97 lines
4.1 KiB
Plaintext
97 lines
4.1 KiB
Plaintext
/**
|
|
@page RTC_Tamper RTC Tamper Example
|
|
|
|
@verbatim
|
|
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
|
|
* @file RTC/RTC_Tamper/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief Description of the RTC Tamper example.
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* Copyright (c) 2016 STMicroelectronics.
|
|
* All rights reserved.
|
|
*
|
|
* This software is licensed under terms that can be found in the LICENSE file
|
|
* in the root directory of this software component.
|
|
* If no LICENSE file comes with this software, it is provided AS-IS.
|
|
*
|
|
******************************************************************************
|
|
@endverbatim
|
|
|
|
@par Example Description
|
|
|
|
Configuration of the RTC HAL API to write/read data to/from RTC Backup registers.
|
|
It also demonstrates the tamper detection feature.
|
|
|
|
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 48 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 LSE oscillator clock is used as RTC clock source by default. 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
|
|
line on the main.h file.
|
|
@code
|
|
#define RTC_CLOCK_SOURCE_LSE
|
|
/* #define RTC_CLOCK_SOURCE_LSI */
|
|
@endcode
|
|
|
|
HAL_RTCEx_SetTamper_IT() function is then called to initialize the Tamper with
|
|
interrupt mode.
|
|
|
|
The associated firmware performs the following:
|
|
1. It configures the Tamper pin to be falling edge, and enables the Tamper
|
|
interrupt.
|
|
2. It writes the data to all RTC Backup data registers, then check whether the
|
|
data were correctly written. If yes, LED2 turns ON, otherwise LED3 turns ON.
|
|
3. Applying a low level on the TAMPER_BUTTON_PIN (PC.13) by pressing Tamper push-button,
|
|
the RTC backup data registers are reset and the Tamper interrupt is generated
|
|
and LED1 turns ON.
|
|
The corresponding ISR then checks whether the RTC Backup data registers are cleared.
|
|
If yes LED4 toggles, otherwise LED3 turns ON.
|
|
|
|
@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 Directory contents
|
|
|
|
- RTC/RTC_Tamper/Inc/stm32f0xx_hal_conf.h HAL configuration file
|
|
- RTC/RTC_Tamper/Inc/stm32f0xx_it.h Interrupt handlers header file
|
|
- RTC/RTC_Tamper/Inc/main.h Header for main.c module
|
|
- RTC/RTC_Tamper/Src/stm32f0xx_it.c Interrupt handlers
|
|
- RTC/RTC_Tamper/Src/main.c Main program
|
|
- RTC/RTC_Tamper/Src/stm32f0xx_hal_msp.c HAL MSP module
|
|
- RTC/RTC_Tamper/Src/system_stm32f0xx.c STM32F0xx system source file
|
|
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32F091VC devices.
|
|
- This example has been tested with STMicroelectronics STM32091C-EVAL
|
|
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
|
|
|
|
|
|
|
|
*/
|