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.
 
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+
+  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 \
@@ -11,7 +14,8 @@ examples/i2c/i2c.c \
 examples/gpio/gpio.c \
 examples/spiram/spiram_test.c \
 examples/spiram/spiram.c \
-examples/spiram/spiram.h
+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 1.16.1 from Makefile.am.
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2018 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,
@@ -85,6 +85,7 @@ POST_INSTALL = :
 NORMAL_UNINSTALL = :
 PRE_UNINSTALL = :
 POST_UNINSTALL = :
+@HAVE_DOCS_TRUE@am__append_1 = doc
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/configure.ac
@@ -133,8 +134,8 @@ am__recursive_targets = \
   $(am__extra_recursive_targets)
 AM_RECURSIVE_TARGETS = $(am__recursive_targets:-recursive=) TAGS CTAGS \
 	cscope distdir distdir-am dist dist-all distcheck
-am__tagged_files = $(HEADERS) $(SOURCES) $(TAGS_FILES) \
-	$(LISP)config.h.in
+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.
@@ -151,10 +152,7 @@ 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
@@ -196,6 +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$$'
@@ -211,6 +211,8 @@ CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPPFLAGS = @CPPFLAGS@
+CSCOPE = @CSCOPE@
+CTAGS = @CTAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
@@ -218,6 +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@
@@ -288,7 +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 \
@@ -300,7 +303,8 @@ examples/i2c/i2c.c \
 examples/gpio/gpio.c \
 examples/spiram/spiram_test.c \
 examples/spiram/spiram.c \
-examples/spiram/spiram.h
+examples/spiram/spiram.h \
+examples/smi/smi.c
 
 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-recursive
@@ -460,7 +464,6 @@ 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
 
@@ -544,6 +547,10 @@ 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
@@ -586,6 +593,8 @@ distcheck: dist
 	  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)
@@ -601,7 +610,7 @@ distcheck: dist
 	    $(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 \
@@ -763,7 +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 \

aclocal.m4

@@ -1,6 +1,6 @@
-# generated automatically by aclocal 1.16.1 -*- Autoconf -*-
+# generated automatically by aclocal 1.16.5 -*- Autoconf -*-
 
-# Copyright (C) 1996-2018 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) 2002-2018 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,
@@ -35,7 +35,7 @@ AC_DEFUN([AM_AUTOMAKE_VERSION],
 [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], [1.16.1], [],
+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([1.16.1])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) 2001-2018 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,
@@ -110,7 +110,7 @@ am_aux_dir=`cd "$ac_aux_dir" && pwd`
 
 # AM_COND_IF                                            -*- Autoconf -*-
 
-# Copyright (C) 2008-2018 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,
@@ -147,7 +147,7 @@ fi[]dnl
 
 # AM_CONDITIONAL                                            -*- Autoconf -*-
 
-# Copyright (C) 1997-2018 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,
@@ -178,7 +178,7 @@ AC_CONFIG_COMMANDS_PRE(
 Usually this means the macro was only invoked conditionally.]])
 fi])])
 
-# Copyright (C) 1999-2018 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,
@@ -369,7 +369,7 @@ _AM_SUBST_NOTMAKE([am__nodep])dnl
 
 # Generate code to set up dependency tracking.              -*- Autoconf -*-
 
-# Copyright (C) 1999-2018 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,
@@ -408,7 +408,9 @@ AC_DEFUN([_AM_OUTPUT_DEPENDENCY_COMMANDS],
   done
   if test $am_rc -ne 0; then
     AC_MSG_FAILURE([Something went wrong bootstrapping makefile fragments
-    for automatic dependency tracking.  Try re-running configure with the
+    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
@@ -435,7 +437,7 @@ AC_DEFUN([AM_OUTPUT_DEPENDENCY_COMMANDS],
 
 # Do all the work for Automake.                             -*- Autoconf -*-
 
-# Copyright (C) 1996-2018 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,
@@ -463,6 +465,10 @@ m4_defn([AC_PROG_CC])
 # 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
@@ -499,7 +505,7 @@ m4_ifval([$3], [_AM_SET_OPTION([no-define])])dnl
 [_AM_SET_OPTIONS([$1])dnl
 dnl Diagnose old-style AC_INIT with new-style AM_AUTOMAKE_INIT.
 m4_if(
-  m4_ifdef([AC_PACKAGE_NAME], [ok]):m4_ifdef([AC_PACKAGE_VERSION], [ok]),
+  m4_ifset([AC_PACKAGE_NAME], [ok]):m4_ifset([AC_PACKAGE_VERSION], [ok]),
   [ok:ok],,
   [m4_fatal([AC_INIT should be called with package and version arguments])])dnl
  AC_SUBST([PACKAGE], ['AC_PACKAGE_TARNAME'])dnl
@@ -551,6 +557,20 @@ AC_PROVIDE_IFELSE([AC_PROG_OBJCXX],
 		  [m4_define([AC_PROG_OBJCXX],
 			     m4_defn([AC_PROG_OBJCXX])[_AM_DEPENDENCIES([OBJCXX])])])dnl
 ])
+# Variables for tags utilities; see am/tags.am
+if test -z "$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
@@ -632,7 +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) 2001-2018 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,
@@ -653,7 +673,7 @@ if test x"${install_sh+set}" != xset; then
 fi
 AC_SUBST([install_sh])])
 
-# Copyright (C) 2003-2018 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,
@@ -674,7 +694,7 @@ AC_SUBST([am__leading_dot])])
 
 # Check to see how 'make' treats includes.	            -*- Autoconf -*-
 
-# Copyright (C) 2001-2018 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,
@@ -717,7 +737,7 @@ AC_SUBST([am__quote])])
 
 # Fake the existence of programs that GNU maintainers use.  -*- Autoconf -*-
 
-# Copyright (C) 1997-2018 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,
@@ -738,12 +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
@@ -754,38 +769,9 @@ else
 fi
 ])
 
-#  -*- Autoconf -*-
-# Obsolete and "removed" macros, that must however still report explicit
-# error messages when used, to smooth transition.
-#
-# Copyright (C) 1996-2018 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) 2001-2018 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,
@@ -814,7 +800,7 @@ AC_DEFUN([_AM_SET_OPTIONS],
 AC_DEFUN([_AM_IF_OPTION],
 [m4_ifset(_AM_MANGLE_OPTION([$1]), [$2], [$3])])
 
-# Copyright (C) 1999-2018 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,
@@ -861,7 +847,7 @@ AC_LANG_POP([C])])
 # For backward compatibility.
 AC_DEFUN_ONCE([AM_PROG_CC_C_O], [AC_REQUIRE([AC_PROG_CC])])
 
-# Copyright (C) 2001-2018 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,
@@ -880,7 +866,7 @@ AC_DEFUN([AM_RUN_LOG],
 
 # Check to make sure that the build environment is sane.    -*- Autoconf -*-
 
-# Copyright (C) 1996-2018 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,
@@ -961,7 +947,7 @@ AC_CONFIG_COMMANDS_PRE(
 rm -f conftest.file
 ])
 
-# Copyright (C) 2009-2018 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,
@@ -1021,7 +1007,7 @@ AC_SUBST([AM_BACKSLASH])dnl
 _AM_SUBST_NOTMAKE([AM_BACKSLASH])dnl
 ])
 
-# Copyright (C) 2001-2018 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,
@@ -1049,7 +1035,7 @@ fi
 INSTALL_STRIP_PROGRAM="\$(install_sh) -c -s"
 AC_SUBST([INSTALL_STRIP_PROGRAM])])
 
-# Copyright (C) 2006-2018 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,
@@ -1068,7 +1054,7 @@ AC_DEFUN([AM_SUBST_NOTMAKE], [_AM_SUBST_NOTMAKE($@)])
 
 # Check how to create a tarball.                            -*- Autoconf -*-
 
-# Copyright (C) 2004-2018 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

@@ -3,7 +3,7 @@
 
 scriptversion=2018-03-07.03; # UTC
 
-# Copyright (C) 1999-2018 Free Software Foundation, Inc.
+# 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
@@ -53,7 +53,7 @@ func_file_conv ()
 	  MINGW*)
 	    file_conv=mingw
 	    ;;
-	  CYGWIN*)
+	  CYGWIN* | MSYS*)
 	    file_conv=cygwin
 	    ;;
 	  *)
@@ -67,7 +67,7 @@ func_file_conv ()
 	mingw/*)
 	  file=`cmd //C echo "$file " | sed -e 's/"\(.*\) " *$/\1/'`
 	  ;;
-	cygwin/*)
+	cygwin/* | msys/*)
 	  file=`cygpath -m "$file" || echo "$file"`
 	  ;;
 	wine/*)

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], [1.62], [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 1.16.1 from Makefile.am.
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2018 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,
@@ -128,6 +128,8 @@ CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPPFLAGS = @CPPFLAGS@
+CSCOPE = @CSCOPE@
+CTAGS = @CTAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
@@ -135,6 +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@
@@ -245,7 +248,6 @@ ctags CTAGS:
 
 cscope cscopelist:
 
-
 distdir: $(BUILT_SOURCES)
 	$(MAKE) $(AM_MAKEFLAGS) distdir-am
 

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;
+}

src/Makefile.in

@@ -1,7 +1,7 @@
-# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# Makefile.in generated by automake 1.16.5 from Makefile.am.
 # @configure_input@
 
-# Copyright (C) 1994-2018 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,
@@ -195,8 +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 | $(am__uniquify_input)`
-ETAGS = etags
-CTAGS = ctags
 am__tty_colors_dummy = \
   mgn= red= grn= lgn= blu= brg= std=; \
   am__color_tests=no
@@ -352,6 +350,7 @@ am__set_TESTS_bases = \
   bases='$(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
@@ -388,6 +387,8 @@ CC = @CC@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPPFLAGS = @CPPFLAGS@
+CSCOPE = @CSCOPE@
+CTAGS = @CTAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
@@ -395,6 +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@
@@ -757,7 +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";						\
@@ -812,7 +814,6 @@ 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
 

src/bcm2835.c

@@ -6,8 +6,12 @@
 // Author: Mike McCauley
 // Copyright (C) 2011-2013 Mike McCauley
 // $Id: bcm2835.c,v 1.28 2020/01/11 05:07:13 mikem Exp mikem $
+//
+// S.Peacock: modified bcm2835_i2c_write() to add a fail safe timer.
 */
 
+// Needed to compile with gcc -std=c99, as reported by John Blaiklock.
+#define _POSIX_C_SOURCE 200809L
 
 #include <stdlib.h>
 #include <stdio.h>
@@ -57,6 +61,8 @@ volatile uint32_t *bcm2835_bsc1        = (uint32_t *)MAP_FAILED;
 volatile uint32_t *bcm2835_st	       = (uint32_t *)MAP_FAILED;
 volatile uint32_t *bcm2835_aux	       = (uint32_t *)MAP_FAILED;
 volatile uint32_t *bcm2835_spi1        = (uint32_t *)MAP_FAILED;
+/* BEB*/
+volatile uint32_t *bcm2835_smi         = (uint32_t *)MAP_FAILED;
 
 
 
@@ -126,6 +132,23 @@ static uint8_t bcm2835_correct_order(uint8_t b)
 	return b;
 }
 
+#ifdef BCM2835_HAVE_LIBCAP
+#include <sys/capability.h>
+static int bcm2835_has_capability(cap_value_t capability)
+{
+    int ok = 0;
+    cap_t cap = cap_get_proc();
+    if (cap)
+    {
+        cap_flag_value_t value;
+        if (cap_get_flag(cap,capability,CAP_EFFECTIVE,&value) == 0 && value == CAP_SET)
+            ok = 1;
+       cap_free(cap);
+    }
+    return ok;
+}
+#endif
+
 /*
 // Low level register access functions
 */
@@ -155,6 +178,10 @@ uint32_t* bcm2835_regbase(uint8_t regbase)
 	    return (uint32_t *)bcm2835_aux;
 	case BCM2835_REGBASE_SPI1:
 	    return (uint32_t *)bcm2835_spi1;
+        /* BEB */
+        case BCM2835_REGBASE_SMI:
+	    return (uint32_t *)bcm2835_smi;
+
 
     }
     return (uint32_t *)MAP_FAILED;
@@ -442,6 +469,7 @@ void bcm2835_gpio_afen(uint8_t pin)
     uint32_t value = 1 << shift;
     bcm2835_peri_set_bits(paddr, value, value);
 }
+
 void bcm2835_gpio_clr_afen(uint8_t pin)
 {
     volatile uint32_t* paddr = bcm2835_gpio + BCM2835_GPAFEN0/4 + pin/32;
@@ -453,14 +481,15 @@ void bcm2835_gpio_clr_afen(uint8_t pin)
 /* Set pullup/down */
 void bcm2835_gpio_pud(uint8_t pud)
 {
-    if( pud_type_rpi4 )
+    if (pud_type_rpi4)
     {
         pud_compat_setting = pud;
     }
-    else {
-    volatile uint32_t* paddr = bcm2835_gpio + BCM2835_GPPUD/4;
-    bcm2835_peri_write(paddr, pud);
-}
+    else
+    {
+	volatile uint32_t* paddr = bcm2835_gpio + BCM2835_GPPUD/4;
+	bcm2835_peri_write(paddr, pud);
+    }
 }
 
 /* Pullup/down clock
@@ -468,24 +497,24 @@ void bcm2835_gpio_pud(uint8_t pud)
 */
 void bcm2835_gpio_pudclk(uint8_t pin, uint8_t on)
 {
-    if( pud_type_rpi4 )
+    if (pud_type_rpi4)
     {
-        if( on )
-            bcm2835_gpio_set_pud( pin, pud_compat_setting);
-    }
+        if (on)
+             bcm2835_gpio_set_pud( pin, pud_compat_setting);
+    } 
     else
-    {
-    volatile uint32_t* paddr = bcm2835_gpio + BCM2835_GPPUDCLK0/4 + pin/32;
-    uint8_t shift = pin % 32;
-    bcm2835_peri_write(paddr, (on ? 1 : 0) << shift);
-}
+    { 
+	volatile uint32_t* paddr = bcm2835_gpio + BCM2835_GPPUDCLK0/4 + pin/32;
+	uint8_t shift = pin % 32;
+	bcm2835_peri_write(paddr, (on ? 1 : 0) << shift);
+    }
 }
 
 /* Read GPIO pad behaviour for groups of GPIOs */
 uint32_t bcm2835_gpio_pad(uint8_t group)
 {
-  if (bcm2835_pads == MAP_FAILED)
-    return 0;
+    if (bcm2835_pads == MAP_FAILED)
+	return 0;
   
     volatile uint32_t* paddr = bcm2835_pads + BCM2835_PADS_GPIO_0_27/4 + group;
     return bcm2835_peri_read(paddr);
@@ -497,8 +526,8 @@ uint32_t bcm2835_gpio_pad(uint8_t group)
 */
 void bcm2835_gpio_set_pad(uint8_t group, uint32_t control)
 {
-  if (bcm2835_pads == MAP_FAILED)
-    return;
+    if (bcm2835_pads == MAP_FAILED)
+	return;
   
     volatile uint32_t* paddr = bcm2835_pads + BCM2835_PADS_GPIO_0_27/4 + group;
     bcm2835_peri_write(paddr, control | BCM2835_PAD_PASSWRD);
@@ -535,7 +564,7 @@ void bcm2835_delayMicroseconds(uint64_t micros)
     start =  bcm2835_st_read();
    
     /* Not allowed to access timer registers (result is not as precise)*/
-    if (start==0)
+    if (start == 0)
     {
 	t1.tv_sec = 0;
 	t1.tv_nsec = 1000 * (long)(micros);
@@ -605,7 +634,7 @@ void bcm2835_gpio_write_mask(uint32_t value, uint32_t mask)
 */
 void bcm2835_gpio_set_pud(uint8_t pin, uint8_t pud)
 {
-    if( pud_type_rpi4 )
+    if (pud_type_rpi4)
     {
         int shiftbits = (pin & 0xf) << 1;
         uint32_t bits;
@@ -627,16 +656,16 @@ void bcm2835_gpio_set_pud(uint8_t pin, uint8_t pud)
         
         bcm2835_peri_write_nb( paddr, bits );
         
-    } else
+    }
+    else
     {
-    bcm2835_gpio_pud(pud);
-    delayMicroseconds(10);
-    bcm2835_gpio_pudclk(pin, 1);
-    delayMicroseconds(10);
-    bcm2835_gpio_pud(BCM2835_GPIO_PUD_OFF);
-    bcm2835_gpio_pudclk(pin, 0);
-}
-
+	bcm2835_gpio_pud(pud);
+	delayMicroseconds(10);
+	bcm2835_gpio_pudclk(pin, 1);
+	delayMicroseconds(10);
+	bcm2835_gpio_pud(BCM2835_GPIO_PUD_OFF);
+	bcm2835_gpio_pudclk(pin, 0);
+    }
 }
 
 
@@ -644,7 +673,7 @@ uint8_t bcm2835_gpio_get_pud(uint8_t pin)
 {
     uint8_t ret = BCM2835_GPIO_PUD_ERROR;
     
-    if( pud_type_rpi4 )
+    if (pud_type_rpi4)
     {
         uint32_t bits;
         volatile uint32_t* paddr = bcm2835_gpio + BCM2835_GPPUPPDN0/4 + (pin >> 4);
@@ -662,6 +691,14 @@ uint8_t bcm2835_gpio_get_pud(uint8_t pin)
     return ret;
 }
 
+static void bcm2835_aux_spi_reset(void)
+ {
+     volatile uint32_t* cntl0 = bcm2835_spi1 + BCM2835_AUX_SPI_CNTL0/4;
+     volatile uint32_t* cntl1 = bcm2835_spi1 + BCM2835_AUX_SPI_CNTL1/4;
+ 
+     bcm2835_peri_write(cntl1, 0);
+     bcm2835_peri_write(cntl0, BCM2835_AUX_SPI_CNTL0_CLEARFIFO);
+}
 
 int bcm2835_spi_begin(void)
 {
@@ -715,9 +752,9 @@ void bcm2835_spi_setClockDivider(uint16_t divider)
 
 void bcm2835_spi_set_speed_hz(uint32_t speed_hz)
 {
-	uint16_t divider = (uint16_t) ((uint32_t) BCM2835_CORE_CLK_HZ / speed_hz);
-	divider &= 0xFFFE;
-	bcm2835_spi_setClockDivider(divider);
+    uint16_t divider = (uint16_t) ((uint32_t) BCM2835_CORE_CLK_HZ / speed_hz);
+    divider &= 0xFFFE;
+    bcm2835_spi_setClockDivider(divider);
 }
 
 void bcm2835_spi_setDataMode(uint8_t mode)
@@ -917,58 +954,58 @@ int bcm2835_aux_spi_begin(void)
     volatile uint32_t* cntl1 = bcm2835_spi1 + BCM2835_AUX_SPI_CNTL1/4;
 
     if (bcm2835_spi1 == MAP_FAILED)
-      return 0; /* bcm2835_init() failed, or not root */
+	return 0; /* bcm2835_init() failed, or not root */
 
     /* Set the SPI pins to the Alt 4 function to enable SPI1 access on them */
-	bcm2835_gpio_fsel(RPI_V2_GPIO_P1_36, BCM2835_GPIO_FSEL_ALT4);	/* SPI1_CE2_N */
-	bcm2835_gpio_fsel(RPI_V2_GPIO_P1_35, BCM2835_GPIO_FSEL_ALT4);	/* SPI1_MISO */
-	bcm2835_gpio_fsel(RPI_V2_GPIO_P1_38, BCM2835_GPIO_FSEL_ALT4);	/* SPI1_MOSI */
-	bcm2835_gpio_fsel(RPI_V2_GPIO_P1_40, BCM2835_GPIO_FSEL_ALT4);	/* SPI1_SCLK */
+    bcm2835_gpio_fsel(RPI_V2_GPIO_P1_36, BCM2835_GPIO_FSEL_ALT4);	/* SPI1_CE2_N */
+    bcm2835_gpio_fsel(RPI_V2_GPIO_P1_35, BCM2835_GPIO_FSEL_ALT4);	/* SPI1_MISO */
+    bcm2835_gpio_fsel(RPI_V2_GPIO_P1_38, BCM2835_GPIO_FSEL_ALT4);	/* SPI1_MOSI */
+    bcm2835_gpio_fsel(RPI_V2_GPIO_P1_40, BCM2835_GPIO_FSEL_ALT4);	/* SPI1_SCLK */
 
-	bcm2835_aux_spi_setClockDivider(bcm2835_aux_spi_CalcClockDivider(1000000));	// Default 1MHz SPI
+    bcm2835_aux_spi_setClockDivider(bcm2835_aux_spi_CalcClockDivider(1000000));	// Default 1MHz SPI
 
-	bcm2835_peri_write(enable, BCM2835_AUX_ENABLE_SPI0);
-	bcm2835_peri_write(cntl1, 0);
-	bcm2835_peri_write(cntl0, BCM2835_AUX_SPI_CNTL0_CLEARFIFO);
+    bcm2835_peri_write(enable, BCM2835_AUX_ENABLE_SPI0);
+    bcm2835_peri_write(cntl1, 0);
+    bcm2835_peri_write(cntl0, BCM2835_AUX_SPI_CNTL0_CLEARFIFO);
 
     return 1; /* OK */
 }
 
 void bcm2835_aux_spi_end(void)
 {
-	/* Set all the SPI1 pins back to input */
-	bcm2835_gpio_fsel(RPI_V2_GPIO_P1_36, BCM2835_GPIO_FSEL_INPT);	/* SPI1_CE2_N */
-	bcm2835_gpio_fsel(RPI_V2_GPIO_P1_35, BCM2835_GPIO_FSEL_INPT);	/* SPI1_MISO */
-	bcm2835_gpio_fsel(RPI_V2_GPIO_P1_38, BCM2835_GPIO_FSEL_INPT);	/* SPI1_MOSI */
-	bcm2835_gpio_fsel(RPI_V2_GPIO_P1_40, BCM2835_GPIO_FSEL_INPT);	/* SPI1_SCLK */
+    /* Set all the SPI1 pins back to input */
+    bcm2835_gpio_fsel(RPI_V2_GPIO_P1_36, BCM2835_GPIO_FSEL_INPT);	/* SPI1_CE2_N */
+    bcm2835_gpio_fsel(RPI_V2_GPIO_P1_35, BCM2835_GPIO_FSEL_INPT);	/* SPI1_MISO */
+    bcm2835_gpio_fsel(RPI_V2_GPIO_P1_38, BCM2835_GPIO_FSEL_INPT);	/* SPI1_MOSI */
+    bcm2835_gpio_fsel(RPI_V2_GPIO_P1_40, BCM2835_GPIO_FSEL_INPT);	/* SPI1_SCLK */
 }
 
 #define DIV_ROUND_UP(n,d)	(((n) + (d) - 1) / (d))
 
 uint16_t bcm2835_aux_spi_CalcClockDivider(uint32_t speed_hz)
 {
-	uint16_t divider;
+    uint16_t divider;
 
-	if (speed_hz < (uint32_t) BCM2835_AUX_SPI_CLOCK_MIN) {
-		speed_hz = (uint32_t) BCM2835_AUX_SPI_CLOCK_MIN;
-	} else if (speed_hz > (uint32_t) BCM2835_AUX_SPI_CLOCK_MAX) {
-		speed_hz = (uint32_t) BCM2835_AUX_SPI_CLOCK_MAX;
-	}
+    if (speed_hz < (uint32_t) BCM2835_AUX_SPI_CLOCK_MIN) {
+	speed_hz = (uint32_t) BCM2835_AUX_SPI_CLOCK_MIN;
+    } else if (speed_hz > (uint32_t) BCM2835_AUX_SPI_CLOCK_MAX) {
+	speed_hz = (uint32_t) BCM2835_AUX_SPI_CLOCK_MAX;
+    }
 
-	divider = (uint16_t) DIV_ROUND_UP(BCM2835_CORE_CLK_HZ, 2 * speed_hz) - 1;
+    divider = (uint16_t) DIV_ROUND_UP(BCM2835_CORE_CLK_HZ, 2 * speed_hz) - 1;
 
-	if (divider > (uint16_t) BCM2835_AUX_SPI_CNTL0_SPEED_MAX) {
-		return (uint16_t) BCM2835_AUX_SPI_CNTL0_SPEED_MAX;
-	}
+    if (divider > (uint16_t) BCM2835_AUX_SPI_CNTL0_SPEED_MAX) {
+	return (uint16_t) BCM2835_AUX_SPI_CNTL0_SPEED_MAX;
+    }
 
-	return divider;
+    return divider;
 }
 
 static uint32_t spi1_speed;
 
 void bcm2835_aux_spi_setClockDivider(uint16_t divider)
 {
-		spi1_speed = (uint32_t) divider;
+    spi1_speed = (uint32_t) divider;
 }
 
 void bcm2835_aux_spi_write(uint16_t data)
@@ -978,19 +1015,19 @@ void bcm2835_aux_spi_write(uint16_t data)
     volatile uint32_t* stat = bcm2835_spi1 + BCM2835_AUX_SPI_STAT/4;
     volatile uint32_t* io = bcm2835_spi1 + BCM2835_AUX_SPI_IO/4;
 
-	uint32_t _cntl0 = (spi1_speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT);
-	_cntl0 |= BCM2835_AUX_SPI_CNTL0_CS2_N;
-	_cntl0 |= BCM2835_AUX_SPI_CNTL0_ENABLE;
-	_cntl0 |= BCM2835_AUX_SPI_CNTL0_MSBF_OUT;
-	_cntl0 |= 16; // Shift length
+    uint32_t _cntl0 = (spi1_speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT);
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_CS2_N;
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_ENABLE;
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_MSBF_OUT;
+    _cntl0 |= 16; // Shift length
 
-	bcm2835_peri_write(cntl0, _cntl0);
-	bcm2835_peri_write(cntl1, BCM2835_AUX_SPI_CNTL1_MSBF_IN);
+    bcm2835_peri_write(cntl0, _cntl0);
+    bcm2835_peri_write(cntl1, BCM2835_AUX_SPI_CNTL1_MSBF_IN);
 
-	while (bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_TX_FULL)
-		;
+    while (bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_TX_FULL)
+	;
 
-	bcm2835_peri_write(io, (uint32_t) data << 16);
+    bcm2835_peri_write(io, (uint32_t) data << 16);
 }
 
 void bcm2835_aux_spi_writenb(const char *tbuf, uint32_t len) {
@@ -1000,49 +1037,49 @@ void bcm2835_aux_spi_writenb(const char *tbuf, uint32_t len) {
     volatile uint32_t* txhold = bcm2835_spi1 + BCM2835_AUX_SPI_TXHOLD/4;
     volatile uint32_t* io = bcm2835_spi1 + BCM2835_AUX_SPI_IO/4;
 
-	char *tx = (char *) tbuf;
-	uint32_t tx_len = len;
-	uint32_t count;
-	uint32_t data;
-	uint32_t i;
-	uint8_t byte;
+    char *tx = (char *) tbuf;
+    uint32_t tx_len = len;
+    uint32_t count;
+    uint32_t data;
+    uint32_t i;
+    uint8_t byte;
 
-	uint32_t _cntl0 = (spi1_speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT);
-	_cntl0 |= BCM2835_AUX_SPI_CNTL0_CS2_N;
-	_cntl0 |= BCM2835_AUX_SPI_CNTL0_ENABLE;
-	_cntl0 |= BCM2835_AUX_SPI_CNTL0_MSBF_OUT;
-	_cntl0 |= BCM2835_AUX_SPI_CNTL0_VAR_WIDTH;
+    uint32_t _cntl0 = (spi1_speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT);
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_CS2_N;
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_ENABLE;
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_MSBF_OUT;
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_VAR_WIDTH;
 
-	bcm2835_peri_write(cntl0, _cntl0);
-	bcm2835_peri_write(cntl1, BCM2835_AUX_SPI_CNTL1_MSBF_IN);
+    bcm2835_peri_write(cntl0, _cntl0);
+    bcm2835_peri_write(cntl1, BCM2835_AUX_SPI_CNTL1_MSBF_IN);
 
-	while (tx_len > 0) {
+    while (tx_len > 0) {
 
-		while (bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_TX_FULL)
-			;
+	while (bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_TX_FULL)
+	    ;
 
-		count = MIN(tx_len, 3);
-		data = 0;
+	count = MIN(tx_len, 3);
+	data = 0;
 
-		for (i = 0; i < count; i++) {
-			byte = (tx != NULL) ? (uint8_t) *tx++ : (uint8_t) 0;
-			data |= byte << (8 * (2 - i));
-		}
-
-		data |= (count * 8) << 24;
-		tx_len -= count;
-
-		if (tx_len != 0) {
-			bcm2835_peri_write(txhold, data);
-		} else {
-			bcm2835_peri_write(io, data);
-		}
-
-		while (bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_BUSY)
-			;
-
-		(void) bcm2835_peri_read(io);
+	for (i = 0; i < count; i++) {
+	    byte = (tx != NULL) ? (uint8_t) *tx++ : (uint8_t) 0;
+	    data |= byte << (8 * (2 - i));
 	}
+
+	data |= (count * 8) << 24;
+	tx_len -= count;
+
+	if (tx_len != 0) {
+	    bcm2835_peri_write(txhold, data);
+	} else {
+	    bcm2835_peri_write(io, data);
+	}
+
+	while (bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_BUSY)
+	    ;
+
+	(void) bcm2835_peri_read(io);
+    }
 }
 
 void bcm2835_aux_spi_transfernb(const char *tbuf, char *rbuf, uint32_t len) {
@@ -1072,7 +1109,8 @@ void bcm2835_aux_spi_transfernb(const char *tbuf, char *rbuf, uint32_t len) {
 
 	while ((tx_len > 0) || (rx_len > 0)) {
 
-		while (!(bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_TX_FULL) && (tx_len > 0)) {
+	    while (!(bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_TX_FULL) && (tx_len > 0) && (tx_len + BCM2835_AUX_SPI_FIFO_SIZE * 3 > rx_len))
+	    {
 			count = MIN(tx_len, 3);
 			data = 0;
 
@@ -1092,7 +1130,8 @@ void bcm2835_aux_spi_transfernb(const char *tbuf, char *rbuf, uint32_t len) {
 
 		}
 
-		while (!(bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_RX_EMPTY) && (rx_len > 0)) {
+		while (!(bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_RX_EMPTY) && (rx_len > 0))
+		{
 			count = MIN(rx_len, 3);
 			data = bcm2835_peri_read(io);
 
@@ -1114,7 +1153,8 @@ void bcm2835_aux_spi_transfernb(const char *tbuf, char *rbuf, uint32_t len) {
 			rx_len -= count;
 		}
 
-		while (!(bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_BUSY) && (rx_len > 0)) {
+		while (!(bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_BUSY) && (rx_len > 0) && (tx_len == 0))
+		{
 			count = MIN(rx_len, 3);
 			data = bcm2835_peri_read(io);
 
@@ -1142,6 +1182,41 @@ void bcm2835_aux_spi_transfern(char *buf, uint32_t len) {
 	bcm2835_aux_spi_transfernb(buf, buf, len);
 }
 
+/* Writes (and reads) a single byte to AUX SPI */
+uint8_t bcm2835_aux_spi_transfer(uint8_t value)
+{
+    volatile uint32_t* cntl0 = bcm2835_spi1 + BCM2835_AUX_SPI_CNTL0/4;
+    volatile uint32_t* cntl1 = bcm2835_spi1 + BCM2835_AUX_SPI_CNTL1/4;
+    volatile uint32_t* stat = bcm2835_spi1 + BCM2835_AUX_SPI_STAT/4;
+    volatile uint32_t* io = bcm2835_spi1 + BCM2835_AUX_SPI_IO/4;
+
+    uint32_t data;
+
+    uint32_t _cntl0 = (spi1_speed << BCM2835_AUX_SPI_CNTL0_SPEED_SHIFT);
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_CS2_N;
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_ENABLE;
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_MSBF_OUT;
+    _cntl0 |= BCM2835_AUX_SPI_CNTL0_CPHA_IN;
+    _cntl0 |= 8; // Shift length.
+
+    uint32_t _cntl1 = BCM2835_AUX_SPI_CNTL1_MSBF_IN;
+
+    bcm2835_peri_write(cntl1, _cntl1);
+    bcm2835_peri_write(cntl0, _cntl0);
+
+    bcm2835_peri_write(io, (uint32_t) bcm2835_correct_order(value) << 24);
+
+    while (bcm2835_peri_read(stat) & BCM2835_AUX_SPI_STAT_BUSY)
+        ;
+
+    data = bcm2835_correct_order(bcm2835_peri_read(io) & 0xff);
+
+    bcm2835_aux_spi_reset();
+
+    return data;
+}
+
+
 int bcm2835_i2c_begin(void)
 {
     uint16_t cdiv;
@@ -1240,10 +1315,12 @@ uint8_t bcm2835_i2c_write(const char * buf, uint32_t len)
     volatile uint32_t* control = bcm2835_bsc1 + BCM2835_BSC_C/4;
 #endif    
 
-    uint32_t remaining = len;
-    uint32_t i = 0;
-    uint8_t reason = BCM2835_I2C_REASON_OK;
-
+    uint32_t      remaining = len;
+    uint32_t      i = 0;
+    uint8_t       reason = BCM2835_I2C_REASON_OK;
+    unsigned long Failsafe = len * 10000;
+    int           Timeout = 0;
+    
     /* Clear FIFO */
     bcm2835_peri_set_bits(control, BCM2835_BSC_C_CLEAR_1 , BCM2835_BSC_C_CLEAR_1 );
     /* Clear Status */
@@ -1262,29 +1339,45 @@ uint8_t bcm2835_i2c_write(const char * buf, uint32_t len)
     bcm2835_peri_write(control, BCM2835_BSC_C_I2CEN | BCM2835_BSC_C_ST);
     
     /* Transfer is over when BCM2835_BSC_S_DONE */
-    while(!(bcm2835_peri_read(status) & BCM2835_BSC_S_DONE ))
+    while(!Timeout && !(bcm2835_peri_read(status) & BCM2835_BSC_S_DONE ))
     {
-        while ( remaining && (bcm2835_peri_read(status) & BCM2835_BSC_S_TXD ))
+        while (!Timeout && remaining && (bcm2835_peri_read(status) & BCM2835_BSC_S_TXD ))
     	{
 	    /* Write to FIFO */
 	    bcm2835_peri_write(fifo, buf[i]);
 	    i++;
 	    remaining--;
+            /* Make sure we don't loop forever! */
+ 	    if (--Failsafe == 0)
+ 	    {
+ 		Timeout = 1;
+ 		break;
+ 	    }
     	}
+        /* Make sure we don't loop forever! */
+         if (--Failsafe == 0)
+ 	{
+ 	    Timeout = 1;
+ 	    break;
+ 	}
+     /* printf("Failsafe %d %d\n", len, (len * 1000) - Failsafe); */
     }
 
-    /* Received a NACK */
-    if (bcm2835_peri_read(status) & BCM2835_BSC_S_ERR)
+    if (Timeout)
     {
+	/* We had a timeout */
+	reason = BCM2835_I2C_REASON_ERROR_TIMEOUT;
+    }
+    else if (bcm2835_peri_read(status) & BCM2835_BSC_S_ERR)
+    {
+	/* Received a NACK */
 	reason = BCM2835_I2C_REASON_ERROR_NACK;
     }
-
     /* Received Clock Stretch Timeout */
     else if (bcm2835_peri_read(status) & BCM2835_BSC_S_CLKT)
     {
 	reason = BCM2835_I2C_REASON_ERROR_CLKT;
     }
-
     /* Not all data is sent */
     else if (remaining)
     {
@@ -1364,7 +1457,7 @@ uint8_t bcm2835_i2c_read(char* buf, uint32_t len)
 	reason = BCM2835_I2C_REASON_ERROR_DATA;
     }
 
-    bcm2835_peri_set_bits(control, BCM2835_BSC_S_DONE , BCM2835_BSC_S_DONE);
+    bcm2835_peri_set_bits(status, BCM2835_BSC_S_DONE , BCM2835_BSC_S_DONE);
 
     return reason;
 }
@@ -1564,6 +1657,201 @@ uint8_t bcm2835_i2c_write_read_rs(char* cmds, uint32_t cmds_len, char* buf, uint
     return reason;
 }
 
+/* SMI support courtesy Benoit Bouchez */
+int bcm2835_smi_begin(void)
+{
+    volatile uint32_t* paddr;
+    uint32_t defConfig;
+
+    if (bcm2835_smi == MAP_FAILED)
+      return 0; /* bcm2835_smi_init() failed, or not root */
+
+    /* Set the SMI pins to the Alt 1 function to enable SMI access on them */
+    bcm2835_gpio_fsel(2, BCM2835_GPIO_FSEL_ALT1); /* SA3 */
+    bcm2835_gpio_fsel(3, BCM2835_GPIO_FSEL_ALT1); /* SA2 */
+    bcm2835_gpio_fsel(4, BCM2835_GPIO_FSEL_ALT1); /* SA1 */
+    bcm2835_gpio_fsel(5, BCM2835_GPIO_FSEL_ALT1); /* SA0 */
+    bcm2835_gpio_fsel(6, BCM2835_GPIO_FSEL_ALT1); /* SOE_N / SE */
+    bcm2835_gpio_fsel(7, BCM2835_GPIO_FSEL_ALT1); /* SWE_N / SRW_N */
+    bcm2835_gpio_fsel(8, BCM2835_GPIO_FSEL_ALT1); /* SD0 */
+    bcm2835_gpio_fsel(9, BCM2835_GPIO_FSEL_ALT1); /* SD1 */
+    bcm2835_gpio_fsel(10, BCM2835_GPIO_FSEL_ALT1); /* SD2 */
+    bcm2835_gpio_fsel(11, BCM2835_GPIO_FSEL_ALT1); /* SD3 */
+    bcm2835_gpio_fsel(12, BCM2835_GPIO_FSEL_ALT1); /* SD4 */
+    bcm2835_gpio_fsel(13, BCM2835_GPIO_FSEL_ALT1); /* SD5 */
+    bcm2835_gpio_fsel(14, BCM2835_GPIO_FSEL_ALT1); /* SD6 */
+    bcm2835_gpio_fsel(15, BCM2835_GPIO_FSEL_ALT1); /* SD7 */
+
+    /* Set the SMI clock to 125MHz -> one clock period lasts 8 ns */
+    paddr = bcm2835_clk + SMICLK_CNTL;
+    bcm2835_peri_write (paddr, 0x5A000000);     /* Disable SMI clock */
+    paddr = bcm2835_clk + SMICLK_DIV;
+    bcm2835_peri_write (paddr, 0x5A004000);     /* Set clock divider to 4 */
+    paddr = bcm2835_clk + SMICLK_CNTL;
+    bcm2835_peri_write (paddr, 0x5A000016);     /* Enable SMI clock with PLLD */
+
+    /* Set a default useable configuration for the four SMI config slots */
+    /* 8 bits, Intel mode, always pace, 10 clocks for R/W setup = 80 ns
+     20 clocks for R/W strobe = 160 ns, 20 clocks for R/W hold = 160 ns,
+     1 clock for pace control (not used but a value is needed) */
+    defConfig = BCM2835_SMI_RW_WID8 | BCM2835_SMI_RW_MODE80  |
+             BCM2835_SMI_RW_PACEALL | (10<<BCM2835_SMI_RW_SETUP_LS) |
+             (20<<BCM2835_SMI_RW_STROBE_LS) | (20<<BCM2835_SMI_RW_HOLD_LS) |
+             (1<<BCM2835_SMI_RW_PACE_LS);
+
+    paddr = bcm2835_smi + BCM2835_SMI_READ0;
+    bcm2835_peri_write (paddr, defConfig);
+    paddr = bcm2835_smi + BCM2835_SMI_WRITE0;
+    bcm2835_peri_write (paddr, defConfig);
+    paddr = bcm2835_smi + BCM2835_SMI_READ1;
+    bcm2835_peri_write (paddr, defConfig);
+    paddr = bcm2835_smi + BCM2835_SMI_WRITE1;
+    bcm2835_peri_write (paddr, defConfig);
+    paddr = bcm2835_smi + BCM2835_SMI_READ2;
+    bcm2835_peri_write (paddr, defConfig);
+    paddr = bcm2835_smi + BCM2835_SMI_WRITE2;
+    bcm2835_peri_write (paddr, defConfig);
+    paddr = bcm2835_smi + BCM2835_SMI_READ3;
+    bcm2835_peri_write (paddr, defConfig);
+    paddr = bcm2835_smi + BCM2835_SMI_WRITE3;
+    bcm2835_peri_write (paddr, defConfig);
+
+    return 1; // OK
+}  /* bcm2835_smi_begin */
+/* --------------------------------------------------- */
+
+void bcm2835_smi_end(void)
+{
+    /* Set all the SMI pins back to input */
+    bcm2835_gpio_fsel(2, BCM2835_GPIO_FSEL_INPT); /* SA3 */
+    bcm2835_gpio_fsel(3, BCM2835_GPIO_FSEL_INPT); /* SA2 */
+    bcm2835_gpio_fsel(4, BCM2835_GPIO_FSEL_INPT); /* SA1 */
+    bcm2835_gpio_fsel(5, BCM2835_GPIO_FSEL_INPT); /* SA0 */
+    bcm2835_gpio_fsel(6, BCM2835_GPIO_FSEL_INPT); /* SOE_N / SE */
+    bcm2835_gpio_fsel(7, BCM2835_GPIO_FSEL_INPT); /* SWE_N / SRW_N */
+    bcm2835_gpio_fsel(8, BCM2835_GPIO_FSEL_INPT); /* SD0 */
+    bcm2835_gpio_fsel(9, BCM2835_GPIO_FSEL_INPT); /* SD1 */
+    bcm2835_gpio_fsel(10, BCM2835_GPIO_FSEL_INPT); /* SD2 */
+    bcm2835_gpio_fsel(11, BCM2835_GPIO_FSEL_INPT); /* SD3 */
+    bcm2835_gpio_fsel(12, BCM2835_GPIO_FSEL_INPT); /* SD4 */
+    bcm2835_gpio_fsel(13, BCM2835_GPIO_FSEL_INPT); /* SD5 */
+    bcm2835_gpio_fsel(14, BCM2835_GPIO_FSEL_INPT); /* SD6 */
+    bcm2835_gpio_fsel(15, BCM2835_GPIO_FSEL_INPT); /* SD7 */
+}  /* bcm2835_smi_end */
+/* --------------------------------------------------- */
+
+void bcm2835_smi_set_timing (uint32_t smichannel, uint32_t readchannel,
+                             uint32_t setupcycles, uint32_t strobecycles,
+                             uint32_t holdcycles, uint32_t pacecycles)
+{
+    int RegOffset;
+    volatile uint32_t* psmitiming;
+    uint32_t RegValue;
+
+    if (readchannel!=0)
+    {
+        switch (smichannel)
+        {
+            case 0 : RegOffset = BCM2835_SMI_READ0; break;
+            case 1 : RegOffset = BCM2835_SMI_READ1; break;
+            case 2 : RegOffset = BCM2835_SMI_READ2; break;
+            case 3 : RegOffset = BCM2835_SMI_READ3; break;
+            default : return;
+        }
+    }
+    else
+    {
+        switch (smichannel)
+        {
+            case 0 : RegOffset = BCM2835_SMI_WRITE0; break;
+            case 1 : RegOffset = BCM2835_SMI_WRITE1; break;
+            case 2 : RegOffset = BCM2835_SMI_WRITE2; break;
+            case 3 : RegOffset = BCM2835_SMI_WRITE3; break;
+            default : return;
+        }
+    }
+
+    /* Get current timing configuration of the slot */
+    psmitiming = bcm2835_smi + RegOffset;
+    RegValue = bcm2835_peri_read (psmitiming);
+    /* Clear timing fields in register */
+    RegValue &= ~(BCM2835_SMI_RW_SETUP_MSK|BCM2835_SMI_RW_HOLD_MSK|BCM2835_SMI_RW_PACE_MSK|BCM2835_SMI_RW_STROBE_MSK);
+    /* Set timing values and write back to register */
+    RegValue |= (setupcycles << BCM2835_SMI_RW_SETUP_LS)  |
+                (strobecycles << BCM2835_SMI_RW_STROBE_LS) |
+                (holdcycles << BCM2835_SMI_RW_HOLD_LS)   |
+                (pacecycles << BCM2835_SMI_RW_PACE_LS);
+    bcm2835_peri_write (psmitiming, RegValue);
+}  /* bcm2835_set_smi_timing */
+/* --------------------------------------------------- */
+
+void bcm2835_smi_write(uint32_t smichannel, uint8_t data, uint32_t address)
+{
+    uint32_t status;
+    volatile uint32_t* psmics = bcm2835_smi + BCM2835_SMI_DIRCS;
+    volatile uint32_t* psmiaddr = bcm2835_smi + BCM2835_SMI_DIRADDR;
+    volatile uint32_t* psmidata = bcm2835_smi + BCM2835_SMI_DIRDATA;
+
+    /* Make sure we use a configuration that exists */
+    if (smichannel>3) return;
+
+    /* clear done bit if set */
+    if (bcm2835_peri_read(psmics) & BCM2835_SMI_DIRCS_DONE)
+    {
+        bcm2835_peri_write (psmics, BCM2835_SMI_DIRCS_DONE);
+    }
+
+    /* Start write transfer */
+    bcm2835_peri_write (psmiaddr, (smichannel<<BCM2835_SMI_DIRADRS_DEV_LS) | (address&BCM2835_SMI_DIRADRS_MSK));
+    bcm2835_peri_write (psmidata, data);
+    bcm2835_peri_write (psmics, BCM2835_SMI_DIRCS_WRITE|BCM2835_SMI_DIRCS_START|BCM2835_SMI_DIRCS_ENABLE);
+
+    /* Wait until write cycle is finished */
+    do {
+        status = bcm2835_peri_read(psmics);
+    } while ((status & BCM2835_SMI_DIRCS_DONE)==0);
+
+    /* clear done bit */
+    bcm2835_peri_write (psmics, BCM2835_SMI_DIRCS_DONE);
+}  /* bcm2835_smi_write */
+/* --------------------------------------------------- */
+
+uint32_t bcm2835_smi_read (uint32_t smichannel, uint32_t address)
+{
+    uint32_t status;
+    uint32_t data;
+    volatile uint32_t* psmics = bcm2835_smi + BCM2835_SMI_DIRCS;
+    volatile uint32_t* psmiaddr = bcm2835_smi + BCM2835_SMI_DIRADDR;
+    volatile uint32_t* psmidata = bcm2835_smi + BCM2835_SMI_DIRDATA;
+
+    /* Make sure we use a configuration that exists */
+    if (smichannel>3) return 0;
+
+    /* clear done bit if set */
+    if (bcm2835_peri_read(psmics) & BCM2835_SMI_DIRCS_DONE)
+    {
+        bcm2835_peri_write (psmics, BCM2835_SMI_DIRCS_DONE);
+    }
+
+    /* Start read transfer */
+    bcm2835_peri_write (psmiaddr, (smichannel<<BCM2835_SMI_DIRADRS_DEV_LS) | (address&BCM2835_SMI_DIRADRS_MSK));
+    bcm2835_peri_write (psmics, BCM2835_SMI_DIRCS_START|BCM2835_SMI_DIRCS_ENABLE);
+
+    /* Wait until read cycle is finished */
+    do {
+        status = bcm2835_peri_read(psmics);
+    } while ((status & BCM2835_SMI_DIRCS_DONE)==0);
+
+    /* Read data */
+    data = bcm2835_peri_read (psmidata);
+
+    /* clear done bit */
+    bcm2835_peri_write (psmics, BCM2835_SMI_DIRCS_DONE);
+
+    return data;
+}  /* bcm2835_smi_read */
+/* --------------------------------------------------- */
+
 /* Read the System Timer Counter (64-bits) */
 uint64_t bcm2835_st_read(void)
 {
@@ -1737,6 +2025,9 @@ int bcm2835_init(void)
 	bcm2835_st   = bcm2835_peripherals + BCM2835_ST_BASE/4;
 	bcm2835_aux  = bcm2835_peripherals + BCM2835_AUX_BASE/4;
 	bcm2835_spi1 = bcm2835_peripherals + BCM2835_SPI1_BASE/4;
+        /* BEB */
+	bcm2835_smi  = bcm2835_peripherals + BCM2835_SMI_BASE/4;
+
 
 	return 1; /* Success */
     }
@@ -1800,17 +2091,20 @@ int bcm2835_init(void)
      * the fact that we can only access GPIO
      * else try for the /dev/mem interface and get access to everything
      */
-    memfd = -1;
     ok = 0;
-    if (geteuid() == 0)
+    if (   geteuid() == 0
+#ifdef BCM2835_HAVE_LIBCAP
+	|| bcm2835_has_capability(CAP_SYS_RAWIO)
+#endif
+	)
     {
       /* Open the master /dev/mem device */
       if ((memfd = open("/dev/mem", O_RDWR | O_SYNC) ) < 0) 
-	{
+      {
 	  fprintf(stderr, "bcm2835_init: Unable to open /dev/mem: %s\n",
 		  strerror(errno)) ;
 	  goto exit;
-	}
+      }
       
       /* Base of the peripherals block is mapped to VM */
       bcm2835_peripherals = mapmem("gpio", bcm2835_peripherals_size, memfd, bcm2835_peripherals_base);
@@ -1830,26 +2124,29 @@ int bcm2835_init(void)
       bcm2835_st   = bcm2835_peripherals + BCM2835_ST_BASE/4;
       bcm2835_aux  = bcm2835_peripherals + BCM2835_AUX_BASE/4;
       bcm2835_spi1 = bcm2835_peripherals + BCM2835_SPI1_BASE/4;
+      /* BEB */
+      bcm2835_smi  = bcm2835_peripherals + BCM2835_SMI_BASE/4;
+
 
       ok = 1;
     }
     else
     {
-      /* Not root, try /dev/gpiomem */
-      /* Open the master /dev/mem device */
-      if ((memfd = open("/dev/gpiomem", O_RDWR | O_SYNC) ) < 0) 
+	/* Not root, try /dev/gpiomem */
+	/* Open the master /dev/mem device */
+	if ((memfd = open("/dev/gpiomem", O_RDWR | O_SYNC) ) < 0) 
 	{
-	  fprintf(stderr, "bcm2835_init: Unable to open /dev/gpiomem: %s\n",
-		  strerror(errno)) ;
-	  goto exit;
+	    fprintf(stderr, "bcm2835_init: Unable to open /dev/gpiomem: %s\n",
+		    strerror(errno)) ;
+	    goto exit;
 	}
-      
-      /* Base of the peripherals block is mapped to VM */
-      bcm2835_peripherals_base = 0;
-      bcm2835_peripherals = mapmem("gpio", bcm2835_peripherals_size, memfd, bcm2835_peripherals_base);
-      if (bcm2835_peripherals == MAP_FAILED) goto exit;
-      bcm2835_gpio = bcm2835_peripherals;
-      ok = 1;
+	
+	/* Base of the peripherals block is mapped to VM */
+	bcm2835_peripherals_base = 0;
+	bcm2835_peripherals = mapmem("gpio", bcm2835_peripherals_size, memfd, bcm2835_peripherals_base);
+	if (bcm2835_peripherals == MAP_FAILED) goto exit;
+	bcm2835_gpio = bcm2835_peripherals;
+	ok = 1;
     }
 
 exit:
@@ -1879,6 +2176,9 @@ int bcm2835_close(void)
     bcm2835_st   = MAP_FAILED;
     bcm2835_aux  = MAP_FAILED;
     bcm2835_spi1 = MAP_FAILED;
+    /* BEB */
+    bcm2835_smi = MAP_FAILED;
+
     return 1; /* Success */
 }    
 

src/bcm2835.h

@@ -18,15 +18,16 @@
   and for accessing the system timers.
   Pin event detection is supported by polling (interrupts are not supported).
 
-  Works on all versions upt to and including RPI 4. 
+  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/bcm2835-1.62.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.
@@ -54,6 +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
@@ -72,6 +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
@@ -184,6 +218,15 @@
   - 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,
@@ -301,21 +344,25 @@
   
   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 https://www.gnu.org/licenses/gpl-2.0.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
 
@@ -551,7 +598,54 @@
   \version 1.62 2020-01-12
   Fixed a problem that could cause compile failures with size_t and off_t
 
-  \author  Mike McCauley (mikem@airspayce.com) DO NOT CONTACT THE AUTHOR DIRECTLY: USE THE LISTS
+  \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
 */
 
 
@@ -561,11 +655,21 @@
 
 #include <stdint.h>
 
-#define BCM2835_VERSION 10062 /* Version 1.62 */
+/* 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
@@ -635,6 +739,10 @@
 /*! Base Address of the BSC1 registers */
 #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
@@ -697,6 +805,11 @@ extern volatile uint32_t *bcm2835_aux;
 */
 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()
@@ -710,9 +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_AUX  = 9,  /*!< Base of the AUX registers. */
-	BCM2835_REGBASE_SPI1 = 10  /*!< Base of the SPI1 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 */
@@ -965,8 +1081,8 @@ typedef enum
 #define BCM2835_AUX_SPI_CNTL1_MSBF_IN	0x00000002  /*!< */
 #define BCM2835_AUX_SPI_CNTL1_KEEP_IN	0x00000001  /*!< */
 
-#define BCM2835_AUX_SPI_STAT_TX_LVL	0xFF000000  /*!< */
-#define BCM2835_AUX_SPI_STAT_RX_LVL	0x00FF0000  /*!< */
+#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  /*!< */
@@ -1083,7 +1199,7 @@ typedef enum
    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 */
@@ -1115,6 +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.
@@ -1136,9 +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
@@ -1721,14 +1900,14 @@ extern "C" {
     extern void bcm2835_spi_write(uint16_t data);
 
     /*! Start AUX SPI operations.
-      Forces RPi AUX SPI pins P1-36 (MOSI), P1-38 (MISO), P1-40 (CLK) and P1-36 (CE2)
+      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 P1-36 (MOSI), P1-38 (MISO), P1-40 (CLK) and P1-36 (CE2)
+       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);
@@ -1745,10 +1924,10 @@ extern "C" {
      */
     extern uint16_t bcm2835_aux_spi_CalcClockDivider(uint32_t speed_hz);
 
-    /*! Transfers half-word to and from the AUX SPI slave.
+    /*! 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 8 bit byte simultaneously read from  MISO
+      \return The 16 bit byte simultaneously read from  MISO
       \sa bcm2835_spi_transfern()
     */
     extern void bcm2835_aux_spi_write(uint16_t data);
@@ -1764,7 +1943,7 @@ extern "C" {
       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 int eh buffer, and the number of bytes to send/received
+      \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);
@@ -1779,6 +1958,15 @@ extern "C" {
     */
     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
@@ -1868,6 +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.
       @{
@@ -1969,3 +2217,7 @@ Broadcom bcm2835. Contributed by Shahrooz Shahparnia.
   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.
+*/

test-driver

@@ -3,7 +3,7 @@
 
 scriptversion=2018-03-07.03; # UTC
 
-# Copyright (C) 2011-2018 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
@@ -42,11 +42,13 @@ 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-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
 }
 
@@ -103,8 +105,11 @@ 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 $estatus -eq 99; then
@@ -126,7 +131,7 @@ esac
 # know whether the test passed or failed simply by looking at the '.log'
 # file, without the need of also peaking into the corresponding '.trs'
 # file (automake bug#11814).
-echo "$res $test_name (exit status: $estatus)" >>$log_file
+echo "$res $test_name (exit status: $estatus)" >>"$log_file"
 
 # Report outcome to console.
 echo "${col}${res}${std}: $test_name"