mirror of
https://github.com/mariusgreuel/avrdude.git
synced 2025-12-13 09:24:55 +00:00
patch #7165 Add support for bitbanging GPIO lines using the Linux sysf GPIO interface
* doc/avrdude.texi,avrdude.1: added doc for linuxgpio * avrdude.conf.in: added template for linuxgpio programmer * config_gram.y: pin numbers restricted to [PIN_MIN, PIN_MAX] * pindefs.h: added PIN_MIN, PIN_MAX, removed unused LED_ON/OFF * configure.ac: configure option enable-linuxgpio, print of enabled options * linuxgpio.[ch]: new source for linuxgpio programmer * Makefile.am: added linuxgpio to sources list * pgm_type.c: added linuxgpio to programmer types list git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk/avrdude@1132 81a1dc3b-b13d-400b-aceb-764788c761c2
This commit is contained in:
Rene Liebscher
349
linuxgpio.c
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349
linuxgpio.c
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/*
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* avrdude - A Downloader/Uploader for AVR device programmers
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* Support for bitbanging GPIO pins using the /sys/class/gpio interface
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*
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* Copyright (C) 2013 Radoslav Kolev <radoslav@kolev.info>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "ac_cfg.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include "avrdude.h"
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#include "avr.h"
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#include "pindefs.h"
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#include "pgm.h"
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#include "bitbang.h"
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#if HAVE_LINUXGPIO
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/*
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* GPIO user space helpers
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*
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* Copyright 2009 Analog Devices Inc.
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* Michael Hennerich (hennerich@blackfin.uclinux.org)
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*
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* Licensed under the GPL-2 or later
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*/
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/*
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* GPIO user space helpers
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* The following functions are acting on an "unsigned gpio" argument, which corresponds to the
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* gpio numbering scheme in the kernel (starting from 0).
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* The higher level functions use "int pin" to specify the pins with an offset of 1:
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* gpio = pin - 1;
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*/
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#define GPIO_DIR_IN 0
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#define GPIO_DIR_OUT 1
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static int linuxgpio_export(unsigned int gpio)
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{
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int fd, len, r;
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char buf[11];
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fd = open("/sys/class/gpio/export", O_WRONLY);
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if (fd < 0) {
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perror("Can't open /sys/class/gpio/export");
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return fd;
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}
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len = snprintf(buf, sizeof(buf), "%d", gpio);
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r = write(fd, buf, len);
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close(fd);
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return r;
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}
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static int linuxgpio_unexport(unsigned int gpio)
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{
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int fd, len, r;
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char buf[11];
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fd = open("/sys/class/gpio/unexport", O_WRONLY);
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if (fd < 0) {
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perror("Can't open /sys/class/gpio/unexport");
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return fd;
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}
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len = snprintf(buf, sizeof(buf), "%d", gpio);
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r = write(fd, buf, len);
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close(fd);
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return r;
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}
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static int linuxgpio_openfd(unsigned int gpio)
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{
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char filepath[60];
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snprintf(filepath, sizeof(filepath), "/sys/class/gpio/gpio%d/value", gpio);
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return (open(filepath, O_RDWR));
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}
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static int linuxgpio_dir(unsigned int gpio, unsigned int dir)
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{
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int fd, r;
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char buf[60];
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snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/direction", gpio);
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fd = open(buf, O_WRONLY);
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if (fd < 0) {
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perror("Can't open gpioX/direction");
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return fd;
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}
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if (dir == GPIO_DIR_OUT)
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r = write(fd, "out", 4);
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else
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r = write(fd, "in", 3);
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close(fd);
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return r;
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}
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static int linuxgpio_dir_out(unsigned int gpio)
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{
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return linuxgpio_dir(gpio, GPIO_DIR_OUT);
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}
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static int linuxgpio_dir_in(unsigned int gpio)
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{
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return linuxgpio_dir(gpio, GPIO_DIR_IN);
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}
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/*
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* End of GPIO user space helpers
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*/
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#define N_GPIO (PIN_MAX + 1)
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/*
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* an array which holds open FDs to /sys/class/gpio/gpioXX/value for all needed pins
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*/
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static int linuxgpio_fds[N_GPIO] ;
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static int linuxgpio_setpin(PROGRAMMER * pgm, int pin, int value)
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{
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int r;
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if (pin & PIN_INVERSE)
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{
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value = !value;
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pin &= PIN_MASK;
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}
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if ( linuxgpio_fds[pin] < 0 )
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return -1;
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if (value)
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r = write(linuxgpio_fds[pin], "1", 1);
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else
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r = write(linuxgpio_fds[pin], "0", 1);
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if (r!=1) return -1;
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if (pgm->ispdelay > 1)
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bitbang_delay(pgm->ispdelay);
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return 0;
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}
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static int linuxgpio_getpin(PROGRAMMER * pgm, int pin)
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{
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unsigned char invert=0;
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char c;
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if (pin & PIN_INVERSE)
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{
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invert = 1;
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pin &= PIN_MASK;
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}
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if ( linuxgpio_fds[pin] < 0 )
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return -1;
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if (lseek(linuxgpio_fds[pin], 0, SEEK_SET)<0)
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return -1;
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if (read(linuxgpio_fds[pin], &c, 1)!=1)
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return -1;
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if (c=='0')
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return 0+invert;
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else if (c=='1')
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return 1-invert;
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else
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return -1;
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}
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static int linuxgpio_highpulsepin(PROGRAMMER * pgm, int pin)
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{
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if ( linuxgpio_fds[pin & PIN_MASK] < 0 )
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return -1;
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linuxgpio_setpin(pgm, pin, 1);
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linuxgpio_setpin(pgm, pin, 0);
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return 0;
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}
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static void linuxgpio_display(PROGRAMMER *pgm, const char *p)
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{
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/* MAYBE */
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}
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static void linuxgpio_enable(PROGRAMMER *pgm)
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{
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/* nothing */
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}
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static void linuxgpio_disable(PROGRAMMER *pgm)
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{
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/* nothing */
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}
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static void linuxgpio_powerup(PROGRAMMER *pgm)
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{
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/* nothing */
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}
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static void linuxgpio_powerdown(PROGRAMMER *pgm)
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{
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/* nothing */
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}
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static int linuxgpio_open(PROGRAMMER *pgm, char *port)
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{
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int r, i, pin;
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bitbang_check_prerequisites(pgm);
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for (i=0; i<N_GPIO; i++)
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linuxgpio_fds[i] = -1;
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//Avrdude assumes that if a pin number is 0 it means not used/available
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//this causes a problem because 0 is a valid GPIO number in Linux sysfs.
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//To avoid annoying off by one pin numbering we assume SCK, MOSI, MISO
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//and RESET pins are always defined in avrdude.conf, even as 0. If they're
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//not programming will not work anyway. The drawbacks of this approach are
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//that unwanted toggling of GPIO0 can occur and that other optional pins
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//mostry LED status, can't be set to GPIO0. It can be fixed when a better
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//solution exists.
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for (i=0; i<N_PINS; i++) {
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if ( pgm->pinno[i] != 0 ||
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i == PIN_AVR_RESET ||
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i == PIN_AVR_SCK ||
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i == PIN_AVR_MOSI ||
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i == PIN_AVR_MISO ) {
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pin = pgm->pinno[i] & PIN_MASK;
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if ((r=linuxgpio_export(pin)) < 0) {
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fprintf(stderr, "Can't export GPIO %d, already exported/busy?: %s",
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pin, strerror(errno));
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return r;
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}
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if (i == PIN_AVR_MISO)
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r=linuxgpio_dir_in(pin);
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else
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r=linuxgpio_dir_out(pin);
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if (r < 0)
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return r;
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if ((linuxgpio_fds[pin]=linuxgpio_openfd(pin)) < 0)
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return linuxgpio_fds[pin];
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}
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}
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return(0);
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}
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static void linuxgpio_close(PROGRAMMER *pgm)
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{
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int i, reset_pin;
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reset_pin = pgm->pinno[PIN_AVR_RESET] & PIN_MASK;
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//first configure all pins as input, except RESET
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//this should avoid possible conflicts when AVR firmware starts
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for (i=0; i<N_GPIO; i++) {
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if (linuxgpio_fds[i] >= 0 && i != reset_pin) {
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close(linuxgpio_fds[i]);
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linuxgpio_dir_in(i);
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linuxgpio_unexport(i);
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}
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}
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//configure RESET as input, if there's external pull up it will go high
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if (linuxgpio_fds[reset_pin] >= 0) {
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close(linuxgpio_fds[reset_pin]);
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linuxgpio_dir_in(reset_pin);
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linuxgpio_unexport(reset_pin);
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}
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}
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void linuxgpio_initpgm(PROGRAMMER *pgm)
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{
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strcpy(pgm->type, "linuxgpio");
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pgm->rdy_led = bitbang_rdy_led;
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pgm->err_led = bitbang_err_led;
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pgm->pgm_led = bitbang_pgm_led;
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pgm->vfy_led = bitbang_vfy_led;
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pgm->initialize = bitbang_initialize;
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pgm->display = linuxgpio_display;
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pgm->enable = linuxgpio_enable;
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pgm->disable = linuxgpio_disable;
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pgm->powerup = linuxgpio_powerup;
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pgm->powerdown = linuxgpio_powerdown;
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pgm->program_enable = bitbang_program_enable;
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pgm->chip_erase = bitbang_chip_erase;
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pgm->cmd = bitbang_cmd;
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pgm->open = linuxgpio_open;
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pgm->close = linuxgpio_close;
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pgm->setpin = linuxgpio_setpin;
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pgm->getpin = linuxgpio_getpin;
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pgm->highpulsepin = linuxgpio_highpulsepin;
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pgm->read_byte = avr_read_byte_default;
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pgm->write_byte = avr_write_byte_default;
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}
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const char linuxgpio_desc[] = "GPIO bitbanging using the Linux sysfs interface";
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#else /* !HAVE_LINUXGPIO */
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void linuxgpio_initpgm(PROGRAMMER * pgm)
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{
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fprintf(stderr,
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"%s: Linux sysfs GPIO support not available in this configuration\n",
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progname);
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}
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const char linuxgpio_desc[] = "GPIO bitbanging using the Linux sysfs interface (not available)";
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#endif /* HAVE_LINUXGPIO */
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