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本帖最后由 l52571314 于 2019-12-18 08:53 编辑
- /*
- * The Clear BSD License
- * Copyright (c) 2016, Freescale Semiconductor, Inc.
- * Copyright 2016-2017 NXP
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modification,
- * are permitted (subject to the limitations in the disclaimer below) provided
- * that the following conditions are met:
- *
- * o Redistributions of source code must retain the above copyright notice, this list
- * of conditions and the following disclaimer.
- *
- * o 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.
- *
- * o 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.
- *
- * NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE GRANTED BY THIS LICENSE.
- * 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.
- */
- /*******************************************************************************
- * Includes
- ******************************************************************************/
- #include "fsl_debug_console.h"
- #include "board.h"
- #include "fsl_wwdt.h"
- #include "fsl_power.h"
- #include "pin_mux.h"
- #include <stdbool.h>
- /*******************************************************************************
- * Definitions
- ******************************************************************************/
- #define APP_LED_INIT (LED3_INIT(1));
- #define APP_LED_ON (LED3_ON());
- #define APP_LED_TOGGLE (LED3_TOGGLE());
- #define APP_WDT_IRQn WDT_BOD_IRQn
- #define APP_WDT_IRQ_HANDLER WDT_BOD_IRQHandler
- #define WDT_CLK_FREQ CLOCK_GetFreq(kCLOCK_WdtOsc)
- /*******************************************************************************
- * Prototypes
- ******************************************************************************/
- /*******************************************************************************
- * Variables
- ******************************************************************************/
- static volatile uint8_t wdt_update_count;
- /*******************************************************************************
- * Code
- ******************************************************************************/
- void APP_WDT_IRQ_HANDLER(void)
- {
- uint32_t wdtStatus = WWDT_GetStatusFlags(WWDT);
- APP_LED_TOGGLE;
- /* The chip will reset before this happens */
- if (wdtStatus & kWWDT_TimeoutFlag)
- {
- /* A watchdog feed didn't occur prior to window timeout */
- /* Stop WDT */
- WWDT_Disable(WWDT);
- WWDT_ClearStatusFlags(WWDT, kWWDT_TimeoutFlag);
- /* Needs restart */
- WWDT_Enable(WWDT);
- }
- /* Handle warning interrupt */
- if (wdtStatus & kWWDT_WarningFlag)
- {
- if (wdt_update_count < 5)
- {
- while (WWDT->TV >= WWDT->WARNINT)
- {
- }
- /* Feed only for the first 5 warnings then allow for a WDT reset to occur */
- WWDT_Refresh(WWDT);
- wdt_update_count++;
- }
- while (WWDT->TV < WWDT->WARNINT)
- {
- }
- /* A watchdog feed didn't occur prior to warning timeout */
- WWDT_ClearStatusFlags(WWDT, kWWDT_WarningFlag);
- }
- /* Add for ARM errata 838869, affects Cortex-M4, Cortex-M4F Store immediate overlapping
- exception return operation might vector to incorrect interrupt */
- #if defined __CORTEX_M && (__CORTEX_M == 4U)
- __DSB();
- #endif
- }
- /*!
- * @brief Main function
- */
- int main(void)
- {
- wwdt_config_t config;
- uint32_t wdtFreq;
- /* Init hardware*/
- CLOCK_EnableClock(kCLOCK_Gpio0);
- CLOCK_EnableClock(kCLOCK_Gpio2);
- /* attach 12 MHz clock to FLEXCOMM0 (debug console) */
- CLOCK_AttachClk(BOARD_DEBUG_UART_CLK_ATTACH);
- BOARD_InitPins();
- BOARD_BootClockFROHF48M();
- BOARD_InitDebugConsole();
- /* Set Red LED to initially be high */
- APP_LED_INIT;
- #if !defined (FSL_FEATURE_WWDT_HAS_NO_PDCFG) || (!FSL_FEATURE_WWDT_HAS_NO_PDCFG)
- POWER_DisablePD(kPDRUNCFG_PD_WDT_OSC);
- #endif
- /* The WDT divides the input frequency into it by 4 */
- wdtFreq = WDT_CLK_FREQ / 4;
- NVIC_EnableIRQ(APP_WDT_IRQn);
- WWDT_GetDefaultConfig(&config);
- /* Check if reset is due to Watchdog */
- if (WWDT_GetStatusFlags(WWDT) & kWWDT_TimeoutFlag)
- {
- APP_LED_ON;
- PRINTF("Watchdog reset occurred\r\n");
- }
- /*
- * Set watchdog feed time constant to approximately 2s
- * Set watchdog warning time to 512 ticks after feed time constant
- * Set watchdog window time to 1s
- */
- config.timeoutValue = wdtFreq * 2;
- config.warningValue = 512;
- config.windowValue = wdtFreq * 1;
- /* Configure WWDT to reset on timeout */
- config.enableWatchdogReset = true;
- /* wdog refresh test in window mode */
- PRINTF("\r\n--- Window mode refresh test start---\r\n");
- WWDT_Init(WWDT, &config);
- while (1)
- {
- }
- }
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