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          EEPW首頁 > 嵌入式系統(tǒng) > 設(shè)計應(yīng)用 > 如何使用STM32的PVD對電源的電壓進(jìn)行監(jiān)控

          如何使用STM32的PVD對電源的電壓進(jìn)行監(jiān)控

          作者: 時間:2016-12-02 來源:網(wǎng)絡(luò) 收藏
          用戶在使用STM32時,可以利用其內(nèi)部的PVD對VDD的電壓進(jìn)行監(jiān)控,通過電源控制寄存器(PWR_CR)中的PLS[2:0]位來設(shè)定監(jiān)控的電壓值。
          PLS[2:0]位用于選擇PVD監(jiān)控電源的電壓閥值:
          000:2.2V
          001:2.3V
          010:2.4V
          011:2.5V
          100:2.6V
          101:2.7V
          110:2.8V
          111:2.9V
          在電源控制/狀態(tài)寄存器(PWR_CSR)中的PVDO標(biāo)志用來表明VDD是高于還是低于PVD設(shè)定的電壓閥值。該事件連接到外部中斷的第16線,如果該中斷在外部中斷寄存器中被使能的,該事件就會產(chǎn)生中斷。當(dāng)VDD下降到PVD閥值以下和(或)當(dāng)VDD上升到PVD閥值之上時,根據(jù)外部中斷第16 線的上升/下降邊沿觸發(fā)設(shè)置,就會產(chǎn)生PVD中斷。這一特性可用于發(fā)現(xiàn)電壓出現(xiàn)異常時,執(zhí)行緊急關(guān)閉任務(wù)。
          下面是用于測試PVD的代碼:
          主程序的代碼:
          /* Includes ------------------------------------------------------------------*/
          #include "stm32f10x_lib.h"
          /* Private typedef -----------------------------------------------------------*/
          typedef enum {FAILED = 0, PASSED = !FAILED} TestStatus;
          /* Private define ------------------------------------------------------------*/
          /* Private macro -------------------------------------------------------------*/
          /* Private variables ---------------------------------------------------------*/
          ErrorStatus HSEStartUpStatus;
          /* Private function prototypes -----------------------------------------------*/
          void RCC_Configuration(void);
          void GPIO_Configuration(void);
          void EXTI_Configuration(void);
          void NVIC_Configuration(void);
          /* Private functions ---------------------------------------------------------*/
          STM32 中文應(yīng)用文檔
          /*****************************************************************************
          * Function Name : main
          * Description : Main program
          * Input : None
          * Output : None
          * Return : None
          ******************************************************************************/
          int main(void)
          {
          RCC_Configuration(); /* System Clocks Configuration */
          GPIO_Configuration(); /* Configure the GPIO ports */
          NVIC_Configuration(); /* NVIC configuration */
          EXTI_Configuration();
          PWR_PVDLevelConfig(PWR_PVDLevel_2V8);
          PWR_PVDCmd(ENABLE);
          while(1) {}
          }
          /*******************************************************************
          * Function Name : RCC_Configuration
          * Description : Configures the different system clocks.
          * Input : None
          * Output : None
          * Return : None
          ********************************************************************/
          void RCC_Configuration(void)
          {
          RCC_DeInit(); // RCC system reset(for debug purpose)
          RCC_HSEConfig(RCC_HSE_ON); // Enable HSE
          HSEStartUpStatus = RCC_WaitForHSEStartUp(); // Wait till HSE is ready
          if(HSEStartUpStatus == SUCCESS) {
          RCC_HCLKConfig(RCC_SYSCLK_Div1); // HCLK = SYSCLK
          RCC_PCLK2Config(RCC_HCLK_Div1); // PCLK2 = HCLK
          RCC_PCLK1Config(RCC_HCLK_Div1); // PCLK1 = HCLK/2
          FLASH_SetLatency(FLASH_Latency_2); // Flash 2 wait state
          FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); // Enable Prefetch Buffer
          RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); // PLLCLK = 8MHz * 9 = 72 MHz
          RCC_PLLCmd(ENABLE); // Enable PLL
          while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) {} // Wait till PLL is ready
          RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); // Select PLL as system clock source
          while(RCC_GetSYSCLKSource() != 0x08) {} // Wait till PLL is used as system clock source
          }
          RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
          RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
          }
          STM32 中文應(yīng)用文檔
          /****************************************************************
          * Function Name : GPIO_Configuration
          * Description : Configures the different GPIO ports.
          * Input : None
          * Output : None
          * Return : None
          ****************************************************************/
          void GPIO_Configuration(void)
          {
          GPIO_InitTypeDef GPIO_InitStructure;
          GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8;
          GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
          GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT_PP;
          GPIO_Init(GPIOB, &GPIO_InitStructure); //GPIO B
          }
          /*******************************************************************
          * Function Name : EXTI_Configuration
          * Description : Configures .
          * Input : None
          * Output : None
          * Return : None
          ********************************************************************/
          void EXTI_Configuration(void)
          {
          EXTI_InitTypeDef EXTI_InitStructure;
          EXTI_DeInit();
          EXTI_StructInit(&EXTI_InitStructure);
          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); // Configure EXTI Line16 to generate an interrupt
          }
          /***************************************************************************
          * Function Name : NVIC_Configuration
          * Description : Configures Vector Table base location.
          * Input : None
          * Output : None
          * Return : None
          **************************************************************************/
          void NVIC_Configuration(void)
          {
          NVIC_InitTypeDef NVIC_InitStructure;
          #ifdef VECT_TAB_RAM
          /* Set the Vector Table base location at 0x20000000 */
          NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
          #else /* VECT_TAB_FLASH */
          /* Set the Vector Table base location at 0x08000000 */
          NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
          #endif
          STM32 中文應(yīng)用文檔
          NVIC_PriorityGroupConfig(NVIC_PriorityGroup_1); // Configure one bit for preemption priority
          NVIC_InitStructure.NVIC_IRQChannel = PVD_IRQChannel;
          NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
          NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
          NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
          NVIC_Init(&NVIC_InitStructure); // Enable the PVD Interrupt
          }
          中斷程序:
          /**************************************************************************
          * Function Name : PVD_IRQHandler
          * Description : This function handles PVD interrupt request.
          * Input : None
          * Output : None
          * Return : None
          ***************************************************************************/
          void PVD_IRQHandler(void)
          {
          if (PWR_GetFlagStatus(PWR_FLAG_PVDO))
          GPIO_WriteBit(GPIOB, 1 << 5, Bit_SET);
          else
          GPIO_WriteBit(GPIOB, 1 << 5, Bit_RESET);
          }
          注:在void EXTI_Configuration(void)中,對于EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising_Falling; 中的初始化值,根據(jù)你的需要進(jìn)行修改,具體細(xì)節(jié)如下:
          EXTI_Trigger_Rising --- 表示電壓從高電壓下降到低于設(shè)定的電壓閥值產(chǎn)生中斷;
          EXTI_Trigger_Falling --- 表示電壓從低電壓上升到高于設(shè)定的電壓閥值產(chǎn)生中斷;
          EXTI_Trigger_Rising_Falling --- 表示電壓從高電壓下降到低于設(shè)定的電壓閥值、或從低電壓上升到高于設(shè)定的電壓閥值產(chǎn)生中斷。


          關(guān)鍵詞: STM32PVD監(jiān)

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