stm32l4xx_hal_rtc.c File Reference

RTC HAL module driver. This file provides firmware functions to manage the following functionalities of the Real-Time Clock (RTC) peripheral: + Initialization + Calendar (Time and Date) configuration + Alarms (Alarm A and Alarm B) configuration + WakeUp Timer configuration + TimeStamp configuration + Tampers configuration + Backup Data Registers configuration + RTC Tamper and TimeStamp Pins Selection + Interrupts and flags management. More...

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Detailed Description

RTC HAL module driver. This file provides firmware functions to manage the following functionalities of the Real-Time Clock (RTC) peripheral: + Initialization + Calendar (Time and Date) configuration + Alarms (Alarm A and Alarm B) configuration + WakeUp Timer configuration + TimeStamp configuration + Tampers configuration + Backup Data Registers configuration + RTC Tamper and TimeStamp Pins Selection + Interrupts and flags management.

Author:

MCD Application Team

Version:

V1.1.0

Date:

16-September-2015

 ===============================================================================   
                          ##### RTC Operating Condition #####
 ===============================================================================
  [..] The real-time clock (RTC) and the RTC backup registers can be powered
       from the VBAT voltage when the main VDD supply is powered off.
       To retain the content of the RTC backup registers 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.

                   ##### Backup Domain Reset #####
 ===============================================================================
  [..] The backup domain reset sets all RTC registers and the RCC_BDCR register
       to their reset values. 
       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.
    (#) Tamper detection event resets all data backup registers.

                   ##### 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:
    (#) Call the function HAL_RCCEx_PeriphCLKConfig with RCC_PERIPHCLK_RTC for
        PeriphClockSelection and select RTCClockSelection (LSE, LSI or HSEdiv32)
    (#) Enable RTC Clock using the __HAL_RCC_RTC_ENABLE() macro.

                  ##### How to use RTC 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 wakeup, 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-wakeup mode), by using the RTC alarm
       or the RTC wakeup events.
  [..] The RTC provides a programmable time base for waking up from the
       Stop or Standby mode at regular intervals.
       Wakeup from STOP and Standby modes is possible only when the RTC clock source
       is LSE or LSI.

   

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Definition in file stm32l4xx_hal_rtc.c.