STM32停机模式采用RTC_Alarm唤醒核心代码

#include "STM32_StopMode_RTC_wakeup.h" #define RTC_IRQChannel RTC_IRQn static ErrorStatus HSEStartUpStatus; //RTC闹钟初始化:启动时钟、配置LSI做RTC时钟、设置预分频40000得到1Hz void StopMode_Configuration(void) { EXTI_InitTypeDef EXTI_InitStructure; /* Enable PWR and BKP clocks */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR | RCC_APB1Periph_BKP, ENABLE); /* Allow access to BKP Domain */ PWR_BackupAccessCmd(ENABLE); /* Reset Backup Domain */ BKP_DeInit(); /* RTC clock source configuration ----------------------------------------*/ /* Enable the LSI OSC */ RCC_LSICmd(ENABLE); /* Wait till LSI is ready */ while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) { } /* Select the RTC Clock Source */ RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI); /* Enable the RTC Clock */ RCC_RTCCLKCmd(ENABLE); /* Wait for RTC registers synchronization */ RTC_WaitForSynchro(); /* Wait until last write operation on RTC registers has finished */ RTC_WaitForLastTask(); /* Set RTC prescaler: set RTC period to 1sec */ RTC_SetPrescaler(40000); /* Wait until last write operation on RTC registers has finished */ RTC_WaitForLastTask(); /* Configure EXTI Line17(RTC Alarm) to generate an interrupt on rising edge */ EXTI_ClearITPendingBit(EXTI_Line17); EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Event; EXTI_InitStructure.EXTI_Line = EXTI_Line17; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); } /******************************************************************************* * Function Name : SYSCLKConfig_STOP * Description : Configures system clock after wake-up from STOP: enable HSE, PLL * and select PLL as system clock source. * Input : None * Output : None * Return : None *******************************************************************************/ static void StopMode_SYSCLKConfig_STOP(void) { /* Enable HSE */ RCC_HSEConfig(RCC_HSE_ON); /* Wait till HSE is ready */ HSEStartUpStatus = RCC_WaitForHSEStartUp(); if(HSEStartUpStatus == SUCCESS) { /* Enable PLL */ RCC_PLLCmd(ENABLE); /* Wait till PLL is ready */ while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET) { } /* Select PLL as system clock source */ RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); /* Wait till PLL is used as system clock source */ while(RCC_GetSYSCLKSource() != 0x08) { } } } //设置待机时间并进入停止，闹钟事件发生自动退出Stop模式 //进入STOP模式，闹钟唤醒后跳出函数运行 //RAM、GPIO状态保持 //s为单位秒 void StopMode_EnterStopMode(u32 s) { //设置待机时间 RTC_SetAlarm(RTC_GetCounter() + s); RTC_WaitForLastTask(); /* LDO不关掉，闹钟事件唤醒*/ PWR_EnterSTOPMode(PWR_Regulator_ON, PWR_STOPEntry_WFE); //唤醒后重新配置系统时钟 StopMode_SYSCLKConfig_STOP(); }