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serial_posix.c    240 lines (189 with data), 5.8 kB

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/*
stm32flash - Open Source ST STM32 flash program for *nix
Copyright (C) 2010 Geoffrey McRae <geoff@spacevs.com>
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <termios.h>
#include <stdio.h>
#include <assert.h>
#include <sys/ioctl.h>
#include "serial.h"
struct serial {
int fd;
struct termios oldtio;
struct termios newtio;
char configured;
serial_baud_t baud;
serial_bits_t bits;
serial_parity_t parity;
serial_stopbit_t stopbit;
};
serial_t* serial_open(const char *device) {
serial_t *h = calloc(sizeof(serial_t), 1);
h->fd = open(device, O_RDWR | O_NOCTTY | O_NDELAY);
if (h->fd < 0) {
free(h);
return NULL;
}
fcntl(h->fd, F_SETFL, 0);
tcgetattr(h->fd, &h->oldtio);
tcgetattr(h->fd, &h->newtio);
return h;
}
void serial_close(serial_t *h) {
assert(h && h->fd > -1);
serial_flush(h);
tcsetattr(h->fd, TCSANOW, &h->oldtio);
close(h->fd);
free(h);
}
void serial_flush(const serial_t *h) {
assert(h && h->fd > -1);
tcflush(h->fd, TCIFLUSH);
}
void serial_dtr_reset(serial_t *h) {
int status;
ioctl(h->fd, TIOCMGET, &status);
status &= ~TIOCM_DTR;
ioctl(h->fd, TIOCMSET, &status);
usleep(5000);
status |= TIOCM_DTR;
ioctl(h->fd, TIOCMSET, &status);
}
serial_err_t serial_setup(serial_t *h, const serial_baud_t baud, const serial_bits_t bits, const serial_parity_t parity, const serial_stopbit_t stopbit) {
assert(h && h->fd > -1);
speed_t port_baud;
tcflag_t port_bits;
tcflag_t port_parity;
tcflag_t port_stop;
switch(baud) {
case SERIAL_BAUD_1200 : port_baud = B1200 ; break;
case SERIAL_BAUD_1800 : port_baud = B1800 ; break;
case SERIAL_BAUD_2400 : port_baud = B2400 ; break;
case SERIAL_BAUD_4800 : port_baud = B4800 ; break;
case SERIAL_BAUD_9600 : port_baud = B9600 ; break;
case SERIAL_BAUD_19200 : port_baud = B19200 ; break;
case SERIAL_BAUD_38400 : port_baud = B38400 ; break;
case SERIAL_BAUD_57600 : port_baud = B57600 ; break;
case SERIAL_BAUD_115200: port_baud = B115200; break;
case SERIAL_BAUD_INVALID:
default:
return SERIAL_ERR_INVALID_BAUD;
}
switch(bits) {
case SERIAL_BITS_5: port_bits = CS5; break;
case SERIAL_BITS_6: port_bits = CS6; break;
case SERIAL_BITS_7: port_bits = CS7; break;
case SERIAL_BITS_8: port_bits = CS8; break;
default:
return SERIAL_ERR_INVALID_BITS;
}
switch(parity) {
case SERIAL_PARITY_NONE: port_parity = 0; break;
case SERIAL_PARITY_EVEN: port_parity = INPCK | PARENB; break;
case SERIAL_PARITY_ODD : port_parity = INPCK | PARENB | PARODD; break;
default:
return SERIAL_ERR_INVALID_PARITY;
}
switch(stopbit) {
case SERIAL_STOPBIT_1: port_stop = 0; break;
case SERIAL_STOPBIT_2: port_stop = CSTOPB; break;
default:
return SERIAL_ERR_INVALID_STOPBIT;
}
/* if the port is already configured, no need to do anything */
if (
h->configured &&
h->baud == baud &&
h->bits == bits &&
h->parity == parity &&
h->stopbit == stopbit
) return SERIAL_ERR_OK;
/* reset the settings */
cfmakeraw(&h->newtio);
h->newtio.c_cflag &= ~(CSIZE | CRTSCTS);
h->newtio.c_iflag &= ~(IXON | IXOFF | IXANY | IGNPAR);
h->newtio.c_lflag &= ~(ECHOK | ECHOCTL | ECHOKE);
h->newtio.c_oflag &= ~(OPOST | ONLCR);
/* setup the new settings */
cfsetispeed(&h->newtio, port_baud);
cfsetospeed(&h->newtio, port_baud);
h->newtio.c_cflag |=
port_parity |
port_bits |
port_stop |
CLOCAL |
CREAD;
h->newtio.c_cc[VMIN ] = 0;
h->newtio.c_cc[VTIME] = 30;
/* set the settings */
serial_flush(h);
if (tcsetattr(h->fd, TCSANOW, &h->newtio) != 0)
return SERIAL_ERR_SYSTEM;
/* confirm they were set */
struct termios settings;
tcgetattr(h->fd, &settings);
if (
settings.c_iflag != h->newtio.c_iflag ||
settings.c_oflag != h->newtio.c_oflag ||
settings.c_cflag != h->newtio.c_cflag ||
settings.c_lflag != h->newtio.c_lflag
) return SERIAL_ERR_UNKNOWN;
h->configured = 1;
h->baud = baud;
h->bits = bits;
h->parity = parity;
h->stopbit = stopbit;
return SERIAL_ERR_OK;
}
serial_err_t serial_write(const serial_t *h, const void *buffer, unsigned int len) {
assert(h && h->fd > -1 && h->configured);
ssize_t r;
uint8_t *pos = (uint8_t*)buffer;
while(len > 0) {
r = write(h->fd, pos, len);
if (r < 1) return SERIAL_ERR_SYSTEM;
len -= r;
pos += r;
}
return SERIAL_ERR_OK;
}
serial_err_t serial_read(const serial_t *h, const void *buffer, unsigned int len) {
assert(h && h->fd > -1 && h->configured);
ssize_t r;
uint8_t *pos = (uint8_t*)buffer;
while(len > 0) {
r = read(h->fd, pos, len);
if (r == 0) return SERIAL_ERR_NODATA;
else if (r < 0) return SERIAL_ERR_SYSTEM;
len -= r;
pos += r;
}
return SERIAL_ERR_OK;
}
const char* serial_get_setup_str(const serial_t *h) {
static char str[11];
if (!h->configured)
snprintf(str, sizeof(str), "INVALID");
else
snprintf(str, sizeof(str), "%u %d%c%d",
serial_get_baud_int (h->baud ),
serial_get_bits_int (h->bits ),
serial_get_parity_str (h->parity ),
serial_get_stopbit_int(h->stopbit)
);
return str;
}