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core/serial: Add utilities to deal with serial ports 

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
This commit is contained in:
Sylvain Munaut 2011-09-02 22:18:24 +02:00
parent bf9d25039c
commit fe28dedd4c
5 changed files with 269 additions and 0 deletions
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9
configure.ac
View File

@ -99,6 +99,14 @@ AC_ARG_ENABLE(msgfile,
[enable_msgfile=$enableval], [enable_msgfile="yes"])
AM_CONDITIONAL(ENABLE_MSGFILE, test x"$enable_msgfile" = x"yes")
AC_ARG_ENABLE(serial,
[AS_HELP_STRING(
[--disable-serial],
[Disable support for the serial helpers],
)],
[enable_serial=$enableval], [enable_serial="yes"])
AM_CONDITIONAL(ENABLE_SERIAL, test x"$enable_serial" = x"yes")
AC_ARG_ENABLE(utilities,
[AS_HELP_STRING(
[--disable-utilities],
@ -119,6 +127,7 @@ then
AM_CONDITIONAL(ENABLE_TESTS, false)
AM_CONDITIONAL(ENABLE_PLUGIN, false)
AM_CONDITIONAL(ENABLE_MSGFILE, false)
AM_CONDITIONAL(ENABLE_SERIAL, false)
AM_CONDITIONAL(ENABLE_VTY, false)
AM_CONDITIONAL(ENABLE_TALLOC, false)
AM_CONDITIONAL(ENABLE_UTILITIES, false)

4
include/osmocom/core/Makefile.am
View File

@ -17,4 +17,8 @@ if ENABLE_MSGFILE
osmocore_HEADERS += msgfile.h
endif
if ENABLE_SERIAL
osmocore_HEADERS += serial.h
endif
osmocoredir = $(includedir)/osmocom/core

43
include/osmocom/core/serial.h Normal file
View File

@ -0,0 +1,43 @@
/*
* serial.h
*
* Copyright (C) 2011 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* 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.
*/
/*! \defgroup serial Utility functions to deal with serial ports
* @{
*/
/*! \file serial.h
* \file Osmocom serial port helpers
*/
#ifndef __OSMO_SERIAL_H__
#define __OSMO_SERIAL_H__
#include <termios.h>
int osmo_serial_init(const char *dev, speed_t baudrate);
int osmo_serial_set_baudrate(int fd, speed_t baudrate);
int osmo_serial_set_custom_baudrate(int fd, int baudrate);
int osmo_serial_clear_custom_baudrate(int fd);
/*! }@ */
#endif /* __OSMO_SERIAL_H__ */

4
src/Makefile.am
View File

@ -30,3 +30,7 @@ endif
if ENABLE_MSGFILE
libosmocore_la_SOURCES += msgfile.c
endif
if ENABLE_SERIAL
libosmocore_la_SOURCES += serial.c
endif

209
src/serial.c Normal file
View File

@ -0,0 +1,209 @@
/*
* serial.c
*
* Utility functions to deal with serial ports
*
* Copyright (C) 2011 Sylvain Munaut <tnt@246tNt.com>
*
* All Rights Reserved
*
* 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.
*/
/*! \addtogroup serial
* @{
*/
/*! \file serial.c
* \file Osmocom serial port helpers
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/serial.h>
#include <osmocom/core/serial.h>
#if 0
# define dbg_perror(x) perror(x)
#else
# define dbg_perror(x) do { } while (0)
#endif
/*! \brief Open serial device and does base init
* \param[in] dev Path to the device node to open
* \param[in] baudrate Baudrate constant (speed_t: B9600, B...)
* \returns >=0 file descriptor in case of success or negative errno.
*/
int
osmo_serial_init(const char *dev, speed_t baudrate)
{
int rc, fd=0, v24;
struct termios tio;
/* Open device */
fd = open(dev, O_RDWR | O_NOCTTY | O_NDELAY);
if (fd < 0) {
dbg_perror("open");
return -errno;
}
/* Configure serial interface */
rc = tcgetattr(fd, &tio);
if (rc < 0) {
dbg_perror("tcgetattr()");
rc = -errno;
goto error;
}
cfsetispeed(&tio, baudrate);
cfsetospeed(&tio, baudrate);
tio.c_cflag &= ~(PARENB | CSTOPB | CSIZE | CRTSCTS);
tio.c_cflag |= (CREAD | CLOCAL | CS8);
tio.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
tio.c_iflag |= (INPCK | ISTRIP);
tio.c_iflag &= ~(ISTRIP | IXON | IXOFF | IGNBRK | INLCR | ICRNL | IGNCR);
tio.c_oflag &= ~(OPOST | ONLCR);
rc = tcsetattr(fd, TCSANOW, &tio);
if (rc < 0) {
dbg_perror("tcsetattr()");
rc = -errno;
goto error;
}
/* Set ready to read/write */
v24 = TIOCM_DTR | TIOCM_RTS;
rc = ioctl(fd, TIOCMBIS, &v24);
if (rc < 0) {
dbg_perror("ioctl(TIOCMBIS)");
rc = -errno;
goto error;
}
return fd;
error:
if (fd)
close(fd);
return rc;
}
static int
_osmo_serial_set_baudrate(int fd, speed_t baudrate)
{
int rc;
struct termios tio;
rc = tcgetattr(fd, &tio);
if (rc < 0) {
dbg_perror("tcgetattr()");
return -errno;
}
cfsetispeed(&tio, baudrate);
cfsetospeed(&tio, baudrate);
rc = tcsetattr(fd, TCSANOW, &tio);
if (rc < 0) {
dbg_perror("tcgetattr()");
return -errno;
}
return 0;
}
/*! \brief Change current baudrate
* \param[in] fd File descriptor of the open device
* \param[in] baudrate Baudrate constant (speed_t: B9600, B...)
* \returns 0 for success or negative errno.
*/
int
osmo_serial_set_baudrate(int fd, speed_t baudrate)
{
osmo_serial_clear_custom_baudrate(fd);
return _osmo_serial_set_baudrate(fd, baudrate);
}
/*! \brief Change current baudrate to a custom one using OS specific method
* \param[in] fd File descriptor of the open device
* \param[in] baudrate Baudrate as integer
* \returns 0 for success or negative errno.
*
* This function might not work on all OS or with all type of serial adapters
*/
int
osmo_serial_set_custom_baudrate(int fd, int baudrate)
{
int rc;
struct serial_struct ser_info;
rc = ioctl(fd, TIOCGSERIAL, &ser_info);
if (rc < 0) {
dbg_perror("ioctl(TIOCGSERIAL)");
return -errno;
}
ser_info.flags = ASYNC_SPD_CUST | ASYNC_LOW_LATENCY;
ser_info.custom_divisor = ser_info.baud_base / baudrate;
rc = ioctl(fd, TIOCSSERIAL, &ser_info);
if (rc < 0) {
dbg_perror("ioctl(TIOCSSERIAL)");
return -errno;
}
return _osmo_serial_set_baudrate(fd, B38400); /* 38400 is a kind of magic ... */
}
/*! \brief Clear any custom baudrate
* \param[in] fd File descriptor of the open device
* \returns 0 for success or negative errno.
*
* This function might not work on all OS or with all type of serial adapters
*/
int
osmo_serial_clear_custom_baudrate(int fd)
{
int rc;
struct serial_struct ser_info;
rc = ioctl(fd, TIOCGSERIAL, &ser_info);
if (rc < 0) {
dbg_perror("ioctl(TIOCGSERIAL)");
return -errno;
}
ser_info.flags = ASYNC_LOW_LATENCY;
ser_info.custom_divisor = 0;
rc = ioctl(fd, TIOCSSERIAL, &ser_info);
if (rc < 0) {
dbg_perror("ioctl(TIOCSSERIAL)");
return -errno;
}
return 0;
}
/*! }@ */