Hello,
I have added support for using GPIO lines as a programmer. Many SOCs
have GPIO lines and the standard way to use them from userpace is
through the sysfs gpio interface, so this should be quite universal,
even if a bit slow.
I have tested this on a Bifferboard (http://bifferos.bizhat.com/)
which has a 150MHz x86 CPU and writing 8K to the flash of an AtMega
takes around 30 seconds.
I am sending in a patch against avrdude-5.10, in case someone finds this useful.
Best regards,
Radoslav Kolev
diff -Nur avrdude-5.10/avrdude.conf.in avrdude-5.10-gpio/avrdude.conf.in
--- avrdude-5.10/avrdude.conf.in 2010-01-19 12:39:11.000000000 +0200
+++ avrdude-5.10-gpio/avrdude.conf.in 2010-04-11 23:05:05.000000000 +0300
@@ -833,6 +833,16 @@
miso = 8;
;
+programmer
+ id = "gpio";
+ desc = "Use sysfs interface to bitbang GPIO lines";
+ type = gpio;
+ reset = 11;
+ sck = 13;
+ mosi = 12;
+ miso = 9;
+;
+
# Same as above, different name
# reset=!txd sck=rts mosi=dtr miso=cts
diff -Nur avrdude-5.10/config_gram.y avrdude-5.10-gpio/config_gram.y
--- avrdude-5.10/config_gram.y 2010-01-19 12:39:11.000000000 +0200
+++ avrdude-5.10-gpio/config_gram.y 2010-04-11 01:18:16.000000000 +0300
@@ -39,6 +39,7 @@
#include "stk500.h"
#include "arduino.h"
#include "buspirate.h"
+#include "gpio.h"
#include "stk500v2.h"
#include "stk500generic.h"
#include "avr910.h"
@@ -99,6 +100,7 @@
%token K_DRAGON_JTAG
%token K_DRAGON_PDI
%token K_DRAGON_PP
+%token K_GPIO
%token K_STK500_DEVCODE
%token K_AVR910_DEVCODE
%token K_EEPROM
@@ -437,6 +439,12 @@
buspirate_initpgm(current_prog);
}
} |
+
+ K_TYPE TKN_EQUAL K_GPIO {
+ {
+ gpio_initpgm(current_prog);
+ }
+ } |
K_TYPE TKN_EQUAL K_STK600 {
{
diff -Nur avrdude-5.10/gpio.c avrdude-5.10-gpio/gpio.c
--- avrdude-5.10/gpio.c 1970-01-01 02:00:00.000000000 +0200
+++ avrdude-5.10-gpio/gpio.c 2010-04-12 00:02:17.000000000 +0300
@@ -0,0 +1,299 @@
+/*
+ * avrdude - A Downloader/Uploader for AVR device programmers
+ * Support for bitbanging GPIO pins using the /sys/class/gpio interface
+ *
+ * Copyright (C) 2010 Radoslav Kolev <[email protected]>
+ *
+ * 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
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include "ac_cfg.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "avrdude.h"
+#include "avr.h"
+#include "pindefs.h"
+#include "pgm.h"
+#include "bitbang.h"
+
+
+/*
+ * GPIO user space helpers
+ *
+ * Copyright 2009 Analog Devices Inc.
+ * Michael Hennerich ([email protected])
+ *
+ * Licensed under the GPL-2 or later
+ */
+
+#define GPIO_DIR_IN 0
+#define GPIO_DIR_OUT 1
+
+static int gpio_export(unsigned gpio)
+{
+ int fd, len;
+ char buf[11];
+
+ fd = open("/sys/class/gpio/export", O_WRONLY);
+ if (fd < 0) {
+ perror("gpio/export");
+ return fd;
+ }
+
+ len = snprintf(buf, sizeof(buf), "%d", gpio);
+ write(fd, buf, len);
+ close(fd);
+
+ return 0;
+}
+
+static int gpio_unexport(unsigned gpio)
+{
+ int fd, len;
+ char buf[11];
+
+ fd = open("/sys/class/gpio/unexport", O_WRONLY);
+ if (fd < 0) {
+ perror("gpio/export");
+ return fd;
+ }
+
+ len = snprintf(buf, sizeof(buf), "%d", gpio);
+ write(fd, buf, len);
+ close(fd);
+ return 0;
+}
+
+static int gpio_dir(unsigned gpio, unsigned dir)
+{
+ int fd, len;
+ char buf[60];
+
+ len = snprintf(buf, sizeof(buf), "/sys/class/gpio/gpio%d/direction", gpio);
+
+ fd = open(buf, O_WRONLY);
+ if (fd < 0) {
+ perror("gpio/direction");
+ return fd;
+ }
+
+ if (dir == GPIO_DIR_OUT)
+ write(fd, "out", 4);
+ else
+ write(fd, "in", 3);
+
+ close(fd);
+ return 0;
+}
+
+static int gpio_dir_out(unsigned gpio)
+{
+ return gpio_dir(gpio, GPIO_DIR_OUT);
+}
+
+static int gpio_dir_in(unsigned gpio)
+{
+ return gpio_dir(gpio, GPIO_DIR_IN);
+}
+
+/*
+ * End of GPIO user space helpers
+ */
+
+#define N_GPIO 256
+
+/*
+* an array which holds open FDs to /sys/class/gpio/gpioXX/value for all needed pins
+*/
+static int gpio_fds[N_GPIO] ;
+
+
+static int gpio_setpin(PROGRAMMER * pgm, int pin, int value)
+{
+ int r;
+
+ if (pin & PIN_INVERSE)
+ {
+ value = !value;
+ pin &= PIN_MASK;
+ }
+
+ if ( gpio_fds[pin] < 0 )
+ return -1;
+
+ if (value)
+ r=write(gpio_fds[pin], "1", 1);
+ else
+ r=write(gpio_fds[pin], "0", 1);
+
+ if (r!=1) return -1;
+
+ if (pgm->ispdelay > 1)
+ bitbang_delay(pgm->ispdelay);
+
+ return 0;
+}
+
+static int gpio_getpin(PROGRAMMER * pgm, int pin)
+{
+ unsigned char invert=0;
+ char c;
+
+ if (pin & PIN_INVERSE)
+ {
+ invert = 1;
+ pin &= PIN_MASK;
+ }
+
+ if ( gpio_fds[pin] < 0 )
+ return -1;
+
+ if (lseek(gpio_fds[pin], 0, SEEK_SET)<0)
+ return -1;
+
+ if (read(gpio_fds[pin], &c, 1)!=1)
+ return -1;
+
+ if (c=='0')
+ return 0+invert;
+ else if (c=='1')
+ return 1-invert;
+ else
+ return -1;
+
+}
+
+static int gpio_highpulsepin(PROGRAMMER * pgm, int pin)
+{
+
+ if ( gpio_fds[pin & PIN_MASK] < 0 )
+ return -1;
+
+ gpio_setpin(pgm, pin, 1);
+ gpio_setpin(pgm, pin, 0);
+
+ return 0;
+}
+
+
+
+static void gpio_display(PROGRAMMER *pgm, const char *p)
+{
+ /* MAYBE */
+}
+
+static void gpio_enable(PROGRAMMER *pgm)
+{
+ /* nothing */
+}
+
+static void gpio_disable(PROGRAMMER *pgm)
+{
+ /* nothing */
+}
+
+static void gpio_powerup(PROGRAMMER *pgm)
+{
+ /* nothing */
+}
+
+static void gpio_powerdown(PROGRAMMER *pgm)
+{
+ /* nothing */
+}
+
+static int gpio_open(PROGRAMMER *pgm, char *port)
+{
+ int r,i;
+ char filepath[60];
+
+
+ bitbang_check_prerequisites(pgm);
+
+
+ for (i=0; i<N_GPIO; i++)
+ gpio_fds[i]=-1;
+
+ for (i=0; i<N_PINS; i++) {
+ if (pgm->pinno[i] != 0) {
+ if ((r=gpio_export(pgm->pinno[i])) < 0)
+ return r;
+
+
+ if (i == PIN_AVR_MISO)
+ r=gpio_dir_in(pgm->pinno[i]);
+ else
+ r=gpio_dir_out(pgm->pinno[i]);
+
+ if (r < 0)
+ return r;
+
+ if ((r=snprintf(filepath, sizeof(filepath), "/sys/class/gpio/gpio%d/value", pgm->pinno[i]))<0)
+ return r;
+
+ if ((gpio_fds[pgm->pinno[i]]=open(filepath, O_RDWR))<0)
+ return gpio_fds[pgm->pinno[i]];
+
+ }
+ }
+
+ return(0);
+}
+
+static void gpio_close(PROGRAMMER *pgm)
+{
+ int i;
+
+ pgm->setpin(pgm, pgm->pinno[PIN_AVR_RESET], 1);
+
+ for (i=0; i<N_GPIO; i++)
+ if (gpio_fds[i]>=0) {
+ close(gpio_fds[i]);
+ gpio_unexport(i);
+ }
+ return;
+}
+
+void gpio_initpgm(PROGRAMMER *pgm)
+{
+ strcpy(pgm->type, "GPIO");
+
+ pgm->rdy_led = bitbang_rdy_led;
+ pgm->err_led = bitbang_err_led;
+ pgm->pgm_led = bitbang_pgm_led;
+ pgm->vfy_led = bitbang_vfy_led;
+ pgm->initialize = bitbang_initialize;
+ pgm->display = gpio_display;
+ pgm->enable = gpio_enable;
+ pgm->disable = gpio_disable;
+ pgm->powerup = gpio_powerup;
+ pgm->powerdown = gpio_powerdown;
+ pgm->program_enable = bitbang_program_enable;
+ pgm->chip_erase = bitbang_chip_erase;
+ pgm->cmd = bitbang_cmd;
+ pgm->open = gpio_open;
+ pgm->close = gpio_close;
+ pgm->setpin = gpio_setpin;
+ pgm->getpin = gpio_getpin;
+ pgm->highpulsepin = gpio_highpulsepin;
+ pgm->read_byte = avr_read_byte_default;
+ pgm->write_byte = avr_write_byte_default;
+}
diff -Nur avrdude-5.10/gpio.h avrdude-5.10-gpio/gpio.h
--- avrdude-5.10/gpio.h 1970-01-01 02:00:00.000000000 +0200
+++ avrdude-5.10-gpio/gpio.h 2010-04-11 01:05:25.000000000 +0300
@@ -0,0 +1,35 @@
+/*
+ * avrdude - A Downloader/Uploader for AVR device programmers
+ * Copyright (C) 2000-2004 Brian S. Dean <[email protected]>
+ *
+ * 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
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/* $Id: par.h 722 2007-01-24 22:43:46Z joerg_wunsch $ */
+
+#ifndef gpio_h
+#define gpio_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+void gpio_initpgm (PROGRAMMER * pgm);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff -Nur avrdude-5.10/lexer.l avrdude-5.10-gpio/lexer.l
--- avrdude-5.10/lexer.l 2010-01-19 12:39:11.000000000 +0200
+++ avrdude-5.10-gpio/lexer.l 2010-04-11 01:21:26.000000000 +0300
@@ -146,6 +146,7 @@
enablepageprogramming { yylval=NULL; return K_ENABLEPAGEPROGRAMMING; }
errled { yylval=NULL; return K_ERRLED; }
flash { yylval=NULL; return K_FLASH; }
+gpio { yylval=NULL; return K_GPIO; }
has_jtag { yylval=NULL; return K_HAS_JTAG; }
has_debugwire { yylval=NULL; return K_HAS_DW; }
has_pdi { yylval=NULL; return K_HAS_PDI; }
diff -Nur avrdude-5.10/Makefile.am avrdude-5.10-gpio/Makefile.am
--- avrdude-5.10/Makefile.am 2010-01-19 12:39:11.000000000 +0200
+++ avrdude-5.10-gpio/Makefile.am 2010-04-11 01:20:41.000000000 +0300
@@ -101,6 +101,8 @@
fileio.c \
fileio.h \
freebsd_ppi.h \
+ gpio.c \
+ gpio.h \
jtagmkI.c \
jtagmkI.h \
jtagmkI_private.h \
_______________________________________________
avrdude-dev mailing list
[email protected]
http://lists.nongnu.org/mailman/listinfo/avrdude-dev
