXT' early to learn its expansion.  Do not
@@ -571,7 +631,6 @@ dnl mangled by Autoconf and run in a shell conditional statement.
 m4_define([_AC_COMPILER_EXEEXT],
 m4_defn([_AC_COMPILER_EXEEXT])[m4_provide([_AM_COMPILER_EXEEXT])])
 
-
 # When config.status generates a header, we must update the stamp-h file.
 # This file resides in the same directory as the config header
 # that is generated.  The stamp files are numbered to have different names.
@@ -593,7 +652,7 @@ for _am_header in $config_headers :; do
 done
 echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_count])
 
-# Copyright (C) 2001-2013 Free Software Foundation, Inc.
+# Copyright (C) 2001-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -604,7 +663,7 @@ echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_co
 # Define $install_sh.
 AC_DEFUN([AM_PROG_INSTALL_SH],
 [AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
-if test x"${install_sh}" != xset; then
+if test x"${install_sh+set}" != xset; then
   case $am_aux_dir in
   *\ * | *\	*)
     install_sh="\${SHELL} '$am_aux_dir/install-sh'" ;;
@@ -614,7 +673,7 @@ if test x"${install_sh}" != xset; then
 fi
 AC_SUBST([install_sh])])
 
-# Copyright (C) 2003-2013 Free Software Foundation, Inc.
+# Copyright (C) 2003-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -635,7 +694,7 @@ AC_SUBST([am__leading_dot])])
 
 # Check to see how 'make' treats includes.	            -*- Autoconf -*-
 
-# Copyright (C) 2001-2013 Free Software Foundation, Inc.
+# Copyright (C) 2001-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -643,49 +702,42 @@ AC_SUBST([am__leading_dot])])
 
 # AM_MAKE_INCLUDE()
 # -----------------
-# Check to see how make treats includes.
+# Check whether make has an 'include' directive that can support all
+# the idioms we need for our automatic dependency tracking code.
 AC_DEFUN([AM_MAKE_INCLUDE],
-[am_make=${MAKE-make}
-cat > confinc << 'END'
+[AC_MSG_CHECKING([whether ${MAKE-make} supports the include directive])
+cat > confinc.mk << 'END'
 am__doit:
-	@echo this is the am__doit target
+	@echo this is the am__doit target >confinc.out
 .PHONY: am__doit
 END
-# If we don't find an include directive, just comment out the code.
-AC_MSG_CHECKING([for style of include used by $am_make])
 am__include="#"
 am__quote=
-_am_result=none
-# First try GNU make style include.
-echo "include confinc" > confmf
-# Ignore all kinds of additional output from 'make'.
-case `$am_make -s -f confmf 2> /dev/null` in #(
-*the\ am__doit\ target*)
-  am__include=include
-  am__quote=
-  _am_result=GNU
-  ;;
-esac
-# Now try BSD make style include.
-if test "$am__include" = "#"; then
-   echo '.include "confinc"' > confmf
-   case `$am_make -s -f confmf 2> /dev/null` in #(
-   *the\ am__doit\ target*)
-     am__include=.include
-     am__quote="\""
-     _am_result=BSD
-     ;;
-   esac
-fi
-AC_SUBST([am__include])
-AC_SUBST([am__quote])
-AC_MSG_RESULT([$_am_result])
-rm -f confinc confmf
-])
+# BSD make does it like this.
+echo '.include "confinc.mk" # ignored' > confmf.BSD
+# Other make implementations (GNU, Solaris 10, AIX) do it like this.
+echo 'include confinc.mk # ignored' > confmf.GNU
+_am_result=no
+for s in GNU BSD; do
+  AM_RUN_LOG([${MAKE-make} -f confmf.$s && cat confinc.out])
+  AS_CASE([$?:`cat confinc.out 2>/dev/null`],
+      ['0:this is the am__doit target'],
+      [AS_CASE([$s],
+          [BSD], [am__include='.include' am__quote='"'],
+          [am__include='include' am__quote=''])])
+  if test "$am__include" != "#"; then
+    _am_result="yes ($s style)"
+    break
+  fi
+done
+rm -f confinc.* confmf.*
+AC_MSG_RESULT([${_am_result}])
+AC_SUBST([am__include])])
+AC_SUBST([am__quote])])
 
 # Fake the existence of programs that GNU maintainers use.  -*- Autoconf -*-
 
-# Copyright (C) 1997-2013 Free Software Foundation, Inc.
+# Copyright (C) 1997-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -706,12 +758,7 @@ AC_DEFUN([AM_MISSING_HAS_RUN],
 [AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
 AC_REQUIRE_AUX_FILE([missing])dnl
 if test x"${MISSING+set}" != xset; then
-  case $am_aux_dir in
-  *\ * | *\	*)
-    MISSING="\${SHELL} \"$am_aux_dir/missing\"" ;;
-  *)
-    MISSING="\${SHELL} $am_aux_dir/missing" ;;
-  esac
+  MISSING="\${SHELL} '$am_aux_dir/missing'"
 fi
 # Use eval to expand $SHELL
 if eval "$MISSING --is-lightweight"; then
@@ -722,38 +769,9 @@ else
 fi
 ])
 
-#  -*- Autoconf -*-
-# Obsolete and "removed" macros, that must however still report explicit
-# error messages when used, to smooth transition.
-#
-# Copyright (C) 1996-2013 Free Software Foundation, Inc.
-#
-# This file is free software; the Free Software Foundation
-# gives unlimited permission to copy and/or distribute it,
-# with or without modifications, as long as this notice is preserved.
-
-AC_DEFUN([AM_CONFIG_HEADER],
-[AC_DIAGNOSE([obsolete],
-['$0': this macro is obsolete.
-You should use the 'AC][_CONFIG_HEADERS' macro instead.])dnl
-AC_CONFIG_HEADERS($@)])
-
-AC_DEFUN([AM_PROG_CC_STDC],
-[AC_PROG_CC
-am_cv_prog_cc_stdc=$ac_cv_prog_cc_stdc
-AC_DIAGNOSE([obsolete],
-['$0': this macro is obsolete.
-You should simply use the 'AC][_PROG_CC' macro instead.
-Also, your code should no longer depend upon 'am_cv_prog_cc_stdc',
-but upon 'ac_cv_prog_cc_stdc'.])])
-
-AC_DEFUN([AM_C_PROTOTYPES],
-         [AC_FATAL([automatic de-ANSI-fication support has been removed])])
-AU_DEFUN([fp_C_PROTOTYPES], [AM_C_PROTOTYPES])
-
 # Helper functions for option handling.                     -*- Autoconf -*-
 
-# Copyright (C) 2001-2013 Free Software Foundation, Inc.
+# Copyright (C) 2001-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -782,9 +800,73 @@ AC_DEFUN([_AM_SET_OPTIONS],
 AC_DEFUN([_AM_IF_OPTION],
 [m4_ifset(_AM_MANGLE_OPTION([$1]), [$2], [$3])])
 
+# Copyright (C) 1999-2021 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# _AM_PROG_CC_C_O
+# ---------------
+# Like AC_PROG_CC_C_O, but changed for automake.  We rewrite AC_PROG_CC
+# to automatically call this.
+AC_DEFUN([_AM_PROG_CC_C_O],
+[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
+AC_REQUIRE_AUX_FILE([compile])dnl
+AC_LANG_PUSH([C])dnl
+AC_CACHE_CHECK(
+  [whether $CC understands -c and -o together],
+  [am_cv_prog_cc_c_o],
+  [AC_LANG_CONFTEST([AC_LANG_PROGRAM([])])
+  # Make sure it works both with $CC and with simple cc.
+  # Following AC_PROG_CC_C_O, we do the test twice because some
+  # compilers refuse to overwrite an existing .o file with -o,
+  # though they will create one.
+  am_cv_prog_cc_c_o=yes
+  for am_i in 1 2; do
+    if AM_RUN_LOG([$CC -c conftest.$ac_ext -o conftest2.$ac_objext]) \
+         && test -f conftest2.$ac_objext; then
+      : OK
+    else
+      am_cv_prog_cc_c_o=no
+      break
+    fi
+  done
+  rm -f core conftest*
+  unset am_i])
+if test "$am_cv_prog_cc_c_o" != yes; then
+   # Losing compiler, so override with the script.
+   # FIXME: It is wrong to rewrite CC.
+   # But if we don't then we get into trouble of one sort or another.
+   # A longer-term fix would be to have automake use am__CC in this case,
+   # and then we could set am__CC="\$(top_srcdir)/compile \$(CC)"
+   CC="$am_aux_dir/compile $CC"
+fi
+AC_LANG_POP([C])])
+
+# For backward compatibility.
+AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])
+
+# Copyright (C) 2001-2021 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# AM_RUN_LOG(COMMAND)
+# -------------------
+# Run COMMAND, save the exit status in ac_status, and log it.
+# (This has been adapted from Autoconf's _AC_RUN_LOG macro.)
+AC_DEFUN([AM_RUN_LOG],
+[{ echo "$as_me:$LINENO: $1" >&AS_MESSAGE_LOG_FD
+   ($1) >&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD
+   ac_status=$?
+   echo "$as_me:$LINENO: \$? = $ac_status" >&AS_MESSAGE_LOG_FD
+   (exit $ac_status); }])
+
 # Check to make sure that the build environment is sane.    -*- Autoconf -*-
 
-# Copyright (C) 1996-2013 Free Software Foundation, Inc.
+# Copyright (C) 1996-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -865,7 +947,7 @@ AC_CONFIG_COMMANDS_PRE(
 rm -f conftest.file
 ])
 
-# Copyright (C) 2009-2013 Free Software Foundation, Inc.
+# Copyright (C) 2009-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -925,7 +1007,7 @@ AC_SUBST([AM_BACKSLASH])dnl
 _AM_SUBST_NOTMAKE([AM_BACKSLASH])dnl
 ])
 
-# Copyright (C) 2001-2013 Free Software Foundation, Inc.
+# Copyright (C) 2001-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -953,7 +1035,7 @@ fi
 INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
 AC_SUBST([INSTALL_STRIP_PROGRAM])])
 
-# Copyright (C) 2006-2013 Free Software Foundation, Inc.
+# Copyright (C) 2006-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -972,7 +1054,7 @@ AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
 
 # Check how to create a tarball.                            -*- Autoconf -*-
 
-# Copyright (C) 2004-2013 Free Software Foundation, Inc.
+# Copyright (C) 2004-2021 Free Software Foundation, Inc.
 #
 # This file is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,

compile

@@ -0,0 +1,348 @@
+#! /bin/sh
+# Wrapper for compilers which do not understand '-c -o'.
+
+scriptversion=2018-03-07.03; # UTC
+
+# Copyright (C) 1999-2021 Free Software Foundation, Inc.
+# Written by Tom Tromey <tromey@cygnus.com>.
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2, or (at your option)
+# any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# As a special exception to the GNU General Public License, if you
+# distribute this file as part of a program that contains a
+# configuration script generated by Autoconf, you may include it under
+# the same distribution terms that you use for the rest of that program.
+
+# This file is maintained in Automake, please report
+# bugs to <bug-automake@gnu.org> or send patches to
+# <automake-patches@gnu.org>.
+
+nl='
+'
+
+# We need space, tab and new line, in precisely that order.  Quoting is
+# there to prevent tools from complaining about whitespace usage.
+IFS=" ""	$nl"
+
+file_conv=
+
+# func_file_conv build_file lazy
+# Convert a $build file to $host form and store it in $file
+# Currently only supports Windows hosts. If the determined conversion
+# type is listed in (the comma separated) LAZY, no conversion will
+# take place.
+func_file_conv ()
+{
+  file=$1
+  case $file in
+    / | /[!/]*) # absolute file, and not a UNC file
+      if test -z "$file_conv"; then
+	# lazily determine how to convert abs files
+	case `uname -s` in
+	  MINGW*)
+	    file_conv=mingw
+	    ;;
+	  CYGWIN* | MSYS*)
+	    file_conv=cygwin
+	    ;;
+	  *)
+	    file_conv=wine
+	    ;;
+	esac
+      fi
+      case $file_conv/,$2, in
+	*,$file_conv,*)
+	  ;;
+	mingw/*)
+	  file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
+	  ;;
+	cygwin/* | msys/*)
+	  file=`cygpath -m "$file" || echo "$file"`
+	  ;;
+	wine/*)
+	  file=`winepath -w "$file" || echo "$file"`
+	  ;;
+      esac
+      ;;
+  esac
+}
+
+# func_cl_dashL linkdir
+# Make cl look for libraries in LINKDIR
+func_cl_dashL ()
+{
+  func_file_conv "$1"
+  if test -z "$lib_path"; then
+    lib_path=$file
+  else
+    lib_path="$lib_path;$file"
+  fi
+  linker_opts="$linker_opts -LIBPATH:$file"
+}
+
+# func_cl_dashl library
+# Do a library search-path lookup for cl
+func_cl_dashl ()
+{
+  lib=$1
+  found=no
+  save_IFS=$IFS
+  IFS=';'
+  for dir in $lib_path $LIB
+  do
+    IFS=$save_IFS
+    if $shared && test -f "$dir/$lib.dll.lib"; then
+      found=yes
+      lib=$dir/$lib.dll.lib
+      break
+    fi
+    if test -f "$dir/$lib.lib"; then
+      found=yes
+      lib=$dir/$lib.lib
+      break
+    fi
+    if test -f "$dir/lib$lib.a"; then
+      found=yes
+      lib=$dir/lib$lib.a
+      break
+    fi
+  done
+  IFS=$save_IFS
+
+  if test "$found" != yes; then
+    lib=$lib.lib
+  fi
+}
+
+# func_cl_wrapper cl arg...
+# Adjust compile command to suit cl
+func_cl_wrapper ()
+{
+  # Assume a capable shell
+  lib_path=
+  shared=:
+  linker_opts=
+  for arg
+  do
+    if test -n "$eat"; then
+      eat=
+    else
+      case $1 in
+	-o)
+	  # configure might choose to run compile as 'compile cc -o foo foo.c'.
+	  eat=1
+	  case $2 in
+	    *.o | *.[oO][bB][jJ])
+	      func_file_conv "$2"
+	      set x "$@" -Fo"$file"
+	      shift
+	      ;;
+	    *)
+	      func_file_conv "$2"
+	      set x "$@" -Fe"$file"
+	      shift
+	      ;;
+	  esac
+	  ;;
+	-I)
+	  eat=1
+	  func_file_conv "$2" mingw
+	  set x "$@" -I"$file"
+	  shift
+	  ;;
+	-I*)
+	  func_file_conv "${1#-I}" mingw
+	  set x "$@" -I"$file"
+	  shift
+	  ;;
+	-l)
+	  eat=1
+	  func_cl_dashl "$2"
+	  set x "$@" "$lib"
+	  shift
+	  ;;
+	-l*)
+	  func_cl_dashl "${1#-l}"
+	  set x "$@" "$lib"
+	  shift
+	  ;;
+	-L)
+	  eat=1
+	  func_cl_dashL "$2"
+	  ;;
+	-L*)
+	  func_cl_dashL "${1#-L}"
+	  ;;
+	-static)
+	  shared=false
+	  ;;
+	-Wl,*)
+	  arg=${1#-Wl,}
+	  save_ifs="$IFS"; IFS=','
+	  for flag in $arg; do
+	    IFS="$save_ifs"
+	    linker_opts="$linker_opts $flag"
+	  done
+	  IFS="$save_ifs"
+	  ;;
+	-Xlinker)
+	  eat=1
+	  linker_opts="$linker_opts $2"
+	  ;;
+	-*)
+	  set x "$@" "$1"
+	  shift
+	  ;;
+	*.cc | *.CC | *.cxx | *.CXX | *.[cC]++)
+	  func_file_conv "$1"
+	  set x "$@" -Tp"$file"
+	  shift
+	  ;;
+	*.c | *.cpp | *.CPP | *.lib | *.LIB | *.Lib | *.OBJ | *.obj | *.[oO])
+	  func_file_conv "$1" mingw
+	  set x "$@" "$file"
+	  shift
+	  ;;
+	*)
+	  set x "$@" "$1"
+	  shift
+	  ;;
+      esac
+    fi
+    shift
+  done
+  if test -n "$linker_opts"; then
+    linker_opts="-link$linker_opts"
+  fi
+  exec "$@" $linker_opts
+  exit 1
+}
+
+eat=
+
+case $1 in
+  '')
+     echo "$0: No command.  Try '$0 --help' for more information." 1>&2
+     exit 1;
+     ;;
+  -h | --h*)
+    cat <<\EOF
+Usage: compile [--help] [--version] PROGRAM [ARGS]
+
+Wrapper for compilers which do not understand '-c -o'.
+Remove '-o dest.o' from ARGS, run PROGRAM with the remaining
+arguments, and rename the output as expected.
+
+If you are trying to build a whole package this is not the
+right script to run: please start by reading the file 'INSTALL'.
+
+Report bugs to <bug-automake@gnu.org>.
+EOF
+    exit $?
+    ;;
+  -v | --v*)
+    echo "compile $scriptversion"
+    exit $?
+    ;;
+  cl | *[/\\]cl | cl.exe | *[/\\]cl.exe | \
+  icl | *[/\\]icl | icl.exe | *[/\\]icl.exe )
+    func_cl_wrapper "$@"      # Doesn't return...
+    ;;
+esac
+
+ofile=
+cfile=
+
+for arg
+do
+  if test -n "$eat"; then
+    eat=
+  else
+    case $1 in
+      -o)
+	# configure might choose to run compile as 'compile cc -o foo foo.c'.
+	# So we strip '-o arg' only if arg is an object.
+	eat=1
+	case $2 in
+	  *.o | *.obj)
+	    ofile=$2
+	    ;;
+	  *)
+	    set x "$@" -o "$2"
+	    shift
+	    ;;
+	esac
+	;;
+      *.c)
+	cfile=$1
+	set x "$@" "$1"
+	shift
+	;;
+      *)
+	set x "$@" "$1"
+	shift
+	;;
+    esac
+  fi
+  shift
+done
+
+if test -z "$ofile" || test -z "$cfile"; then
+  # If no '-o' option was seen then we might have been invoked from a
+  # pattern rule where we don't need one.  That is ok -- this is a
+  # normal compilation that the losing compiler can handle.  If no
+  # '.c' file was seen then we are probably linking.  That is also
+  # ok.
+  exec "$@"
+fi
+
+# Name of file we expect compiler to create.
+cofile=`echo "$cfile" | sed 's|^.*[\\/]||; s|^[a-zA-Z]:||; s/\.c$/.o/'`
+
+# Create the lock directory.
+# Note: use '[/\\:.-]' here to ensure that we don't use the same name
+# that we are using for the .o file.  Also, base the name on the expected
+# object file name, since that is what matters with a parallel build.
+lockdir=`echo "$cofile" | sed -e 's|[/\\:.-]|_|g'`.d
+while true; do
+  if mkdir "$lockdir" >/dev/null 2>&1; then
+    break
+  fi
+  sleep 1
+done
+# FIXME: race condition here if user kills between mkdir and trap.
+trap "rmdir '$lockdir'; exit 1" 1 2 15
+
+# Run the compile.
+"$@"
+ret=$?
+
+if test -f "$cofile"; then
+  test "$cofile" = "$ofile" || mv "$cofile" "$ofile"
+elif test -f "${cofile}bj"; then
+  test "${cofile}bj" = "$ofile" || mv "${cofile}bj" "$ofile"
+fi
+
+rmdir "$lockdir"
+exit $ret
+
+# Local Variables:
+# mode: shell-script
+# sh-indentation: 2
+# eval: (add-hook 'before-save-hook 'time-stamp)
+# time-stamp-start: "scriptversion="
+# time-stamp-format: "%:y-%02m-%02d.%02H"
+# time-stamp-time-zone: "UTC0"
+# time-stamp-end: "; # UTC"
+# End:

configure.ac

@@ -6,18 +6,28 @@ dnl (C) 2012 Mike McCauley (mikem@airspayce.com)
 
 dnl Dont forget to update  BCM2835_VERSION and .tar.gz in bcm2835.h
 dnl and the zip file.
-AC_INIT([bcm2835], [1.50], [mikem@airspayce.com])
+AC_INIT([bcm2835], [1.75], [mikem@airspayce.com])
 
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h:config.h.in)
 AM_INIT_AUTOMAKE()
 AC_CHECK_LIB([rt], [clock_gettime])
-AC_CHECK_PROGS([DOXYGEN], [doxygen])
-if test -z "$DOXYGEN";
-   then AC_MSG_WARN([Doxygen not found - continuing without Doxygen support])
+AC_MSG_CHECKING([for docs])
+AC_ARG_WITH([docs],
+   [AS_HELP_STRING([--with-docs], [generate doxygen docs (default yes)])],
+   [with_docs=$withval],
+   [with_docs=yes])
+AC_MSG_RESULT([$with_docs])
+AM_CONDITIONAL([HAVE_DOCS], [test "x$with_docs" = "xyes"])
+if test "x$with_docs" = "xyes" ; then
+   AC_CHECK_PROGS([DOXYGEN], [doxygen])
+   if test -z "$DOXYGEN";
+      then AC_MSG_WARN([Doxygen not found - continuing without Doxygen support])
+   fi
 fi
 AC_PROG_RANLIB
 AC_PROG_CC
 AC_CONFIG_MACRO_DIR([m4])
 AM_CONDITIONAL([HAVE_DOXYGEN], [test -n "$DOXYGEN"])
 AM_COND_IF([HAVE_DOXYGEN], [AC_CONFIG_FILES([doc/Doxyfile])])
-AC_OUTPUT(Makefile src/Makefile doc/Makefile)
+AC_CONFIG_FILES(Makefile src/Makefile doc/Makefile)
+AC_OUTPUT

doc/Makefile.in

@@ -1,7 +1,7 @@
-# Makefile.in generated by automake 1.13.4 from Makefile.am.
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -14,7 +14,17 @@
 
 @SET_MAKE@
 VPATH = @srcdir@
-am__is_gnu_make = test -n '$(MAKEFILE_LIST)' && test -n '$(MAKELEVEL)'
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
 am__make_running_with_option = \
   case $${target_option-} in \
       ?) ;; \
@@ -76,12 +86,11 @@ NORMAL_UNINSTALL = :
 PRE_UNINSTALL = :
 POST_UNINSTALL = :
 subdir = doc
-DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
-	$(srcdir)/Doxyfile.in
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(am__DIST_COMMON)
 mkinstalldirs = $(install_sh) -d
 CONFIG_HEADER = $(top_builddir)/config.h
 CONFIG_CLEAN_FILES = Doxyfile
@@ -106,6 +115,7 @@ am__can_run_installinfo = \
     *) (install-info --version) >/dev/null 2>&1;; \
   esac
 am__tagged_files = $(HEADERS) $(SOURCES) $(TAGS_FILES) $(LISP)
+am__DIST_COMMON = $(srcdir)/Doxyfile.in $(srcdir)/Makefile.in
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 ACLOCAL = @ACLOCAL@
 AMTAR = @AMTAR@
@@ -118,6 +128,8 @@ CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPPFLAGS = @CPPFLAGS@
+CSCOPE = @CSCOPE@
+CTAGS = @CTAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
@@ -125,6 +137,7 @@ DOXYGEN = @DOXYGEN@
 ECHO_C = @ECHO_C@
 ECHO_N = @ECHO_N@
 ECHO_T = @ECHO_T@
+ETAGS = @ETAGS@
 EXEEXT = @EXEEXT@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
@@ -185,6 +198,7 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
+runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -209,14 +223,13 @@ $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu doc/Makefile'; \
 	$(am__cd) $(top_srcdir) && \
 	  $(AUTOMAKE) --gnu doc/Makefile
-.PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
 	  *config.status*) \
 	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
 	  *) \
-	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
-	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
 	esac;
 
 $(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
@@ -235,8 +248,10 @@ ctags CTAGS:
 
 cscope cscopelist:
 
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
 
-distdir: $(DISTFILES)
+distdir-am: $(DISTFILES)
 	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
 	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
 	list='$(DISTFILES)'; \
@@ -383,6 +398,8 @@ uninstall-am:
 	mostlyclean-generic pdf pdf-am ps ps-am tags-am uninstall \
 	uninstall-am
 
+.PRECIOUS: Makefile
+
 
 @HAVE_DOXYGEN_TRUE@doxyfile.stamp: ../src/bcm2835.h
 @HAVE_DOXYGEN_TRUE@	$(DOXYGEN) Doxyfile

examples/pwm/pwm.c

@@ -12,6 +12,8 @@
 // gcc -o pwm -I ../../src ../../src/bcm2835.c pwm.c
 // sudo ./pwm
 //
+// Connect an LED between GPIO18 (pin 12) and GND to observe the LED changing in brightness
+//
 // Author: Mike McCauley
 // Copyright (C) 2013 Mike McCauley
 // $Id: RF22.h,v 1.21 2012/05/30 01:51:25 mikem Exp $
@@ -45,18 +47,19 @@ int main(int argc, char **argv)
     bcm2835_pwm_set_range(PWM_CHANNEL, RANGE);
 
     // Vary the PWM m/s ratio between 1/RANGE and (RANGE-1)/RANGE
-    int direction = 1;
+    // over the course of a a few seconds
+    int direction = 1; // 1 is increase, -1 is decrease
     int data = 1;
     while (1)
-      {
+    {
 	if (data == 1)
-	  direction = 1;
+	    direction = 1;   // Switch to increasing
 	else if (data == RANGE-1)
-	  direction = -1;
+	    direction = -1;  // Switch to decreasing
 	data += direction;
-	  bcm2835_pwm_set_data(PWM_CHANNEL, data);
-	bcm2835_delay(50);
-      }
+	bcm2835_pwm_set_data(PWM_CHANNEL, data);
+	bcm2835_delay(1);
+    }
 
     bcm2835_close();
     return 0;

examples/smi/smi.c

@@ -0,0 +1,82 @@
+// smi.c
+//
+// Example program for bcm2835 library
+// Shows how to send and receive a byte over SMI bus
+//
+// A CodeBlocks project is provided for easier tests
+//
+// After installing bcm2835, you can build this 
+// with something like:
+// gcc -o smi smi.c -l bcm2835
+// sudo ./smi
+//
+// Or you can test it before installing with:
+// gcc -o smi -I ../../src ../../src/bcm2835.c smi.c
+// sudo ./smi
+//
+// This test program must be run with root rights !!
+// From terminal, use sudo ./smi
+//
+// Author: Benoit BOUCHEZ (BEB)
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "bcm2835.h"
+
+#define SMI_CHANNEL     0
+
+// Number of SMI clock cycles for each SMI transaction phase
+#define SMI_SETUP_CLOCKS    10      // setup time = 80ns
+#define SMI_STROBE_CLOCKS   20      // strobe time = 160ns
+#define SMI_HOLD_CLOCKS     20      // hold time = 160ns
+#define SMI_PACE_CLOCKS     1       // pace time = 8ns
+
+int main(int argc, char **argv)
+{
+    int Address=0;
+    int WriteData;
+    uint8_t ReadData[16];
+
+    if (!bcm2835_init())
+    {
+        printf("bcm2835_init() failed. Are you running as root??\n");
+        return 1;
+    }
+
+    if (!bcm2835_smi_begin())
+    {
+        printf("bcm2835_smi_begin() failed. Are you running as root??\n");
+        return 1;
+    }
+
+    // The following test sequence writes 4096 bytes and reads 16 bytes
+    // With default timing parameters, the complete sequence takes 4.6ms
+    // on a RPi 3B (with O3 optimization), giving a transfer speed of 894kB/s
+    // A SPI interface would require a 7MHz clock to achieve the same results...
+
+    // Change SMI timing parameters for writing
+    bcm2835_smi_set_timing (SMI_CHANNEL, 0, SMI_SETUP_CLOCKS, SMI_STROBE_CLOCKS, SMI_HOLD_CLOCKS, SMI_PACE_CLOCKS);
+    // Change SMI timing parameters for reading
+    bcm2835_smi_set_timing (SMI_CHANNEL, 1, SMI_SETUP_CLOCKS, SMI_STROBE_CLOCKS, SMI_HOLD_CLOCKS, SMI_PACE_CLOCKS);
+
+    // Write a sequence of bytes to each possible address
+    for (Address=0; Address<=15; Address++)
+    {
+        for (WriteData=0; WriteData<=255; WriteData++)
+        {
+            bcm2835_smi_write (SMI_CHANNEL, WriteData, Address);
+        }
+    }
+
+    // Read a sequence of bytes at each possible address
+    for (Address=0; Address<=15; Address++)
+    {
+        ReadData[Address] = bcm2835_smi_read (SMI_CHANNEL, Address);
+     }
+
+    // Release GPIO
+    bcm2835_smi_end();
+    bcm2835_close();
+
+    return 0;
+}

examples/spi/spi.c

@@ -33,7 +33,7 @@ int main(int argc, char **argv)
 
     if (!bcm2835_spi_begin())
     {
-      printf("bcm2835_spi_begin failedg. Are you running as root??\n");
+      printf("bcm2835_spi_begin failed. Are you running as root??\n");
       return 1;
     }
     bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST);      // The default

examples/spiram/spiram.c

@@ -0,0 +1,92 @@
+// spiram.c
+//
+// Little library for accessing  SPI RAM such as 23K256-I/P
+// using bcm2835 library on Raspberry Pi
+//
+// Author: Mike McCauley
+// Copyright (C) 2018 Mike McCauley
+// This software is part of the bcm2835 library and is licensed under the same conditions
+// $Id:  $
+
+#include <bcm2835.h>
+#include <string.h> // memcpy
+#include "spiram.h"
+
+static uint8_t _mode = SPIRAM_MODE_INVALID;
+
+uint8_t spiram_read_sr()
+{
+  uint8_t command[] = { SPIRAM_OPCODE_READ_SR, 0};
+  bcm2835_spi_transfern(command, sizeof(command));
+  return command[1];
+}
+
+bool spiram_write_sr(uint8_t value)
+{
+  uint8_t command[] = { SPIRAM_OPCODE_WRITE_SR, value};
+  bcm2835_spi_transfern(command, sizeof(command));
+  return true;
+}
+
+bool spiram_set_mode(uint8_t mode)
+{
+  if (mode != _mode)
+    {
+      spiram_write_sr(mode);
+      _mode = mode;
+    }
+  return true;
+}
+
+bool spiram_begin()
+{
+  _mode = SPIRAM_MODE_BYTE;
+  
+  bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_MSBFIRST);      // The default
+  bcm2835_spi_setDataMode(BCM2835_SPI_MODE0);                   // The default
+  bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_65536); // The default
+  bcm2835_spi_chipSelect(BCM2835_SPI_CS0);                      // The default
+  bcm2835_spi_setChipSelectPolarity(BCM2835_SPI_CS0, LOW);      // the default
+  return true;
+}
+
+bool spiram_end()
+{
+  bcm2835_spi_end();
+  return true;
+}
+
+
+uint8_t spiram_read_byte(uint16_t address)
+{
+  spiram_set_mode(SPIRAM_MODE_BYTE);
+  uint8_t command[] = { SPIRAM_OPCODE_READ, (address >> 8) & 0xff, address & 0xff, 0xff };
+  bcm2835_spi_transfern(command, sizeof(command));
+  uint8_t ret = command[3];
+}
+
+bool spiram_write_byte(uint16_t address, uint8_t value)
+{
+  spiram_set_mode(SPIRAM_MODE_BYTE);
+  uint8_t command[] = { SPIRAM_OPCODE_WRITE, (address >> 8) & 0xff, address & 0xff, value };
+  bcm2835_spi_writenb(command, sizeof(command));
+  return true;
+}
+
+bool spiram_read_page(uint16_t address, uint8_t *buf)
+{
+  spiram_set_mode(SPIRAM_MODE_PAGE);
+  uint8_t command[3 + SPIRAM_PAGE_SIZE] = { SPIRAM_OPCODE_READ, (address >> 8) & 0xff, address & 0xff };
+  bcm2835_spi_transfern(command, sizeof(command));
+  memcpy(buf, command + 3, SPIRAM_PAGE_SIZE);
+  return true;
+}
+
+bool spiram_write_page(uint16_t address, uint8_t *buf)
+{
+  spiram_set_mode(SPIRAM_MODE_PAGE);
+  uint8_t command[3 + SPIRAM_PAGE_SIZE] = { SPIRAM_OPCODE_WRITE, (address >> 8) & 0xff, address & 0xff };
+  memcpy(command + 3, buf, SPIRAM_PAGE_SIZE);;
+  bcm2835_spi_writenb(command, sizeof(command));
+  return true;
+}

examples/spiram/spiram.h

@@ -0,0 +1,102 @@
+// spiram.h
+//
+// Header for a Little Library for accessing SPI RAM chips such as 23K256-I/P
+// using bcm2835 library on Raspberry Pi
+//
+// Author: Mike McCauley
+// Copyright (C) 2018 Mike McCauley
+// This software is part of the bcm2835 library and is licensed under the same conditions
+// $Id:  $
+
+#include <stdbool.h> // bool, true, false
+
+#ifndef SPIRAM_h
+#define SPIRAM_h
+
+#define SPIRAM_HOLD_DISABLE     0x1
+#define SPIRAM_MODE_BYTE       (0x00 | SPIRAM_HOLD_DISABLE)
+#define SPIRAM_MODE_PAGE       (0x80 | SPIRAM_HOLD_DISABLE)
+#define SPIRAM_MODE_STREAM     (0x40 | SPIRAM_HOLD_DISABLE)
+#define SPIRAM_MODE_INVALID    0xff
+#define SPIRAM_OPCODE_READ_SR  0x05
+#define SPIRAM_OPCODE_WRITE_SR 0x01
+#define SPIRAM_OPCODE_READ     0x03
+#define SPIRAM_OPCODE_WRITE    0x02
+
+/* Size of a page in 23K256 */
+#define SPIRAM_PAGE_SIZE       32
+
+/*
+ * This library allows you to read and write data from an external SPI interfaced static ram (SRAM)
+ * such as 23K256 (256kbit = 32kByte)
+ * Byte and POage modes are supported.
+ * Valid addresses are from 0x0000 to 0x7fff
+ * Tested on RPI 3 Model B, Raspbian Jessie
+ */
+
+/*
+ * Initialise the spiram library, enables SPI with default divider of 
+ * BCM2835_SPI_CLOCK_DIVIDER_65536 = 6.1035156kHz on RPI3.
+ * You can change the SPI speed after calling this by calling bcm2835_spi_setClockDivider()
+ * Returns true on success, false otherwise
+ */
+bool spiram_begin();
+
+/*
+ * Stops using the RPI SPI functions and returns the GPIO pins to their default behaviour.
+ * Call this when you have finished using SPI forever, or at the end of your program
+ * Returns true on success, false otherwise
+ */
+bool spiram_end();
+
+/*
+ * Read and returns the current value of the SRAM status register
+ */
+uint8_t spiram_read_sr();
+
+/*
+ * Write a new value to the SRAM status register, 
+ * usually one of SPIRAM_MODE_*
+ * You should never need to call this directly. Used internally.
+ * Returns true on success, false otherwise
+ */
+bool spiram_write_sr(uint8_t value);
+
+/*
+ * Set the operating mode of the SRAM.
+ * Mode is one of  SPIRAM_MODE_*. THis is done automatically 
+ * by the spiram_write_* and spiram_read_* functions, so you would not normally
+ * need to call this directly.
+ * Returns true on success, false otherwise
+ */
+bool spiram_set_mode(uint8_t mode);
+
+/*
+ * Reads a single byte from the given address and returns it.
+ */
+uint8_t spiram_read_byte(uint16_t address);
+
+/*
+ * Writes a single byte to the given address.
+ * Returns true on success, false otherwise
+ */
+bool spiram_write_byte(uint16_t address, uint8_t value);
+
+/*
+ * Reads a whole page of data (32 bytes) from the page starting at the given address.
+ * The read data is placed in buf. Be sure that there is enough rom there for it.
+ * Caution: if the starting address is not on a page boundary, 
+ * it will wrap back to the beginning of the page.
+ * Returns true on success, false otherwise
+ */
+bool spiram_read_page(uint16_t address, uint8_t *buf);
+
+/*
+ * Writes a whole page of data (32 bytes) to the page starting at the given address.
+ * Caution: if the starting address is not on a page boundary, 
+ * it will wrap back to the beginning of the page.
+ * Returns true on success, false otherwise
+ */
+bool spiram_write_page(uint16_t address, uint8_t *buf);
+
+#endif

examples/spiram/spiram_test.c

@@ -0,0 +1,99 @@
+// spiram_test.c
+//
+// Example program for bcm2835 
+// Shows how to interface with SPI RAM such as 23K256-I/P
+// using the spiram little library
+//
+// Tested on RPI 3 Model B, Raspbian Jessie
+// Tested at full speed over many hours with no errors.
+//
+// Connect RPi 3 B to 23K256-I/P like this:
+// RPi pin    Function     23K256-I/P pin (name)
+// J1-6       GND          4 (VSS)
+// J1-1       3.3V         8 (VCC)
+//                    and  7 (/HOLD)
+// J1-19      SPI0_MOSI    5 (SI)
+// J1-21      SPI0_MISO    2 (SO)
+// J1-23      SPI0_SCLK    6 (SCK)
+// J1-24      SPI0_CE0_N   1 (/CS)
+//
+// After installing bcm2835, you can build this
+// with something like:
+// gcc -o spiram_test spiram.c spiram_test.c -l bcm2835
+// sudo ./spiram_test
+//
+// Or you can test it before installing with:
+// gcc -o spiram_test -I ../../src ../../src/bcm2835.c spiram.c spiram_test.c
+// sudo ./spiram_test
+//
+// Author: Mike McCauley
+// Copyright (C) 2018 Mike McCauley
+// $Id:  $
+
+#include <bcm2835.h>
+#include <stdio.h>
+#include <string.h> // memcmp
+#include "spiram.h"
+
+int main(int argc, char **argv)
+{
+  if (!bcm2835_init())
+    {
+      printf("bcm2835_init failed. Are you running as root??\n");
+      return 1;
+    }
+
+  if (!bcm2835_spi_begin())
+    {
+      printf("bcm2835_spi_begin failed. Are you running as root??\n");
+      return 1;
+    }
+  if (!spiram_begin())
+    {
+      printf("spiram_begin failed.\n");
+      return 1;
+    }
+  /* You can speed things up by selecting a faster SPI speed
+  // after spiram_begin, which defaults to BCM2835_SPI_CLOCK_DIVIDER_65536 = 6.1035156kHz on RPI3
+  */
+  bcm2835_spi_setClockDivider(BCM2835_SPI_CLOCK_DIVIDER_64); // 6.25MHz on RPI3
+
+  uint8_t value = 0;
+  uint16_t address = 0x0000;
+  while (1)
+    {
+      uint8_t ret;
+
+      /*      ret = spiram_read_sr();*/
+      spiram_write_byte(address, value);
+      ret = spiram_read_byte(address);
+      if (ret != value)
+	printf("ERROR: spiram_read_byte address %04x got %02x, expected %02x\n", address, ret, value);
+#if 0
+      printf("spiram_read_byte at address %04x got %02x\n", address, ret);
+#endif
+      
+      uint8_t write_page_buf[SPIRAM_PAGE_SIZE] = { 0, value, value, value };
+      uint8_t read_page_buf[SPIRAM_PAGE_SIZE];
+      spiram_write_page(address, write_page_buf);
+    
+      spiram_read_page(address, read_page_buf);
+      if (memcmp(write_page_buf, read_page_buf, SPIRAM_PAGE_SIZE) != 0)
+	printf("ERROR: spiram_read_page at address %04x\n", address);
+#if 0
+      printf("spiram_read_page address %04x got ", address);
+      int i;
+      for (i = 0; i < SPIRAM_PAGE_SIZE; i++)
+	printf("%02x ", read_page_buf[i]);
+      printf("\n");
+#endif
+      /* sleep(1); */
+      value++;
+      address++;
+    }
+  
+  spiram_end();
+  bcm2835_close();
+  return 0;
+}
+

missing

@@ -1,11 +1,10 @@
 #! /bin/sh
-# Common stub for a few missing GNU programs while installing.
+# Common wrapper for a few potentially missing GNU programs.
 
-scriptversion=2009-04-28.21; # UTC
+scriptversion=2012-06-26.16; # UTC
 
-# Copyright (C) 1996, 1997, 1999, 2000, 2002, 2003, 2004, 2005, 2006,
-# 2008, 2009 Free Software Foundation, Inc.
-# Originally by Fran,cois Pinard <pinard@iro.umontreal.ca>, 1996.
+# Copyright (C) 1996-2013 Free Software Foundation, Inc.
+# Originally written by Fran,cois Pinard <pinard@iro.umontreal.ca>, 1996.
 
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -26,69 +25,40 @@ scriptversion=2009-04-28.21; # UTC
 # the same distribution terms that you use for the rest of that program.
 
 if test $# -eq 0; then
-  echo 1>&2 "Try \`$0 --help' for more information"
+  echo 1>&2 "Try '$0 --help' for more information"
   exit 1
 fi
 
-run=:
-sed_output='s/.* --output[ =]\([^ ]*\).*/\1/p'
-sed_minuso='s/.* -o \([^ ]*\).*/\1/p'
-
-# In the cases where this matters, `missing' is being run in the
-# srcdir already.
-if test -f configure.ac; then
-  configure_ac=configure.ac
-else
-  configure_ac=configure.in
-fi
-
-msg="missing on your system"
-
 case $1 in
---run)
-  # Try to run requested program, and just exit if it succeeds.
-  run=
-  shift
-  "$@" && exit 0
-  # Exit code 63 means version mismatch.  This often happens
-  # when the user try to use an ancient version of a tool on
-  # a file that requires a minimum version.  In this case we
-  # we should proceed has if the program had been absent, or
-  # if --run hadn't been passed.
-  if test $? = 63; then
-    run=:
-    msg="probably too old"
-  fi
-  ;;
+
+  --is-lightweight)
+    # Used by our autoconf macros to check whether the available missing
+    # script is modern enough.
+    exit 0
+    ;;
+
+  --run)
+    # Back-compat with the calling convention used by older automake.
+    shift
+    ;;
 
   -h|--h|--he|--hel|--help)
     echo "\
 $0 [OPTION]... PROGRAM [ARGUMENT]...
 
-Handle \`PROGRAM [ARGUMENT]...' for when PROGRAM is missing, or return an
-error status if there is no known handling for PROGRAM.
+Run 'PROGRAM [ARGUMENT]...', returning a proper advice when this fails due
+to PROGRAM being missing or too old.
 
 Options:
   -h, --help      display this help and exit
   -v, --version   output version information and exit
-  --run           try to run the given command, and emulate it if it fails
 
 Supported PROGRAM values:
-  aclocal      touch file \`aclocal.m4'
-  autoconf     touch file \`configure'
-  autoheader   touch file \`config.h.in'
-  autom4te     touch the output file, or create a stub one
-  automake     touch all \`Makefile.in' files
-  bison        create \`y.tab.[ch]', if possible, from existing .[ch]
-  flex         create \`lex.yy.c', if possible, from existing .c
-  help2man     touch the output file
-  lex          create \`lex.yy.c', if possible, from existing .c
-  makeinfo     touch the output file
-  tar          try tar, gnutar, gtar, then tar without non-portable flags
-  yacc         create \`y.tab.[ch]', if possible, from existing .[ch]
+  aclocal   autoconf  autoheader   autom4te  automake  makeinfo
+  bison     yacc      flex         lex       help2man
 
-Version suffixes to PROGRAM as well as the prefixes \`gnu-', \`gnu', and
-\`g' are ignored when checking the name.
+Version suffixes to PROGRAM as well as the prefixes 'gnu-', 'gnu', and
+'g' are ignored when checking the name.
 
 Send bug reports to <bug-automake@gnu.org>."
     exit $?
@@ -100,272 +70,141 @@ Send bug reports to <bug-automake@gnu.org>."
     ;;
 
   -*)
-    echo 1>&2 "$0: Unknown \`$1' option"
-    echo 1>&2 "Try \`$0 --help' for more information"
+    echo 1>&2 "$0: unknown '$1' option"
+    echo 1>&2 "Try '$0 --help' for more information"
     exit 1
     ;;
 
 esac
 
-# normalize program name to check for.
-program=`echo "$1" | sed '
-  s/^gnu-//; t
-  s/^gnu//; t
-  s/^g//; t'`
+# Run the given program, remember its exit status.
+"$@"; st=$?
 
-# Now exit if we have it, but it failed.  Also exit now if we
-# don't have it and --version was passed (most likely to detect
-# the program).  This is about non-GNU programs, so use $1 not
-# $program.
-case $1 in
-  lex*|yacc*)
-    # Not GNU programs, they don't have --version.
+# If it succeeded, we are done.
+test $st -eq 0 && exit 0
+
+# Also exit now if we it failed (or wasn't found), and '--version' was
+# passed; such an option is passed most likely to detect whether the
+# program is present and works.
+case $2 in --version|--help) exit $st;; esac
+
+# Exit code 63 means version mismatch.  This often happens when the user
+# tries to use an ancient version of a tool on a file that requires a
+# minimum version.
+if test $st -eq 63; then
+  msg="probably too old"
+elif test $st -eq 127; then
+  # Program was missing.
+  msg="missing on your system"
+else
+  # Program was found and executed, but failed.  Give up.
+  exit $st
+fi
+
+perl_URL=http://www.perl.org/
+flex_URL=http://flex.sourceforge.net/
+gnu_software_URL=http://www.gnu.org/software
+
+program_details ()
+{
+  case $1 in
+    aclocal|automake)
+      echo "The '$1' program is part of the GNU Automake package:"
+      echo "<$gnu_software_URL/automake>"
+      echo "It also requires GNU Autoconf, GNU m4 and Perl in order to run:"
+      echo "<$gnu_software_URL/autoconf>"
+      echo "<$gnu_software_URL/m4/>"
+      echo "<$perl_URL>"
+      ;;
+    autoconf|autom4te|autoheader)
+      echo "The '$1' program is part of the GNU Autoconf package:"
+      echo "<$gnu_software_URL/autoconf/>"
+      echo "It also requires GNU m4 and Perl in order to run:"
+      echo "<$gnu_software_URL/m4/>"
+      echo "<$perl_URL>"
+      ;;
+  esac
+}
+
+give_advice ()
+{
+  # Normalize program name to check for.
+  normalized_program=`echo "$1" | sed '
+    s/^gnu-//; t
+    s/^gnu//; t
+    s/^g//; t'`
+
+  printf '%s\n' "'$1' is $msg."
+
+  configure_deps="'configure.ac' or m4 files included by 'configure.ac'"
+  case $normalized_program in
+    autoconf*)
+      echo "You should only need it if you modified 'configure.ac',"
+      echo "or m4 files included by it."
+      program_details 'autoconf'
+      ;;
+    autoheader*)
+      echo "You should only need it if you modified 'acconfig.h' or"
+      echo "$configure_deps."
+      program_details 'autoheader'
+      ;;
+    automake*)
+      echo "You should only need it if you modified 'Makefile.am' or"
+      echo "$configure_deps."
+      program_details 'automake'
+      ;;
+    aclocal*)
+      echo "You should only need it if you modified 'acinclude.m4' or"
+      echo "$configure_deps."
+      program_details 'aclocal'
+      ;;
+   autom4te*)
+      echo "You might have modified some maintainer files that require"
+      echo "the 'automa4te' program to be rebuilt."
+      program_details 'autom4te'
+      ;;
+    bison*|yacc*)
+      echo "You should only need it if you modified a '.y' file."
+      echo "You may want to install the GNU Bison package:"
+      echo "<$gnu_software_URL/bison/>"
+      ;;
+    lex*|flex*)
+      echo "You should only need it if you modified a '.l' file."
+      echo "You may want to install the Fast Lexical Analyzer package:"
+      echo "<$flex_URL>"
+      ;;
+    help2man*)
+      echo "You should only need it if you modified a dependency" \
+           "of a man page."
+      echo "You may want to install the GNU Help2man package:"
+      echo "<$gnu_software_URL/help2man/>"
     ;;
+    makeinfo*)
+      echo "You should only need it if you modified a '.texi' file, or"
+      echo "any other file indirectly affecting the aspect of the manual."
+      echo "You might want to install the Texinfo package:"
+      echo "<$gnu_software_URL/texinfo/>"
+      echo "The spurious makeinfo call might also be the consequence of"
+      echo "using a buggy 'make' (AIX, DU, IRIX), in which case you might"
+      echo "want to install GNU make:"
+      echo "<$gnu_software_URL/make/>"
+      ;;
+    *)
+      echo "You might have modified some files without having the proper"
+      echo "tools for further handling them.  Check the 'README' file, it"
+      echo "often tells you about the needed prerequisites for installing"
+      echo "this package.  You may also peek at any GNU archive site, in"
+      echo "case some other package contains this missing '$1' program."
+      ;;
+  esac
+}
 
-  tar*)
-    if test -n "$run"; then
-       echo 1>&2 "ERROR: \`tar' requires --run"
-       exit 1
-    elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
-       exit 1
-    fi
-    ;;
+give_advice "$1" | sed -e '1s/^/WARNING: /' \
+                       -e '2,$s/^/         /' >&2
 
-  *)
-    if test -z "$run" && ($1 --version) > /dev/null 2>&1; then
-       # We have it, but it failed.
-       exit 1
-    elif test "x$2" = "x--version" || test "x$2" = "x--help"; then
-       # Could not run --version or --help.  This is probably someone
-       # running `$TOOL --version' or `$TOOL --help' to check whether
-       # $TOOL exists and not knowing $TOOL uses missing.
-       exit 1
-    fi
-    ;;
-esac
-
-# If it does not exist, or fails to run (possibly an outdated version),
-# try to emulate it.
-case $program in
-  aclocal*)
-    echo 1>&2 "\
-WARNING: \`$1' is $msg.  You should only need it if
-         you modified \`acinclude.m4' or \`${configure_ac}'.  You might want
-         to install the \`Automake' and \`Perl' packages.  Grab them from
-         any GNU archive site."
-    touch aclocal.m4
-    ;;
-
-  autoconf*)
-    echo 1>&2 "\
-WARNING: \`$1' is $msg.  You should only need it if
-         you modified \`${configure_ac}'.  You might want to install the
-         \`Autoconf' and \`GNU m4' packages.  Grab them from any GNU
-         archive site."
-    touch configure
-    ;;
-
-  autoheader*)
-    echo 1>&2 "\
-WARNING: \`$1' is $msg.  You should only need it if
-         you modified \`acconfig.h' or \`${configure_ac}'.  You might want
-         to install the \`Autoconf' and \`GNU m4' packages.  Grab them
-         from any GNU archive site."
-    files=`sed -n 's/^[ ]*A[CM]_CONFIG_HEADER(\([^)]*\)).*/\1/p' ${configure_ac}`
-    test -z "$files" && files="config.h"
-    touch_files=
-    for f in $files; do
-      case $f in
-      *:*) touch_files="$touch_files "`echo "$f" |
-				       sed -e 's/^[^:]*://' -e 's/:.*//'`;;
-      *) touch_files="$touch_files $f.in";;
-      esac
-    done
-    touch $touch_files
-    ;;
-
-  automake*)
-    echo 1>&2 "\
-WARNING: \`$1' is $msg.  You should only need it if
-         you modified \`Makefile.am', \`acinclude.m4' or \`${configure_ac}'.
-         You might want to install the \`Automake' and \`Perl' packages.
-         Grab them from any GNU archive site."
-    find . -type f -name Makefile.am -print |
-	   sed 's/\.am$/.in/' |
-	   while read f; do touch "$f"; done
-    ;;
-
-  autom4te*)
-    echo 1>&2 "\
-WARNING: \`$1' is needed, but is $msg.
-         You might have modified some files without having the
-         proper tools for further handling them.
-         You can get \`$1' as part of \`Autoconf' from any GNU
-         archive site."
-
-    file=`echo "$*" | sed -n "$sed_output"`
-    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
-    if test -f "$file"; then
-	touch $file
-    else
-	test -z "$file" || exec >$file
-	echo "#! /bin/sh"
-	echo "# Created by GNU Automake missing as a replacement of"
-	echo "#  $ $@"
-	echo "exit 0"
-	chmod +x $file
-	exit 1
-    fi
-    ;;
-
-  bison*|yacc*)
-    echo 1>&2 "\
-WARNING: \`$1' $msg.  You should only need it if
-         you modified a \`.y' file.  You may need the \`Bison' package
-         in order for those modifications to take effect.  You can get
-         \`Bison' from any GNU archive site."
-    rm -f y.tab.c y.tab.h
-    if test $# -ne 1; then
-        eval LASTARG="\${$#}"
-	case $LASTARG in
-	*.y)
-	    SRCFILE=`echo "$LASTARG" | sed 's/y$/c/'`
-	    if test -f "$SRCFILE"; then
-	         cp "$SRCFILE" y.tab.c
-	    fi
-	    SRCFILE=`echo "$LASTARG" | sed 's/y$/h/'`
-	    if test -f "$SRCFILE"; then
-	         cp "$SRCFILE" y.tab.h
-	    fi
-	  ;;
-	esac
-    fi
-    if test ! -f y.tab.h; then
-	echo >y.tab.h
-    fi
-    if test ! -f y.tab.c; then
-	echo 'main() { return 0; }' >y.tab.c
-    fi
-    ;;
-
-  lex*|flex*)
-    echo 1>&2 "\
-WARNING: \`$1' is $msg.  You should only need it if
-         you modified a \`.l' file.  You may need the \`Flex' package
-         in order for those modifications to take effect.  You can get
-         \`Flex' from any GNU archive site."
-    rm -f lex.yy.c
-    if test $# -ne 1; then
-        eval LASTARG="\${$#}"
-	case $LASTARG in
-	*.l)
-	    SRCFILE=`echo "$LASTARG" | sed 's/l$/c/'`
-	    if test -f "$SRCFILE"; then
-	         cp "$SRCFILE" lex.yy.c
-	    fi
-	  ;;
-	esac
-    fi
-    if test ! -f lex.yy.c; then
-	echo 'main() { return 0; }' >lex.yy.c
-    fi
-    ;;
-
-  help2man*)
-    echo 1>&2 "\
-WARNING: \`$1' is $msg.  You should only need it if
-	 you modified a dependency of a manual page.  You may need the
-	 \`Help2man' package in order for those modifications to take
-	 effect.  You can get \`Help2man' from any GNU archive site."
-
-    file=`echo "$*" | sed -n "$sed_output"`
-    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
-    if test -f "$file"; then
-	touch $file
-    else
-	test -z "$file" || exec >$file
-	echo ".ab help2man is required to generate this page"
-	exit $?
-    fi
-    ;;
-
-  makeinfo*)
-    echo 1>&2 "\
-WARNING: \`$1' is $msg.  You should only need it if
-         you modified a \`.texi' or \`.texinfo' file, or any other file
-         indirectly affecting the aspect of the manual.  The spurious
-         call might also be the consequence of using a buggy \`make' (AIX,
-         DU, IRIX).  You might want to install the \`Texinfo' package or
-         the \`GNU make' package.  Grab either from any GNU archive site."
-    # The file to touch is that specified with -o ...
-    file=`echo "$*" | sed -n "$sed_output"`
-    test -z "$file" && file=`echo "$*" | sed -n "$sed_minuso"`
-    if test -z "$file"; then
-      # ... or it is the one specified with @setfilename ...
-      infile=`echo "$*" | sed 's/.* \([^ ]*\) *$/\1/'`
-      file=`sed -n '
-	/^@setfilename/{
-	  s/.* \([^ ]*\) *$/\1/
-	  p
-	  q
-	}' $infile`
-      # ... or it is derived from the source name (dir/f.texi becomes f.info)
-      test -z "$file" && file=`echo "$infile" | sed 's,.*/,,;s,.[^.]*$,,'`.info
-    fi
-    # If the file does not exist, the user really needs makeinfo;
-    # let's fail without touching anything.
-    test -f $file || exit 1
-    touch $file
-    ;;
-
-  tar*)
-    shift
-
-    # We have already tried tar in the generic part.
-    # Look for gnutar/gtar before invocation to avoid ugly error
-    # messages.
-    if (gnutar --version > /dev/null 2>&1); then
-       gnutar "$@" && exit 0
-    fi
-    if (gtar --version > /dev/null 2>&1); then
-       gtar "$@" && exit 0
-    fi
-    firstarg="$1"
-    if shift; then
-	case $firstarg in
-	*o*)
-	    firstarg=`echo "$firstarg" | sed s/o//`
-	    tar "$firstarg" "$@" && exit 0
-	    ;;
-	esac
-	case $firstarg in
-	*h*)
-	    firstarg=`echo "$firstarg" | sed s/h//`
-	    tar "$firstarg" "$@" && exit 0
-	    ;;
-	esac
-    fi
-
-    echo 1>&2 "\
-WARNING: I can't seem to be able to run \`tar' with the given arguments.
-         You may want to install GNU tar or Free paxutils, or check the
-         command line arguments."
-    exit 1
-    ;;
-
-  *)
-    echo 1>&2 "\
-WARNING: \`$1' is needed, and is $msg.
-         You might have modified some files without having the
-         proper tools for further handling them.  Check the \`README' file,
-         it often tells you about the needed prerequisites for installing
-         this package.  You may also peek at any GNU archive site, in case
-         some other package would contain this missing \`$1' program."
-    exit 1
-    ;;
-esac
-
-exit 0
+# Propagate the correct exit status (expected to be 127 for a program
+# not found, 63 for a program that failed due to version mismatch).
+exit $st
 
 # Local variables:
 # eval: (add-hook 'write-file-hooks 'time-stamp)

src/Makefile.in

@@ -1,7 +1,7 @@
-# Makefile.in generated by automake 1.13.4 from Makefile.am.
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+# Copyright (C) 1994-2021 Free Software Foundation, Inc.
 
 # This Makefile.in is free software; the Free Software Foundation
 # gives unlimited permission to copy and/or distribute it,
@@ -16,7 +16,17 @@
 
 
 VPATH = @srcdir@
-am__is_gnu_make = test -n '$(MAKEFILE_LIST)' && test -n '$(MAKELEVEL)'
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
 am__make_running_with_option = \
   case $${target_option-} in \
       ?) ;; \
@@ -79,13 +89,12 @@ PRE_UNINSTALL = :
 POST_UNINSTALL = :
 check_PROGRAMS = test$(EXEEXT)
 subdir = src
-DIST_COMMON = $(srcdir)/Makefile.in $(srcdir)/Makefile.am \
-	$(top_srcdir)/depcomp $(include_HEADERS) \
-	$(top_srcdir)/test-driver
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
 am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
 	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(include_HEADERS) \
+	$(am__DIST_COMMON)
 mkinstalldirs = $(install_sh) -d
 CONFIG_HEADER = $(top_builddir)/config.h
 CONFIG_CLEAN_FILES =
@@ -146,7 +155,8 @@ am__v_at_0 = @
 am__v_at_1 = 
 DEFAULT_INCLUDES = -I.@am__isrc@ -I$(top_builddir)
 depcomp = $(SHELL) $(top_srcdir)/depcomp
-am__depfiles_maybe = depfiles
+am__maybe_remake_depfiles = depfiles
+am__depfiles_remade = ./$(DEPDIR)/bcm2835.Po ./$(DEPDIR)/test.Po
 am__mv = mv -f
 COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
 	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
@@ -185,8 +195,6 @@ am__define_uniq_tagged_files = \
   unique=`for i in $$list; do \
     if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
   done | $(am__uniquify_input)`
-ETAGS = etags
-CTAGS = ctags
 am__tty_colors_dummy = \
   mgn= red= grn= lgn= blu= brg= std=; \
   am__color_tests=no
@@ -342,6 +350,7 @@ am__set_TESTS_bases = \
   bases='$(TEST_LOGS)'; \
   bases=`for i in $$bases; do echo $$i; done | sed 's/\.log$$//'`; \
   bases=`echo $$bases`
+AM_TESTSUITE_SUMMARY_HEADER = ' for $(PACKAGE_STRING)'
 RECHECK_LOGS = $(TEST_LOGS)
 AM_RECURSIVE_TARGETS = check recheck
 TEST_SUITE_LOG = test-suite.log
@@ -364,6 +373,8 @@ TEST_LOGS = $(am__test_logs2:.test.log=.log)
 TEST_LOG_DRIVER = $(SHELL) $(top_srcdir)/test-driver
 TEST_LOG_COMPILE = $(TEST_LOG_COMPILER) $(AM_TEST_LOG_FLAGS) \
 	$(TEST_LOG_FLAGS)
+am__DIST_COMMON = $(srcdir)/Makefile.in $(top_srcdir)/depcomp \
+	$(top_srcdir)/test-driver
 DISTFILES = $(DIST_COMMON) $(DIST_SOURCES) $(TEXINFOS) $(EXTRA_DIST)
 ACLOCAL = @ACLOCAL@
 AMTAR = @AMTAR@
@@ -376,6 +387,8 @@ CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPPFLAGS = @CPPFLAGS@
+CSCOPE = @CSCOPE@
+CTAGS = @CTAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
@@ -383,6 +396,7 @@ DOXYGEN = @DOXYGEN@
 ECHO_C = @ECHO_C@
 ECHO_N = @ECHO_N@
 ECHO_T = @ECHO_T@
+ETAGS = @ETAGS@
 EXEEXT = @EXEEXT@
 INSTALL = @INSTALL@
 INSTALL_DATA = @INSTALL_DATA@
@@ -443,6 +457,7 @@ pdfdir = @pdfdir@
 prefix = @prefix@
 program_transform_name = @program_transform_name@
 psdir = @psdir@
+runstatedir = @runstatedir@
 sbindir = @sbindir@
 sharedstatedir = @sharedstatedir@
 srcdir = @srcdir@
@@ -474,14 +489,13 @@ $(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
 	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu src/Makefile'; \
 	$(am__cd) $(top_srcdir) && \
 	  $(AUTOMAKE) --gnu src/Makefile
-.PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
 	  *config.status*) \
 	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
 	  *) \
-	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe)'; \
-	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__depfiles_maybe);; \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
 	esac;
 
 $(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
@@ -492,6 +506,9 @@ $(top_srcdir)/configure:  $(am__configure_deps)
 $(ACLOCAL_M4):  $(am__aclocal_m4_deps)
 	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
 $(am__aclocal_m4_deps):
+
+clean-checkPROGRAMS:
+	-test -z "$(check_PROGRAMS)" || rm -f $(check_PROGRAMS)
 install-libLIBRARIES: $(lib_LIBRARIES)
 	@$(NORMAL_INSTALL)
 	@list='$(lib_LIBRARIES)'; test -n "$(libdir)" || list=; \
@@ -529,9 +546,6 @@ libbcm2835.a: $(libbcm2835_a_OBJECTS) $(libbcm2835_a_DEPENDENCIES) $(EXTRA_libbc
 	$(AM_V_AR)$(libbcm2835_a_AR) libbcm2835.a $(libbcm2835_a_OBJECTS) $(libbcm2835_a_LIBADD)
 	$(AM_V_at)$(RANLIB) libbcm2835.a
 
-clean-checkPROGRAMS:
-	-test -z "$(check_PROGRAMS)" || rm -f $(check_PROGRAMS)
-
 test$(EXEEXT): $(test_OBJECTS) $(test_DEPENDENCIES) $(EXTRA_test_DEPENDENCIES) 
 	@rm -f test$(EXEEXT)
 	$(AM_V_CCLD)$(LINK) $(test_OBJECTS) $(test_LDADD) $(LIBS)
@@ -542,22 +556,28 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c
 
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/bcm2835.Po@am__quote@
-@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test.Po@am__quote@
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/bcm2835.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/test.Po@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
 
 .c.o:
 @am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
 @am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c $<
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
 
 .c.obj:
 @am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
 @am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
 @AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
-@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c `$(CYGPATH_W) '$<'`
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
 install-includeHEADERS: $(include_HEADERS)
 	@$(NORMAL_INSTALL)
 	@list='$(include_HEADERS)'; test -n "$(includedir)" || list=; \
@@ -662,7 +682,7 @@ $(TEST_SUITE_LOG): $(TEST_LOGS)
 	if test -n "$$am__remaking_logs"; then \
 	  echo "fatal: making $(TEST_SUITE_LOG): possible infinite" \
 	       "recursion detected" >&2; \
-	else \
+	elif test -n "$$redo_logs"; then \
 	  am__remaking_logs=yes $(MAKE) $(AM_MAKEFLAGS) $$redo_logs; \
 	fi; \
 	if $(am__make_dryrun); then :; else \
@@ -739,7 +759,7 @@ $(TEST_SUITE_LOG): $(TEST_LOGS)
 	  test x"$$VERBOSE" = x || cat $(TEST_SUITE_LOG);		\
 	fi;								\
 	echo "$${col}$$br$${std}"; 					\
-	echo "$${col}Testsuite summary for $(PACKAGE_STRING)$${std}";	\
+	echo "$${col}Testsuite summary"$(AM_TESTSUITE_SUMMARY_HEADER)"$${std}";	\
 	echo "$${col}$$br$${std}"; 					\
 	create_testsuite_report --maybe-color;				\
 	echo "$$col$$br$$std";						\
@@ -752,7 +772,7 @@ $(TEST_SUITE_LOG): $(TEST_LOGS)
 	fi;								\
 	$$success || exit 1
 
-check-TESTS:
+check-TESTS: $(check_PROGRAMS)
 	@list='$(RECHECK_LOGS)';           test -z "$$list" || rm -f $$list
 	@list='$(RECHECK_LOGS:.log=.trs)'; test -z "$$list" || rm -f $$list
 	@test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
@@ -794,8 +814,10 @@ test.log: test$(EXEEXT)
 @am__EXEEXT_TRUE@	--log-file $$b.log --trs-file $$b.trs \
 @am__EXEEXT_TRUE@	$(am__common_driver_flags) $(AM_TEST_LOG_DRIVER_FLAGS) $(TEST_LOG_DRIVER_FLAGS) -- $(TEST_LOG_COMPILE) \
 @am__EXEEXT_TRUE@	"$$tst" $(AM_TESTS_FD_REDIRECT)
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
 
-distdir: $(DISTFILES)
+distdir-am: $(DISTFILES)
 	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
 	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
 	list='$(DISTFILES)'; \
@@ -874,7 +896,8 @@ clean-am: clean-checkPROGRAMS clean-generic clean-libLIBRARIES \
 	mostlyclean-am
 
 distclean: distclean-am
-	-rm -rf ./$(DEPDIR)
+		-rm -f ./$(DEPDIR)/bcm2835.Po
+	-rm -f ./$(DEPDIR)/test.Po
 	-rm -f Makefile
 distclean-am: clean-am distclean-compile distclean-generic \
 	distclean-tags
@@ -920,7 +943,8 @@ install-ps-am:
 installcheck-am:
 
 maintainer-clean: maintainer-clean-am
-	-rm -rf ./$(DEPDIR)
+		-rm -f ./$(DEPDIR)/bcm2835.Po
+	-rm -f ./$(DEPDIR)/test.Po
 	-rm -f Makefile
 maintainer-clean-am: distclean-am maintainer-clean-generic
 
@@ -940,13 +964,13 @@ uninstall-am: uninstall-includeHEADERS uninstall-libLIBRARIES
 
 .MAKE: check-am install-am install-strip
 
-.PHONY: CTAGS GTAGS TAGS all all-am check check-TESTS check-am clean \
-	clean-checkPROGRAMS clean-generic clean-libLIBRARIES \
-	cscopelist-am ctags ctags-am distclean distclean-compile \
-	distclean-generic distclean-tags distdir dvi dvi-am html \
-	html-am info info-am install install-am install-data \
-	install-data-am install-dvi install-dvi-am install-exec \
-	install-exec-am install-html install-html-am \
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+	check-am clean clean-checkPROGRAMS clean-generic \
+	clean-libLIBRARIES cscopelist-am ctags ctags-am distclean \
+	distclean-compile distclean-generic distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
 	install-includeHEADERS install-info install-info-am \
 	install-libLIBRARIES install-man install-pdf install-pdf-am \
 	install-ps install-ps-am install-strip installcheck \
@@ -956,6 +980,8 @@ uninstall-am: uninstall-includeHEADERS uninstall-libLIBRARIES
 	uninstall uninstall-am uninstall-includeHEADERS \
 	uninstall-libLIBRARIES
 
+.PRECIOUS: Makefile
+
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.

src/bcm2835.h

@@ -4,26 +4,30 @@
   
    Author: Mike McCauley
    Copyright (C) 2011-2013 Mike McCauley
-   $Id: bcm2835.h,v 1.20 2015/03/31 04:55:41 mikem Exp mikem $
+   $Id: bcm2835.h,v 1.26 2020/01/11 05:07:13 mikem Exp mikem $
 */
 
 /*! \mainpage C library for Broadcom BCM 2835 as used in Raspberry Pi
   
   This is a C library for Raspberry Pi (RPi). It provides access to 
-  GPIO and other IO functions on the Broadcom BCM 2835 chip,
+  GPIO and other IO functions on the Broadcom BCM 2835 chip, as used in the RaspberryPi,
   allowing access to the GPIO pins on the
   26 pin IDE plug on the RPi board so you can control and interface with various external devices.
   
   It provides functions for reading digital inputs and setting digital outputs, using SPI and I2C,
   and for accessing the system timers.
   Pin event detection is supported by polling (interrupts are not supported).
+
+  Works on all versions up to and including RPI 4. 
+  Works with all versions of Debian up to and including Debian Buster 10.
+  Reported to be working on Bullseye (Raspbian v11) 
   
   It is C++ compatible, and installs as a header file and non-shared library on 
   any Linux-based distro (but clearly is no use except on Raspberry Pi or another board with 
   BCM 2835).
   
   The version of the package that this documentation refers to can be downloaded 
-  from http://www.airspayce.com/mikem/bcm2835/bcm2835-1.50.tar.gz
+  from http://www.airspayce.com/mikem/bcm2835/bcm2835-1.75.tar.gz
   You can find the latest version at http://www.airspayce.com/mikem/bcm2835
   
   Several example programs are provided.
@@ -35,7 +39,10 @@
   You can also find online help and discussion at http://groups.google.com/group/bcm2835
   Please use that group for all questions and discussions on this topic. 
   Do not contact the author directly, unless it is to discuss commercial licensing.
-  Before asking a question or reporting a bug, please read http://www.catb.org/esr/faqs/smart-questions.html
+  Before asking a question or reporting a bug, please read 
+  - http://en.wikipedia.org/wiki/Wikipedia:Reference_desk/How_to_ask_a_software_question
+  - http://www.catb.org/esr/faqs/smart-questions.html
+  - http://www.chiark.greenend.org.uk/~shgtatham/bugs.html
   
   Tested on debian6-19-04-2012, 2012-07-15-wheezy-raspbian, 2013-07-26-wheezy-raspbian
   and Occidentalisv01, 2016-02-09 Raspbian Jessie.
@@ -48,6 +55,11 @@
   If you must use bcm2835_gpio_len() and friends, make sure you disable the pins with 
   bcm2835_gpio_clr_len() and friends after use. 
   
+  In order to compile this library, you may need to install:
+   - libc6-dev
+   - libgcc-s-dev 
+   - libstdc++-staticdev 
+
   \par Running as root
 
   Prior to the release of Raspbian Jessie in Feb 2016, access to any
@@ -66,6 +78,34 @@
   bcm2835_spi_begin() and bcm2835_i2c_begin() will return false and all
   other non-gpio operations may fail silently or crash.
 
+  If your program needs acccess to /dev/mem but not as root, 
+  and if you have the libcap-dev package installed on the target, 
+  you can compile this library to use
+  libcap2 so that it tests whether the exceutable has the cap_sys_rawio capability, and therefore
+  permission to access /dev/mem.
+  To enable this ability, uncomment the #define BCM2835_HAVE_LIBCAP in bcm2835.h or 
+  -DBCM2835_HAVE_LIBCAP on your compiler command line.
+  After your program has been compiled:
+  \code
+  sudo setcap cap_sys_rawio+ep *myprogname*
+  \endcode
+  You also need to do these steps on the host once, to support libcap and not-root read/write access 
+  to /dev/mem:
+  1. Install libcap support
+  \code
+    sudo apt-get install libcap2 libcap-dev
+  2. Add current user to kmem group
+  \code
+    sudo adduser $USER kmem
+  \endcode
+  3. Allow write access to /dev/mem by members of kmem group
+  \code
+    echo 'SUBSYSTEM=="mem", KERNEL=="mem", GROUP="kmem", MODE="0660"' | sudo tee /etc/udev/rules.d/98-mem.rules
+  \endcode
+  \code
+    sudo reboot
+  \endcode
+
   \par Installation
   
   This library consists of a single non-shared library and header file, which will be
@@ -106,6 +146,8 @@
   bcm2835_st
   bcm2835_bsc0
   bcm2835_bsc1
+  bcm2835_aux
+  bcm2835_spi1
 
   \par Raspberry Pi 2 (RPI2)
 
@@ -159,7 +201,32 @@
   - P1-23 (CLK) 
   - P1-24 (CE0) 
   - P1-26 (CE1)
+
+  Although it is possible to select high speeds for the SPI interface, up to 125MHz (see bcm2835_spi_setClockDivider())
+  you should not expect to actually achieve those sorts of speeds with the RPi wiring. Our tests on RPi 2 show that the
+  SPI CLK line when unloaded has a resonant frequency of about 40MHz, and when loaded, the MOSI and MISO lines
+  ring at an even lower frequency. Measurements show that SPI waveforms are very poor and unusable at 62 and 125MHz.
+  Dont expect any speed faster than 31MHz to work reliably.
+
+  The bcm2835_aux_spi_* functions allow you to control the BCM 2835 SPI1 interface,
+  allowing you to send and received data by SPI (Serial Peripheral Interface).
+
+  The Raspberry Pi GPIO pins used for AUX SPI (SPI1) are:
+
+  - P1-38 (MOSI)
+  - P1-35 (MISO)
+  - P1-40 (CLK)
+  - P1-36 (CE2)
+
+  Caution: The bcm2835 library works directly on the SPI/I2C devices. It is not using 
+  any Linux device drivers. When relevant Linux drivers are loaded or 
+  activated then it can create unexpected behavior from other software like 
+  'i2cdetect'.
   
+  Here is a simple utility which detects I2C bus devices with the bcm2835 
+  library.
+  https://github.com/gavinlyonsrepo/RPI_Tools/tree/main/src/i2cdetect
+
   \par I2C Pins
   
   The bcm2835_i2c_* functions allow you to control the BCM 2835 BSC interface,
@@ -215,8 +282,8 @@
   clock divider to be 16, and the RANGE to 1024. The pulse repetition frequency will be
   1.2MHz/1024 = 1171.875Hz.
   
-  \par SPI
-
+  \par Interactions with other systems
+ 
   In order for bcm2835 library SPI to work, you may need to disable the SPI kernel module using:
 
   \code
@@ -226,6 +293,20 @@
    Reboot.
   \endcode
 
+  Since bcm2835 accesses the lowest level hardware interfaces (in eh intererests of speed and flexibility)
+  there can be intercations with other low level software trying to do similar things.
+
+  It seems that with "latest" 8.0 Jessie 4.9.24-v7+ kernel PWM just won't 
+  work unless you disable audio. There's a line
+  \code
+  dtparam=audio=on
+  \endcode
+  in the /boot/config.txt. 
+  Comment it out like this:
+  \code
+  #dtparam=audio=on
+  \endcode
+
   \par Real Time performance constraints
   
   The bcm2835 is a library for user programs (i.e. they run in 'userland'). 
@@ -240,6 +321,9 @@
   Arjan reports that you can prevent swapping on Linux with the following code fragment:
   
   \code
+  #define <sched.h>
+  #define <sys/mman.h>
+
   struct sched_param sp;
   memset(&sp, 0, sizeof(sp));
   sp.sched_priority = sched_get_priority_max(SCHED_FIFO);
@@ -247,26 +331,45 @@
   mlockall(MCL_CURRENT | MCL_FUTURE);
   \endcode
   
+  \par Crashing on some versions of Raspbian
+  Some people have reported that various versions of Rasbian will crash or hang 
+  if certain GPIO pins are toggled: https://github.com/raspberrypi/linux/issues/2550
+  when using bcm2835.
+  A workaround is to add this line to your /boot/config.txt:
+  \code
+    dtoverlay=gpio-no-irq
+  \endcode
+
   \par Bindings to other languages
   
   mikem has made Perl bindings available at CPAN:
   http://search.cpan.org/~mikem/Device-BCM2835-1.9/lib/Device/BCM2835.pm
+
   Matthew Baker has kindly made Python bindings available at:
   https:  github.com/mubeta06/py-libbcm2835
+
   Gary Marks has created a Serial Peripheral Interface (SPI) command-line utility 
   for Raspberry Pi, based on the bcm2835 library. The 
   utility, spincl, is licensed under Open Source GNU GPLv3 by iP Solutions (http://ipsolutionscorp.com), as a 
   free download with source included: http://ipsolutionscorp.com/raspberry-pi-spi-utility/
   
-  \par Open Source Licensing GPL V2
+  Bindings for Ada are available courtesy Tama McGlinn at https://github.com/TamaMcGlinn/ada_raspio
+  
+  \par Open Source Licensing GPL V3
   
   This is the appropriate option if you want to share the source code of your
   application with everyone you distribute it to, and you also want to give them
   the right to share who uses it. If you wish to use this software under Open
   Source Licensing, you must contribute all your source code to the open source
-  community in accordance with the GPL Version 2 when your application is
-  distributed. See http://www.gnu.org/copyleft/gpl.html and COPYING
+  community in accordance with the GPL Version 3 when your application is
+  distributed. See https://www.gnu.org/licenses/gpl-3.0.html and COPYING
   
+  \par Commercial Licensing
+
+ This is the appropriate option if you are creating proprietary applications
+ and you are not prepared to distribute and share the source code of your
+ application. To purchase a commercial license, contact info@airspayce.com
+
   \par Acknowledgements
   
   Some of this code has been inspired by Dom and Gert.
@@ -367,7 +470,7 @@
 
   \version 1.27 bcm2835_gpio_set_pad() no longer needs BCM2835_PAD_PASSWRD: it is
   now automatically included.
-  Added suport for PWM mode with bcm2835_pwm_* functions.
+  Added support for PWM mode with bcm2835_pwm_* functions.
 
   \version 1.28 Fixed a problem where bcm2835_spi_writenb() would have problems with transfers of more than
   64 bytes dues to read buffer filling. Patched by Peter Würtz.
@@ -402,7 +505,7 @@
 
   \version 1.39 Beta version of RPi2 compatibility. Not tested here on RPi2 hardware. 
   Testers please confirm correct operation on RPi2.<br>
-  Unneccessary 'volatile' qualifiers removed from all variables and signatures.<br>
+  Unnecessary 'volatile' qualifiers removed from all variables and signatures.<br>
   Removed unsupportable PWM dividers, based on a report from Christophe Cecillon.<br>
   Minor improvements to spi.c example.<br>
 
@@ -424,13 +527,13 @@
   Testing on RPI 2, with ArchLinuxARM-rpi-2-latest and 2015-02-16-raspbian-wheezy.<br>
 
   \version 1.44 Added documention about the need for device tree to be enabled on RPI2.<br>
-  Improvements to detection of availablity of DMB instruction based on value of __ARM_ARCH macro.<br>
+  Improvements to detection of availability of DMB instruction based on value of __ARM_ARCH macro.<br>
 
   \version 1.45 Fixed an error in the pad group offsets that would prevent bcm2835_gpio_set_pad() 
   and bcm2835_gpio_pad() working correctly with non-0 pad groups. Reported by Guido.
 
   \version 1.46 2015-09-18
-           Added symbolic definitions for remaining pins on 40 pin GPIO header on RPi 2. <br>
+  Added symbolic definitions for remaining pins on 40 pin GPIO header on RPi 2. <br>
 
   \version 1.47 2015-11-18
   Fixed possibly incorrect reads in bcm2835_i2c_read_register_rs, patch from Eckhardt Ulrich.<br>
@@ -448,7 +551,101 @@
   (which prevents access to the SPI and I2C peripherals, amongst others). 
   Testing on Raspbian Jessie.
 
-  \author  Mike McCauley (mikem@airspayce.com) DO NOT CONTACT THE AUTHOR DIRECTLY: USE THE LISTS
+  \version 1.51 2016-11-03
+  Added documentation about SPI clock divider and resulting SPI speeds on RPi3.
+  Fixed a problem where seg fault could occur in bcm2835_delayMicroseconds() if not running as root. Patch from Pok.
+
+  \version 1.52 2017-02-03
+  Added link to commercial license purchasing.
+
+  \version 1.53 2018-01-14
+  Added support for AUX SPI (SPI1)
+  Contributed by Arjan van Vught (http://www.raspberrypi-dmx.org/)
+
+  \version 1.54 2018-01-17
+  Fixed compile errors in new AUX spi code under some circumstances.
+
+  \version 1.55 2018-01-20
+  Fixed version numbers.
+  Fixed some warnings.
+
+  \version 1.56 2018-06-10
+  Supports bcm2835_spi_setBitOrder(BCM2835_SPI_BIT_ORDER_LSBFIRST), after which SPI bytes are reversed on read or write.
+  Based on a suggestion by Damiano Benedetti.
+  
+  \version 1.57 2018-08-28
+  Added SPI function bcm2835_spi_set_speed_hz(uint32_t speed_hz);
+  Contributed by Arjan van Vught (http://www.raspberrypi-dmx.org/)
+
+  \version 1.58 2018-11-29
+  Added examples/spiram, which shows how to use the included little library (spiram.c and spiram.h)
+  to read and write SPI RAM chips such as 23K256-I/P
+
+  \version 1.59 2019-05-22
+  Fixed a bug in bcm2835_i2c_read reported by Charles Hayward where a noisy I2C line cold cause a seg fault by
+  reading too many characters.
+  
+  \version 1.60 2019-07-23
+  Applied patch from Mark Dootson for RPi 4 compatibility. Thanks Mark. Not tested here on RPi4, but others report it works.
+  Tested as still working correctly on earlier RPi models. Tested with Debian Buster on earlier models
+
+  \version 1.61 2020-01-11
+  Fixed errors in the documentation for bcm2835_spi_write.
+  Fixes issue seen on Raspberry Pi 4 boards where 64-bit off_t is used by
+  default via -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64.  The offset was
+  being incorrectly converted, this way is clearer and fixes the problem. Contributed by Jonathan Perkin.
+
+  \version 1.62 2020-01-12
+  Fixed a problem that could cause compile failures with size_t and off_t
+
+  \version 1.63 2020-03-07
+  Added bcm2835_aux_spi_transfer, contributed by Michivi
+  Adopted GPL V3 licensing
+
+  \version 1.64 2020-04-11
+  Fixed error in definitions of BCM2835_AUX_SPI_STAT_TX_LVL and BCM2835_AUX_SPI_STAT_RX_LVL. Patch from 
+  Eric Marzec. Thanks.
+
+  \version 1.65, 1.66 2020-04-16
+  Added support for use of capability  cap_sys_rawio to determine if access to /dev/mem is available for non-root
+  users. Contributed by Doug McFadyen.
+
+  \version 1.67, 1.66 2020-06-11
+  Fixed an error in bcm2835_i2c_read() where the status byte was not correctly updated with BCM2835_BSC_S_DONE
+  Reported by Zihan. Thanks.
+
+  \version 1.69, 2021-03-30
+  Added link to Ada bindings by Tama McGlinn.
+  Fixed problem with undefined off_t on some compilers.
+
+  \version 1.70, 
+  Patch to ensure compilation with gcc -std=c99, as reported by John Blaiklock.
+  Fix some inconsistencies in version numbers
+
+  \version 1.71
+  Added SMI bus support, courtesy of Benoit Bouchez, including new functions:  
+  bcm2835_smi_begin(),  bcm2835_smi_end(),
+  bcm2835_smi_set_timing(),  bcm2835_smi_write(), bcm2835_smi_read().
+
+  \version 1.72
+  Added examples/smi/smi.c showing how to use new SMI bus support, courtesy Benoit Bouchez.
+  Added support for disabling documentation genetration with "./configure --with-docs=no", courtesy of 
+    Christian Zuckschwerdt.
+
+  \version 1.73
+  Fixed some inconsistent indenting in bcm2835.c that triggers warnings for some people.
+  Added Timeout checks to bcm2835_i2c_write() in case of IO problems. New reason cade BCM2835_I2C_REASON_ERROR_TIMEOUT
+  added. Patch courtesy Simon Peacock.
+
+  \version 1.74
+  Timeout in bcm2835_i2c_write() increased by a factor of 10 because some users have reported spurious timeouts at slow speeds.
+
+  \version 1.75
+  Patches to bcm2835_aux_spi_transfernb() from Sean Goff to deal with the case where
+  the process is interrupted between filling the TX FIFO and reading the RX FIFO.
+
+  
+  \author  Mike McCauley DO NOT CONTACT THE AUTHOR DIRECTLY: USE THE LISTS
 */
 
 
@@ -458,11 +655,21 @@
 
 #include <stdint.h>
 
-#define BCM2835_VERSION 10050 /* Version 1.50 */
+/* Some compilers need this, as reported by Sam James */
+#include <sys/types.h>
+/* Needed to compile with gcc -std=c99, as reported by John Blaiklock.*/
+#include <fcntl.h>
+
+#define BCM2835_VERSION 10075 /* Version 1.75 */
+
+// Define this if you want to use libcap2 to determine if you have the cap_sys_rawio capability
+// and therefore the capability of opening /dev/mem, even if you are not root.
+// See the comments above in the documentation for 'Running As Root'
+//#define BCM2835_HAVE_LIBCAP
 
 /* RPi 2 is ARM v7, and has DMB instruction for memory barriers.
    Older RPis are ARM v6 and don't, so a coprocessor instruction must be used instead.
-   However, not all versions of gcc in all distros support the dmb assembler instruction even on conmpatible processors.
+   However, not all versions of gcc in all distros support the dmb assembler instruction even on compatible processors.
    This test is so any ARMv7 or higher processors with suitable GCC will use DMB.
 */
 #if __ARM_ARCH >= 7
@@ -479,15 +686,16 @@
 /*! This means pin LOW, false, 0volts on a pin. */
 #define LOW  0x0
 
+/*! Return the minimum of 2 numbers */
+#ifndef MIN
+#define MIN(a, b) (a < b ? a : b)
+#endif
+
 /*! Speed of the core clock core_clk */
 #define BCM2835_CORE_CLK_HZ		250000000	/*!< 250 MHz */
 
-/*! On RPi2 with BCM2836, and all recent OSs, the base of the peripherals is read from a /proc file */
+/*! On all recent OSs, the base of the peripherals is read from a /proc file */
 #define BMC2835_RPI2_DT_FILENAME "/proc/device-tree/soc/ranges"
-/*! Offset into BMC2835_RPI2_DT_FILENAME for the peripherals base address */
-#define BMC2835_RPI2_DT_PERI_BASE_ADDRESS_OFFSET 4
-/*! Offset into BMC2835_RPI2_DT_FILENAME for the peripherals size address */
-#define BMC2835_RPI2_DT_PERI_SIZE_OFFSET 8
 
 /*! Physical addresses for various peripheral register sets
   Base Physical Address of the BCM 2835 peripheral registers
@@ -499,11 +707,17 @@
 #define BCM2835_PERI_BASE               0x20000000
 /*! Size of the peripherals block on RPi 1 */
 #define BCM2835_PERI_SIZE               0x01000000
+/*! Alternate base address for RPI  2 / 3 */
+#define BCM2835_RPI2_PERI_BASE          0x3F000000
+/*! Alternate base address for RPI  4 */
+#define BCM2835_RPI4_PERI_BASE          0xFE000000
+/*! Alternate size for RPI  4 */
+#define BCM2835_RPI4_PERI_SIZE          0x01800000
 
 /*! Offsets for the bases of various peripherals within the peripherals block
   /   Base Address of the System Timer registers
 */
-#define BCM2835_ST_BASE			0x3000
+#define BCM2835_ST_BASE					0x3000
 /*! Base Address of the Pads registers */
 #define BCM2835_GPIO_PADS               0x100000
 /*! Base Address of the Clock/timer registers */
@@ -513,18 +727,30 @@
 /*! Base Address of the SPI0 registers */
 #define BCM2835_SPI0_BASE               0x204000
 /*! Base Address of the BSC0 registers */
-#define BCM2835_BSC0_BASE 		0x205000
+#define BCM2835_BSC0_BASE 				0x205000
 /*! Base Address of the PWM registers */
 #define BCM2835_GPIO_PWM                0x20C000
+/*! Base Address of the AUX registers */
+#define BCM2835_AUX_BASE				0x215000
+/*! Base Address of the AUX_SPI1 registers */
+#define BCM2835_SPI1_BASE				0x215080
+/*! Base Address of the AUX_SPI2 registers */
+#define BCM2835_SPI2_BASE				0x2150C0
 /*! Base Address of the BSC1 registers */
-#define BCM2835_BSC1_BASE		0x804000
+#define BCM2835_BSC1_BASE				0x804000
+
+/* BEB */
+/*! Base address of the SMI registers */
+#define BCM2835_SMI_BASE                0x600000
+
+#include <stdlib.h>
 
 /*! Physical address and size of the peripherals block
   May be overridden on RPi2
 */
-extern uint32_t *bcm2835_peripherals_base;
+extern off_t bcm2835_peripherals_base;
 /*! Size of the peripherals block to be mapped */
-extern uint32_t bcm2835_peripherals_size;
+extern size_t bcm2835_peripherals_size;
 
 /*! Virtual memory address of the mapped peripherals block */
 extern uint32_t *bcm2835_peripherals;
@@ -569,6 +795,22 @@ extern volatile uint32_t *bcm2835_bsc0;
 */
 extern volatile uint32_t *bcm2835_bsc1;
 
+/*! Base of the AUX registers.
+  Available after bcm2835_init has been called (as root)
+*/
+extern volatile uint32_t *bcm2835_aux;
+
+/*! Base of the SPI1 registers.
+  Available after bcm2835_init has been called (as root)
+*/
+extern volatile uint32_t *bcm2835_spi1;
+
+/* BEB */
+/*! Base of SMI registers.
+  Available after bcm2835_init has been called (as root)
+*/
+extern volatile uint32_t *bcm2835_smi;
+
 /*! \brief bcm2835RegisterBase
   Register bases for bcm2835_regbase()
 */
@@ -581,7 +823,12 @@ typedef enum
     BCM2835_REGBASE_PADS = 5, /*!< Base of the PADS registers. */
     BCM2835_REGBASE_SPI0 = 6, /*!< Base of the SPI0 registers. */
     BCM2835_REGBASE_BSC0 = 7, /*!< Base of the BSC0 registers. */
-    BCM2835_REGBASE_BSC1 = 8  /*!< Base of the BSC1 registers. */
+    BCM2835_REGBASE_BSC1 = 8, /*!< Base of the BSC1 registers. */
+    BCM2835_REGBASE_AUX  = 9, /*!< Base of the AUX registers. */
+    BCM2835_REGBASE_SPI1 = 10,/*!< Base of the SPI1 registers. */
+    /* BEB */
+    BCM2835_REGBASE_SMI = 11  /*!< Base of the SMI registers. */
+
 } bcm2835RegisterBase;
 
 /*! Size of memory page on RPi */
@@ -627,6 +874,12 @@ typedef enum
 #define BCM2835_GPPUDCLK0                    0x0098 /*!< GPIO Pin Pull-up/down Enable Clock 0 */
 #define BCM2835_GPPUDCLK1                    0x009c /*!< GPIO Pin Pull-up/down Enable Clock 1 */
 
+/* 2711 has a different method for pin pull-up/down/enable  */
+#define BCM2835_GPPUPPDN0                    0x00e4 /* Pin pull-up/down for pins 15:0  */
+#define BCM2835_GPPUPPDN1                    0x00e8 /* Pin pull-up/down for pins 31:16 */
+#define BCM2835_GPPUPPDN2                    0x00ec /* Pin pull-up/down for pins 47:32 */
+#define BCM2835_GPPUPPDN3                    0x00f0 /* Pin pull-up/down for pins 57:48 */
+
 /*!   \brief bcm2835PortFunction
   Port function select modes for bcm2835_gpio_fsel()
 */
@@ -653,6 +906,9 @@ typedef enum
     BCM2835_GPIO_PUD_UP      = 0x02    /*!< Enable Pull Up control 0b10  */
 } bcm2835PUDControl;
 
+/* need a value for pud functions that can't work unless RPI 4 */
+#define BCM2835_GPIO_PUD_ERROR  0x08 
+
 /*! Pad control register offsets from BCM2835_GPIO_PADS */
 #define BCM2835_PADS_GPIO_0_27               0x002c /*!< Pad control register for pads 0 to 27 */
 #define BCM2835_PADS_GPIO_28_45              0x0030 /*!< Pad control register for pads 28 to 45 */
@@ -737,7 +993,7 @@ typedef enum
     RPI_V2_GPIO_P1_31     =  6,  /*!< Version 2, Pin P1-31 */
     RPI_V2_GPIO_P1_32     = 12,  /*!< Version 2, Pin P1-32 */
     RPI_V2_GPIO_P1_33     = 13,  /*!< Version 2, Pin P1-33 */
-    RPI_V2_GPIO_P1_35     = 19,  /*!< Version 2, Pin P1-35 */
+    RPI_V2_GPIO_P1_35     = 19,  /*!< Version 2, Pin P1-35, can be PWM channel 1 in ALT FUN 5  */
     RPI_V2_GPIO_P1_36     = 16,  /*!< Version 2, Pin P1-36 */
     RPI_V2_GPIO_P1_37     = 26,  /*!< Version 2, Pin P1-37 */
     RPI_V2_GPIO_P1_38     = 20,  /*!< Version 2, Pin P1-38 */
@@ -771,13 +1027,69 @@ typedef enum
     RPI_BPLUS_GPIO_J8_31     =  6,  /*!< B+, Pin J8-31,  */
     RPI_BPLUS_GPIO_J8_32     = 12,  /*!< B+, Pin J8-32,  */
     RPI_BPLUS_GPIO_J8_33     = 13,  /*!< B+, Pin J8-33,  */
-    RPI_BPLUS_GPIO_J8_35     = 19,  /*!< B+, Pin J8-35,  */
+    RPI_BPLUS_GPIO_J8_35     = 19,  /*!< B+, Pin J8-35, can be PWM channel 1 in ALT FUN 5 */
     RPI_BPLUS_GPIO_J8_36     = 16,  /*!< B+, Pin J8-36,  */
     RPI_BPLUS_GPIO_J8_37     = 26,  /*!< B+, Pin J8-37,  */
     RPI_BPLUS_GPIO_J8_38     = 20,  /*!< B+, Pin J8-38,  */
     RPI_BPLUS_GPIO_J8_40     = 21   /*!< B+, Pin J8-40,  */
 } RPiGPIOPin;
 
+/* Defines for AUX
+  GPIO register offsets from BCM2835_AUX_BASE.
+*/
+#define BCM2835_AUX_IRQ			0x0000  /*!< xxx */
+#define BCM2835_AUX_ENABLE		0x0004  /*!< */
+
+#define BCM2835_AUX_ENABLE_UART1	0x01    /*!<  */
+#define BCM2835_AUX_ENABLE_SPI0		0x02	/*!< SPI0 (SPI1 in the device) */
+#define BCM2835_AUX_ENABLE_SPI1		0x04	/*!< SPI1 (SPI2 in the device) */
+
+
+#define BCM2835_AUX_SPI_CNTL0		0x0000  /*!< */
+#define BCM2835_AUX_SPI_CNTL1 		0x0004  /*!< */
+#define BCM2835_AUX_SPI_STAT 		0x0008  /*!< */
+#define BCM2835_AUX_SPI_PEEK		0x000C  /*!< Read but do not take from FF */
+#define BCM2835_AUX_SPI_IO		0x0020  /*!< Write = TX, read=RX */
+#define BCM2835_AUX_SPI_TXHOLD		0x0030  /*!< Write = TX keep CS, read=RX */
+
+#define BCM2835_AUX_SPI_CLOCK_MIN	30500		/*!< 30,5kHz */
+#define BCM2835_AUX_SPI_CLOCK_MAX	125000000 	/*!< 125Mhz */
+
+#define BCM2835_AUX_SPI_CNTL0_SPEED	0xFFF00000  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_SPEED_MAX	0xFFF      /*!< */
+#define BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT 20        /*!< */
+
+#define BCM2835_AUX_SPI_CNTL0_CS0_N     0x000C0000 /*!< CS 0 low */
+#define BCM2835_AUX_SPI_CNTL0_CS1_N     0x000A0000 /*!< CS 1 low */
+#define BCM2835_AUX_SPI_CNTL0_CS2_N 	0x00060000 /*!< CS 2 low */
+
+#define BCM2835_AUX_SPI_CNTL0_POSTINPUT	0x00010000  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_VAR_CS	0x00008000  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_VAR_WIDTH	0x00004000  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_DOUTHOLD	0x00003000  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_ENABLE	0x00000800  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_CPHA_IN	0x00000400  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_CLEARFIFO	0x00000200  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_CPHA_OUT	0x00000100  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_CPOL	0x00000080  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_MSBF_OUT	0x00000040  /*!< */
+#define BCM2835_AUX_SPI_CNTL0_SHIFTLEN	0x0000003F  /*!< */
+
+#define BCM2835_AUX_SPI_CNTL1_CSHIGH	0x00000700  /*!< */
+#define BCM2835_AUX_SPI_CNTL1_IDLE	0x00000080  /*!< */
+#define BCM2835_AUX_SPI_CNTL1_TXEMPTY	0x00000040  /*!< */
+#define BCM2835_AUX_SPI_CNTL1_MSBF_IN	0x00000002  /*!< */
+#define BCM2835_AUX_SPI_CNTL1_KEEP_IN	0x00000001  /*!< */
+
+#define BCM2835_AUX_SPI_STAT_TX_LVL	0xF0000000  /*!< */
+#define BCM2835_AUX_SPI_STAT_RX_LVL	0x00F00000  /*!< */
+#define BCM2835_AUX_SPI_STAT_TX_FULL	0x00000400  /*!< */
+#define BCM2835_AUX_SPI_STAT_TX_EMPTY	0x00000200  /*!< */
+#define BCM2835_AUX_SPI_STAT_RX_FULL	0x00000100  /*!< */
+#define BCM2835_AUX_SPI_STAT_RX_EMPTY	0x00000080  /*!< */
+#define BCM2835_AUX_SPI_STAT_BUSY	0x00000040  /*!< */
+#define BCM2835_AUX_SPI_STAT_BITCOUNT	0x0000003F  /*!< */
+
 /* Defines for SPI
    GPIO register offsets from BCM2835_SPI0_BASE. 
    Offsets into the SPI Peripheral block in bytes per 10.5 SPI Register Map
@@ -851,36 +1163,43 @@ typedef enum
 /*! \brief bcm2835SPIClockDivider
   Specifies the divider used to generate the SPI clock from the system clock.
   Figures below give the divider, clock period and clock frequency.
-  Clock divided is based on nominal base clock rate of 250MHz
+  Clock divided is based on nominal core clock rate of 250MHz on RPi1 and RPi2, and 400MHz on RPi3.
   It is reported that (contrary to the documentation) any even divider may used.
-  The frequencies shown for each divider have been confirmed by measurement.
+  The frequencies shown for each divider have been confirmed by measurement on RPi1 and RPi2.
+  The system clock frequency on RPi3 is different, so the frequency you get from a given divider will be different.
+  See comments in 'SPI Pins' for information about reliable SPI speeds.
+  Note: it is possible to change the core clock rate of the RPi 3 back to 250MHz, by putting 
+  \code
+  core_freq=250
+  \endcode
+  in the config.txt
 */
 typedef enum
 {
-    BCM2835_SPI_CLOCK_DIVIDER_65536 = 0,       /*!< 65536 = 262.144us = 3.814697260kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_32768 = 32768,   /*!< 32768 = 131.072us = 7.629394531kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_16384 = 16384,   /*!< 16384 = 65.536us = 15.25878906kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_8192  = 8192,    /*!< 8192 = 32.768us = 30/51757813kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_4096  = 4096,    /*!< 4096 = 16.384us = 61.03515625kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_2048  = 2048,    /*!< 2048 = 8.192us = 122.0703125kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_1024  = 1024,    /*!< 1024 = 4.096us = 244.140625kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_512   = 512,     /*!< 512 = 2.048us = 488.28125kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_256   = 256,     /*!< 256 = 1.024us = 976.5625kHz */
-    BCM2835_SPI_CLOCK_DIVIDER_128   = 128,     /*!< 128 = 512ns = = 1.953125MHz */
-    BCM2835_SPI_CLOCK_DIVIDER_64    = 64,      /*!< 64 = 256ns = 3.90625MHz */
-    BCM2835_SPI_CLOCK_DIVIDER_32    = 32,      /*!< 32 = 128ns = 7.8125MHz */
-    BCM2835_SPI_CLOCK_DIVIDER_16    = 16,      /*!< 16 = 64ns = 15.625MHz */
-    BCM2835_SPI_CLOCK_DIVIDER_8     = 8,       /*!< 8 = 32ns = 31.25MHz */
-    BCM2835_SPI_CLOCK_DIVIDER_4     = 4,       /*!< 4 = 16ns = 62.5MHz */
-    BCM2835_SPI_CLOCK_DIVIDER_2     = 2,       /*!< 2 = 8ns = 125MHz, fastest you can get */
-    BCM2835_SPI_CLOCK_DIVIDER_1     = 1        /*!< 1 = 262.144us = 3.814697260kHz, same as 0/65536 */
+    BCM2835_SPI_CLOCK_DIVIDER_65536 = 0,       /*!< 65536 = 3.814697260kHz on Rpi2, 6.1035156kHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_32768 = 32768,   /*!< 32768 = 7.629394531kHz on Rpi2, 12.20703125kHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_16384 = 16384,   /*!< 16384 = 15.25878906kHz on Rpi2, 24.4140625kHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_8192  = 8192,    /*!< 8192 = 30.51757813kHz on Rpi2, 48.828125kHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_4096  = 4096,    /*!< 4096 = 61.03515625kHz on Rpi2, 97.65625kHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_2048  = 2048,    /*!< 2048 = 122.0703125kHz on Rpi2, 195.3125kHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_1024  = 1024,    /*!< 1024 = 244.140625kHz on Rpi2, 390.625kHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_512   = 512,     /*!< 512 = 488.28125kHz on Rpi2, 781.25kHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_256   = 256,     /*!< 256 = 976.5625kHz on Rpi2, 1.5625MHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_128   = 128,     /*!< 128 = 1.953125MHz on Rpi2, 3.125MHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_64    = 64,      /*!< 64 = 3.90625MHz on Rpi2, 6.250MHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_32    = 32,      /*!< 32 = 7.8125MHz on Rpi2, 12.5MHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_16    = 16,      /*!< 16 = 15.625MHz on Rpi2, 25MHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_8     = 8,       /*!< 8 = 31.25MHz on Rpi2, 50MHz on RPI3 */
+    BCM2835_SPI_CLOCK_DIVIDER_4     = 4,       /*!< 4 = 62.5MHz on Rpi2, 100MHz on RPI3. Dont expect this speed to work reliably. */
+    BCM2835_SPI_CLOCK_DIVIDER_2     = 2,       /*!< 2 = 125MHz on Rpi2, 200MHz on RPI3, fastest you can get. Dont expect this speed to work reliably.*/
+    BCM2835_SPI_CLOCK_DIVIDER_1     = 1        /*!< 1 = 3.814697260kHz on Rpi2, 6.1035156kHz on RPI3, same as 0/65536 */
 } bcm2835SPIClockDivider;
 
 /* Defines for I2C
    GPIO register offsets from BCM2835_BSC*_BASE.
    Offsets into the BSC Peripheral block in bytes per 3.1 BSC Register Map
 */
-#define BCM2835_BSC_C 							0x0000 /*!< BSC Master Control */
+#define BCM2835_BSC_C 			0x0000 /*!< BSC Master Control */
 #define BCM2835_BSC_S 			0x0004 /*!< BSC Master Status */
 #define BCM2835_BSC_DLEN		0x0008 /*!< BSC Master Data Length */
 #define BCM2835_BSC_A 			0x000c /*!< BSC Master Slave Address */
@@ -912,6 +1231,7 @@ typedef enum
 #define BCM2835_BSC_S_TA 		0x00000001 /*!< Transfer Active */
 
 #define BCM2835_BSC_FIFO_SIZE   	16 /*!< BSC FIFO size */
+#define BCM2835_AUX_SPI_FIFO_SIZE       4
 
 /*! \brief bcm2835I2CClockDivider
   Specifies the divider used to generate the I2C clock from the system clock.
@@ -933,9 +1253,71 @@ typedef enum
     BCM2835_I2C_REASON_OK   	     = 0x00,      /*!< Success */
     BCM2835_I2C_REASON_ERROR_NACK    = 0x01,      /*!< Received a NACK */
     BCM2835_I2C_REASON_ERROR_CLKT    = 0x02,      /*!< Received Clock Stretch Timeout */
-    BCM2835_I2C_REASON_ERROR_DATA    = 0x04       /*!< Not all data is sent / received */
+    BCM2835_I2C_REASON_ERROR_DATA    = 0x04,      /*!< Not all data is sent / received */
+    BCM2835_I2C_REASON_ERROR_TIMEOUT = 0x08       /*!< Time out occurred during sending */
+
 } bcm2835I2CReasonCodes;
 
+/* Registers offets from BCM2835_SMI_BASE */
+#define BCM2835_SMI_CS           0          /*! < Control and status register > */
+#define BCM2835_SMI_LENGTH       1          /*! < Transfer length register > */
+#define BCM2835_SMI_ADRS         2          /*! < Transfer address register > */
+#define BCM2835_SMI_DATA         3          /*! < Transfer data register > */
+#define BCM2835_SMI_READ0        4          /*! < Read  settings 0 register > */
+#define BCM2835_SMI_WRITE0       5          /*! < Write settings 0 register > */
+#define BCM2835_SMI_READ1        6          /*! < Read  settings 1 register > */
+#define BCM2835_SMI_WRITE1       7          /*! < Write settings 1 register > */
+#define BCM2835_SMI_READ2        8          /*! < Read  settings 2 register > */
+#define BCM2835_SMI_WRITE2       9          /*! < Write settings 2 register > */
+#define BCM2835_SMI_READ3       10          /*! < Read  settings 3 register > */
+#define BCM2835_SMI_WRITE3      11          /*! < Write settings 3 register > */
+#define BCM2835_SMI_DMAC        12          /*! < DMA control register > */
+#define BCM2835_SMI_DIRCS       13          /*! < Direct control register > */
+#define BCM2835_SMI_DIRADDR     14          /*! < Direct access address register > */
+#define BCM2835_SMI_DIRDATA     15          /*! < Direct access data register > */
+
+/* Register masks for SMI_READ and SMI_WRITE */
+#define BCM2835_SMI_RW_WIDTH_MSK        0xC0000000 /*! < Data width mask > */
+#define BCM2835_SMI_RW_WID8             0x00000000 /*! < Data width 8 bits > */
+#define BCM2835_SMI_RW_WID16            0x40000000 /*! < Data width 16 bits > */
+#define BCM2835_SMI_RW_WID18            0x80000000 /*! < Data width 18 bits > */
+#define BCM2835_SMI_RW_WID9             0xC0000000 /*! < Data width 9 bits > */
+#define BCM2835_SMI_RW_SETUP_MSK        0x3F000000 /*! < Setup cycles (6 bits) > */
+#define BCM2835_SMI_RW_SETUP_LS         24         /*! < Shift for setup cycles > */
+#define BCM2835_SMI_RW_MODE68           0x00800000 /*! < Run cycle motorola mode > */
+#define BCM2835_SMI_RW_MODE80           0x00000000 /*! < Run cycle intel mode > */
+#define BCM2835_SMI_READ_FSETUP         0x00400000 /*! < Read : Setup only for first cycle > */
+#define BCM2835_SMI_WRITE_SWAP          0x00400000 /*! < Write : swap pixel data > */
+#define BCM2835_SMI_RW_HOLD_MSK         0x003F0000 /*! < Hold cycles (6 bits) > */
+#define BCM2835_SMI_RW_HOLD_LS          16         /*! < Shift for hold cycles > */
+#define BCM2835_SMI_RW_PACEALL          0x00008000 /*! < Apply pacing always > */
+#define BCM2835_SMI_RW_PACE_MSK         0x00007F00 /*! < Pace cycles (7 bits) > */
+#define BCM2835_SMI_RW_PACE_LS          8          /*! < Shift for pace cycles > */
+#define BCM2835_SMI_RW_DREQ             0x00000080 /*! < Use DMA req on read/write > */
+#define BCM2835_SMI_RW_STROBE_MSK       0x0000007F /*! < Strobe cycles (7 bits) > */
+#define BCM2835_SMI_RW_STROBE_LS        0          /*! < Shift for strobe cycles > */
+
+/* Registers masks for Direct Access control register */
+#define BCM2835_SMI_DIRCS_ENABLE        0x00000001  /*! < Set to enable SMI. 0 = Read from ext. devices > */
+#define BCM2835_SMI_DIRCS_START         0x00000002  /*! < Initiate SMI transfer > */
+#define BCM2835_SMI_DIRCS_DONE          0x00000004  /*! < Set if transfer has finished / Write to clear flag > */
+#define BCM2835_SMI_DIRCS_WRITE         0x00000008  /*! < 1 = Write to ext. devices > */
+
+/* Registers masks for Direct Access address register */
+#define BCM2835_SMI_DIRADRS_DEV_MSK     0x00000300  /*! < Timing configuration slot >  */
+#define BCM2835_SMI_DIRADRS_DEV_LS      8           /*! < Shift for configuration slot > */
+#define BCM2835_SMI_DIRADRS_DEV0        0x00000000  /*! < Use timing config slot 0 > */
+#define BCM2835_SMI_DIRADRS_DEV1        0x00000100  /*! < Use timing config slot 1 > */
+#define BCM2835_SMI_DIRADRS_DEV2        0x00000200  /*! < Use timing config slot 2 > */
+#define BCM2835_SMI_DIRADRS_DEV3        0x00000300  /*! < Use timing config slot 3 > */
+#define BCM2835_SMI_DIRADRS_MSK         0x0000003F  /*! < Adress bits SA5..SA0 > */
+#define BCM2835_SMI_DIRADRS_LS          0           /*! < Shift for address bits > */
+
+/* SMI clock control registers : defined as offset from bcm2835_clk */
+#define SMICLK_CNTL  (44)  /* = 0xB0 */
+#define SMICLK_DIV   (45)  /* = 0xB4 */
+
+
 /* Defines for ST
    GPIO register offsets from BCM2835_ST_BASE.
    Offsets into the ST Peripheral block in bytes per 12.1 System Timer Registers
@@ -1300,6 +1682,8 @@ extern "C" {
       used with bcm2835_gpio_pudclk() to set the  Pull-up/down resistor for the given pin.
       However, it is usually more convenient to use bcm2835_gpio_set_pud().
       \param[in] pud The desired Pull-up/down mode. One of BCM2835_GPIO_PUD_* from bcm2835PUDControl
+      On the RPI 4, although this function and bcm2835_gpio_pudclk() are supported for backward
+      compatibility, new code should always use bcm2835_gpio_set_pud().
       \sa bcm2835_gpio_set_pud()
     */
     extern void bcm2835_gpio_pud(uint8_t pud);
@@ -1308,17 +1692,23 @@ extern "C" {
       \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin.
       \param[in] on HIGH to clock the value from bcm2835_gpio_pud() into the pin. 
       LOW to remove the clock. 
+      
+      On the RPI 4, although this function and bcm2835_gpio_pud() are supported for backward
+      compatibility, new code should always use bcm2835_gpio_set_pud().
+      
       \sa bcm2835_gpio_set_pud()
     */
     extern void bcm2835_gpio_pudclk(uint8_t pin, uint8_t on);
 
     /*! Reads and returns the Pad Control for the given GPIO group.
+      Caution: requires root access.
       \param[in] group The GPIO pad group number, one of BCM2835_PAD_GROUP_GPIO_*
       \return Mask of bits from BCM2835_PAD_* from \ref bcm2835PadGroup
     */
     extern uint32_t bcm2835_gpio_pad(uint8_t group);
 
     /*! Sets the Pad Control for the given GPIO group.
+      Caution: requires root access.
       \param[in] group The GPIO pad group number, one of BCM2835_PAD_GROUP_GPIO_*
       \param[in] control Mask of bits from BCM2835_PAD_* from \ref bcm2835PadGroup. Note 
       that it is not necessary to include BCM2835_PAD_PASSWRD in the mask as this
@@ -1378,6 +1768,14 @@ extern "C" {
     */
     extern void bcm2835_gpio_set_pud(uint8_t pin, uint8_t pud);
 
+    /*! On the BCM2711 based RPI 4, gets the current Pull-up/down mode for the specified pin.
+      Returns one of BCM2835_GPIO_PUD_* from bcm2835PUDControl.
+      On earlier RPI versions not based on the BCM2711, returns BCM2835_GPIO_PUD_ERROR
+      \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin.
+    */
+    
+    extern uint8_t bcm2835_gpio_get_pud(uint8_t pin);
+
     /*! @}  */
 
     /*! \defgroup spi SPI access
@@ -1403,8 +1801,9 @@ extern "C" {
     extern void bcm2835_spi_end(void);
 
     /*! Sets the SPI bit order
-      NOTE: has no effect. Not supported by SPI0.
-      Defaults to 
+      Set the bit order to be used for transmit and receive. The bcm2835 SPI0 only supports BCM2835_SPI_BIT_ORDER_MSB,
+      so if you select BCM2835_SPI_BIT_ORDER_LSB, the bytes will be reversed in software.
+      The library defaults to BCM2835_SPI_BIT_ORDER_MSB.
       \param[in] order The desired bit order, one of BCM2835_SPI_BIT_ORDER_*, 
       see \ref bcm2835SPIBitOrder
     */
@@ -1417,6 +1816,12 @@ extern "C" {
     */
     extern void bcm2835_spi_setClockDivider(uint16_t divider);
 
+    /*! Sets the SPI clock divider by converting the speed parameter to
+      the equivalent SPI clock divider. ( see \sa bcm2835_spi_setClockDivider)
+      \param[in] speed_hz The desired SPI clock speed in Hz
+    */
+   extern void bcm2835_spi_set_speed_hz(uint32_t speed_hz);
+
     /*! Sets the SPI data mode
       Sets the clock polariy and phase
       \param[in] mode The desired data mode, one of BCM2835_SPI_MODE*, 
@@ -1480,10 +1885,88 @@ extern "C" {
       Asserts the currently selected CS pins (as previously set by bcm2835_spi_chipSelect)
       during the transfer.
       \param[in] buf Buffer of bytes to send.
+      \param[in] len Number of bytes in the buf buffer, and the number of bytes to send
+    */
+    extern void bcm2835_spi_writenb(const char* buf, uint32_t len);
+
+    /*! Transfers half-word to the currently selected SPI slave.
+      Asserts the currently selected CS pins (as previously set by bcm2835_spi_chipSelect)
+      during the transfer.
+      Clocks the 8 bit value out on MOSI, and simultaneously clocks in data from MISO.
+      Uses polled transfer as per section 10.6.1 of the BCM 2835 ARM Peripherls manual
+      \param[in] data The 8 bit data byte to write to MOSI
+      \sa bcm2835_spi_writenb()
+    */
+    extern void bcm2835_spi_write(uint16_t data);
+
+    /*! Start AUX SPI operations.
+      Forces RPi AUX SPI pins P1-38 (MOSI), P1-38 (MISO), P1-40 (CLK) and P1-36 (CE2)
+      to alternate function ALT4, which enables those pins for SPI interface.
+      \return 1 if successful, 0 otherwise (perhaps because you are not running as root)
+    */
+    extern int bcm2835_aux_spi_begin(void);
+
+    /*! End AUX SPI operations.
+       SPI1 pins P1-38 (MOSI), P1-38 (MISO), P1-40 (CLK) and P1-36 (CE2)
+       are returned to their default INPUT behaviour.
+     */
+    extern void bcm2835_aux_spi_end(void);
+
+    /*! Sets the AUX SPI clock divider and therefore the AUX SPI clock speed.
+      \param[in] divider The desired AUX SPI clock divider.
+    */
+    extern void bcm2835_aux_spi_setClockDivider(uint16_t divider);
+
+    /*!
+     * Calculates the input for \sa bcm2835_aux_spi_setClockDivider
+     * @param speed_hz A value between \sa BCM2835_AUX_SPI_CLOCK_MIN and \sa BCM2835_AUX_SPI_CLOCK_MAX
+     * @return Input for \sa bcm2835_aux_spi_setClockDivider
+     */
+    extern uint16_t bcm2835_aux_spi_CalcClockDivider(uint32_t speed_hz);
+
+    /*! Transfers half-word to the AUX SPI slave.
+      Asserts the currently selected CS pins during the transfer.
+      \param[in] data The 8 bit data byte to write to MOSI
+      \return The 16 bit byte simultaneously read from  MISO
+      \sa bcm2835_spi_transfern()
+    */
+    extern void bcm2835_aux_spi_write(uint16_t data);
+
+    /*! Transfers any number of bytes to the AUX SPI slave.
+      Asserts the CE2 pin during the transfer.
+      \param[in] buf Buffer of bytes to send.
       \param[in] len Number of bytes in the tbuf buffer, and the number of bytes to send
     */
-    extern void bcm2835_spi_writenb(char* buf, uint32_t len);
+    extern void bcm2835_aux_spi_writenb(const char *buf, uint32_t len);
 
+    /*! Transfers any number of bytes to and from the AUX SPI slave
+      using bcm2835_aux_spi_transfernb.
+      The returned data from the slave replaces the transmitted data in the buffer.
+      \param[in,out] buf Buffer of bytes to send. Received bytes will replace the contents
+      \param[in] len Number of bytes in the buffer, and the number of bytes to send/received
+      \sa bcm2835_aux_spi_transfer()
+    */
+    extern void bcm2835_aux_spi_transfern(char *buf, uint32_t len);
+
+    /*! Transfers any number of bytes to and from the AUX SPI slave.
+      Asserts the CE2 pin during the transfer.
+      Clocks the len 8 bit bytes out on MOSI, and simultaneously clocks in data from MISO.
+      The data read read from the slave is placed into rbuf. rbuf must be at least len bytes long
+      \param[in] tbuf Buffer of bytes to send.
+      \param[out] rbuf Received bytes will by put in this buffer
+      \param[in] len Number of bytes in the tbuf buffer, and the number of bytes to send/received
+    */
+    extern void bcm2835_aux_spi_transfernb(const char *tbuf, char *rbuf, uint32_t len);
+
+    /*! Transfers one byte to and from the AUX SPI slave.
+      Clocks the 8 bit value out on MOSI, and simultaneously clocks in data from MISO. 
+      Returns the read data byte from the slave.
+      \param[in] value The 8 bit data byte to write to MOSI
+      \return The 8 bit byte simultaneously read from MISO
+      \sa bcm2835_aux_spi_transfern()
+    */
+    extern uint8_t bcm2835_aux_spi_transfer(uint8_t value);
+    
     /*! @} */
 
     /*! \defgroup i2c I2C access
@@ -1573,6 +2056,66 @@ extern "C" {
 
     /*! @} */
 
+    /*! \defgroup smi SMI bus support
+      Allows access to SMI bus
+      @{
+    */
+    /*! Start SMI operations.
+      Forces RPi SMI pins P1-19 (MOSI), P1-21 (MISO), P1-23 (CLK), P1-24 (CE0) and P1-26 (CE1)
+      to alternate function ALT1, which enables those pins for SMI interface.
+      You should call bcm2835_smi_end() when all SMI functions are complete to return the pins to
+      their default functions.
+      Only address bits SA0 to SA3 are available as RPi uses GPIO0 (SA5) and GPIO1 (SA4) for I2C
+      HAT identification EEPROM access
+      \sa  bcm2835_smi_end()
+      \return 1 if successful, 0 otherwise (perhaps because you are not running as root)
+    */
+    extern int bcm2835_smi_begin (void);
+
+    /*! End SMI operations.
+      SMI pins P1-19 (MOSI), P1-21 (MISO), P1-23 (CLK), P1-24 (CE0) and P1-26 (CE1)
+      are returned to their default INPUT behaviour.
+    */
+    extern void bcm2835_smi_end (void);
+
+    /*! Setup SMI bus cycle timing parameters
+    There are four SMI channels for read operation and four channels for write operation
+    Cycles are expressed as multiple of 8ns
+    Note that Pace cycles are not used (no effect on hardware) but they are required for
+    configuration. It is recommended to set this value to 1 (and not 0) to have the
+    smallest cycle in case the hardware would recognize it
+    \param[in] smichannel SMI configuration slot to setup (0 to 3)
+    \param[in] readchannel Set to 1 to configure the read channel (0 = configure write channel)
+    \param[in] setupcycles Time between address assertion on bus and OE/WR signal assertion
+    \param[in] strobecycles Duration of OE/WR signal assertion
+    \param[in] holdcycles Time after OE/WR deassertion before address is deasserted
+    \param[in] pacecycles Time before next SMI bus cycle
+    */
+    extern void bcm2835_smi_set_timing(uint32_t smichannel, uint32_t readchannel,
+                                        uint32_t setupcycles, uint32_t strobecycles,
+                                        uint32_t holdcycles, uint32_t pacecycles);
+
+    /*! Transfers one byte to SMI bus.
+      Uses polled transfer as described in BCM 2835 ARM Peripherals manual
+      \param[in] timingslot SMI configuration slot to use (0 to 3)
+      \param[in] data The data byte to write
+      \param[in] address The address to write to
+      \sa bcm2835_smi_writenb()
+    */
+    extern void bcm2835_smi_write (uint32_t smichannel, uint8_t data, uint32_t address);
+
+    /*! Reads one byte from SMI bus.
+      Uses polled transfer as described in BCM 2835 ARM Peripherals manual
+      \param[in] smichannel SMI configuration slot to use (0 to 3)
+      \param[in] address The address to read from
+      \return value read from SMI bus
+      \sa bcm2835_smi_readnb()
+    */
+    extern uint32_t bcm2835_smi_read (uint32_t smichannel, uint32_t address);
+
+    /*! @} */
+
+    
     /*! \defgroup st System Timer access
       Allows access to and delays using the System Timer Counter.
       @{
@@ -1669,3 +2212,12 @@ Broadcom bcm2835. Contributed by Shahrooz Shahparnia.
   Command line utility for executing gpio commands with the 
   Broadcom bcm2835. Contributed by Shahrooz Shahparnia.
 */
+
+/*! example spimem_test.c
+  Shows how to use the included little library (spiram.c and spiram.h)
+  to read and write SPI RAM chips such as 23K256-I/P
+*/
+
+/*! example smi.c
+  Shows how to use the SMI bus calls. Courtesy Benoit Bouchez.
+*/

src/test.c

@@ -5,11 +5,13 @@
 //
 // Author: Mike McCauley
 // Copyright (C) 2011-2013 Mike McCauley
-// $Id: test.c,v 1.5 2015/03/28 05:27:32 mikem Exp $
+// $Id: test.c,v 1.6 2018/01/16 21:55:07 mikem Exp $
 
 #include <bcm2835.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
 
 int main(int argc, char **argv)
 {

test-driver

@@ -1,9 +1,9 @@
 #! /bin/sh
 # test-driver - basic testsuite driver script.
 
-scriptversion=2012-06-27.10; # UTC
+scriptversion=2018-03-07.03; # UTC
 
-# Copyright (C) 2011-2013 Free Software Foundation, Inc.
+# Copyright (C) 2011-2021 Free Software Foundation, Inc.
 #
 # This program is free software; you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -16,7 +16,7 @@ scriptversion=2012-06-27.10; # UTC
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 # As a special exception to the GNU General Public License, if you
 # distribute this file as part of a program that contains a
@@ -42,15 +42,16 @@ print_usage ()
 {
   cat <<END
 Usage:
-  test-driver --test-name=NAME --log-file=PATH --trs-file=PATH
-              [--expect-failure={yes|no}] [--color-tests={yes|no}]
-              [--enable-hard-errors={yes|no}] [--] TEST-SCRIPT
+  test-driver --test-name NAME --log-file PATH --trs-file PATH
+              [--expect-failure {yes|no}] [--color-tests {yes|no}]
+              [--enable-hard-errors {yes|no}] [--]
+              TEST-SCRIPT [TEST-SCRIPT-ARGUMENTS]
+
 The '--test-name', '--log-file' and '--trs-file' options are mandatory.
+See the GNU Automake documentation for information.
 END
 }
 
-# TODO: better error handling in option parsing (in particular, ensure
-# TODO: $log_file, $trs_file and $test_name are defined).
 test_name= # Used for reporting.
 log_file=  # Where to save the output of the test script.
 trs_file=  # Where to save the metadata of the test run.
@@ -69,10 +70,23 @@ while test $# -gt 0; do
   --enable-hard-errors) enable_hard_errors=$2; shift;;
   --) shift; break;;
   -*) usage_error "invalid option: '$1'";;
+   *) break;;
   esac
   shift
 done
 
+missing_opts=
+test x"$test_name" = x && missing_opts="$missing_opts --test-name"
+test x"$log_file"  = x && missing_opts="$missing_opts --log-file"
+test x"$trs_file"  = x && missing_opts="$missing_opts --trs-file"
+if test x"$missing_opts" != x; then
+  usage_error "the following mandatory options are missing:$missing_opts"
+fi
+
+if test $# -eq 0; then
+  usage_error "missing argument"
+fi
+
 if test $color_tests = yes; then
   # Keep this in sync with 'lib/am/check.am:$(am__tty_colors)'.
   red='' # Red.
@@ -91,14 +105,20 @@ trap "st=130; $do_exit" 2
 trap "st=141; $do_exit" 13
 trap "st=143; $do_exit" 15
 
-# Test script is run here.
-"$@" >$log_file 2>&1
+# Test script is run here. We create the file first, then append to it,
+# to ameliorate tests themselves also writing to the log file. Our tests
+# don't, but others can (automake bug#35762).
+: >"$log_file"
+"$@" >>"$log_file" 2>&1
 estatus=$?
+
 if test $enable_hard_errors = no && test $estatus -eq 99; then
-  estatus=1
+  tweaked_estatus=1
+else
+  tweaked_estatus=$estatus
 fi
 
-case $estatus:$expect_failure in
+case $tweaked_estatus:$expect_failure in
   0:yes) col=$red res=XPASS recheck=yes gcopy=yes;;
   0:*)   col=$grn res=PASS  recheck=no  gcopy=no;;
   77:*)  col=$blu res=SKIP  recheck=no  gcopy=yes;;
@@ -107,6 +127,12 @@ case $estatus:$expect_failure in
   *:*)   col=$red res=FAIL  recheck=yes gcopy=yes;;
 esac
 
+# Report the test outcome and exit status in the logs, so that one can
+# know whether the test passed or failed simply by looking at the '.log'
+# file, without the need of also peaking into the corresponding '.trs'
+# file (automake bug#11814).
+echo "$res $test_name (exit status: $estatus)" >>"$log_file"
+
 # Report outcome to console.
 echo "${col}${res}${std}: $test_name"
 
@@ -119,9 +145,9 @@ echo ":copy-in-global-log: $gcopy" >> $trs_file
 # Local Variables:
 # mode: shell-script
 # sh-indentation: 2
-# eval: (add-hook 'write-file-hooks 'time-stamp)
+# eval: (add-hook 'before-save-hook 'time-stamp)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%:y-%02m-%02d.%02H"
-# time-stamp-time-zone: "UTC"
+# time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End: