99 lines
4.3 KiB
Plaintext
99 lines
4.3 KiB
Plaintext
/**
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@page RTC_TimeStamp_Init RTC example
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@verbatim
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******************************************************************************
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* @file Examples_LL/RTC/RTC_TimeStamp_Init/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) 2020 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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Configuration of the Timestamp using the RTC LL API. The peripheral initialization
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uses LL unitary service functions for optimization purposes (performance and size).
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In this example, after start-up, SYSCLK is configured to the max frequency using the PLL with
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MSI as clock source.
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The RTC peripheral configuration is ensured by the Configure_RTC() function
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(configure of the needed RTC resources according to the used hardware CLOCK,
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PWR, RTC clock source and BackUp). You may update this function to change RTC configuration.
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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.
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- The user uncomment the adequate line on the main.c 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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- Open the ioc file with STM32CubeMX and select :
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LSE as "Crystal/Ceramic Resonator" in RCC configuration.
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LSE as RTC clock source in Clock configuration.
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- Generate code
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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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Configure_RTC_TimeStamp() function is then called to initialize the time stamp feature
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with interrupt mode. It configures the time stamp pin to be rising edge and enables
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the time stamp detection on time stamp pin.
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LL_RTC_DATE_Config()and LL_RTC_TIME_Config() functions are then called to initialize the
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time and the date.
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The associated firmware performs the following:
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1. After start-up the program configure the RTC (Time date) and enable the feature
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timeStamp.
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2. When applying a rising edge on the time stamp pin (PC.13),
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a time stamp event is detected and the calendar is saved in the time stamp structures.
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The current date and time stamp are updated and displayed.
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Note: On this board, time stamp pin is not connected to User push-button (B1) (pin PA.00).
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Therefore, an external connection is needed:
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- to generate a time stamp event using User push-button (B1): connect PC.13 to PA.00.
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- to generate a time stamp event using external signal: connect PC.13 to voltage level 0V or 3.3V.
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on the debugger (live watch) in aShowTimeStamp and aShowDateStamp variables .
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The current time and date are updated and displayed on the debugger (live watch) in aShowTime, aShowDate variables .
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- LED2 is toggling : This indicates that the system generates an error.
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@par Keywords
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RTC, Timer, Timestamp, Counter, LSE, LSI, Current time, Real Time Clock
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@par Directory contents
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- RTC/RTC_TimeStamp_Init/Inc/stm32wlxx_it.h Interrupt handlers header file
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- RTC/RTC_TimeStamp_Init/Inc/main.h Header for main.c module
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- RTC/RTC_TimeStamp_Init/Inc/stm32_assert.h Template file to include assert_failed function
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- RTC/RTC_TimeStamp_Init/Src/stm32wlxx_it.c Interrupt handlers
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- RTC/RTC_TimeStamp_Init/Src/main.c Main program
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- RTC/RTC_TimeStamp_Init/Src/system_stm32wlxx.c STM32WLxx system source file
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@par Hardware and Software environment
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- This example runs on STM32WL55JCIx devices.
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- This example has been tested with NUCLEO-WL55JC RevC 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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