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80 lines
3.1 KiB
Plaintext
80 lines
3.1 KiB
Plaintext
/**
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@page RTC_ExitStandbyWithWakeUpTimer RTC example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file Examples_LL/RTC/RTC_ExitStandbyWithWakeUpTimer/readme.txt
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* @author MCD Application Team
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* @brief Description of the RTC example.
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******************************************************************************
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*
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* Copyright (c) 2017 STMicroelectronics. All rights reserved.
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*
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* This software component is licensed by ST under BSD 3-Clause license,
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* the "License"; You may not use this file except in compliance with the
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* License. You may obtain a copy of the License at:
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* opensource.org/licenses/BSD-3-Clause
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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This example shows how to configure the RTC in order to wake up from Standby mode
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using RTC Wakeup Timer. Peripheral initialization is done using LL unitary services
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functions for optimization purpose (performance and size).
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In this example, after start-up, SYSCLK is configured to the max frequency using
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the PLL with HSI as clock source.
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@note LSI oscillator clock is used as RTC clock source by default.
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The user can use also LSE as RTC clock source. The user uncomment the adequate
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line on the main.h file.
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@code
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#define RTC_CLOCK_SOURCE_LSI
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/* #define RTC_CLOCK_SOURCE_LSE */
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@endcode
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LSI oscillator clock is delivered by a 32 kHz RC.
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LSE (when available on board) is delivered by a 32.768 kHz crystal.
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Example execution:
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- 1st execution of the system, LED2 is quickly blinking (every 200ms).
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- Press the user button:
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* RTC wakup timer is configured to 5 seconds
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* System enters in standby mode (LED2 is switched off)
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- After 5 seconds, system resumes from standby mode, then LED2 is slowly blinking (every 500ms).
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- LED2 is toggling every 1 second: This indicates that the system generates an error.
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@par Keywords
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System, RTC, RTC Wakeup timer, Standby mode, LSI, LSE, Interrupt,
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@par Directory contents
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- RTC/RTC_ExitStandbyWithWakeUpTimer/Inc/stm32f4xx_it.h Interrupt handlers header file
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- RTC/RTC_ExitStandbyWithWakeUpTimer/Inc/main.h Header for main.c module
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- RTC/RTC_ExitStandbyWithWakeUpTimer/Inc/stm32_assert.h Template file to include assert_failed function
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- RTC/RTC_ExitStandbyWithWakeUpTimer/Src/stm32f4xx_it.c Interrupt handlers
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- RTC/RTC_ExitStandbyWithWakeUpTimer/Src/main.c Main program
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- RTC/RTC_ExitStandbyWithWakeUpTimer/Src/system_stm32f4xx.c STM32F4xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F411xx devices.
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- This example has been tested with NUCLEO-F411RE board and can be
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easily tailored to any other supported device and development board.
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@par How to use it ?
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In order to make the program work, you must do the following :
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- Open your preferred toolchain
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- Rebuild all files and load your image into target memory
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- Run the example
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* <h3><center>© COPYRIGHT STMicroelectronics</center></h3>
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*/
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