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