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 uC

thanks :)

[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();

    }

}