stm32f4xx_hal_timebase_rtc_alarm_template.c

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/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
 
/* Uncomment the line below to select the appropriate RTC Clock source for your application: 
  + RTC_CLOCK_SOURCE_HSE: can be selected for applications requiring timing precision.
  + RTC_CLOCK_SOURCE_LSE: can be selected for applications with low constraint on timing
                          precision.
  + RTC_CLOCK_SOURCE_LSI: can be selected for applications with low constraint on timing
                          precision.
  */
#define RTC_CLOCK_SOURCE_HSE
/* #define RTC_CLOCK_SOURCE_LSE */
/* #define RTC_CLOCK_SOURCE_LSI */
 
#ifdef RTC_CLOCK_SOURCE_HSE
  #define RTC_ASYNCH_PREDIV       99U
  #define RTC_SYNCH_PREDIV        9U
  #define RCC_RTCCLKSOURCE_1MHZ   ((uint32_t)((uint32_t)RCC_BDCR_RTCSEL | (uint32_t)((HSE_VALUE/1000000U) << 16U)))
#else /* RTC_CLOCK_SOURCE_LSE || RTC_CLOCK_SOURCE_LSI */
  #define RTC_ASYNCH_PREDIV       0U
  #define RTC_SYNCH_PREDIV        31U
#endif /* RTC_CLOCK_SOURCE_HSE */
 
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
RTC_HandleTypeDef        hRTC_Handle;
/* Private function prototypes -----------------------------------------------*/
void RTC_Alarm_IRQHandler(void);
/* Private functions ---------------------------------------------------------*/
 
HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
{
  __IO uint32_t counter = 0U;
 
  RCC_OscInitTypeDef        RCC_OscInitStruct;
  RCC_PeriphCLKInitTypeDef  PeriphClkInitStruct;
  HAL_StatusTypeDef     status;
 
#ifdef RTC_CLOCK_SOURCE_LSE
  /* Configure LSE as RTC clock source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSE;
#elif defined (RTC_CLOCK_SOURCE_LSI)
  /* Configure LSI as RTC clock source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSI;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  RCC_OscInitStruct.LSIState = RCC_LSI_ON;
  PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_LSI;
#elif defined (RTC_CLOCK_SOURCE_HSE)
  /* Configure HSE as RTC clock source */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  /* Ensure that RTC is clocked by 1MHz */
  PeriphClkInitStruct.RTCClockSelection = RCC_RTCCLKSOURCE_1MHZ;
#else
#error Please select the RTC Clock source
#endif /* RTC_CLOCK_SOURCE_LSE */
 
  status = HAL_RCC_OscConfig(&RCC_OscInitStruct);
  if (status == HAL_OK)
  {
    PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_RTC;
    status = HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
  }
  if (status == HAL_OK)
  {
    /* Enable RTC Clock */
    __HAL_RCC_RTC_ENABLE();
    /* The time base should be 1ms
       Time base = ((RTC_ASYNCH_PREDIV + 1) * (RTC_SYNCH_PREDIV + 1)) / RTC_CLOCK
       HSE as RTC clock
         Time base = ((99 + 1) * (9 + 1)) / 1MHz
                   = 1ms
       LSE as RTC clock
         Time base = ((31 + 1) * (0 + 1)) / 32.768KHz
                   = ~1ms
       LSI as RTC clock
         Time base = ((31 + 1) * (0 + 1)) / 32KHz
                   = 1ms
    */
    hRTC_Handle.Instance = RTC;
    hRTC_Handle.Init.HourFormat = RTC_HOURFORMAT_24;
    hRTC_Handle.Init.AsynchPrediv = RTC_ASYNCH_PREDIV;
    hRTC_Handle.Init.SynchPrediv = RTC_SYNCH_PREDIV;
    hRTC_Handle.Init.OutPut = RTC_OUTPUT_DISABLE;
    hRTC_Handle.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
    hRTC_Handle.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
    status = HAL_RTC_Init(&hRTC_Handle);
  }
  if (status == HAL_OK)
  {
    /* Disable the write protection for RTC registers */
    __HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle);
 
    /* Disable the Alarm A interrupt */
    __HAL_RTC_ALARMA_DISABLE(&hRTC_Handle);
 
    /* Clear flag alarm A */
    __HAL_RTC_ALARM_CLEAR_FLAG(&hRTC_Handle, RTC_FLAG_ALRAF);
 
    counter = 0U;
    /* Wait till RTC ALRAWF flag is set and if Time out is reached exit */
    while (__HAL_RTC_ALARM_GET_FLAG(&hRTC_Handle, RTC_FLAG_ALRAWF) == RESET)
    {
      if (counter++ == (SystemCoreClock / 48U)) /* Timeout = ~ 1s */
      {
        status =  HAL_ERROR;
      }
    }
  }
  if (status == HAL_OK)
  {
    hRTC_Handle.Instance->ALRMAR = (uint32_t)0x01U;
 
    /* Configure the Alarm state: Enable Alarm */
    __HAL_RTC_ALARMA_ENABLE(&hRTC_Handle);
    /* Configure the Alarm interrupt */
    __HAL_RTC_ALARM_ENABLE_IT(&hRTC_Handle, RTC_IT_ALRA);
 
    /* RTC Alarm Interrupt Configuration: EXTI configuration */
    __HAL_RTC_ALARM_EXTI_ENABLE_IT();
    __HAL_RTC_ALARM_EXTI_ENABLE_RISING_EDGE();
 
    /* Check if the Initialization mode is set */
    if ((hRTC_Handle.Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET)
    {
      /* Set the Initialization mode */
      hRTC_Handle.Instance->ISR = (uint32_t)RTC_INIT_MASK;
      counter = 0U;
      while ((hRTC_Handle.Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET)
      {
        if (counter++ == (SystemCoreClock / 48U)) /* Timeout = ~ 1s */
        {
          status = HAL_ERROR;
        }
      }
    }
  }
  if (status == HAL_OK)
  {
    hRTC_Handle.Instance->DR = 0U;
    hRTC_Handle.Instance->TR = 0U;
 
    hRTC_Handle.Instance->ISR &= (uint32_t)~RTC_ISR_INIT;
 
    /* Enable the write protection for RTC registers */
    __HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle);
 
    /* Enable the RTC Alarm Interrupt */
    HAL_NVIC_EnableIRQ(RTC_Alarm_IRQn);
 
    /* Configure the SysTick IRQ priority */
    if (TickPriority < (1UL << __NVIC_PRIO_BITS))
    {
      HAL_NVIC_SetPriority(RTC_Alarm_IRQn, TickPriority, 0U);
      uwTickPrio = TickPriority;
    }
    else
    {
      status = HAL_ERROR;
    }
 
  }
  return status;
}
 
void HAL_SuspendTick(void)
{
  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle);
  /* Disable RTC ALARM update Interrupt */
  __HAL_RTC_ALARM_DISABLE_IT(&hRTC_Handle, RTC_IT_ALRA);
  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle);
}
 
void HAL_ResumeTick(void)
{
  /* Disable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_DISABLE(&hRTC_Handle);
  /* Enable RTC ALARM Update interrupt */
  __HAL_RTC_ALARM_ENABLE_IT(&hRTC_Handle, RTC_IT_ALRA);
  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(&hRTC_Handle);
}
 
void HAL_RTC_AlarmAEventCallback(RTC_HandleTypeDef *hrtc)
{
  __IO uint32_t counter = 0U;
 
  HAL_IncTick();
 
  __HAL_RTC_WRITEPROTECTION_DISABLE(hrtc);
 
  /* Set the Initialization mode */
  hrtc->Instance->ISR = (uint32_t)RTC_INIT_MASK;
 
  while((hrtc->Instance->ISR & RTC_ISR_INITF) == (uint32_t)RESET)
  {
    if(counter++ == (SystemCoreClock /48U)) /* Timeout = ~ 1s */
    {
      break;
    }
  }
 
  hrtc->Instance->DR = 0U;
  hrtc->Instance->TR = 0U;
 
  hrtc->Instance->ISR &= (uint32_t)~RTC_ISR_INIT;
 
  /* Enable the write protection for RTC registers */
  __HAL_RTC_WRITEPROTECTION_ENABLE(hrtc);
}
 
void RTC_Alarm_IRQHandler(void)
{
  HAL_RTC_AlarmIRQHandler(&hRTC_Handle);
}