/**
@page RTC_Alarm RTC Alarm example
@verbatim
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
* @file RTC/RTC_Alarm/readme.txt
* @author MCD Application Team
* @brief Description of the RTC Alarm example.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
@endverbatim
@par Example Description
This example guides you through the different configuration steps by means of the RTC
HAL API to configure and generate an RTC alarm.
At the beginning of the main program the HAL_Init() function is called to reset
all the peripherals, initialize the Flash interface and the systick.
Then the SystemClock_Config() function is used to configure the system
clock (SYSCLK) to run at 168 MHz.
The RTC peripheral configuration is ensured by the HAL_RTC_Init() function.
This later is calling the HAL_RTC_MspInit()function which core is implementing
the configuration of the needed RTC resources according to the used hardware (CLOCK,
PWR, RTC clock source and BackUp). You may update this function to change RTC configuration.
@note LSE oscillator clock is used as RTC clock source by default. LSE oscillator
clock usually delivered by a 32.768 kHz quartz.
The user can use also LSI as RTC clock source. The user uncomment the adequate
line on the main.h file.
@code
#define RTC_CLOCK_SOURCE_LSE
/* #define RTC_CLOCK_SOURCE_LSI */
@endcode
HAL_RTC_SetAlarm_IT() function is called to initialize the Alarm feature with
interrupt mode.
HAL_RTC_SetDate() and HAL_RTC_SetTime() functions are then called to initialize the
time and the date.
In this example, the Time is set to 02:20:00 and the Alarm must be generated after
30 seconds on 02:20:30.
LED1 is turned ON when the RTC Alarm is generated correctly.
The current time is updated and displayed on the debugger in aShowTime variable.
@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
@note The application needs to ensure that the SysTick time base is always set to 1 millisecond
to have correct HAL operation.
@par Keywords
System, RTC, Alarm, wakeup timer, Backup domain, Counter, LSE, LSI
@par Directory contents
- RTC/RTC_Alarm/Inc/stm32f4xx_hal_conf.h HAL configuration file
- RTC/RTC_Alarm/Inc/stm32f4xx_it.h Interrupt handlers header file
- RTC/RTC_Alarm/Inc/main.h Main program header file
- RTC/RTC_Alarm/Src/stm32f4xx_it.c Interrupt handlers
- RTC/RTC_Alarm/Src/main.c Main program
- RTC/RTC_Alarm/Src/stm32f4xx_hal_msp.c HAL MSP module
- RTC/RTC_Alarm/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
@par Hardware and Software environment
- This example runs on STM32F407xx/417xx devices.
- This example has been tested with STMicroelectronics STM324xG-EVAL RevC
evaluation boards and can be easily tailored to any other supported device
and development board.
@par How to use it ?
In order to make the program work, you must do the following :
- Open your preferred toolchain
- Rebuild all files and load your image into target memory
- Run the example
*/
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