117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/********************************** (C) COPYRIGHT *******************************
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* File Name : main.c
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* Author : WCH
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* Version : V1.0.0
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* Date : 2021/06/06
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* Description : Main program body.
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*********************************************************************************
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* Copyright (c) 2021 Nanjing Qinheng Microelectronics Co., Ltd.
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* Attention: This software (modified or not) and binary are used for
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* microcontroller manufactured by Nanjing Qinheng Microelectronics.
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*******************************************************************************/
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/*
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*@Note
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*Window watchdog routine:
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*This routine demonstrates that the watchdog is fed between the window 0x40 - 0x5f to
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*prevent the watchdog from being reset.
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*
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*/
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#include "debug.h"
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/* Global define */
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#define WWDG_CNT 0X7F
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/* Global Variable */
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/*********************************************************************
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* @fn WWDG_NVIC_Config
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*
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* @brief WWDG INT init.
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*
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* @return none
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*/
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static void WWDG_NVIC_Config(void)
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{
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NVIC_InitTypeDef NVIC_InitStructure = {0};
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NVIC_InitStructure.NVIC_IRQChannel = WWDG_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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}
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/*********************************************************************
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* @fn WWDG_Config
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*
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* @brief Configure WWDG.
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*
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* @param tr - The value of the decrement counter(0x7f~0x40)
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* wr - Window value(0x7f~0x40)
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* prv - Prescaler value
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* WWDG_Prescaler_1
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* WWDG_Prescaler_2
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* WWDG_Prescaler_4
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* WWDG_Prescaler_8
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*
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* @return none
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*/
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void WWDG_Config(uint8_t tr, uint8_t wr, uint32_t prv)
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{
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_WWDG, ENABLE);
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WWDG_SetCounter(tr);
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WWDG_SetPrescaler(prv);
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WWDG_SetWindowValue(wr);
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WWDG_Enable(WWDG_CNT);
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WWDG_ClearFlag();
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WWDG_NVIC_Config();
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WWDG_EnableIT();
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}
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/*********************************************************************
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* @fn WWDG_Feed
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*
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* @brief Feed WWDG.
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*
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* @return none
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*/
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void WWDG_Feed(void)
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{
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WWDG_SetCounter(WWDG_CNT);
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}
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/*********************************************************************
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* @fn main
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*
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* @brief Main program.
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*
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* @return none
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*/
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int main(void)
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{
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u8 wwdg_tr, wwdg_wr;
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
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SystemCoreClockUpdate();
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Delay_Init();
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USART_Printf_Init(115200);
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printf("SystemClk:%d\r\n", SystemCoreClock);
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printf( "ChipID:%08x\r\n", DBGMCU_GetCHIPID() );
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printf("WWDG Test\r\n");
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WWDG_Config(0x7f, 0x5f, WWDG_Prescaler_8); /* 48M/8/4096 */
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wwdg_wr = WWDG->CFGR & 0x7F;
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while(1)
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{
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Delay_Ms(10);
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printf("**********\r\n");
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wwdg_tr = WWDG->CTLR & 0x7F;
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if(wwdg_tr < wwdg_wr)
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{
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WWDG_Feed();
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}
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printf("##########\r\n");
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}
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}
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