STM32之PVD电压检测

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。

1. /********************************************************************************

2.   * @file PWR/PVD/main.c
   

3.   * @author MCD Application Team
   

4.   * @version V3.4.0
   

5.   * @date 10/15/2010
   

6.   * @brief Main program body.
   

7.   ******************************************************************************/

8. /* Includes ------------------------------------------------------------------*/

9. #include 'stm32f10x.h'
   

10. #include 'stm32_eval.h'
    

11. 
    

12. void EXTI_Configuration(void);
    

13. void NVIC_Configuration(void);
    

14. 
    

15. /**
    

16.   * @brief Main program.
    

17.   * @param None
    

18.   * @retval None
    

19.   */
    

20. int main(void)
    

21. {
    

22.   /*!< At this stage the microcontroller clock setting is already configured,
    

23.        this is done through SystemInit() function which is called from startup
    

24.        file (startup_stm32f10x_xx.s) before to branch to application main.
    

25.        To reconfigure the default setting of SystemInit() function, refer to
    

26.        system_stm32f10x.c file
    

27.      */
    

28.   /* Initialize LEDs and Key Button mounted on STM3210X-EVAL board */
    

29.   STM_EVAL_LEDInit(LED1);
    

30.   
    

31.   GPIO_SetBits(GPIOC, GPIO_Pin_7);
    

32. 
    

33.   /* Enable PWR and BKP clock */
    

34.   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE);//电源管理部分时钟开启
    

35. 
    

36.   /* Configure EXTI Line to generate an interrupt on falling edge */
    

37.   EXTI_Configuration();
    

38. 
    

39.   /* NVIC configuration */
    

40.   NVIC_Configuration();
    

41.  
    

42.   /* Configure the PVD Level to 2.9V */
    

43.   PWR_PVDLevelConfig(PWR_PVDLevel_2V9);// 设定监控阀值
    

44. 
    

45.   /* Enable the PVD Output */
    

46.   PWR_PVDCmd(ENABLE);// 使能PVD
    

47.   
    

48.   while (1)
    

49.   {
    

50.   }
    

51. }
    

52. 
    

53. /**
    

54.   * @brief Configures EXTI Lines.
    

55.   * @param None
    

56.   * @retval None
    

57.   */
    

58. void EXTI_Configuration(void)
    

59. {
    

60.   EXTI_InitTypeDef EXTI_InitStructure;
    

61. 
    

62.   /* Configure EXTI Line16(PVD Output) to generate an interrupt on rising and
    

63.      falling edges */
    

64.   EXTI_ClearITPendingBit(EXTI_Line16);
    

65.   EXTI_InitStructure.EXTI_Line = EXTI_Line16;// PVD连接到中断线16上
    

66.   EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;//使用中断模式
    

67.   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。
    

68.   EXTI_InitStructure.EXTI_LineCmd = ENABLE;// 使能中断线
    

69.   EXTI_Init(&EXTI_InitStructure);// 初始
    

70. }
    

71. 
    

72. /**
    

73.   * @brief Configures NVIC and Vector Table base location.
    

74.   * @param None
    

75.   * @retval None
    

76.   */
    

77. void NVIC_Configuration(void)
    

78. {
    

79.   NVIC_InitTypeDef NVIC_InitStructure;
    

80.   
    

81.   /* Configure one bit for preemption priority */
    

82.   NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1);//中断优先级配置
    

83.   
    

84.   /* Enable the PVD Interrupt */ //设置PVD中断
    

85.   NVIC_InitStructure.NVIC_IRQChannel = PVD_IRQn;
    

86.   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    

87.   NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    

88.   NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    

89.   NVIC_Init(&NVIC_InitStructure);
    

90. }

91. /******************* (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：

1. void PVD_IRQHandler(void)

2. {

3. if(EXTI_GetITStatus(EXTI_Line16) != RESET)

4. {

5. /* LED1翻转 */

6. STM_EVAL_LEDToggle(LED1);

7. 
   

8. /* Clear the Key Button EXTI line pending bit */

9. EXTI_ClearITPendingBit(EXTI_Line16);

10. }

11. }

12.