353 lines
6.9 KiB
C
353 lines
6.9 KiB
C
/*
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* avrdude - A Downloader/Uploader for AVR device programmers
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* Copyright (C) 2003 Theodore A. Roth <troth@openavr.org>
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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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/* $Id$ */
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/*
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* Posix serial interface for avrdude.
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*/
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#include <ctype.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 <errno.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <unistd.h>
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extern char *progname;
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extern int verbose;
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struct baud_mapping {
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long baud;
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speed_t speed;
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};
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/* There are a lot more baud rates we could handle, but what's the point? */
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static struct baud_mapping baud_lookup_table [] = {
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{ 1200, B1200 },
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{ 2400, B2400 },
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{ 4800, B4800 },
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{ 9600, B9600 },
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{ 19200, B19200 },
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{ 38400, B38400 },
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{ 57600, B57600 },
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{ 115200, B115200 },
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{ 230400, B230400 },
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{ 0, 0 } /* Terminator. */
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};
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static speed_t serial_baud_lookup(long baud)
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{
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struct baud_mapping *map = baud_lookup_table;
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while (map->baud) {
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if (map->baud == baud)
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return map->speed;
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map++;
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}
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fprintf(stderr, "%s: serial_baud_lookup(): unknown baud rate: %ld",
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progname, baud);
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exit(1);
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}
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static int serial_setattr(int fd, long baud)
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{
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int rc;
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struct termios termios;
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speed_t speed = serial_baud_lookup (baud);
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if (!isatty(fd))
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return -1;
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/*
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* initialize terminal modes
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*/
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rc = tcgetattr(fd, &termios);
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if (rc < 0) {
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fprintf(stderr, "%s: serial_setattr(): tcgetattr() failed, %s",
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progname, strerror(errno));
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return -errno;
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}
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termios.c_iflag = 0;
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termios.c_oflag = 0;
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termios.c_cflag = 0;
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termios.c_cflag |= (CS8 | CREAD | CLOCAL);
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termios.c_lflag = 0;
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termios.c_cc[VMIN] = 1;
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termios.c_cc[VTIME] = 0;
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cfsetospeed(&termios, speed);
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cfsetispeed(&termios, speed);
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rc = tcsetattr(fd, TCSANOW, &termios);
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if (rc < 0) {
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fprintf(stderr, "%s: serial_setattr(): tcsetattr() failed, %s",
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progname, strerror(errno));
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return -errno;
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}
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return 0;
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}
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int serial_open(char * port, int baud)
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{
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int rc;
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int fd;
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/*
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* open the serial port
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*/
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fd = open(port, O_RDWR | O_NOCTTY /*| O_NONBLOCK*/);
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if (fd < 0) {
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fprintf(stderr, "%s: serial_open(): can't open device \"%s\": %s\n",
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progname, port, strerror(errno));
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exit(1);
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}
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/*
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* set serial line attributes
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*/
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rc = serial_setattr(fd, baud);
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if (rc) {
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fprintf(stderr,
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"%s: serial_open(): can't set attributes for device \"%s\"\n",
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progname, port);
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exit(1);
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}
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return fd;
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}
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void serial_close(int fd)
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{
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/* FIXME: Should really restore the terminal to original state here. */
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close(fd);
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}
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int serial_send(int fd, char * buf, size_t buflen)
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{
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struct timeval timeout;
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fd_set wfds;
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int nfds;
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int rc;
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char * p = buf;
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size_t len = buflen;
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if (!len)
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return 0;
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if (verbose > 3)
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{
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fprintf(stderr, "%s: Send: ", progname);
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while (buflen) {
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unsigned char c = *buf;
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if (isprint(c)) {
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fprintf(stderr, "%c ", c);
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}
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else {
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fprintf(stderr, ". ");
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}
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fprintf(stderr, "[%02x] ", c);
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buf++;
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buflen--;
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}
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fprintf(stderr, "\n");
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}
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timeout.tv_sec = 0;
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timeout.tv_usec = 500000;
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while (len) {
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FD_ZERO(&wfds);
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FD_SET(fd, &wfds);
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reselect:
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nfds = select(fd+1, NULL, &wfds, NULL, &timeout);
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if (nfds == 0) {
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fprintf(stderr,
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"%s: serial_send(): programmer is not responding\n",
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progname);
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exit(1);
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}
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else if (nfds == -1) {
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if (errno == EINTR) {
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goto reselect;
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}
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else {
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fprintf(stderr, "%s: serial_send(): select(): %s\n",
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progname, strerror(errno));
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exit(1);
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}
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}
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rc = write(fd, p, 1);
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if (rc < 0) {
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fprintf(stderr, "%s: serial_send(): write error: %s\n",
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progname, strerror(errno));
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exit(1);
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}
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p++;
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len--;
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}
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return 0;
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}
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int serial_recv(int fd, char * buf, size_t buflen)
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{
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struct timeval timeout;
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fd_set rfds;
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int nfds;
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int rc;
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char * p = buf;
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size_t len = 0;
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timeout.tv_sec = 5;
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timeout.tv_usec = 0;
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while (len < buflen) {
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FD_ZERO(&rfds);
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FD_SET(fd, &rfds);
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reselect:
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nfds = select(fd+1, &rfds, NULL, NULL, &timeout);
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if (nfds == 0) {
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fprintf(stderr,
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"%s: serial_recv(): programmer is not responding\n",
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progname);
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exit(1);
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}
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else if (nfds == -1) {
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if (errno == EINTR) {
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goto reselect;
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}
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else {
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fprintf(stderr, "%s: serial_recv(): select(): %s\n",
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progname, strerror(errno));
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exit(1);
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}
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}
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rc = read(fd, p, 1);
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if (rc < 0) {
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fprintf(stderr, "%s: serial_recv(): read error: %s\n",
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progname, strerror(errno));
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exit(1);
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}
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p++;
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len++;
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}
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p = buf;
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if (verbose > 3)
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{
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fprintf(stderr, "%s: Recv: ", progname);
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while (len) {
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unsigned char c = *p;
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if (isprint(c)) {
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fprintf(stderr, "%c ", c);
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}
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else {
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fprintf(stderr, ". ");
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}
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fprintf(stderr, "[%02x] ", c);
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p++;
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len--;
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}
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fprintf(stderr, "\n");
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}
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return 0;
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}
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int serial_drain(int fd, int display)
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{
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struct timeval timeout;
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fd_set rfds;
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int nfds;
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int rc;
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unsigned char buf;
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timeout.tv_sec = 0;
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timeout.tv_usec = 250000;
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if (display) {
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fprintf(stderr, "drain>");
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}
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while (1) {
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FD_ZERO(&rfds);
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FD_SET(fd, &rfds);
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reselect:
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nfds = select(fd+1, &rfds, NULL, NULL, &timeout);
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if (nfds == 0) {
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if (display) {
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fprintf(stderr, "<drain\n");
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}
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break;
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}
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else if (nfds == -1) {
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if (errno == EINTR) {
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goto reselect;
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}
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else {
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fprintf(stderr, "%s: serial_drain(): select(): %s\n",
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progname, strerror(errno));
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exit(1);
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}
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}
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rc = read(fd, &buf, 1);
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if (rc < 0) {
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fprintf(stderr, "%s: serial_drain(): read error: %s\n",
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progname, strerror(errno));
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exit(1);
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}
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if (display) {
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fprintf(stderr, "%02x ", buf);
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}
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}
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return 0;
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}
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