95 lines
3.9 KiB
Plaintext
95 lines
3.9 KiB
Plaintext
/**
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@page IWDG_WindowMode IWDG Reset with window mode
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@verbatim
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********************* COPYRIGHT(c) 2016 STMicroelectronics *******************
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* @file IWDG/IWDG_WindowMode/readme.txt
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* @author MCD Application Team
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* @brief Description of the IWDG Reset with window mode.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2016 STMicroelectronics.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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@endverbatim
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@par Example Description
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How to periodically update the IWDG reload counter and simulate a software fault that generates
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an MCU IWDG reset after a preset laps of time.
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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 IWDG time-out is set to 762 ms (the time-out may varies due to LSI frequency
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dispersion).
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The Window option is enabled with a window register value set to 400 ms.
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To prevent a reset, the down-counter must be reloaded when its value is:
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-lower than the window register value (400ms)
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-greater than 0x0
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The IWDG counter is therefore refreshed each 450 ms in the main program infinite loop to
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prevent a IWDG reset (762 - 450 = 312 within the interval).
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LED2 is also toggled each 450 ms indicating that the program is running.
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LED2 will turn off if any error occurs.
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An EXTI Line is connected to a GPIO pin, configured to generate an interrupt
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when the User push-button (PC.13) is pressed.
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Once the EXTI Line event occurs by pressing the User push-button (PC.13),
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the refresh period is set to 200 ms.
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That will make refresh being outside window value. As a result, when the IWDG counter is reloaded,
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the IWDG reset occurs.
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If the IWDG reset is generated, after the system resumes from reset, LED2 turns on for 4 seconds.
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If the EXTI Line event does not occur, the IWDG counter is indefinitely refreshed
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in the main program infinite loop, and there is no IWDG reset.
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@note Care must be taken when using HAL_Delay(), this function provides accurate
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delay (in milliseconds) based on variable incremented in SysTick ISR. This
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implies that if HAL_Delay() is called from a peripheral ISR process, then
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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 Directory contents
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- IWDG/IWDG_WindowMode/Inc/stm32f0xx_hal_conf.h HAL configuration file
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- IWDG/IWDG_WindowMode/Inc/stm32f0xx_it.h Interrupt handlers header file
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- IWDG/IWDG_WindowMode/Inc/main.h Header for main.c module
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- IWDG/IWDG_WindowMode/Src/stm32f0xx_it.c Interrupt handlers
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- IWDG/IWDG_WindowMode/Src/main.c Main program
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- IWDG/IWDG_WindowMode/Src/system_stm32f0xx.c STM32F0xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F0xx devices.
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- This example has been tested with STM32F072RB-Nucleo 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: Project->Rebuild all
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- Load project image: Project->Download and Debug
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- Run program: Debug->Go(F5)
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*/
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