86 lines
3.9 KiB
Plaintext
86 lines
3.9 KiB
Plaintext
/**
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@page RTC_Tamper RTC Tamper Example
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@verbatim
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******************************************************************************
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* @file RTC/RTC_Tamper/readme.txt
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* @author MCD Application Team
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* @brief Description of the RTC Tamper 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 tamper detection with backup registers erase.
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At the beginning of the main program the HAL_Init() function is called to reset
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all the peripherals, initialize the Flash interface and the systick.
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Then the SystemClock_Config() function is used to configure the system
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clock (SYSCLK) to run at 48 MHz.
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The RTC peripheral configuration is ensured by the MX_RTC_Init() and MX_TAMP_RTC_Init functions.
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HAL_RTC_MspInit()function which core is implementing the configuration of the needed RTC resources
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according to the used hardware (CLOCK,PWR, RTC clock source and BackUp).
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You may update this function to change RTC configuration.
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@note LSE oscillator clock is used as RTC clock source (32.768 kHz) by default.
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This example performs the following:
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1. Connect a wire between Tamper 1 pin PC.13 (CN7, pin 23) and GND.
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2. Run the software. It configures the Tamper 1 pin and enables the Tamper 1 interrupt.
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3. Software writes a data to a RTC Backup register, checks if the data are correctly written and waits for a Tamper 1 interrupt.
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4. To generate a tamper detection (rising edge), please move the wire from GND to 3.3V.
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5. The RTC backup register is reset and the Tamper interrupt is generated.
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The firmware then checks if the RTC Backup register is cleared.
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6. LED2 turns ON, Test is OK.
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LED2 blinks, Test is KO.
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@note Care must be taken when using HAL_Delay(), this function provides accurate delay (in milliseconds)
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based on variable incremented in SysTick ISR. This implies that if HAL_Delay() is called from
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a peripheral ISR process, then the SysTick interrupt must have higher priority (numerically lower)
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than the peripheral interrupt. Otherwise the caller ISR process will be blocked.
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To change the SysTick interrupt priority you have to use HAL_NVIC_SetPriority() function.
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@note The application need to ensure that the SysTick time base is always set to 1 millisecond
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to have correct HAL operation.
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@par Keywords
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System, RTC, Tamper, Reset, LSE, Backup
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@par Directory contents
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- RTC/RTC_Tamper/Inc/stm32wlxx_nucleo_conf.h BSP configuration file
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- RTC/RTC_Tamper/Inc/stm32wlxx_hal_conf.h HAL configuration file
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- RTC/RTC_Tamper/Inc/stm32wlxx_it.h Interrupt handlers header file
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- RTC/RTC_Tamper/Inc/main.h Header for main.c module
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- RTC/RTC_Tamper/Src/stm32wlxx_it.c Interrupt handlers
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- RTC/RTC_Tamper/Src/main.c Main program
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- RTC/RTC_Tamper/Src/stm32wlxx_hal_msp.c HAL MSP module
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- RTC/RTC_Tamper/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 STMicroelectronics NUCLEO-WL55JC RevC
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board and can be easily tailored to any other supported device
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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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