mirror of
https://github.com/STMicroelectronics/STM32CubeF4.git
synced 2025-05-01 22:17:30 +08:00
111 lines
5.1 KiB
Plaintext
111 lines
5.1 KiB
Plaintext
/**
|
|
@page RTC_TimeStamp RTC Time stamp Example
|
|
|
|
@verbatim
|
|
******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
|
|
* @file RTC/RTC_TimeStamp/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief Description of the RTC Time Stamp example.
|
|
******************************************************************************
|
|
*
|
|
* Copyright (c) 2017 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
|
|
|
|
This example guides you through the different configuration steps by mean of HAL API
|
|
to ensure Time Stamp configuration using the RTC peripheral.
|
|
|
|
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 180 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 (CLK,
|
|
PWR, RTC clock source and BackUp). You may update this function to change RTC configuration.
|
|
|
|
LSE oscillator clock is used as RTC clock source. 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
|
|
define on the main.h file.
|
|
|
|
HAL_RTCEx_SetTamper()function is called to initialize the tamper feature.
|
|
HAL_RTCEx_SetTimeStamp_IT()function is then called to initialize the time stamp feature
|
|
with interrupt mode. It configures The Time Stamp pin to be falling edge and enables
|
|
the time Stamp detection on tamper pin.
|
|
HAL_RTC_SetTime()and HAL_RTC_SetDate() functions are then called to initialize the
|
|
time and the date.
|
|
|
|
The program behaves as follows:
|
|
|
|
1. After startup the program configure the RTC (Time date) and enable the feature
|
|
timeStamp. LED1 is on means that the RTC is configured and the time is displayed.
|
|
|
|
2. Applying a low level on the Time Stamp pin (PC13) by pressing to Tamper button,
|
|
a time stamp event is detedced and the calendar is saved in the time stamp structures.
|
|
Each time the user presses on tamper button, LED4 toggles.
|
|
|
|
The time stamp and the current time are displayed on the LCD integrated on the eval board
|
|
if the user uncomment the define USE_LCD in main.h file.
|
|
If the user comment USE_LCD, the current time and Time Stamp are updated and displayed
|
|
on the debugger in aShowTime and aShowTimeStamp variables.
|
|
|
|
LED1 is turned ON when the RTC configuration is done correctly.
|
|
LED4 is turned ON/OFF when the timestamp event is produced.
|
|
LED3 is turned ON in the case of error.
|
|
|
|
@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.
|
|
|
|
@note Care must be taken when HAL_RCCEx_PeriphCLKConfig() is used to select the RTC clock source; in this
|
|
case the Backup domain will be reset in order to modify the RTC Clock source, as consequence RTC
|
|
registers (including the backup registers) and RCC_BDCR register are set to their reset values.
|
|
|
|
|
|
@par Directory contents
|
|
|
|
- RTC/RTC_TimeStamp/Inc/stm32f4xx_hal_conf.h HAL configuration file
|
|
- RTC/RTC_TimeStamp/Inc/stm32f4xx_it.h Interrupt handlers header file
|
|
- RTC/RTC_TimeStamp/Inc/main.h Main program header file
|
|
- RTC/RTC_TimeStamp/Src/stm32f4xx_it.c Interrupt handlers
|
|
- RTC/RTC_TimeStamp/Src/main.c Main program
|
|
- RTC/RTC_TimeStamp/Src/stm32f4xx_hal_msp.c HAL MSP module
|
|
- RTC/RTC_TimeStamp/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
|
|
|
|
@par Keywords
|
|
|
|
RTC, Timer, Timestamp, Counter, LSE, LSI, Current time, Real Time Clock
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32F42xxx/STM32F43xxx devices.
|
|
|
|
- This example has been tested with STM324x9I-EVAL RevB evaluation 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>
|
|
*/
|
|
|