watchdog-arch.c

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/*
 * Copyright (C) 2020 Yago Fontoura do Rosario <yago.rosario@hotmail.com.br>
 * All rights reserved.
 *
 * 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 of the copyright holder 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 HOLDER 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.
 */
/*---------------------------------------------------------------------------*/
/**
 * \addtogroup nrf
 * @{
 *
 * \addtogroup nrf-dev Device drivers
 * @{
 *
 * \addtogroup nrf-watchdog Watchdog driver
 * @{
 *
 * \file
 *         Watchdog implementation for the nRF.
 * \author
 *         Yago Fontoura do Rosario <yago.rosario@hotmail.com.br>
 *
 */
/*---------------------------------------------------------------------------*/
#include "contiki.h"
 
#include "nrfx_config.h"
#include "nrfx_wdt.h"
 
#ifdef WATCHDOG_CONF_ENABLE
#define WATCHDOG_ENABLE WATCHDOG_CONF_ENABLE
#else
/* Enabled by default */
#define WATCHDOG_ENABLE 1
#endif
 
/*---------------------------------------------------------------------------*/
static const nrfx_wdt_t wdt = NRFX_WDT_INSTANCE(0);
static nrfx_wdt_channel_id wdt_channel_id;
static uint8_t wdt_initialized = 0;
/*---------------------------------------------------------------------------*/
/**
 * @brief WDT events handler.
 */
#if NRFX_API_VER_AT_LEAST(3, 2, 0)
static void
wdt_event_handler(nrf_wdt_event_t event_type, uint32_t requests, void *p_context)
{
  (void)event_type;
  (void)requests;
  (void)p_context;
}
#else
static void
wdt_event_handler(void)
{
  /* Event handler for v2.x API */
}
#endif
/*---------------------------------------------------------------------------*/
void
watchdog_init(void)
{
#if !WATCHDOG_ENABLE
  return;
#endif /* WATCHDOG_ENABLE */
 
  nrfx_wdt_config_t config = NRFX_WDT_DEFAULT_CONFIG;
 
#if NRFX_API_VER_AT_LEAST(3, 2, 0)
  nrfx_err_t err_code = nrfx_wdt_init(&wdt, &config, &wdt_event_handler, NULL);
#else
  nrfx_err_t err_code = nrfx_wdt_init(&wdt, &config, &wdt_event_handler);
#endif
 
  if(err_code != NRFX_SUCCESS) {
    return;
  }
 
  err_code = nrfx_wdt_channel_alloc(&wdt, &wdt_channel_id);
 
  if(err_code != NRFX_SUCCESS) {
    return;
  }
 
  wdt_initialized = 1;
}
/*---------------------------------------------------------------------------*/
void
watchdog_start(void)
{
  if(wdt_initialized) {
    nrfx_wdt_enable(&wdt);
  }
}
/*---------------------------------------------------------------------------*/
void
watchdog_periodic(void)
{
  if(wdt_initialized) {
    nrfx_wdt_channel_feed(&wdt, wdt_channel_id);
  }
}
/*---------------------------------------------------------------------------*/
void
watchdog_reboot(void)
{
  NVIC_SystemReset();
}
/**
 * @}
 * @}
 * @}
 */