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/*
    ChibiOS - Copyright (C) 2006..2016 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

#include "ch.h"
#include "hal.h"

/*
 * Watchdog deadline set to more than one second (LSI=40000 / (64 * 1000)).
 */
static const WDGConfig wdgcfg = {
  STM32_IWDG_PR_64,
  STM32_IWDG_RL(1000),
  STM32_IWDG_WIN_DISABLED
};

/*
 * Application entry point.
 */
int main(void) {

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * Starting the watchdog driver.
   */
  wdgStart(&WDGD1, &wdgcfg);

  /*
   * Normal main() thread activity, it resets the watchdog.
   */
  while (true) {
    wdgReset(&WDGD1);
    palToggleLine(LINE_LED4);
    chThdSleepMilliseconds(500);
  }
  return 0;
}
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/*
    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010,
                 2011 Giovanni Di Sirio.

    This file is part of ChibiOS/RT.

    ChibiOS/RT is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.

    ChibiOS/RT is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/**
 * @file    chbsem.h
 * @brief   Binary semaphores structures and macros.
 *
 * @addtogroup binary_semaphores
 * @details Binary semaphores related APIs and services.
 *
 *          <h2>Operation mode</h2>
 *          Binary semaphores are implemented as a set of macros that use the
 *          existing counting semaphores primitives. The difference between
 *          counting and binary semaphores is that the counter of binary
 *          semaphores is not allowed to grow above the value 1. Repeated
 *          signal operation are ignored. A binary semaphore can thus have
 *          only two defined states:
 *          - <b>Taken</b>, when its counter has a value of zero or lower
 *            than zero. A negative number represent the number of threads
 *            queued on the binary semaphore.
 *          - <b>Not taken</b>, when its counter has a value of one.
 *          .
 *          Binary semaphores are different from mutexes because there is no
 *          the concept of ownership, a binary semaphore can be taken by a
 *          thread and signaled by another thread or an interrupt handler,
 *          mutexes can only be taken and released by the same thread. Another
 *          difference is that binary semaphores, unlike mutexes, do not
 *          implement the priority inheritance protocol.<br>
 *          In order to use the binary semaphores APIs the @p CH_USE_SEMAPHORES
 *          option must be enabled in @p chconf.h.
 * @{
 */

#ifndef _CHBSEM_H_
#define _CHBSEM_H_

#if CH_USE_SEMAPHORES || defined(__DOXYGEN__)

/**
 * @extends Semaphore
 *
 * @brief   Binary semaphore type.
 */
typedef struct  {
  Semaphore             bs_sem;
} BinarySemaphore;

/**
 * @brief   Data part of a static semaphore initializer.
 * @details This macro should be used when statically initializing a semaphore
 *          that is part of a bigger structure.
 *
 * @param[in] name      the name of the semaphore variable
 * @param[in] taken     the semaphore initial state
 */
#define _BSEMAPHORE_DATA(name, taken)                                       \
  {_SEMAPHORE_DATA(name.bs_sem, ((taken) ? 0 : 1))}

/**
 * @brief   Static semaphore initializer.
 * @details Statically initialized semaphores require no explicit
 *          initialization using @p chSemInit().
 *
 * @param[in] name      the name of the semaphore variable
 * @param[in] taken     the semaphore initial state
 */
#define BSEMAPHORE_DECL(name, taken)                                        \
  BinarySemaphore name = _BSEMAPHORE_DATA(name, taken)

/**
 * @brief   Initializes a binary semaphore.
 *
 * @param[out] bsp      pointer to a @p BinarySemaphore structure
 * @param[in] taken     initial state of the binary semaphore:
 *                      - @a FALSE, the initial state is not taken.
 *                      - @a TRUE, the initial state is taken.
 *                      .
 *
 * @init
 */
#define chBSemInit(bsp, taken) chSemInit(&(bsp)->bs_sem, (taken) ? 0 : 1)

/**
 * @brief   Wait operation on the binary semaphore.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 * @return              A message specifying how the invoking thread has been
 *                      released from the semaphore.
 * @retval RDY_OK       if the binary semaphore has been successfully taken.
 * @retval RDY_RESET    if the binary semaphore has been reset using
 *                      @p bsemReset().
 *
 * @api
 */
#define chBSemWait(bsp) chSemWait(&(bsp)->bs_sem)

/**
 * @brief   Wait operation on the binary semaphore.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 * @return              A message specifying how the invoking thread has been
 *                      released from the semaphore.
 * @retval RDY_OK       if the binary semaphore has been successfully taken.
 * @retval RDY_RESET    if the binary semaphore has been reset using
 *                      @p bsemReset().
 *
 * @sclass
 */
#define chBSemWaitS(bsp) chSemWaitS(&(bsp)->bs_sem)

/**
 * @brief   Wait operation on the binary semaphore.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 * @param[in] time      the number of ticks before the operation timeouts,
 *                      the following special values are allowed:
 *                      - @a TIME_IMMEDIATE immediate timeout.
 *                      - @a TIME_INFINITE no timeout.
 *                      .
 * @return              A message specifying how the invoking thread has been
 *                      released from the semaphore.
 * @retval RDY_OK       if the binary semaphore has been successfully taken.
 * @retval RDY_RESET    if the binary semaphore has been reset using
 *                      @p bsemReset().
 * @retval RDY_TIMEOUT  if the binary semaphore has not been signaled or reset
 *                      within the specified timeout.
 *
 * @api
 */
#define chBSemWaitTimeout(bsp, time) chSemWaitTimeout(&(bsp)->bs_sem, (time))

/**
 * @brief   Wait operation on the binary semaphore.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 * @param[in] time      the number of ticks before the operation timeouts,
 *                      the following special values are allowed:
 *                      - @a TIME_IMMEDIATE immediate timeout.
 *                      - @a TIME_INFINITE no timeout.
 *                      .
 * @return              A message specifying how the invoking thread has been
 *                      released from the semaphore.
 * @retval RDY_OK       if the binary semaphore has been successfully taken.
 * @retval RDY_RESET    if the binary semaphore has been reset using
 *                      @p bsemReset().
 * @retval RDY_TIMEOUT  if the binary semaphore has not been signaled or reset
 *                      within the specified timeout.
 *
 * @sclass
 */
#define chBSemWaitTimeoutS(bsp, time) chSemWaitTimeoutS(&(bsp)->bs_sem, (time))

/**
 * @brief   Reset operation on the binary semaphore.
 * @note    The released threads can recognize they were waked up by a reset
 *          rather than a signal because the @p bsemWait() will return
 *          @p RDY_RESET instead of @p RDY_OK.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 * @param[in] taken     new state of the binary semaphore
 *                      - @a FALSE, the new state is not taken.
 *                      - @a TRUE, the new state is taken.
 *                      .
 *
 * @api
 */
#define chBSemReset(bsp, taken) chSemReset(&(bsp)->bs_sem, (taken) ? 0 : 1)

/**
 * @brief   Reset operation on the binary semaphore.
 * @note    The released threads can recognize they were waked up by a reset
 *          rather than a signal because the @p bsemWait() will return
 *          @p RDY_RESET instead of @p RDY_OK.
 * @note    This function does not reschedule.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 * @param[in] taken     new state of the binary semaphore
 *                      - @a FALSE, the new state is not taken.
 *                      - @a TRUE, the new state is taken.
 *                      .
 *
 * @iclass
 */
#define chBSemResetI(bsp, taken) chSemResetI(&(bsp)->bs_sem, (taken) ? 0 : 1)

/**
 * @brief   Performs a signal operation on a binary semaphore.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 *
 * @api
 */
#define chBSemSignal(bsp) {                                                 \
  chSysLock();                                                              \
  chBSemSignalI((bsp));                                                     \
  chSchRescheduleS();                                                       \
  chSysUnlock();                                                            \
}

/**
 * @brief   Performs a signal operation on a binary semaphore.
 * @note    This function does not reschedule.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 *
 * @iclass
 */
#define chBSemSignalI(bsp) {                                                \
  if ((bsp)->bs_sem.s_cnt < 1)                                              \
    chSemSignalI(&(bsp)->bs_sem);                                           \
}

/**
 * @brief   Returns the binary semaphore current state.
 *
 * @param[in] bsp       pointer to a @p BinarySemaphore structure
 * @return              The binary semaphore current state.
 * @retval FALSE        if the binary semaphore is not taken.
 * @retval TRUE         if the binary semaphore is taken.
 *
 * @iclass
 */
#define chBSemGetStateI(bsp) ((bsp)->bs_sem.s_cnt > 0 ? FALSE : TRUE)

#endif /* CH_USE_SEMAPHORES */

#endif /* _CHBSEM_H_ */

/** @} */