mirror of
https://gitee.com/mirrors_PX4/PX4-Autopilot.git
synced 2026-07-04 03:50:35 +08:00
patacongo
81d5f42a18
git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4967 7fd9a85b-ad96-42d3-883c-3090e2eb8679
119 lines
4.8 KiB
C
119 lines
4.8 KiB
C
/****************************************************************************
|
|
* lib/termios/lib_getspeed.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: get_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.
|
|
*
|
|
* Returned Value:
|
|
* Upon successful completion, the extended baud is returned. Otherwise,
|
|
* -1 is returned and errno is set to indicate the error.
|
|
*
|
|
****************************************************************************/
|
|
|
|
int32_t get_speed(int fd)
|
|
{
|
|
int32_t speed;
|
|
int ret;
|
|
|
|
ret = ioctl(fd, TIOCGETSPEED, (unsigned long)((uintptr_t)&speed));
|
|
if (ret < 0)
|
|
{
|
|
return (int32_t)ret;
|
|
}
|
|
|
|
return speed;
|
|
}
|