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/****************************************************************************
* lib/termios/lib_setspeed.c
*
* Copyright (C) 2012 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/str_tty.h>
#include <sys/ioctl.h>
#include <nuttx/serial/tioctl.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
/****************************************************************************
* Private Variables
****************************************************************************/
/****************************************************************************
* Public Variables
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: set_speed
*
* Descripton:
* set_speed(), get_speed(), and reset_speed are non-standard AIX-like
* interfaces to simplify TTY baud rate operations.
*
* The baud rate functions set_speed() and get_speed() are provided to
* allow the applications to program any value of the baud rate that is
* supported by the serial driver, but that cannot be expressed using
* the termios subroutines cfsetospeed, cfsetispeed, cfgetospeed,
* and cfsgetispeed. Those subroutines are limited to the set of values
* defined termios.h.
*
* Normal mode: This is the default mode, in which a termios supported
* speed is in use.
*
* Speed-extended mode: This mode is entered by calling set_speed() with
* a non-termios supported speed at the configuration of the line. In this
* mode, all the calls to tcgetattr subroutine or TCGETS ioctl subroutine
* will have B50 in the returned termios structure.
*
* If tcsetattr() or TCSETS, TCSETAF, or TCSETAW ioctl calls the driver
* and attempts to set B50, the actual baud rate is not changed. If it
* attempts to set any other termios-supported speed, will switch back
* to the normal mode and the requested baud rate is set. Calling
* reset_speed subroutine is another way to switch back to the
* normal mode.
*
* Input Parameters:
* fd - The 'fd' argument is an open file descriptor associated with a
* terminal.
* speed - The new, extended baud
*
* Returned Value:
* Upon successful completion, 0 is returned. Otherwise, -1 is returned and
* errno is set to indicate the error.
*
****************************************************************************/
int set_speed(int fd, int32_t speed)
{
return ioctl(fd, TIOCSETSPEED, (unsigned long)speed);
}
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