318 lines
7.2 KiB
C
318 lines
7.2 KiB
C
/*
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* avrdude - A Downloader/Uploader for AVR device programmers
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* Copyright (C) 2000, 2001, 2002, 2003 Brian S. Dean <bsd@bsdhome.com>
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* Copyright (C) 2005 Juliane Holzt <avrdude@juliane.holzt.de>
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* Copyright (C) 2006 Joerg Wunsch <j@uriah.heep.sax.de>
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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, see <http://www.gnu.org/licenses/>.
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*/
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/* $Id$ */
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/*
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* Posix serial bitbanging interface for avrdude.
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*/
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#if !defined(WIN32)
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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 <sys/ioctl.h>
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#include <termios.h>
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#include "avrdude.h"
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#include "libavrdude.h"
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#include "bitbang.h"
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#include "serbb.h"
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#undef DEBUG
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static struct termios oldmode;
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/*
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serial port/pin mapping
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1 cd <-
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2 (rxd) <-
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3 txd ->
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4 dtr ->
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5 GND
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6 dsr <-
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7 rts ->
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8 cts <-
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9 ri <-
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*/
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#define DB9PINS 9
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static int serregbits[DB9PINS + 1] =
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{ 0, TIOCM_CD, 0, 0, TIOCM_DTR, 0, TIOCM_DSR, TIOCM_RTS, TIOCM_CTS, TIOCM_RI };
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#ifdef DEBUG
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static char *serpins[DB9PINS + 1] =
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{ "NONE", "CD", "RXD", "TXD", "DTR", "GND", "DSR", "RTS", "CTS", "RI" };
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#endif
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static int serbb_setpin(const PROGRAMMER *pgm, int pinfunc, int value) {
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unsigned int ctl;
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int r;
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if(pinfunc < 0 || pinfunc >= N_PINS)
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return -1;
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int pin = pgm->pinno[pinfunc]; // get its value
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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 ( pin < 1 || pin > DB9PINS )
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return -1;
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#ifdef DEBUG
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msg_info("%s to %d\n", serpins[pin], value);
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#endif
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switch ( pin )
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{
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case 3: /* txd */
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r = ioctl(pgm->fd.ifd, value ? TIOCSBRK : TIOCCBRK, 0);
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if (r < 0) {
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pmsg_ext_error("ioctl(\"TIOCxBRK\"): %s\n", strerror(errno));
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return -1;
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}
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break;
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case 4: /* dtr */
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case 7: /* rts */
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r = ioctl(pgm->fd.ifd, TIOCMGET, &ctl);
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if (r < 0) {
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pmsg_ext_error("ioctl(\"TIOCMGET\"): %s\n", strerror(errno));
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return -1;
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}
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if (value)
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ctl |= serregbits[pin];
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else
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ctl &= ~(serregbits[pin]);
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r = ioctl(pgm->fd.ifd, TIOCMSET, &ctl);
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if (r < 0) {
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pmsg_ext_error("ioctl(\"TIOCMSET\"): %s\n", strerror(errno));
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return -1;
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}
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break;
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default: /* impossible */
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return -1;
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}
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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 serbb_getpin(const PROGRAMMER *pgm, int pinfunc) {
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unsigned int ctl;
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unsigned char invert;
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int r;
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if(pinfunc < 0 || pinfunc >= N_PINS)
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return -1;
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int pin = pgm->pinno[pinfunc]; // get its value
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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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} else
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invert = 0;
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if ( pin < 1 || pin > DB9PINS )
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return(-1);
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switch ( pin )
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{
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case 2: /* rxd, currently not implemented, FIXME */
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return(-1);
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case 1: /* cd */
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case 6: /* dsr */
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case 8: /* cts */
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case 9: /* ri */
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r = ioctl(pgm->fd.ifd, TIOCMGET, &ctl);
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if (r < 0) {
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pmsg_ext_error("ioctl(\"TIOCMGET\"): %s\n", strerror(errno));
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return -1;
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}
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if ( !invert )
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{
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#ifdef DEBUG
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msg_info("%s is %d\n", serpins[pin], ctl & serregbits[pin]? 1: 0);
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#endif
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return ctl & serregbits[pin]? 1: 0;
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}
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else
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{
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#ifdef DEBUG
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msg_info("%s is %d (~)\n", serpins[pin], ctl & serregbits[pin]? 0: 1);
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#endif
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return ctl & serregbits[pin]? 0: 1;
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}
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default: /* impossible */
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return(-1);
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}
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}
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static int serbb_highpulsepin(const PROGRAMMER *pgm, int pinfunc) {
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if (pinfunc < 0 || pinfunc >= N_PINS)
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return -1;
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int pin = pgm->pinno[pinfunc]; // replace pin name by its value
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if ( (pin & PIN_MASK) < 1 || (pin & PIN_MASK) > DB9PINS )
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return -1;
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serbb_setpin(pgm, pinfunc, 1);
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serbb_setpin(pgm, pinfunc, 0);
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return 0;
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}
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static void serbb_display(const PROGRAMMER *pgm, const char *p) {
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/* MAYBE */
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}
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static void serbb_enable(PROGRAMMER *pgm, const AVRPART *p) {
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/* nothing */
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}
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static void serbb_disable(const PROGRAMMER *pgm) {
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/* nothing */
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}
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static void serbb_powerup(const PROGRAMMER *pgm) {
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/* nothing */
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}
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static void serbb_powerdown(const PROGRAMMER *pgm) {
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/* nothing */
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}
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static int serbb_open(PROGRAMMER *pgm, const char *port) {
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struct termios mode;
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int flags;
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int r;
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if (bitbang_check_prerequisites(pgm) < 0)
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return -1;
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/* adapted from uisp code */
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pgm->fd.ifd = open(port, O_RDWR | O_NOCTTY | O_NONBLOCK);
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if (pgm->fd.ifd < 0) {
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pmsg_ext_error("%s: %s\n", port, strerror(errno));
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return(-1);
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}
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r = tcgetattr(pgm->fd.ifd, &mode);
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if (r < 0) {
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pmsg_ext_error("%s, tcgetattr(): %s\n", port, strerror(errno));
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return(-1);
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}
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oldmode = mode;
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mode.c_iflag = IGNBRK | IGNPAR;
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mode.c_oflag = 0;
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mode.c_cflag = CLOCAL | CREAD | CS8 | B9600;
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mode.c_cc [VMIN] = 1;
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mode.c_cc [VTIME] = 0;
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r = tcsetattr(pgm->fd.ifd, TCSANOW, &mode);
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if (r < 0) {
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pmsg_ext_error("%s, tcsetattr(): %s", port, strerror(errno));
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return(-1);
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}
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/* Clear O_NONBLOCK flag. */
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flags = fcntl(pgm->fd.ifd, F_GETFL, 0);
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if (flags == -1)
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{
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pmsg_ext_error("cannot get flags: %s\n", strerror(errno));
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return(-1);
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}
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flags &= ~O_NONBLOCK;
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if (fcntl(pgm->fd.ifd, F_SETFL, flags) == -1)
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{
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pmsg_ext_error("cannot clear nonblock flag: %s\n", strerror(errno));
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return(-1);
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}
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return(0);
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}
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static void serbb_close(PROGRAMMER *pgm) {
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if (pgm->fd.ifd != -1)
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{
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(void)tcsetattr(pgm->fd.ifd, TCSANOW, &oldmode);
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pgm->setpin(pgm, PIN_AVR_RESET, 1);
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close(pgm->fd.ifd);
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}
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return;
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}
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const char serbb_desc[] = "Serial port bitbanging";
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void serbb_initpgm(PROGRAMMER *pgm) {
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strcpy(pgm->type, "SERBB");
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pgm_fill_old_pins(pgm); // TODO to be removed if old pin data no longer needed
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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 = serbb_display;
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pgm->enable = serbb_enable;
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pgm->disable = serbb_disable;
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pgm->powerup = serbb_powerup;
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pgm->powerdown = serbb_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->cmd_tpi = bitbang_cmd_tpi;
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pgm->open = serbb_open;
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pgm->close = serbb_close;
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pgm->setpin = serbb_setpin;
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pgm->getpin = serbb_getpin;
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pgm->highpulsepin = serbb_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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#endif /* WIN32 */
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