STM32之PVD电压检测

 EXAMPLE_PWR.rar   

如果VDD或者VDDA电压高于或低于PVD设定阈值都产生中断，表现为每中断一次，LED1就亮变灭或者灭变亮。

/********************************************************************************
  * @file    PWR/PVD/main.c
  * @author  MCD Application Team
  * @version V3.4.0
  * @date    10/15/2010
  * @brief   Main program body.
  ******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include "stm32_eval.h"

void EXTI_Configuration(void);
void NVIC_Configuration(void);

/**
  * @brief   Main program.
  * @param  None
  * @retval None
  */
int main(void)
{
  /*!< At this stage the microcontroller clock setting is already configured,
       this is done through SystemInit() function which is called from startup
       file (startup_stm32f10x_xx.s) before to branch to application main.
       To reconfigure the default setting of SystemInit() function, refer to
       system_stm32f10x.c file
     */
  /* Initialize LEDs and Key Button mounted on STM3210X-EVAL board */
  STM_EVAL_LEDInit(LED1);

  GPIO_SetBits(GPIOC, GPIO_Pin_7);

  /* Enable PWR and BKP clock */
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);//电源管理部分时钟开启

  /* Configure EXTI Line to generate an interrupt on falling edge */
  EXTI_Configuration();

  /* NVIC configuration */
  NVIC_Configuration();

  /* Configure the PVD Level to 2.9V */
  PWR_PVDLevelConfig(PWR_PVDLevel_2V9);// 设定监控阀值

  /* Enable the PVD Output */
  PWR_PVDCmd(ENABLE);// 使能PVD

  while (1)
  {
  }
}

/**
  * @brief  Configures EXTI Lines.
  * @param  None
  * @retval None
  */
void EXTI_Configuration(void)
{
  EXTI_InitTypeDef EXTI_InitStructure;

  /* Configure EXTI Line16(PVD Output) to generate an interrupt on rising and
     falling edges */
  EXTI_ClearITPendingBit(EXTI_Line16);
  EXTI_InitStructure.EXTI_Line = EXTI_Line16;// PVD连接到中断线16上
  EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//使用中断模式
  EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;//电压上升或下降越过设定阀值时都产生中断。
  EXTI_InitStructure.EXTI_LineCmd = ENABLE;// 使能中断线
  EXTI_Init(&EXTI_InitStructure);// 初始
}

/**
  * @brief  Configures NVIC and Vector Table base location.
  * @param  None
  * @retval None
  */
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;

  /* Configure one bit for preemption priority */
  NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);//中断优先级配置

  /* Enable the PVD Interrupt */ //设置PVD中断
  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);
}
/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/

注意：GPIO驱动LED模式为GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;还是推挽输出。

中断处理函数：

点击(此处)折叠或打开

void PVD_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line16) != RESET)
{
/* LED1翻转 */
STM_EVAL_LEDToggle(LED1);

/* Clear the Key Button EXTI line pending bit */
EXTI_ClearITPendingBit(EXTI_Line16);
}
}