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termios: Add rtems_termios_set_best_baud()

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This commit is contained in:
Sebastian Huber
2014-07-09 15:44:13 +02:00
parent 8074342c9b
commit 93726e5205
5 changed files with 122 additions and 5 deletions
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2
cpukit/libcsupport/Makefile.am
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@@ -65,7 +65,7 @@ TERMIOS_C_FILES = src/cfgetispeed.c src/cfgetospeed.c src/cfsetispeed.c \
src/tcsetpgrp.c src/termios.c src/termiosinitialize.c \
src/termios_baud2index.c src/termios_baud2num.c src/termios_num2baud.c \
src/termios_setinitialbaud.c src/termios_baudtable.c src/cfsetspeed.c \
src/cfmakeraw.c
src/cfmakeraw.c src/termios_setbestbaud.c
SYSTEM_CALL_C_FILES = src/open.c src/close.c src/read.c src/write.c \
src/write_r.c \

21
cpukit/libcsupport/include/rtems/termiostypes.h
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@@ -78,7 +78,8 @@ typedef struct {
* @retval true Successful operation.
* @retval false Cannot open device.
*
* @see rtems_termios_get_device_context() and rtems_termios_get_termios().
* @see rtems_termios_get_device_context(), rtems_termios_set_best_baud() and
* rtems_termios_get_termios().
*/
bool (*first_open)(
struct rtems_termios_tty *tty,
@@ -291,7 +292,7 @@ typedef struct rtems_termios_tty {
} rtems_termios_tty;
/**
* @brief Installes a Termios device.
* @brief Installs a Termios device.
*
* @param[in] device_file If not @c NULL, then a device file for the specified
* major and minor number will be created.
@@ -379,12 +380,26 @@ RTEMS_INLINE_ROUTINE void *rtems_termios_get_device_context(
* initial attributes.
*/
RTEMS_INLINE_ROUTINE struct termios *rtems_termios_get_termios(
const rtems_termios_tty *tty
rtems_termios_tty *tty
)
{
return &tty->termios;
}
/**
* @brief Sets the best baud value in the Termios control.
*
* The valid Termios baud values are between 0 and 460800. The Termios baud
* value is chosen which minimizes the difference to the value specified.
*
* @param[in] tty The Termios control.
* @param[in] baud The current baud setting of the device.
*/
void rtems_termios_set_best_baud(
rtems_termios_tty *tty,
uint32_t baud
);
struct rtems_termios_linesw {
int (*l_open) (struct rtems_termios_tty *tp);
int (*l_close)(struct rtems_termios_tty *tp);

45
cpukit/libcsupport/src/termios_setbestbaud.c Normal file
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@@ -0,0 +1,45 @@
/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/termiostypes.h>
void rtems_termios_set_best_baud(
rtems_termios_tty *tty,
uint32_t baud
)
{
const rtems_assoc_t *current = &rtems_termios_baud_table[ 0 ];
const rtems_assoc_t *last = current;
tcflag_t cbaud_mask = CBAUD;
tcflag_t cbaud;
while ( current->name != NULL && current->local_value < baud ) {
last = current;
++current;
}
if ( current->name != NULL ) {
uint32_t mid = (last->local_value + current->local_value) / UINT32_C( 2 );
cbaud = baud <= mid ? last->remote_value : current->remote_value;
} else {
cbaud = B460800;
}
tty->termios.c_cflag = (tty->termios.c_cflag & ~cbaud_mask) | cbaud;
}