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79 lines
3.2 KiB
Plaintext
79 lines
3.2 KiB
Plaintext
/**
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@page PWR_PVD PWR Programmable Voltage Detector (PVD) example
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@verbatim
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******************** (C) COPYRIGHT 2017 STMicroelectronics *******************
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* @file PWR/PWR_STOP/readme.txt
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* @author MCD Application Team
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* @brief Description of the PWR Programmable Voltage Detector (PVD) example.
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2017 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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This example shows how to configure the programmable voltage detector using
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an external interrupt line. In this example, EXTI line 16 is configured to generate
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an interrupt on each rising or falling edge of the PVD output signal (which
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indicates that the Vdd voltage is below the PVD threshold).
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In the interrupt routine a LED connected to a specific GPIO pin is toggled every
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time the voltage drops below or above the target threshold.
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A LED connected to a specific GPIO pin is toggling to indicate that the system
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is in RUN.
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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 needs 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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Power, PWR, EXTI, PVD, Interrupt, Wakeup, External reset
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@par Directory contents
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- PWR/PWR_PVD/Inc/stm32f4xx_hal_conf.h HAL configuration file
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- PWR/PWR_PVD/Inc/stm32f4xx_it.h Interrupt handlers header file
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- PWR/PWR_PVD/Inc/main.h header file for main.c
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- PWR/PWR_PVD/Src/system_stm32f4xx.c STM32F4xx system clock configuration file
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- PWR/PWR_PVD/Src/stm32f4xx_it.c Interrupt handlers
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- PWR/PWR_PVD/Src/main.c Main program
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- PWR/PWR_PVD/Src/stm32f4xx_hal_msp.c HAL MSP module
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@par Hardware and Software environment
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- This example runs on STM32F429xx/STM32F439xx devices.
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- This example has been tested with STMicroelectronics STM324x9I-EVAL RevB
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evaluation boards and can be easily tailored to any other supported device
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and development board.
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- STM324x9I-EVAL RevB Set-up
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- Use LED1, LED2 and LED3 connected respectively to PG.06, PG.07 and PG.10 pins
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@note This example can't run on the STM324x9I-EVAL 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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*/
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