avrdude/ser_posix.c

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