74 lines
2.8 KiB
Plaintext
74 lines
2.8 KiB
Plaintext
/**
|
|
@page GPIO_EXTI GPIO EXTI example
|
|
|
|
@verbatim
|
|
******************** (C) COPYRIGHT 2016 STMicroelectronics *******************
|
|
* @file GPIO/GPIO_EXTI/readme.txt
|
|
* @author MCD Application Team
|
|
* @brief Description of the GPIO EXTI 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
|
|
|
|
How to configure external interrupt lines.
|
|
|
|
In this example, 1 EXTI line (EXTI_Line4_15) is configured to generate
|
|
an interrupt on each rising edge.
|
|
In the interrupt routine a led connected to a specific GPIO pin is toggled.
|
|
|
|
In this example:
|
|
- EXTI_Line4_15 is connected to PC.13 pin
|
|
- when falling edge is detected on EXTI_Line4_15 by pressing User push-button, LED2 toggles
|
|
|
|
On STM32F072RB-Nucleo RevC:
|
|
- EXTI_Line4_15 is connected to User push-button
|
|
|
|
In this example, HCLK is configured at 48 MHz.
|
|
|
|
@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
|
|
|
|
- GPIO/GPIO_EXTI/Inc/stm32f0xx_hal_conf.h HAL configuration file
|
|
- GPIO/GPIO_EXTI/Inc/stm32f0xx_it.h Interrupt handlers header file
|
|
- GPIO/GPIO_EXTI/Inc/main.h Header for main.c module
|
|
- GPIO/GPIO_EXTI/Src/stm32f0xx_it.c Interrupt handlers
|
|
- GPIO/GPIO_EXTI/Src/main.c Main program
|
|
- GPIO/GPIO_EXTI/Src/system_stm32f0xx.c STM32F0xx system source file
|
|
|
|
@par Hardware and Software environment
|
|
|
|
- This example runs on STM32F072RB devices.
|
|
|
|
- This example has been tested with STM32F072RB-Nucleo RevC 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
|
|
|
|
|
|
|
|
*/
|