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/**
@page RTC_Alarm RTC Alarm Example
@verbatim
******************************************************************************
* @file RTC/RTC_Alarm/readme.txt
* @author MCD Application Team
* @brief Description of the RTC Alarm example.
******************************************************************************
*
* Copyright (c) 2019 STMicroelectronics. All rights reserved.
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
@endverbatim
@par Example Description
Configuration and generation of an RTC alarm using the RTC HAL API.
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 64 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 LSI oscillator clock is used as RTC clock source by default.
The user can use also LSE as RTC clock source.
- The user uncomment the adequate line on the main.c file.
@code
#define RTC_CLOCK_SOURCE_LSI
/* #define RTC_CLOCK_SOURCE_LSE */
@endcode
LSI oscillator clock is delivered by a 32 kHz RC.
LSE (when available on board) is delivered by a 32.768 kHz crystal.
HAL_RTC_SetDate() and HAL_RTC_SetTime() functions are called to initialize the
time and the date.
HAL_RTC_SetAlarm_IT() function is then called to initialize the Alarm feature with
interrupt mode.
In this example, the Time is set to 02:20:00 and the Alarm must be generated after
30 seconds on 02:20:30.
LED2 is turned ON when the RTC Alarm is generated correctly.
The current time is updated and displayed on the debugger in aShowTime variable.
In case of error, LED3 is toggled with a period of one second.
@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 need 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/nucleo_wb15cc_conf.h BSP configuration file
- RTC/RTC_Alarm/Inc/stm32wbxx_hal_conf.h HAL configuration file
- RTC/RTC_Alarm/Inc/stm32wbxx_it.h Interrupt handlers header file
- RTC/RTC_Alarm/Inc/main.h Header for main.c module
- RTC/RTC_Alarm/Src/stm32wbxx_it.c Interrupt handlers
- RTC/RTC_Alarm/Src/main.c Main program
- RTC/RTC_Alarm/Src/stm32wbxx_hal_msp.c HAL MSP module
- RTC/RTC_Alarm/Src/system_stm32wbxx.c STM32WBxx system source file
@par Hardware and Software environment
- This example runs on STM32WB15CCUx devices.
- This example has been tested with STMicroelectronics NUCLEO-WB15CC
board 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
* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
*/
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