前辈们NXP的sdk中关于WWDT的例程，timeout、warning、window都指...

l52571314 · 发表于 2019-12-18 08:44:17

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)
{
}
}