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XinLiArmfly

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发表于 2018-6-1 00:42:06 | 显示全部楼层 |阅读模式
STM32F4(PVD)
GitHub 仓库：https://github.com/XinLiGH/STM32F4xx_PVD_Example
PS：博文不再更新，后续更新会在 GitHub 仓库进行。

      在实际的产品需求中，常常需要产品在断电时保存一些参数或做一些断电保护，这就需要 MCU 能够检测到断电的过程，STM32 片上有电源电压检测器（PVD）给工程师的开发提供了方便，可以比较简单的检测到产品断电的过程。


1，开发环境

     1，固件库：STM32F4xx_DSP_StdPeriph_Lib_V1.8.0
     2，编译器：ARMCC V5.06
     3，IDE：Keil uVision5
     4，操作系统：Windows 10 专业版

2，程序源码
      PVD.h 文件
  1. /**
  2.   ******************************************************************************
  3.   * @file    PVD.h
  4.   * @author  XinLi
  5.   * @version v1.0
  6.   * @date    24-October-2017
  7.   * @brief   Header file for PVD.c module.
  8.   ******************************************************************************
  9.   * @attention
  10.   *
  11.   * <h2><center>Copyright &#169; 2017 XinLi</center></h2>
  12.   *
  13.   * This program is free software: you can redistribute it and/or modify
  14.   * it under the terms of the GNU General Public License as published by
  15.   * the Free Software Foundation, either version 3 of the License, or
  16.   * (at your option) any later version.
  17.   *
  18.   * This program is distributed in the hope that it will be useful,
  19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21.   * GNU General Public License for more details.
  22.   *
  23.   * You should have received a copy of the GNU General Public License
  24.   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  25.   *
  26.   ******************************************************************************
  27.   */

  29. #ifndef __PVD_H
  30. #define __PVD_H

  32. #ifdef __cplusplus
  33. extern "C" {
  34. #endif

  36. /* Header includes -----------------------------------------------------------*/
  37. #include "stm32f4xx.h"

  39. /* Macro definitions ---------------------------------------------------------*/
  40. #define PVD_IRQ_PreemptionPriority  (0)
  41. #define PVD_IRQ_SubPriority         (0)

  43. /* Type definitions ----------------------------------------------------------*/
  44. typedef enum
  45. {
  46.   PVD_Level_2V0 = PWR_PVDLevel_0,
  47.   PVD_Level_2V1 = PWR_PVDLevel_1,
  48.   PVD_Level_2V3 = PWR_PVDLevel_2,
  49.   PVD_Level_2V5 = PWR_PVDLevel_3,
  50.   PVD_Level_2V6 = PWR_PVDLevel_4,
  51.   PVD_Level_2V7 = PWR_PVDLevel_5,
  52.   PVD_Level_2V8 = PWR_PVDLevel_6,
  53.   PVD_Level_2V9 = PWR_PVDLevel_7
  54. }PVD_Level;

  56. typedef enum
  57. {
  58.   PVD_Output_High = 0,
  59.   PVD_Output_Low  = 1
  60. }PVD_Output;

  62. typedef void (*PVD_Callback)(PVD_Output output);

  64. /* Variable declarations -----------------------------------------------------*/
  65. /* Variable definitions ------------------------------------------------------*/
  66. /* Function declarations -----------------------------------------------------*/
  67. void PVD_Init(PVD_Level level, PVD_Callback function);
  68. void PVD_DeInit(void);

  70. void PVD_SetLevel(PVD_Level level);
  71. PVD_Level PVD_GetLevel(void);

  73. void PVD_SetCallback(PVD_Callback function);
  74. PVD_Callback PVD_GetCallback(void);

  76. PVD_Output PVD_GetOutput(void);

  78. /* Function definitions ------------------------------------------------------*/

  80. #ifdef __cplusplus
  81. }
  82. #endif

  84. #endif /* __PVD_H */
复制代码

      PVD.c 文件
  1. /**
  2.   ******************************************************************************
  3.   * @file    PVD.c
  4.   * @author  XinLi
  5.   * @version v1.0
  6.   * @date    24-October-2017
  7.   * @brief   Power voltage detector driver.
  8.   ******************************************************************************
  9.   * @attention
  10.   *
  11.   * <h2><center>Copyright &#169; 2017 XinLi</center></h2>
  12.   *
  13.   * This program is free software: you can redistribute it and/or modify
  14.   * it under the terms of the GNU General Public License as published by
  15.   * the Free Software Foundation, either version 3 of the License, or
  16.   * (at your option) any later version.
  17.   *
  18.   * This program is distributed in the hope that it will be useful,
  19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21.   * GNU General Public License for more details.
  22.   *
  23.   * You should have received a copy of the GNU General Public License
  24.   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  25.   *
  26.   ******************************************************************************
  27.   */

  29. /* Header includes -----------------------------------------------------------*/
  30. #include "PVD.h"
  31. #include <string.h>

  33. /* Macro definitions ---------------------------------------------------------*/
  34. /* Type definitions ----------------------------------------------------------*/
  35. /* Variable declarations -----------------------------------------------------*/
  36. /* Variable definitions ------------------------------------------------------*/
  37. static __IO PVD_Callback callback = NULL;

  39. /* Function declarations -----------------------------------------------------*/
  40. /* Function definitions ------------------------------------------------------*/

  42. /**
  43.   * @brief  Power voltage detector initialize.
  44.   * @param  [in] level:    Power voltage detector level.
  45.   * @param  [in] function: Power voltage detector callback.
  46.   * @return None.
  47.   */
  48. void PVD_Init(PVD_Level level, PVD_Callback function)
  49. {
  50.   EXTI_InitTypeDef EXTI_InitStructure = {0};
  51.   NVIC_InitTypeDef NVIC_InitStructure = {0};
  52.   
  53.   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
  54.   
  55.   EXTI_InitStructure.EXTI_Line    = EXTI_Line16;
  56.   EXTI_InitStructure.EXTI_Mode    = EXTI_Mode_Interrupt;
  57.   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
  58.   EXTI_InitStructure.EXTI_LineCmd = ENABLE;
  59.   EXTI_Init(&EXTI_InitStructure);
  60.   
  61.   NVIC_InitStructure.NVIC_IRQChannel                   = PVD_IRQn;
  62.   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = PVD_IRQ_PreemptionPriority;
  63.   NVIC_InitStructure.NVIC_IRQChannelSubPriority        = PVD_IRQ_SubPriority;
  64.   NVIC_InitStructure.NVIC_IRQChannelCmd                = ENABLE;
  65.   NVIC_Init(&NVIC_InitStructure);
  66.   
  67.   PWR_PVDLevelConfig(level);
  68.   PWR_PVDCmd(ENABLE);
  69.   
  70.   callback = function;
  71. }

  73. /**
  74.   * @brief  Power voltage detector deinitializes.
  75.   * @param  None.
  76.   * @return None.
  77.   */
  78. void PVD_DeInit(void)
  79. {
  80.   EXTI_InitTypeDef EXTI_InitStructure = {0};
  81.   NVIC_InitTypeDef NVIC_InitStructure = {0};
  82.   
  83.   EXTI_InitStructure.EXTI_Line    = EXTI_Line16;
  84.   EXTI_InitStructure.EXTI_Mode    = EXTI_Mode_Interrupt;
  85.   EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling;
  86.   EXTI_InitStructure.EXTI_LineCmd = DISABLE;
  87.   EXTI_Init(&EXTI_InitStructure);
  88.   
  89.   NVIC_InitStructure.NVIC_IRQChannel                   = PVD_IRQn;
  90.   NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = PVD_IRQ_PreemptionPriority;
  91.   NVIC_InitStructure.NVIC_IRQChannelSubPriority        = PVD_IRQ_SubPriority;
  92.   NVIC_InitStructure.NVIC_IRQChannelCmd                = DISABLE;
  93.   NVIC_Init(&NVIC_InitStructure);
  94.   
  95.   PWR_PVDCmd(DISABLE);
  96.   
  97.   callback = NULL;
  98. }

  100. /**
  101.   * @brief  Set power voltage detector level.
  102.   * @param  [in] level: Power voltage detector level.
  103.   * @return None.
  104.   */
  105. void PVD_SetLevel(PVD_Level level)
  106. {
  107.   PWR_PVDLevelConfig(level);
  108. }

  110. /**
  111.   * @brief  Get power voltage detector level.
  112.   * @param  None.
  113.   * @return Power voltage detector level.
  114.   */
  115. PVD_Level PVD_GetLevel(void)
  116. {
  117.   uint32_t tmpreg = PWR->CR;
  118.   
  119.   return (PVD_Level)(tmpreg & 0xE0);
  120. }

  122. /**
  123.   * @brief  Set power voltage detector callback.
  124.   * @param  [in] function: Power voltage detector callback.
  125.   * @return None.
  126.   */
  127. void PVD_SetCallback(PVD_Callback function)
  128. {
  129.   callback = function;
  130. }

  132. /**
  133.   * @brief  Get power voltage detector callback.
  134.   * @param  None.
  135.   * @return Power voltage detector callback.
  136.   */
  137. PVD_Callback PVD_GetCallback(void)
  138. {
  139.   return callback;
  140. }

  142. /**
  143.   * @brief  Get power voltage detector output.
  144.   * @param  None.
  145.   * @return Power voltage detector output.
  146.   */
  147. PVD_Output PVD_GetOutput(void)
  148. {
  149.   uint32_t tmpreg = PWR->CSR;
  150.   
  151.   return (PVD_Output)((tmpreg >> 2) & 0x01);
  152. }

  154. /**
  155.   * @brief  This function handles the PVD Output interrupt request.
  156.   * @param  None.
  157.   * @return None.
  158.   */
  159. void PVD_IRQHandler(void)
  160. {
  161.   if(EXTI_GetITStatus(EXTI_Line16) != RESET)
  162.   {
  163.     EXTI_ClearITPendingBit(EXTI_Line16);
  164.    
  165.     if(callback != NULL)
  166.     {
  167.       callback(PVD_GetOutput());
  168.     }
  169.   }
  170. }
复制代码


      main.c 文件

  1. /**
  2.   ******************************************************************************
  3.   * @file    main.c
  4.   * @author  XinLi
  5.   * @version v1.0
  6.   * @date    24-October-2017
  7.   * @brief   Main program body.
  8.   ******************************************************************************
  9.   * @attention
  10.   *
  11.   * <h2><center>Copyright &#169; 2017 XinLi</center></h2>
  12.   *
  13.   * This program is free software: you can redistribute it and/or modify
  14.   * it under the terms of the GNU General Public License as published by
  15.   * the Free Software Foundation, either version 3 of the License, or
  16.   * (at your option) any later version.
  17.   *
  18.   * This program is distributed in the hope that it will be useful,
  19.   * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20.   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21.   * GNU General Public License for more details.
  22.   *
  23.   * You should have received a copy of the GNU General Public License
  24.   * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  25.   *
  26.   ******************************************************************************
  27.   */

  29. /* Header includes -----------------------------------------------------------*/
  30. #include "main.h"
  31. #include "PVD.h"
  32. #include "LED.h"

  34. /* Macro definitions ---------------------------------------------------------*/
  35. /* Type definitions ----------------------------------------------------------*/
  36. /* Variable declarations -----------------------------------------------------*/
  37. /* Variable definitions ------------------------------------------------------*/
  38. /* Function declarations -----------------------------------------------------*/
  39. static void PowerDownProtect(PVD_Output output);

  41. /* Function definitions ------------------------------------------------------*/

  43. /**
  44.   * @brief  Main program.
  45.   * @param  None.
  46.   * @return None.
  47.   */
  48. int main(void)
  49. {
  50.   LED_SetStatus(LED_Pin1, LED_On);
  51.   LED_SetStatus(LED_Pin2, LED_Off);
  52.   
  53.   PVD_Init(PVD_Level_2V5, PowerDownProtect);
  54.   
  55.   for(;;)
  56.   {
  57.    
  58.   }
  59. }

  61. /**
  62.   * @brief  Power voltage detector callback.
  63.   * @param  [in] output: Power voltage detector output.
  64.   * @return None.
  65.   */
  66. static void PowerDownProtect(PVD_Output output)
  67. {
  68.   if(output == PVD_Output_High)
  69.   {
  70.     LED_SetStatus(LED_Pin1, LED_On);
  71.     LED_SetStatus(LED_Pin2, LED_Off);
  72.   }
  73.   else
  74.   {
  75.     LED_SetStatus(LED_Pin1, LED_Off);
  76.     LED_SetStatus(LED_Pin2, LED_On);
  77.   }
  78. }
复制代码




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发表于 2018-6-1 01:58:49 | 显示全部楼层
谢谢楼主分享。
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发表于 2019-9-5 12:14:47 | 显示全部楼层
假如有的数据在存在外部EEPROM或SD卡中，MCU检测到断电时，来及得把数据写到外部存储器么？？检测到断电时的电压可能不能支持外部存储器正常工作会不会。
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发表于 2019-9-5 12:28:56 | 显示全部楼层
兵哥哥 发表于 2019-9-5 12:14
假如有的数据在存在外部EEPROM或SD卡中，MCU检测到断电时，来及得把数据写到外部存储器么？？检测到断电时 ...

如果有备份电源或者超级电容的话，可以续命。如果没有的话，可以用备份sram，完全来得及存储，不过需要给rtc加电池供电
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