shoes/liangjianbo/nRF5_SDK_17.0.0_9d13099/examples/peripheral/wdt/main.c

/**
 * Copyright (c) 2014 - 2020, Nordic Semiconductor ASA
 *
 * All rights reserved.
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 * 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, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, 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 Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
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 * 5. Any software provided in binary form under this license must not be reverse
 *    engineered, decompiled, modified and/or disassembled.
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 * THIS SOFTWARE IS PROVIDED BY NORDIC SEMICONDUCTOR ASA "AS IS" AND ANY EXPRESS
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/** @file
 * @defgroup nrf_dev_wdt_example_main main.c
 * @{
 * @ingroup nrf_dev_wdt_example
 * @brief WDT Example Application main file.
 *
 * This file contains the source code for a sample application using WDT.
 *
 */

#include <stdbool.h>
#include <stdint.h>

#include "nrf.h"
#include "bsp.h"
#include "app_timer.h"
#include "app_error.h"
#include "nrf_drv_wdt.h"
#include "nrf_drv_clock.h"
#include "nrf_delay.h"
#include "app_util_platform.h"

#define FEED_BUTTON_ID          0                           /**< Button for feeding the dog. */

nrf_drv_wdt_channel_id m_channel_id;

/**
 * @brief WDT events handler.
 */
void wdt_event_handler(void)
{
    bsp_board_leds_off();

    //NOTE: The max amount of time we can spend in WDT interrupt is two cycles of 32768[Hz] clock - after that, reset occurs
}

/**
 * @brief Assert callback.
 *
 * @param[in] id    Fault identifier. See @ref NRF_FAULT_IDS.
 * @param[in] pc    The program counter of the instruction that triggered the fault, or 0 if
 *                  unavailable.
 * @param[in] info  Optional additional information regarding the fault. Refer to each fault
 *                  identifier for details.
 */
void app_error_fault_handler(uint32_t id, uint32_t pc, uint32_t info)
{
    bsp_board_leds_off();
    while (1);
}

/**
 * @brief BSP events callback.
 */
void bsp_event_callback(bsp_event_t event)
{
    switch (event)
    {
        case BSP_EVENT_KEY_0:
            nrf_drv_wdt_channel_feed(m_channel_id);
            break;

        default :
            //Do nothing.
            break;
    }
}

/**
 * @brief Function for main application entry.
 */
int main(void)
{
    uint32_t err_code = NRF_SUCCESS;

    //BSP configuration for button support: button pushing will feed the dog.
    err_code = nrf_drv_clock_init();
    APP_ERROR_CHECK(err_code);
    nrf_drv_clock_lfclk_request(NULL);

    err_code = app_timer_init();
    APP_ERROR_CHECK(err_code);

    err_code = bsp_init(BSP_INIT_BUTTONS, bsp_event_callback);
    APP_ERROR_CHECK(err_code);

    //Configure all LEDs on board.
    bsp_board_init(BSP_INIT_LEDS);

    //Configure WDT.
    nrf_drv_wdt_config_t config = NRF_DRV_WDT_DEAFULT_CONFIG;
    err_code = nrf_drv_wdt_init(&config, wdt_event_handler);
    APP_ERROR_CHECK(err_code);
    err_code = nrf_drv_wdt_channel_alloc(&m_channel_id);
    APP_ERROR_CHECK(err_code);
    nrf_drv_wdt_enable();

    //Indicate program start on LEDs.
    for (uint32_t i = 0; i < LEDS_NUMBER; i++)
    {   nrf_delay_ms(200);
        bsp_board_led_on(i);
    }
     err_code = bsp_buttons_enable();
     APP_ERROR_CHECK(err_code);

    while (1)
    {
        __SEV();
        __WFE();
        __WFE();
    }
}

/** @} */