forked from Imagelibrary/rtems
104 lines
2.3 KiB
C
104 lines
2.3 KiB
C
/*
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* Copyright (c) 2011 embedded brains GmbH. All rights reserved.
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*
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* embedded brains GmbH
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* Obere Lagerstr. 30
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* 82178 Puchheim
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* Germany
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* <rtems@embedded-brains.de>
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <rtems/shell.h>
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#include <termios.h>
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#include <unistd.h>
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static rtems_status_code change_serial_settings(int fd, struct termios *term)
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{
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rtems_status_code sc = RTEMS_UNSATISFIED;
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int rv = tcgetattr(fd, term);
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if (rv == 0) {
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struct termios new_term = *term;
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new_term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON);
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new_term.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN);
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new_term.c_cflag &= ~(CSIZE | PARENB);
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new_term.c_cflag |= CS8;
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new_term.c_cc [VMIN] = 0;
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new_term.c_cc [VTIME] = 10;
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rv = tcsetattr(fd, TCSANOW, &new_term);
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if (rv == 0) {
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sc = RTEMS_SUCCESSFUL;
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}
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}
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return sc;
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}
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static rtems_status_code restore_serial_settings(int fd, struct termios *term)
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{
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int rv = tcsetattr(fd, TCSANOW, term);
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return rv == 0 ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED;
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}
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rtems_status_code rtems_shell_wait_for_explicit_input(
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int fd,
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int timeout_in_seconds,
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rtems_shell_wait_for_input_notification notification,
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void *notification_arg,
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int desired_input
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)
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{
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struct termios term;
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rtems_status_code sc = change_serial_settings(fd, &term);
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if (sc == RTEMS_SUCCESSFUL) {
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bool input_detected = false;
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int i = 0;
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for (i = 0; i < timeout_in_seconds && !input_detected; ++i) {
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unsigned char c;
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(*notification)(fd, timeout_in_seconds - i, notification_arg);
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input_detected = read(fd, &c, sizeof(c)) > 0
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&& (desired_input == -1 || desired_input == c);
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}
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sc = restore_serial_settings(fd, &term);
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if (sc == RTEMS_SUCCESSFUL) {
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sc = input_detected ? RTEMS_SUCCESSFUL : RTEMS_TIMEOUT;
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}
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}
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return sc;
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}
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rtems_status_code rtems_shell_wait_for_input(
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int fd,
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int timeout_in_seconds,
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rtems_shell_wait_for_input_notification notification,
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void *notification_arg
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)
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{
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return rtems_shell_wait_for_explicit_input(
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fd,
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timeout_in_seconds,
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notification,
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notification_arg,
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-1
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);
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}
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