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Added support for non-standard baud rates

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Only enabled when possible, that is, when the BOTHER definition is
available.

It is untested but it should work as described here:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683826

Some Cypress USB<->serial devices supposedly supports arbitrary speeds.
This commit is contained in:
Martin Lund 2016-05-28 16:02:21 +02:00
parent 2c53bfde96
commit deec83a4ee
2 changed files with 28 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

3
configure.ac
View file

@ -87,6 +87,9 @@ TIO_CHECK_BAUDRATES(
AC_DEFINE_UNQUOTED([AUTOCONF_BAUDRATE_CASES],[$BAUDRATE_CASES],[Switch cases for detected baud rates])
# Check that it is possible to set arbitrary baud rates using BOTHER
AC_CHECK_DECLS([BOTHER], [], [], [[#include <asm/termios.h>]])
AC_CONFIG_FILES([Makefile])
AC_CONFIG_FILES([src/Makefile])
AC_CONFIG_FILES([src/bash-completion/tio])

28
src/tty.c
View file

@ -45,8 +45,13 @@ static struct termios tio, new_stdout, old_stdout, old_tio;
static unsigned long rx_total = 0, tx_total = 0;
static bool connected = false;
static bool tainted = false;
static bool standard_baudrate = true;
static int fd;
#ifndef BOTHER
#define BOTHER 0010000
#endif
#define tio_printf(format, args...) \
{ \
if (tainted) putchar('\n'); \
@ -156,7 +161,7 @@ void stdout_restore(void)
void tty_configure(void)
{
speed_t baudrate;
speed_t baudrate = 0;
memset(&tio, 0, sizeof(tio));
@ -177,12 +182,25 @@ void tty_configure(void)
AUTOCONF_BAUDRATE_CASES
default:
#if !HAVE_DECL_BOTHER
error_printf("Invalid baud rate");
exit(EXIT_FAILURE);
#else
standard_baudrate = false;
break;
#endif
}
cfsetispeed(&tio, baudrate);
cfsetospeed(&tio, baudrate);
if (standard_baudrate)
{
cfsetispeed(&tio, baudrate);
cfsetospeed(&tio, baudrate);
} else
{
tio.c_ispeed = tio.c_ospeed = baudrate;
tio.c_cflag &= ~CBAUD;
tio.c_cflag |= BOTHER;
}
/* Set databits */
tio.c_cflag &= ~CSIZE;
@ -374,6 +392,10 @@ int tty_connect(void)
/* Flush stale I/O data (if any) */
tcflush(fd, TCIOFLUSH);
/* Warn if non standard baud rate is used */
if (!standard_baudrate)
tio_printf("Warning: Using a non standard baud rate");
/* Print connect status */
tio_printf("Connected");
connected = true;