74 lines
2.7 KiB
Plaintext
74 lines
2.7 KiB
Plaintext
/**
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@page GPIO_EXTI GPIO EXTI example
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@verbatim
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******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
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* @file GPIO/GPIO_EXTI/readme.txt
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* @author MCD Application Team
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* @brief Description of the GPIO EXTI example.
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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 configure external interrupt lines.
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In this example, one EXTI line (EXTI_Line0) is configured to generate
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an interrupt on each falling edge.
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In the interrupt routine a led connected to a specific GPIO pin is toggled.
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In this example:
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- EXTI_Line0 is connected to PA.00 pin
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- when falling edge is detected on EXTI_Line0 by pressing User push-button, LED3 toggles
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On STM32VL-Discovery:
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- EXTI_Line0 is connected to User push-button
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In this example, HCLK is configured at 24 MHz.
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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 Directory contents
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- GPIO/GPIO_EXTI/Inc/stm32f1xx_hal_conf.h HAL configuration file
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- GPIO/GPIO_EXTI/Inc/stm32f1xx_it.h Interrupt handlers header file
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- GPIO/GPIO_EXTI/Inc/main.h Header for main.c module
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- GPIO/GPIO_EXTI/Src/stm32f1xx_it.c Interrupt handlers
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- GPIO/GPIO_EXTI/Src/main.c Main program
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- GPIO/GPIO_EXTI/Src/system_stm32f1xx.c STM32F1xx system source file
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@par Hardware and Software environment
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- This example runs on STM32F1xx devices.
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- This example has been tested with STM32VL-Discovery 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 and load your image into target memory
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- Run the example
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*/
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