help with rtc

[mauro2]

Posted on January 10, 2016 at 16:49

Hi, I'm trying the learn how to use rtc. can someone help me to understand how to inizialize rtc and how to use timestamp?

i'm using stm32f103 uCthanks 🙂

[Nesrine M_O]

Posted on January 11, 2016 at 09:39

Hi  Mr.Cscn,

I'd highly recommend you to start from RTC example under STM32Cube F1 package STM32Cube_FW_F1_V1.3.0\Projects\STM3210E_EVAL\Examples\RTC-Syrine-

[pkumar1883]

Posted on January 11, 2016 at 15:59

hi Mr.Cscn,

Use the following code-- int main(void) {     RCC_APB1PeriphClockCmd( RCC_APB1Periph_BKP | RCC_APB1Periph_PWR  , ENABLE);     RTC_NVIC_Config();     RTC_Init(); } void RTC_Config(void) {     PWR_BackupAccessCmd(ENABLE);     BKP_DeInit();     RCC_LSICmd(ENABLE);     while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {}     RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI  );     RCC_RTCCLKCmd(ENABLE);     RTC_WaitForSynchro();     RTC_WaitForLastTask();     RTC_SetPrescaler(32767);     RTC_WaitForLastTask();     RTC_ITConfig(RTC_IT_SEC, ENABLE);     RTC_WaitForLastTask(); } void RTC_NVIC_Config(void) {     NVIC_InitTypeDef NVIC_InitStructure;     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);     NVIC_InitStructure.NVIC_IRQChannel = RTC_IRQn;     NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;     NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;     NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;     NVIC_Init(&NVIC_InitStructure);     RTC_ITConfig(RTC_IT_SEC, ENABLE); } void RTC_Init(void) {     if (BKP_ReadBackupRegister(BKP_DR1) != 0xA5A5) {         RTC_Configuration();         Time_Adjust();         BKP_WriteBackupRegister(BKP_DR1, 0xA5A5);     } else {         RTC_WaitForSynchro();         RTC_WaitForLastTask();         PWR_BackupAccessCmd(ENABLE);     }     return; } void Time_Adjust(void) {     u32 counter = 1449100000;//set equl to current unix time stamp     RTC_WaitForLastTask();     RTC_SetCounter(counter);     RTC_WaitForLastTask(); } void RTC_IRQHandler(void){     if (RTC_GetITStatus(RTC_IT_SEC) != RESET){         RTC_ClearITPendingBit(RTC_IT_SEC);         RTC_WaitForLastTask();     } }