分享掉电保存值flash

只看该作者 · 2016-11-23 10:31

void PVD_Init(void)
{
NVIC_InitTypeDef NVIC_InitStruct;
EXTI_InitTypeDef EXTI_InitStructure;

      RCC_APB1PeriphClockCmd( RCC_APB1Periph_PWR, ENABLE);
      PWR_PVDLevelConfig(PWR_PVDLevel_2V9);

      NVIC_InitStruct.NVIC_IRQChannel = PVD_IRQn;
      NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
      NVIC_InitStruct.NVIC_IRQChannelSubPriority = 1;
      NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;

      NVIC_Init(&NVIC_InitStruct);//允许中断

      EXTI_ClearITPendingBit(EXTI_Line16);
      EXTI_InitStructure.EXTI_Line = EXTI_Line16;
      EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
      EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
      EXTI_InitStructure.EXTI_LineCmd = ENABLE;
      EXTI_Init(&EXTI_InitStructure);

      PWR_PVDCmd(ENABLE);
}

初始化
注意门限电压根据实际设置
中断优先级要高

只看该作者 · 2016-11-23 10:34

void PVD_IRQHandler(void)
{

EXTI_ClearITPendingBit(EXTI_Line16);
if(PWR_GetFlagStatus(PWR_FLAG_PVDO)) //
{
PWR_ClearFlag(PWR_FLAG_PVDO);

LosePowerSeve();
}
}

void LosePowerSeve()
{
FLASH_Unlock();
FLASH_ProgramHalfWord(0x5f800,ErrorThingNumber);//
FLASH_ProgramHalfWord(0x5f802,FlashErrorNowP);//
FLASH_Lock();//上锁
}

void SysSet_init()
{
FLASH_Unlock();
FLASH_ErasePage(0x5f800 );//擦除这个扇区
FLASH_Lock();//上锁
}

需要掉电保存的数据单独放在一个扇区，在程序开始时清flash