From 9a4ca8108b43da41016d6e6ec0bef528a80d94de Mon Sep 17 00:00:00 2001 From: Victor Chapaev Date: Fri, 30 Jun 2023 12:12:48 +0300 Subject: [PATCH] =?UTF-8?q?=D0=9F=D1=83=D0=B1=D0=BB=D0=B8=D0=BA=D0=B0?= =?UTF-8?q?=D1=86=D0=B8=D1=8F=20=D0=B2=D0=B5=D1=80=D1=81=D0=B8=D0=B8=201.1?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- COPYING | 873 +++++++++++++---------------------------- ChangeLog | 5 + Makefile.am | 4 + Makefile.in | 3 + README | 5 + configure | 52 +-- configure.in | 5 +- examples/blink/blink.c | 14 +- examples/event/event.c | 18 +- examples/input/input.c | 14 +- src/bcm2835.c | 120 +++--- src/bcm2835.h | 91 ++--- 12 files changed, 447 insertions(+), 757 deletions(-) diff --git a/COPYING b/COPYING index 94a9ed0..d159169 100644 --- a/COPYING +++ b/COPYING @@ -1,622 +1,281 @@ GNU GENERAL PUBLIC LICENSE - Version 3, 29 June 2007 + Version 2, June 1991 - Copyright (C) 2007 Free Software Foundation, Inc. + Copyright (C) 1989, 1991 Free Software Foundation, Inc., + 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. 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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. + 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. END OF TERMS AND CONDITIONS @@ -628,15 +287,15 @@ 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 -state the exclusion of warranty; and each file should have at least +convey the exclusion of warranty; and each file should have at least the "copyright" line and a pointer to where the full notice is found. Copyright (C) - 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 3 of the License, or + the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, @@ -644,31 +303,37 @@ 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, see . + 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. Also add information on how to contact you by electronic and paper mail. - If the program does terminal interaction, make it output a short -notice like this when it starts in an interactive mode: +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: - Copyright (C) - This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + Gnomovision version 69, Copyright (C) year name of author + Gnomovision 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, your program's commands -might be different; for a GUI interface, you would use an "about box". +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. - 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 -. +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: - 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 -. + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 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. diff --git a/ChangeLog b/ChangeLog index e69de29..f4aef97 100644 --- a/ChangeLog +++ b/ChangeLog @@ -0,0 +1,5 @@ +2012-06-25 + 1.1 Minor fixes in examples after feedback from panik. + +2012-06-24 + 1.0 Initial public release diff --git a/Makefile.am b/Makefile.am index 3c65e16..18b0cb2 100644 --- a/Makefile.am +++ b/Makefile.am @@ -5,3 +5,7 @@ EXTRA_DIST = examples/blink/blink.c \ examples/input/input.c \ examples/event/event.c +upload: + rsync -avz @PACKAGE_TARNAME@-@VERSION@.tar.gz doc/html/ server2:/var/www/html/mikem/@PACKAGE_NAME@ + + diff --git a/Makefile.in b/Makefile.in index b833a65..695b339 100644 --- a/Makefile.in +++ b/Makefile.in @@ -676,6 +676,9 @@ uninstall-am: pdf-am ps ps-am tags tags-recursive uninstall uninstall-am +upload: + rsync -avz @PACKAGE_TARNAME@-@VERSION@.tar.gz doc/html/ server2:/var/www/html/mikem/@PACKAGE_NAME@ + # Tell versions [3.59,3.63) of GNU make to not export all variables. # Otherwise a system limit (for SysV at least) may be exceeded. .NOEXPORT: diff --git a/README b/README index e69de29..85af824 100644 --- a/README +++ b/README @@ -0,0 +1,5 @@ +This is a C library for Raspberry Pi (RPi). It provides access to +GPIO and other IO functions on the Broadcom BCM 2835 chip. +allowing access to the +26 pin ISE plug on the RPi board so you can control and interface with various +external devices. diff --git a/configure b/configure index e1b90ec..4bc4a10 100755 --- a/configure +++ b/configure @@ -1,6 +1,8 @@ #! /bin/sh # Guess values for system-dependent variables and create Makefiles. -# Generated by GNU Autoconf 2.68. +# Generated by GNU Autoconf 2.68 for bcm2835 1.1. +# +# Report bugs to . # # # Copyright (C) 1992, 1993, 1994, 1995, 1996, 1998, 1999, 2000, 2001, @@ -235,10 +237,11 @@ fi $as_echo "$0: In particular, zsh $ZSH_VERSION has bugs and should" $as_echo "$0: be upgraded to zsh 4.3.4 or later." else - $as_echo "$0: Please tell bug-autoconf@gnu.org about your system, -$0: including any error possibly output before this -$0: message. Then install a modern shell, or manually run -$0: the script under such a shell if you do have one." + $as_echo "$0: Please tell bug-autoconf@gnu.org and mikem@open.com.au +$0: about your system, including any error possibly output +$0: before this message. Then install a modern shell, or +$0: manually run the script under such a shell if you do +$0: have one." fi exit 1 fi @@ -554,12 +557,12 @@ MFLAGS= MAKEFLAGS= # Identity of this package. -PACKAGE_NAME= -PACKAGE_TARNAME= -PACKAGE_VERSION= -PACKAGE_STRING= -PACKAGE_BUGREPORT= -PACKAGE_URL= +PACKAGE_NAME='bcm2835' +PACKAGE_TARNAME='bcm2835' +PACKAGE_VERSION='1.1' +PACKAGE_STRING='bcm2835 1.1' +PACKAGE_BUGREPORT='mikem@open.com.au' +PACKAGE_URL='' ac_subst_vars='am__EXEEXT_FALSE am__EXEEXT_TRUE @@ -699,7 +702,7 @@ sharedstatedir='${prefix}/com' localstatedir='${prefix}/var' includedir='${prefix}/include' oldincludedir='/usr/include' -docdir='${datarootdir}/doc/${PACKAGE}' +docdir='${datarootdir}/doc/${PACKAGE_TARNAME}' infodir='${datarootdir}/info' htmldir='${docdir}' dvidir='${docdir}' @@ -1201,7 +1204,7 @@ if test "$ac_init_help" = "long"; then # Omit some internal or obsolete options to make the list less imposing. # This message is too long to be a string in the A/UX 3.1 sh. cat <<_ACEOF -\`configure' configures this package to adapt to many kinds of systems. +\`configure' configures bcm2835 1.1 to adapt to many kinds of systems. Usage: $0 [OPTION]... [VAR=VALUE]... @@ -1249,7 +1252,7 @@ Fine tuning of the installation directories: --infodir=DIR info documentation [DATAROOTDIR/info] --localedir=DIR locale-dependent data [DATAROOTDIR/locale] --mandir=DIR man documentation [DATAROOTDIR/man] - --docdir=DIR documentation root [DATAROOTDIR/doc/PACKAGE] + --docdir=DIR documentation root [DATAROOTDIR/doc/bcm2835] --htmldir=DIR html documentation [DOCDIR] --dvidir=DIR dvi documentation [DOCDIR] --pdfdir=DIR pdf documentation [DOCDIR] @@ -1266,7 +1269,9 @@ _ACEOF fi if test -n "$ac_init_help"; then - + case $ac_init_help in + short | recursive ) echo "Configuration of bcm2835 1.1:";; + esac cat <<\_ACEOF Optional Features: @@ -1288,7 +1293,7 @@ Some influential environment variables: Use these variables to override the choices made by `configure' or to help it to find libraries and programs with nonstandard names/locations. -Report bugs to the package provider. +Report bugs to . _ACEOF ac_status=$? fi @@ -1351,7 +1356,7 @@ fi test -n "$ac_init_help" && exit $ac_status if $ac_init_version; then cat <<\_ACEOF -configure +bcm2835 configure 1.1 generated by GNU Autoconf 2.68 Copyright (C) 2010 Free Software Foundation, Inc. @@ -1406,7 +1411,7 @@ cat >config.log <<_ACEOF This file contains any messages produced by compilers while running configure, to aid debugging if configure makes a mistake. -It was created by $as_me, which was +It was created by bcm2835 $as_me 1.1, which was generated by GNU Autoconf 2.68. Invocation command line was $ $0 $@ @@ -1754,6 +1759,7 @@ ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $ ac_compiler_gnu=$ac_cv_c_compiler_gnu + ac_config_headers="$ac_config_headers config.h" am__api_version='1.11' @@ -2222,8 +2228,8 @@ fi # Define the identity of the package. - PACKAGE=bcm2835 - VERSION=1.0 + PACKAGE='bcm2835' + VERSION='1.1' cat >>confdefs.h <<_ACEOF @@ -3934,7 +3940,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1 # report actual input values of CONFIG_FILES etc. instead of their # values after options handling. ac_log=" -This file was extended by $as_me, which was +This file was extended by bcm2835 $as_me 1.1, which was generated by GNU Autoconf 2.68. Invocation command line was CONFIG_FILES = $CONFIG_FILES @@ -3994,13 +4000,13 @@ $config_headers Configuration commands: $config_commands -Report bugs to the package provider." +Report bugs to ." _ACEOF cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`" ac_cs_version="\\ -config.status +bcm2835 config.status 1.1 configured by $0, generated by GNU Autoconf 2.68, with options \\"\$ac_cs_config\\" diff --git a/configure.in b/configure.in index 32de25e..f6ad458 100644 --- a/configure.in +++ b/configure.in @@ -7,9 +7,10 @@ dnl $Id: configure.in,v 1.12 2009/08/12 09:43:22 mikem Exp mikem $ dnl (C) 2012 Mike McCauley (mikem@open.com.au) dnl - Initial packaging -AC_INIT +AC_INIT([bcm2835], [1.1], [mikem@open.com.au]) + AM_CONFIG_HEADER(config.h) -AM_INIT_AUTOMAKE(bcm2835, 1.0) +AM_INIT_AUTOMAKE() AC_CHECK_PROGS([DOXYGEN], [doxygen]) if test -z "$DOXYGEN"; diff --git a/examples/blink/blink.c b/examples/blink/blink.c index 2b705f3..8281a2a 100644 --- a/examples/blink/blink.c +++ b/examples/blink/blink.c @@ -5,12 +5,12 @@ // // After installing bcm2835, you can build this // with something like: -// gcc -l bcm2835 -o blink blink.c -// ./blink +// gcc -o blink blink.c -l bcm2835 +// sudo ./blink // // Or you can test it before installing with: // gcc -o blink -I ../../src ../../src/bcm2835.c blink.c -// ./blink +// sudo ./blink // // Author: Mike McCauley (mikem@open.com.au) // Copyright (C) 2011 Mike McCauley @@ -25,25 +25,25 @@ int main(int argc, char **argv) { // If you call this, it will not actually access the GPIO // Use for testing -// bcm2845_set_debug(1); +// bcm2835_set_debug(1); if (!bcm2835_init()) return 1; // Set the pin to be an output - bcm2845_gpio_fsel(PIN, BCM2835_GPIO_FSEL_OUTP); + bcm2835_gpio_fsel(PIN, BCM2835_GPIO_FSEL_OUTP); // Blink while (1) { // Turn it on - bcm2845_gpio_write(PIN, HIGH); + bcm2835_gpio_write(PIN, HIGH); // wait a bit delay(500); // turn it off - bcm2845_gpio_write(PIN, LOW); + bcm2835_gpio_write(PIN, LOW); // wait a bit delay(500); diff --git a/examples/event/event.c b/examples/event/event.c index 84b62eb..69a3cd4 100644 --- a/examples/event/event.c +++ b/examples/event/event.c @@ -5,12 +5,12 @@ // // After installing bcm2835, you can build this // with something like: -// gcc -l bcm2835 -o event event.c -// ./event +// gcc -o event event.c -l bcm2835 +// sudo ./event // // Or you can test it before installing with: // gcc -o event -I ../../src ../../src/bcm2835.c event.c -// ./event +// sudo ./event // // Author: Mike McCauley (mikem@open.com.au) // Copyright (C) 2011 Mike McCauley @@ -26,25 +26,25 @@ int main(int argc, char **argv) { // If you call this, it will not actually access the GPIO // Use for testing - bcm2845_set_debug(1); +// bcm2835_set_debug(1); if (!bcm2835_init()) return 1; // Set RPI pin P1-15 to be an input - bcm2845_gpio_fsel(PIN, BCM2835_GPIO_FSEL_INPT); + bcm2835_gpio_fsel(PIN, BCM2835_GPIO_FSEL_INPT); // with a pullup - bcm2845_gpio_set_pud(PIN, BCM2835_GPIO_PUD_UP); + bcm2835_gpio_set_pud(PIN, BCM2835_GPIO_PUD_UP); // And a low detect enable - bcm2845_gpio_len(RPI_GPIO_PIN_15); + bcm2835_gpio_len(PIN); // Blink while (1) { - if (bcm2845_gpio_eds(PIN)) + if (bcm2835_gpio_eds(PIN)) { // Now clear the eds flag by setting it to 1 - bcm2845_gpio_set_eds(PIN); + bcm2835_gpio_set_eds(PIN); printf("low event detect for pin 15\n"); } diff --git a/examples/input/input.c b/examples/input/input.c index fe96a58..6f9646e 100644 --- a/examples/input/input.c +++ b/examples/input/input.c @@ -5,12 +5,12 @@ // // After installing bcm2835, you can build this // with something like: -// gcc -l bcm2835 -o input input.c -// ./input +// gcc -o input input.c -l bcm2835 +// sudo ./input // // Or you can test it before installing with: // gcc -o input -I ../../src ../../src/bcm2835.c input.c -// ./input +// sudo ./input // // Author: Mike McCauley (mikem@open.com.au) // Copyright (C) 2011 Mike McCauley @@ -26,21 +26,21 @@ int main(int argc, char **argv) { // If you call this, it will not actually access the GPIO // Use for testing - bcm2845_set_debug(1); +// bcm2835_set_debug(1); if (!bcm2835_init()) return 1; // Set RPI pin P1-15 to be an input - bcm2845_gpio_fsel(PIN, BCM2835_GPIO_FSEL_INPT); + bcm2835_gpio_fsel(PIN, BCM2835_GPIO_FSEL_INPT); // with a pullup - bcm2845_gpio_set_pud(PIN, BCM2835_GPIO_PUD_UP); + bcm2835_gpio_set_pud(PIN, BCM2835_GPIO_PUD_UP); // Blink while (1) { // Read some data - uint8_t value = bcm2845_gpio_lev(PIN); + uint8_t value = bcm2835_gpio_lev(PIN); printf("read from pin 15: %d\n", value); // wait a bit diff --git a/src/bcm2835.c b/src/bcm2835.c index 05e2b43..c1111b7 100644 --- a/src/bcm2835.c +++ b/src/bcm2835.c @@ -35,17 +35,17 @@ static uint8_t debug = 0; // Low level register access functions // -void bcm2845_set_debug(uint8_t d) +void bcm2835_set_debug(uint8_t d) { debug = d; } // safe read from peripheral -uint32_t bcm2845_peri_read(volatile uint32_t* paddr) +uint32_t bcm2835_peri_read(volatile uint32_t* paddr) { if (debug) { - printf("bcm2845_peri_read paddr %08X\n", paddr); + printf("bcm2835_peri_read paddr %08X\n", paddr); return 0; } else @@ -57,11 +57,11 @@ uint32_t bcm2845_peri_read(volatile uint32_t* paddr) } // safe write to peripheral -void bcm2845_peri_write(volatile uint32_t* paddr, uint32_t value) +void bcm2835_peri_write(volatile uint32_t* paddr, uint32_t value) { if (debug) { - printf("bcm2845_peri_write paddr %08X, value %08X\n", paddr, value); + printf("bcm2835_peri_write paddr %08X, value %08X\n", paddr, value); } else { @@ -71,11 +71,11 @@ void bcm2845_peri_write(volatile uint32_t* paddr, uint32_t value) } // Set only the bits covered by the mask -void bcm2845_peri_set_bits(volatile uint32_t* paddr, uint32_t value, uint32_t mask) +void bcm2835_peri_set_bits(volatile uint32_t* paddr, uint32_t value, uint32_t mask) { - uint32_t v = bcm2845_peri_read(paddr); + uint32_t v = bcm2835_peri_read(paddr); v = (v & ~mask) | (value & mask); - bcm2845_peri_write(paddr, v); + bcm2835_peri_write(paddr, v); } // @@ -83,7 +83,7 @@ void bcm2845_peri_set_bits(volatile uint32_t* paddr, uint32_t value, uint32_t ma // // Function select -// pin is a BCM2845 GPIO pin number NOT RPi pin number +// pin is a BCM2835 GPIO pin number NOT RPi pin number // There are 6 control registers, each control the functions of a block // of 10 pins. // Each control register has 10 sets of 3 bits per GPIO pin: @@ -99,138 +99,138 @@ void bcm2845_peri_set_bits(volatile uint32_t* paddr, uint32_t value, uint32_t ma // // So the 3 bits for port X are: // X / 10 + ((X % 10) * 3) -void bcm2845_gpio_fsel(uint8_t pin, uint8_t mode) +void bcm2835_gpio_fsel(uint8_t pin, uint8_t mode) { // Function selects are 10 pins per 32 bit word, 3 bits per pin volatile uint32_t* paddr = gpio + BCM2835_GPFSEL0/4 + (pin/10); uint8_t shift = (pin % 10) * 3; uint32_t mask = BCM2835_GPIO_FSEL_MASK << shift; uint32_t value = mode << shift; - bcm2845_peri_set_bits(paddr, value, mask); + bcm2835_peri_set_bits(paddr, value, mask); } // Set putput pin -void bcm2845_gpio_set(uint8_t pin) +void bcm2835_gpio_set(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPSET0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, 1 << shift); + bcm2835_peri_write(paddr, 1 << shift); } // Clear output pin -void bcm2845_gpio_clr(uint8_t pin) +void bcm2835_gpio_clr(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPCLR0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, 1 << shift); + bcm2835_peri_write(paddr, 1 << shift); } // Read input pin -uint8_t bcm2845_gpio_lev(uint8_t pin) +uint8_t bcm2835_gpio_lev(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPLEV0/4 + pin/32; uint8_t shift = pin % 32; - uint32_t value = bcm2845_peri_read(paddr); + uint32_t value = bcm2835_peri_read(paddr); return (value & (1 << shift)) ? HIGH : LOW; } // See if an event detection bit is set // Sigh cant support interrupts yet -uint8_t bcm2845_gpio_eds(uint8_t pin) +uint8_t bcm2835_gpio_eds(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPEDS0/4 + pin/32; uint8_t shift = pin % 32; - uint32_t value = bcm2845_peri_read(paddr); + uint32_t value = bcm2835_peri_read(paddr); return (value & (1 << shift)) ? HIGH : LOW; } // Write a 1 to clear the bit in EDS -void bcm2845_gpio_set_eds(uint8_t pin) +void bcm2835_gpio_set_eds(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPEDS0/4 + pin/32; uint8_t shift = pin % 32; uint32_t value = 1 << shift; - bcm2845_peri_write(paddr, value); + bcm2835_peri_write(paddr, value); } // Rising edge detect enable -void bcm2845_gpio_ren(uint8_t pin) +void bcm2835_gpio_ren(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPREN0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, 1 << shift); + bcm2835_peri_write(paddr, 1 << shift); } // Falling edge detect enable -void bcm2845_gpio_fen(uint8_t pin) +void bcm2835_gpio_fen(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPFEN0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, 1 << shift); + bcm2835_peri_write(paddr, 1 << shift); } // High detect enable -void bcm2845_gpio_hen(uint8_t pin) +void bcm2835_gpio_hen(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPHEN0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, 1 << shift); + bcm2835_peri_write(paddr, 1 << shift); } // Low detect enable -void bcm2845_gpio_len(uint8_t pin) +void bcm2835_gpio_len(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPLEN0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, 1 << shift); + bcm2835_peri_write(paddr, 1 << shift); } // Async rising edge detect enable -void bcm2845_gpio_aren(uint8_t pin) +void bcm2835_gpio_aren(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPAREN0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, 1 << shift); + bcm2835_peri_write(paddr, 1 << shift); } // Async falling edge detect enable -void bcm2845_gpio_afen(uint8_t pin) +void bcm2835_gpio_afen(uint8_t pin) { volatile uint32_t* paddr = gpio + BCM2835_GPAFEN0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, 1 << shift); + bcm2835_peri_write(paddr, 1 << shift); } // Set pullup/down -void bcm2845_gpio_pud(uint8_t pud) +void bcm2835_gpio_pud(uint8_t pud) { volatile uint32_t* paddr = gpio + BCM2835_GPPUD/4; - bcm2845_peri_write(paddr, pud); + bcm2835_peri_write(paddr, pud); } // Pullup/down clock // Clocks the value of pud into the GPIO pin -void bcm2845_gpio_pudclk(uint8_t pin, uint8_t on) +void bcm2835_gpio_pudclk(uint8_t pin, uint8_t on) { volatile uint32_t* paddr = gpio + BCM2835_GPPUDCLK0/4 + pin/32; uint8_t shift = pin % 32; - bcm2845_peri_write(paddr, (on ? 1 : 0) << shift); + bcm2835_peri_write(paddr, (on ? 1 : 0) << shift); } // Read GPIO pad behaviour for groups of GPIOs -uint32_t bcm2845_gpio_pad(uint8_t group) +uint32_t bcm2835_gpio_pad(uint8_t group) { volatile uint32_t* paddr = pads + BCM2835_PADS_GPIO_0_27/4 + group*2; - return bcm2845_peri_read(paddr); + return bcm2835_peri_read(paddr); } // Set GPIO pad behaviour for groups of GPIOs // powerup value for al pads is // BCM2835_PAD_SLEW_RATE_UNLIMITED | BCM2835_PAD_HYSTERESIS_ENABLED | BCM2835_PAD_DRIVE_8mA -void bcm2845_gpio_set_pad(uint8_t group, uint32_t control) +void bcm2835_gpio_set_pad(uint8_t group, uint32_t control) { volatile uint32_t* paddr = pads + BCM2835_PADS_GPIO_0_27/4 + group*2; - bcm2845_peri_write(paddr, control); + bcm2835_peri_write(paddr, control); } // Some convenient arduino like functions @@ -259,12 +259,12 @@ void delayMicroseconds (unsigned int micros) // // Set the state of an output -void bcm2845_gpio_write(uint8_t pin, uint8_t on) +void bcm2835_gpio_write(uint8_t pin, uint8_t on) { if (on) - bcm2845_gpio_set(pin); + bcm2835_gpio_set(pin); else - bcm2845_gpio_clr(pin); + bcm2835_gpio_clr(pin); } // Set the pullup/down resistor for a pin @@ -284,14 +284,14 @@ void bcm2845_gpio_write(uint8_t pin, uint8_t on) // 6. Write to GPPUDCLK0/1 to remove the clock // // RPi has P1-03 and P1-05 with 1k8 pullup resistor -void bcm2845_gpio_set_pud(uint8_t pin, uint8_t pud) +void bcm2835_gpio_set_pud(uint8_t pin, uint8_t pud) { - bcm2845_gpio_pud(pud); + bcm2835_gpio_pud(pud); delayMicroseconds(10); - bcm2845_gpio_pudclk(pin, 1); + bcm2835_gpio_pudclk(pin, 1); delayMicroseconds(10); - bcm2845_gpio_pud(BCM2835_GPIO_PUD_OFF); - bcm2845_gpio_pudclk(pin, 0); + bcm2835_gpio_pud(BCM2835_GPIO_PUD_OFF); + bcm2835_gpio_pudclk(pin, 0); } // Initialise this library @@ -400,35 +400,35 @@ int bcm2835_init() int main(int argc, char **argv) { // Be non-destructive - bcm2845_set_debug(1); + bcm2835_set_debug(1); if (!bcm2835_init()) return 1; // Configure some GPIO pins fo some testing // Set RPI pin P1-11 to be an output - bcm2845_gpio_fsel(RPI_GPIO_P1_11, BCM2835_GPIO_FSEL_OUTP); + bcm2835_gpio_fsel(RPI_GPIO_P1_11, BCM2835_GPIO_FSEL_OUTP); // Set RPI pin P1-15 to be an input - bcm2845_gpio_fsel(RPI_GPIO_P1_15, BCM2835_GPIO_FSEL_INPT); + bcm2835_gpio_fsel(RPI_GPIO_P1_15, BCM2835_GPIO_FSEL_INPT); // with a pullup - bcm2845_gpio_set_pud(RPI_GPIO_P1_15, BCM2835_GPIO_PUD_UP); + bcm2835_gpio_set_pud(RPI_GPIO_P1_15, BCM2835_GPIO_PUD_UP); // And a low detect enable - bcm2845_gpio_len(RPI_GPIO_P1_15); + bcm2835_gpio_len(RPI_GPIO_P1_15); // and input hysteresis disabled on GPIOs 0 to 27 - bcm2845_gpio_set_pad(BCM2835_PAD_GROUP_GPIO_0_27, BCM2835_PAD_SLEW_RATE_UNLIMITED|BCM2835_PAD_DRIVE_8mA); + bcm2835_gpio_set_pad(BCM2835_PAD_GROUP_GPIO_0_27, BCM2835_PAD_SLEW_RATE_UNLIMITED|BCM2835_PAD_DRIVE_8mA); #if 1 // Blink while (1) { // Turn it on - bcm2845_gpio_write(RPI_GPIO_P1_11, HIGH); + bcm2835_gpio_write(RPI_GPIO_P1_11, HIGH); // wait a bit delay(500); // turn it off - bcm2845_gpio_write(RPI_GPIO_P1_11, LOW); + bcm2835_gpio_write(RPI_GPIO_P1_11, LOW); // wait a bit delay(500); @@ -440,7 +440,7 @@ int main(int argc, char **argv) while (1) { // Read some data - uint8_t value = bcm2845_gpio_lev(RPI_GPIO_P1_15); + uint8_t value = bcm2835_gpio_lev(RPI_GPIO_P1_15); printf("read from pin 15: %d\n", value); // wait a bit @@ -453,10 +453,10 @@ int main(int argc, char **argv) // eds will be set whenever pin 15 goes low while (1) { - if (bcm2845_gpio_eds(RPI_GPIO_P1_15)) + if (bcm2835_gpio_eds(RPI_GPIO_P1_15)) { // Now clear the eds flag by setting it to 1 - bcm2845_gpio_set_eds(RPI_GPIO_P1_15); + bcm2835_gpio_set_eds(RPI_GPIO_P1_15); printf("low event detect for pin 15\n"); } diff --git a/src/bcm2835.h b/src/bcm2835.h index 0c7b2fa..ce0a40f 100644 --- a/src/bcm2835.h +++ b/src/bcm2835.h @@ -11,9 +11,9 @@ /// \mainpage C library for Broadcom BCM 2835 as used in Raspberry Pi /// /// This is a C library for Raspberry Pi (RPi). It provides access to -/// GPIO and other IO functions on the Broadcom BCM 2835 chip. -/// allowing access to the -/// 26 pin ISE plug on the RPi board so you can control and interface with various external devices. +/// GPIO and other IO functions on the Broadcom BCM 2835 chip, +/// allowing access to the GPIO pins on the +/// 26 pin IDE plug on the RPi board so you can control and interface with various external devices. /// /// It provides functions for reading digital inputs and setting digital outputs. /// Pin event detection is supported by polling (interrupts not supported). @@ -22,6 +22,13 @@ /// any Linux-based distro (but clearly is no use except on Raspberry Pi or another board with /// BCM 2835). /// +/// The latest version of this documentation can be downloaded from +/// http://www.open.com.au/mikem/bcm2835 +/// +/// The version of the package that this documentation refers to can be downloaded +/// from http://www.open.com.au/mikem/bcm2835/bcm2835-1.1.tar.gz +/// You can find the latest version at http://www.open.com.au/mikem/bcm2835 +/// /// Several example programs are provided. /// /// Based on data in http://elinux.org/RPi_Low-level_peripherals and @@ -71,14 +78,8 @@ /// the right to share who uses it. If you wish to use this software under Open /// Source Licensing, you must contribute all your source code to the open source /// community in accordance with the GPL Version 2 when your application is -/// distributed. See http://www.gnu.org/copyleft/gpl.html +/// distributed. See http://www.gnu.org/copyleft/gpl.html and COPYING /// -/// \par Commercial Licensing -/// -/// This is the appropriate option if you are creating proprietary applications -/// and you are not prepared to distribute and share the source code of your -/// application. Contact info@open.com.au for details. -/// /// \par Revision History /// /// \version 1.0 Initial release @@ -272,7 +273,7 @@ extern "C" { /// Initialise the library by opening /dev/mem and getting pointers to the /// internal memory for BCM 2835 device registers. You must call this (successfully) /// before calling any other - /// functions in this library (except bcm2845_set_debug). + /// functions in this library (except bcm2835_set_debug). /// If bcm2835_init() fails by returning 0, /// calling any other function may result in crashes or other failures. /// Prints messages to stderr in case of errors. @@ -285,7 +286,7 @@ extern "C" { /// A value of 0, the default, causes nomal operation. /// Call this before calling bcm2835_init(); /// \param[in] debug The new debug level. 1 means debug - extern void bcm2845_set_debug(uint8_t debug); + extern void bcm2835_set_debug(uint8_t debug); /// @} // end of init @@ -298,7 +299,7 @@ extern "C" { /// \param[in] paddr Physical address to read from. See BCM2835_GPIO_BASE etc. /// \return the value read from the 32 bit register /// \sa Physical Addresses - extern uint32_t bcm2845_peri_read(volatile uint32_t* paddr); + extern uint32_t bcm2835_peri_read(volatile uint32_t* paddr); /// Writes 32 bit value from a peripheral address @@ -307,7 +308,7 @@ extern "C" { /// \param[in] paddr Physical address to read from. See BCM2835_GPIO_BASE etc. /// \param[in] value The 32 bit value to write /// \sa Physical Addresses - extern void bcm2845_peri_write(volatile uint32_t* paddr, uint32_t value); + extern void bcm2835_peri_write(volatile uint32_t* paddr, uint32_t value); /// Alters a number of bits in a 32 peripheral regsiter. /// It reads the current valu and then alters the bits deines as 1 in mask, @@ -320,7 +321,7 @@ extern "C" { /// \param[in] value The 32 bit value to write, masked in by mask. /// \param[in] mask Bitmask that defines the bits that will be altered in the register. /// \sa Physical Addresses - extern void bcm2845_peri_set_bits(volatile uint32_t* paddr, uint32_t value, uint32_t mask); + extern void bcm2835_peri_set_bits(volatile uint32_t* paddr, uint32_t value, uint32_t mask); /// @} // end of lowlevel /// \defgroup gpio GPIO register access @@ -330,41 +331,41 @@ extern "C" { /// the pin as Input, Output or one of the 6 alternate functions. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from RPiGPIOPin. /// \param[in] mode Mode to set the pin to, one of BCM2835_GPIO_FSEL_* from \ref bcm2835FunctionSelect - extern void bcm2845_gpio_fsel(uint8_t pin, uint8_t mode); + extern void bcm2835_gpio_fsel(uint8_t pin, uint8_t mode); /// Sets the specified pin output to /// HIGH. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - /// \sa bcm2845_gpio_write() - extern void bcm2845_gpio_set(uint8_t pin); + /// \sa bcm2835_gpio_write() + extern void bcm2835_gpio_set(uint8_t pin); /// Sets the specified pin output to /// LOW. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - /// \sa bcm2845_gpio_write() - extern void bcm2845_gpio_clr(uint8_t pin); + /// \sa bcm2835_gpio_write() + extern void bcm2835_gpio_clr(uint8_t pin); /// Reads the current level on the specified /// pin and returns either HIGH or LOW. Works whether or not the pin /// is an input or an output. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. /// \return the current level either HIGH or LOW - extern uint8_t bcm2845_gpio_lev(uint8_t pin); + extern uint8_t bcm2835_gpio_lev(uint8_t pin); /// Event Detect Status. /// Tests whether the specified pin has detected a level or edge - /// as requested by bcm2845_gpio_ren(), bcm2845_gpio_fen(), bcm2845_gpio_hen(), - /// bcm2845_gpio_len(), bcm2845_gpio_aren(), bcm2845_gpio_afen(). - /// Clear the flag for a given pin by calling bcm2845_gpio_set_eds(pin); + /// as requested by bcm2835_gpio_ren(), bcm2835_gpio_fen(), bcm2835_gpio_hen(), + /// bcm2835_gpio_len(), bcm2835_gpio_aren(), bcm2835_gpio_afen(). + /// Clear the flag for a given pin by calling bcm2835_gpio_set_eds(pin); /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. /// \return HIGH if the event detect status for th given pin is true. - extern uint8_t bcm2845_gpio_eds(uint8_t pin); + extern uint8_t bcm2835_gpio_eds(uint8_t pin); /// Sets the Event Detect Status register for a given pin to 1, /// which has the effect of clearing the flag. Use this afer seeing /// an Event Detect Status on the pin. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - extern void bcm2845_gpio_set_eds(uint8_t pin); + extern void bcm2835_gpio_set_eds(uint8_t pin); /// Enable Rising Edge Detect Enable for the specified pin. /// When a rising edge is detected, sets the appropriate pin in Event Detect Status. @@ -373,7 +374,7 @@ extern "C" { /// system clock and then it is looking for a “011” pattern on the sampled signal. This /// has the effect of suppressing glitches. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - extern void bcm2845_gpio_ren(uint8_t pin); + extern void bcm2835_gpio_ren(uint8_t pin); /// Enable Falling Edge Detect Enable for the specified pin. /// When a falling edge is detected, sets the appropriate pin in Event Detect Status. @@ -382,55 +383,55 @@ extern "C" { /// system clock and then it is looking for a “100” pattern on the sampled signal. This /// has the effect of suppressing glitches. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - extern void bcm2845_gpio_fen(uint8_t pin); + extern void bcm2835_gpio_fen(uint8_t pin); /// Enable High Detect Enable for the specified pin. /// When a HIGH level is detected on the pin, sets the appropriate pin in Event Detect Status. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - extern void bcm2845_gpio_hen(uint8_t pin); + extern void bcm2835_gpio_hen(uint8_t pin); /// Enable Low Detect Enable for the specified pin. /// When a LOW level is detected on the pin, sets the appropriate pin in Event Detect Status. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - extern void bcm2845_gpio_len(uint8_t pin); + extern void bcm2835_gpio_len(uint8_t pin); /// Enable Asynchronous Rising Edge Detect Enable for the specified pin. /// When a rising edge is detected, sets the appropriate pin in Event Detect Status. /// Asynchronous means the incoming signal is not sampled by the system clock. As such /// rising edges of very short duration can be detected. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - extern void bcm2845_gpio_aren(uint8_t pin); + extern void bcm2835_gpio_aren(uint8_t pin); /// Enable Asynchronous Falling Edge Detect Enable for the specified pin. /// When a falling edge is detected, sets the appropriate pin in Event Detect Status. /// Asynchronous means the incoming signal is not sampled by the system clock. As such /// falling edges of very short duration can be detected. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - extern void bcm2845_gpio_afen(uint8_t pin); + extern void bcm2835_gpio_afen(uint8_t pin); /// Sets the Pull-up/down register for the given pin. This is - /// used with bcm2845_gpio_pudclk() to set the Pull-up/down resistor for the given pin. - /// However, it is usually more convenient to use bcm2845_gpio_set_pud(). + /// used with bcm2835_gpio_pudclk() to set the Pull-up/down resistor for the given pin. + /// However, it is usually more convenient to use bcm2835_gpio_set_pud(). /// \param[in] pud The desired Pull-up/down mode. One of BCM2835_GPIO_PUD_* from bcm2835PUDControl - /// \sa bcm2845_gpio_set_pud() - extern void bcm2845_gpio_pud(uint8_t pud); + /// \sa bcm2835_gpio_set_pud() + extern void bcm2835_gpio_pud(uint8_t pud); - /// Clocks the Pull-up/down value set earlier by bcm2845_gpio_pud() into the pin. + /// Clocks the Pull-up/down value set earlier by bcm2835_gpio_pud() into the pin. /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. - /// \param[in] on HIGH to clock the value from bcm2845_gpio_pud() into the pin. + /// \param[in] on HIGH to clock the value from bcm2835_gpio_pud() into the pin. /// LOW to remove the clock. - /// \sa bcm2845_gpio_set_pud() - extern void bcm2845_gpio_pudclk(uint8_t pin, uint8_t on); + /// \sa bcm2835_gpio_set_pud() + extern void bcm2835_gpio_pudclk(uint8_t pin, uint8_t on); /// Reads and returns the Pad Control for the given GPIO group. /// \param[in] group The GPIO pad group number, one of BCM2835_PAD_GROUP_GPIO_* /// \return Mask of bits from BCM2835_PAD_* from \ref bcm2835PadGroup - extern uint32_t bcm2845_gpio_pad(uint8_t group); + extern uint32_t bcm2835_gpio_pad(uint8_t group); /// Sets the Pad Control for the given GPIO group. /// \param[in] group The GPIO pad group number, one of BCM2835_PAD_GROUP_GPIO_* /// \param[in] control Mask of bits from BCM2835_PAD_* from \ref bcm2835PadGroup - extern void bcm2845_gpio_set_pad(uint8_t group, uint32_t control); + extern void bcm2835_gpio_set_pad(uint8_t group, uint32_t control); /// Delays for the specified number of milliseconds. /// Uses nanosleep(), and therefore does not use CPU until the time is up. @@ -445,13 +446,13 @@ extern "C" { /// Sets the output state of the specified pin /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. /// \param[in] on HIGH sets the output to HIGH and LOW to LOW. - extern void bcm2845_gpio_write(uint8_t pin, uint8_t on); + extern void bcm2835_gpio_write(uint8_t pin, uint8_t on); /// Sets the Pull-up/down mode for the specified pin. This is more convenient than - /// clocking the mode in with bcm2845_gpio_pud() and bcm2845_gpio_pudclk(). + /// clocking the mode in with bcm2835_gpio_pud() and bcm2835_gpio_pudclk(). /// \param[in] pin GPIO number, or one of RPI_GPIO_P1_* from \ref RPiGPIOPin. /// \param[in] pud The desired Pull-up/down mode. One of BCM2835_GPIO_PUD_* from bcm2835PUDControl - extern void bcm2845_gpio_set_pud(uint8_t pin, uint8_t pud); + extern void bcm2835_gpio_set_pud(uint8_t pin, uint8_t pud); /// @} #ifdef __cplusplus