STM32F439xx HAL User Manual: stm32f4xx_hal

RTC HAL module driver. This file provides firmware functions to manage the following functionalities of the Real Time Clock (RTC) peripheral: + Initialization and de-initialization functions + RTC Time and Date functions + RTC Alarm functions + Peripheral Control functions + Peripheral State functions. More...

#include "stm32f4xx_hal.h"

Go to the source code of this file.

Functions
HAL_StatusTypeDef	HAL_RTC_Init (RTC_HandleTypeDef *hrtc)
	Initializes the RTC peripheral.
HAL_StatusTypeDef	HAL_RTC_DeInit (RTC_HandleTypeDef *hrtc)
	DeInitializes the RTC peripheral.
__weak void	HAL_RTC_MspInit (RTC_HandleTypeDef *hrtc)
	Initializes the RTC MSP.
__weak void	HAL_RTC_MspDeInit (RTC_HandleTypeDef *hrtc)
	DeInitializes the RTC MSP.
HAL_StatusTypeDef	HAL_RTC_SetTime (RTC_HandleTypeDef hrtc, RTC_TimeTypeDef sTime, uint32_t Format)
	Sets RTC current time.
HAL_StatusTypeDef	HAL_RTC_GetTime (RTC_HandleTypeDef hrtc, RTC_TimeTypeDef sTime, uint32_t Format)
	Gets RTC current time.
HAL_StatusTypeDef	HAL_RTC_SetDate (RTC_HandleTypeDef hrtc, RTC_DateTypeDef sDate, uint32_t Format)
	Sets RTC current date.
HAL_StatusTypeDef	HAL_RTC_GetDate (RTC_HandleTypeDef hrtc, RTC_DateTypeDef sDate, uint32_t Format)
	Gets RTC current date.
HAL_StatusTypeDef	HAL_RTC_SetAlarm (RTC_HandleTypeDef hrtc, RTC_AlarmTypeDef sAlarm, uint32_t Format)
	Sets the specified RTC Alarm.
HAL_StatusTypeDef	HAL_RTC_SetAlarm_IT (RTC_HandleTypeDef hrtc, RTC_AlarmTypeDef sAlarm, uint32_t Format)
	Sets the specified RTC Alarm with Interrupt.
HAL_StatusTypeDef	HAL_RTC_DeactivateAlarm (RTC_HandleTypeDef *hrtc, uint32_t Alarm)
	Deactivate the specified RTC Alarm.
HAL_StatusTypeDef	HAL_RTC_GetAlarm (RTC_HandleTypeDef hrtc, RTC_AlarmTypeDef sAlarm, uint32_t Alarm, uint32_t Format)
	Gets the RTC Alarm value and masks.
void	HAL_RTC_AlarmIRQHandler (RTC_HandleTypeDef *hrtc)
	This function handles Alarm interrupt request.
__weak void	HAL_RTC_AlarmAEventCallback (RTC_HandleTypeDef *hrtc)
	Alarm A callback.
HAL_StatusTypeDef	HAL_RTC_PollForAlarmAEvent (RTC_HandleTypeDef *hrtc, uint32_t Timeout)
	This function handles AlarmA Polling request.
HAL_StatusTypeDef	HAL_RTC_WaitForSynchro (RTC_HandleTypeDef *hrtc)
	Waits until the RTC Time and Date registers (RTC_TR and RTC_DR) are synchronized with RTC APB clock.
HAL_RTCStateTypeDef	HAL_RTC_GetState (RTC_HandleTypeDef *hrtc)
	Returns the RTC state.
HAL_StatusTypeDef	RTC_EnterInitMode (RTC_HandleTypeDef *hrtc)
	Enters the RTC Initialization mode.
uint8_t	RTC_ByteToBcd2 (uint8_t Value)
	Converts a 2 digit decimal to BCD format.
uint8_t	RTC_Bcd2ToByte (uint8_t Value)
	Converts from 2 digit BCD to Binary.

Detailed Description

Author:

MCD Application Team

  ==============================================================================
              ##### Backup Domain Operating Condition #####
  ==============================================================================
  [..] The real-time clock (RTC), the RTC backup registers, and the backup 
       SRAM (BKP SRAM) can be powered from the VBAT voltage when the main 
       VDD supply is powered off.
       To retain the content of the RTC backup registers, backup SRAM, and supply 
       the RTC when VDD is turned off, VBAT pin can be connected to an optional 
       standby voltage supplied by a battery or by another source.

  [..] To allow the RTC operating even when the main digital supply (VDD) is turned
       off, the VBAT pin powers the following blocks:
    (#) The RTC
    (#) The LSE oscillator
    (#) The backup SRAM when the low power backup regulator is enabled
    (#) PC13 to PC15 I/Os, plus PI8 I/O (when available)
  
  [..] When the backup domain is supplied by VDD (analog switch connected to VDD),
       the following pins are available:
    (#) PC14 and PC15 can be used as either GPIO or LSE pins
    (#) PC13 can be used as a GPIO or as the RTC_AF1 pin
    (#) PI8 can be used as a GPIO or as the RTC_AF2 pin
  
  [..] When the backup domain is supplied by VBAT (analog switch connected to VBAT 
       because VDD is not present), the following pins are available:
    (#) PC14 and PC15 can be used as LSE pins only
    (#) PC13 can be used as the RTC_AF1 pin 
    (#) PI8 can be used as the RTC_AF2 pin
             
                   ##### Backup Domain Reset #####
  ==================================================================
  [..] The backup domain reset sets all RTC registers and the RCC_BDCR register 
       to their reset values. The BKPSRAM is not affected by this reset. The only
       way to reset the BKPSRAM is through the Flash interface by requesting 
       a protection level change from 1 to 0.
  [..] A backup domain reset is generated when one of the following events occurs:
    (#) Software reset, triggered by setting the BDRST bit in the 
        RCC Backup domain control register (RCC_BDCR). 
    (#) VDD or VBAT power on, if both supplies have previously been powered off.  

                   ##### Backup Domain Access #####
  ==================================================================
  [..] After reset, the backup domain (RTC registers, RTC backup data 
       registers and backup SRAM) is protected against possible unwanted write 
       accesses. 
  [..] To enable access to the RTC Domain and RTC registers, proceed as follows:
    (+) Enable the Power Controller (PWR) APB1 interface clock using the
        __HAL_RCC_PWR_CLK_ENABLE() function.
    (+) Enable access to RTC domain using the HAL_PWR_EnableBkUpAccess() function.
    (+) Select the RTC clock source using the __HAL_RCC_RTC_CONFIG() function.
    (+) Enable RTC Clock using the __HAL_RCC_RTC_ENABLE() function.
  
  
                  ##### How to use this driver #####
  ==================================================================
  [..] 
    (+) Enable the RTC domain access (see description in the section above).
    (+) Configure the RTC Prescaler (Asynchronous and Synchronous) and RTC hour 
        format using the HAL_RTC_Init() function.
  
  *** Time and Date configuration ***
  ===================================
  [..] 
    (+) To configure the RTC Calendar (Time and Date) use the HAL_RTC_SetTime() 
        and HAL_RTC_SetDate() functions.
    (+) To read the RTC Calendar, use the HAL_RTC_GetTime() and HAL_RTC_GetDate() functions. 
  
  *** Alarm configuration ***
  ===========================
  [..]
    (+) To configure the RTC Alarm use the HAL_RTC_SetAlarm() function. 
        You can also configure the RTC Alarm with interrupt mode using the HAL_RTC_SetAlarm_IT() function.
    (+) To read the RTC Alarm, use the HAL_RTC_GetAlarm() function.
  
                  ##### RTC and low power modes #####
  ==================================================================
  [..] The MCU can be woken up from a low power mode by an RTC alternate 
       function.
  [..] The RTC alternate functions are the RTC alarms (Alarm A and Alarm B), 
       RTC wake-up, RTC tamper event detection and RTC time stamp event detection.
       These RTC alternate functions can wake up the system from the Stop and 
       Standby low power modes.
  [..] The system can also wake up from low power modes without depending 
       on an external interrupt (Auto-wake-up mode), by using the RTC alarm 
       or the RTC wake-up events.
  [..] The RTC provides a programmable time base for waking up from the 
       Stop or Standby mode at regular intervals.
       Wake-up from STOP and STANDBY modes is possible only when the RTC clock source
       is LSE or LSI.

Attention:

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Definition in file stm32f4xx_hal_rtc.c.

Functions

Detailed Description

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