STM32 PVD断电检测

lifeHORSE · 发表于 2017-9-30 13:32:54

void PVD_Config(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
EXTI_InitTypeDef EXTI_InitStructure;
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
   /* Enable the PVD Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = PVD_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
   /* Configure EXTI Line16(PVD Output) to generate an interrupt on rising  edges */
EXTI_ClearITPendingBit(EXTI_Line16);
EXTI_InitStructure.EXTI_Line = EXTI_Line16;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger =EXTI_Trigger_Rising; //电压从高电压下降到低于电压的阀值产生中断
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
   PWR_PVDLevelConfig(PWR_PVDLevel_2V9);
   PWR_PVDCmd(ENABLE);
}

void PVD_IRQHandler(void)
{
   u16 ledflag[2]={7,6};
   if(PWR_GetFlagStatus(PWR_FLAG_PVDO))
   {
      EXTI_ClearITPendingBit(EXTI_Line16);
   STMFLASH_Write(writeAddr,ledflag,2);
   }
}

u16 led[2]={0};
int main(void)
{
u8 i=0;
RCC_Configuration();
   delay_init();
   LED_Init();
   PVD_Config();

   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);

   STMFLASH_Read(writeAddr,led,2);
   while(1)
{
   if(led[0]==7)
   {
   GPIO_ResetBits(GPIOE,GPIO_Pin_5);
   delay_ms(1000);
   GPIO_SetBits(GPIOE,GPIO_Pin_5);
   delay_ms(1000);
   }
   if(led[1]==8)
   {
                              GPIO_ResetBits(GPIOB,GPIO_Pin_5);
   delay_ms(1000);
   GPIO_SetBits(GPIOB,GPIO_Pin_5);
   delay_ms(1000);
   }
   }
}
断电时，把局部数组的值写入Flash，  然后上电读出数据，判断数据点亮LED。  现在是第一次断电，上电后LED正常工作；第二次断电，上电后LED不工作；第三次断电，上电后工作LED；第四次断电，上电后不工作。求大神指导