wifigateway/Src/rtc.c

#include "rtc.h"
#include "stm32f4xx_hal.h"

void RTC_Init()
{
    /* Peripheral clock enable */
    __HAL_RCC_RTC_ENABLE();
    /* Peripheral interrupt init*/
    HAL_NVIC_SetPriority(RTC_WKUP_IRQn, 7, 0);
    HAL_NVIC_EnableIRQ(RTC_WKUP_IRQn);

    /* Disable the write protection for RTC registers */
    RTC->WPR = 0xCA;
    RTC->WPR = 0x53;

    /* Check if the Initialization mode is set */
    if((RTC->ISR & RTC_ISR_INITF) == (uint32_t)RESET)
    {
        /* Set the Initialization mode */
        RTC->ISR = (uint32_t)RTC_INIT_MASK;

        /* Wait till RTC is in INIT state and if Time out is reached exit */
        while((RTC->ISR & RTC_ISR_INITF) == (uint32_t)RESET);
    }

    /* Clear RTC_CR FMT, OSEL and POL Bits */
    RTC->CR &= ((uint32_t)~(RTC_CR_FMT | RTC_CR_OSEL | RTC_CR_POL));
    /* Set RTC_CR register */
    RTC->CR |= (uint32_t)(RTC_HOURFORMAT_24 | RTC_OUTPUT_DISABLE | RTC_OUTPUT_POLARITY_HIGH);

    /* Configure the RTC PRER */
    RTC->PRER = (uint32_t)(255);
    RTC->PRER |= (uint32_t)(127 << 16);

    /* Exit Initialization mode */
    RTC->ISR &= (uint32_t)~RTC_ISR_INIT; 

    RTC->TAFCR &= (uint32_t)~RTC_TAFCR_ALARMOUTTYPE;
    RTC->TAFCR |= (uint32_t)(RTC_OUTPUT_TYPE_OPENDRAIN); 

    /* Enable the write protection for RTC registers */
    RTC->WPR = 0xFF;

    /**Enable the WakeUp 
    */
    //HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 59, RTC_WAKEUPCLOCK_CK_SPRE_16BITS);
}