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Support custom baudrates on Linux.

This commit is contained in:
Martin Ling 2013-11-21 00:35:51 +00:00
parent 31b3a8f5b5
commit 7a6d2196e0
5 changed files with 153 additions and 7 deletions
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2
Makefile.am
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@ -24,7 +24,7 @@ AM_CPPFLAGS = -I$(top_srcdir)
lib_LTLIBRARIES = libserialport.la
libserialport_la_SOURCES = serialport.c
libserialport_la_SOURCES = serialport.c linux_termios.c
libserialport_la_LIBADD = $(LIBOBJS)

1
configure.ac
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@ -107,6 +107,7 @@ AC_CHECK_HEADERS([errno.h fcntl.h stddef.h sys/ioctl.h termios.h])
AC_C_INLINE
AC_TYPE_SIZE_T
AC_TYPE_SSIZE_T
AC_CHECK_TYPE([struct termios2],[AC_DEFINE(HAVE_TERMIOS2, 1)],[],[[#include <linux/termios.h>]])
# Checks for library functions.
AC_CHECK_FUNCS([strerror])

73
linux_termios.c Normal file
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@ -0,0 +1,73 @@
/*
* This file is part of the libserialport project.
*
* Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/termios.h>
#include "linux_termios.h"
int get_termios_get_ioctl(void)
{
#ifdef HAVE_TERMIOS2
return TCGETS2;
#else
return TCGETS;
#endif
}
int get_termios_set_ioctl(void)
{
#ifdef HAVE_TERMIOS2
return TCSETS2;
#else
return TCSETS;
#endif
}
int get_termios_size(void)
{
#ifdef HAVE_TERMIOS2
return sizeof(struct termios2);
#else
return sizeof(struct termios);
#endif
}
int get_termios_speed(void *data)
{
#ifdef HAVE_TERMIOS2
struct termios2 *term = (struct termios2 *) data;
#else
struct termios *term = (struct termios *) data;
#endif
if (term->c_ispeed != term->c_ospeed)
return -1;
else
return term->c_ispeed;
}
void set_termios_speed(void *data, int speed)
{
#ifdef HAVE_TERMIOS2
struct termios2 *term = (struct termios2 *) data;
#else
struct termios *term = (struct termios *) data;
#endif
term->c_cflag &= ~CBAUD;
term->c_cflag |= BOTHER;
term->c_ispeed = term->c_ospeed = speed;
}

24
linux_termios.h Normal file
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@ -0,0 +1,24 @@
/*
* This file is part of the libserialport project.
*
* Copyright (C) 2013 Martin Ling <martin-libserialport@earth.li>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation, either version 3 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 Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
int get_termios_get_ioctl(void);
int get_termios_set_ioctl(void);
int get_termios_size(void);
int get_termios_speed(void *data);
void set_termios_speed(void *data, int speed);

60
serialport.c
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@ -44,6 +44,7 @@
#ifdef __linux__
#include "libudev.h"
#include "linux/serial.h"
#include "linux_termios.h"
#endif
#include "libserialport.h"
@ -94,6 +95,8 @@ const struct std_baudrate std_baudrates[] = {
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
#define NUM_STD_BAUDRATES ARRAY_SIZE(std_baudrates)
#define TRY(x) do { int ret = x; if (ret != SP_OK) return ret; } while (0)
/* Helper functions. */
static enum sp_return validate_port(struct sp_port *port);
static struct sp_port **list_append(struct sp_port **list, const char *portname);
@ -558,6 +561,41 @@ enum sp_return sp_read(struct sp_port *port, void *buf, size_t count)
#endif
}
#ifdef __linux__
static enum sp_return get_baudrate(int fd, int *baudrate)
{
void *data;
if (!(data = malloc(get_termios_size())))
return SP_ERR_MEM;
if (ioctl(fd, get_termios_get_ioctl(), data) < 0)
return SP_ERR_FAIL;
*baudrate = get_termios_speed(data);
return SP_OK;
}
static enum sp_return set_baudrate(int fd, int baudrate)
{
void *data;
if (!(data = malloc(get_termios_size())))
return SP_ERR_MEM;
if (ioctl(fd, get_termios_get_ioctl(), data) < 0)
return SP_ERR_FAIL;
set_termios_speed(data, baudrate);
if (ioctl(fd, get_termios_set_ioctl(), data) < 0)
return SP_ERR_FAIL;
return SP_OK;
}
#endif
static enum sp_return get_config(struct sp_port *port, struct port_data *data,
struct sp_port_config *config)
{
@ -669,6 +707,8 @@ static enum sp_return get_config(struct sp_port *port, struct port_data *data,
if (i == NUM_STD_BAUDRATES) {
#ifdef __APPLE__
config->baudrate = (int)data->term.c_ispeed;
#elif defined(__linux__)
TRY(get_baudrate(port->fd, &config->baudrate));
#else
config->baudrate = -1;
#endif
@ -727,7 +767,7 @@ static enum sp_return get_config(struct sp_port *port, struct port_data *data,
return SP_OK;
}
static enum sp_return set_config(struct sp_port *port, struct port_data *data,
static enum sp_return set_config(struct sp_port *port, struct port_data *data,
const struct sp_port_config *config)
{
unsigned int i;
@ -736,6 +776,9 @@ static enum sp_return set_config(struct sp_port *port, struct port_data *data,
baud_nonstd = B0;
#endif
#ifdef __linux__
int baud_nonstd = 0;
#endif
#ifdef _WIN32
if (config->baudrate >= 0) {
@ -870,6 +913,8 @@ static enum sp_return set_config(struct sp_port *port, struct port_data *data,
#else /* !_WIN32 */
int controlbits;
if (config->baudrate >= 0) {
for (i = 0; i < NUM_STD_BAUDRATES; i++) {
if (config->baudrate == std_baudrates[i].value) {
@ -889,6 +934,8 @@ static enum sp_return set_config(struct sp_port *port, struct port_data *data,
if (cfsetspeed(&data->term, B9600) < 0)
return SP_ERR_FAIL;
baud_nonstd = config->baudrate;
#elif defined(__linux__)
baud_nonstd = 1;
#else
return SP_ERR_ARG;
#endif
@ -971,7 +1018,7 @@ static enum sp_return set_config(struct sp_port *port, struct port_data *data,
if (config->rts == SP_RTS_FLOW_CONTROL) {
data->term.c_iflag |= CRTSCTS;
} else {
int controlbits = TIOCM_RTS;
controlbits = TIOCM_RTS;
if (ioctl(port->fd, config->rts == SP_RTS_ON ? TIOCMBIS : TIOCMBIC,
&controlbits) < 0)
return SP_ERR_FAIL;
@ -985,7 +1032,7 @@ static enum sp_return set_config(struct sp_port *port, struct port_data *data,
return SP_ERR_ARG;
if (config->dtr >= 0) {
int controlbits = TIOCM_DTR;
controlbits = TIOCM_DTR;
if (ioctl(port->fd, config->dtr == SP_DTR_ON ? TIOCMBIS : TIOCMBIC,
&controlbits) < 0)
return SP_ERR_FAIL;
@ -1023,15 +1070,16 @@ static enum sp_return set_config(struct sp_port *port, struct port_data *data,
if (cfsetspeed(&data->term, baud_nonstd) < 0)
return SP_ERR_FAIL;
}
#endif /* __APPLE__ */
#elif defined(__linux__)
if (baud_nonstd)
TRY(set_baudrate(port->fd, config->baudrate));
#endif
#endif /* !_WIN32 */
return SP_OK;
}
#define TRY(x) do { int ret = x; if (ret != SP_OK) return ret; } while (0)
enum sp_return sp_set_config(struct sp_port *port, const struct sp_port_config *config)
{
struct port_data data;