Projects/P-NUCLEO-WB55.Nucleo/Examples_LL/EXTI/EXTI_ToggleLedOnIT/readme.txt


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/**
  @page EXTI_ToggleLedOnIT EXTI example
  
  @verbatim
  ******************************************************************************
  * @file    Examples_LL/EXTI/EXTI_ToggleLedOnIT/readme.txt 
  * @author  MCD Application Team
  * @brief   Description of the EXTI example.
  ******************************************************************************
  *
  * Copyright (c) 2019 STMicroelectronics. All rights reserved.
  *
  * This software component is licensed by ST under BSD 3-Clause license,
  * the "License"; You may not use this file except in compliance with the
  * License. You may obtain a copy of the License at:
  *                       opensource.org/licenses/BSD-3-Clause
  *
  ******************************************************************************
  @endverbatim

@par Example Description

How to configure the EXTI and use GPIOs to toggle the user LEDs 
available on the board when a user button is pressed. It is based on the
STM32WBxx LL API. The peripheral initialization uses LL unitary service
functions for optimization purposes (performance and size).

In this example, one EXTI line (External line 4) is configured to generate
an interrupt on each falling edge.

In the interrupt routine a led connected to a specific GPIO pin is toggled.

In this example:
    - External line 4 is connected to PC.04 pin
      - when falling edge is detected on External line 4 by pressing User push-button (SW1), LED2 toggles

On P-NUCLEO-WB55:
    - External line 4 is connected to User push-button (SW1)

@par Keywords

System, GPIO, Output, Alternate function, EXTI, Toggle


@par Directory contents 

  - EXTI/EXTI_ToggleLedOnIT/Inc/stm32wbxx_it.h          Interrupt handlers header file
  - EXTI/EXTI_ToggleLedOnIT/Inc/main.h                  Header for main.c module
  - EXTI/EXTI_ToggleLedOnIT/Inc/stm32_assert.h          Template file to include assert_failed function
  - EXTI/EXTI_ToggleLedOnIT/Src/stm32wbxx_it.c          Interrupt handlers
  - EXTI/EXTI_ToggleLedOnIT/Src/main.c                  Main program
  - EXTI/EXTI_ToggleLedOnIT/Src/system_stm32wbxx.c      STM32WBxx system source file

@par Hardware and Software environment

  - This example runs on STM32WB55xx devices.
    
  - This example has been tested with P-NUCLEO-WB55 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

 * <h3><center>&copy; COPYRIGHT STMicroelectronics</center></h3>
 */