EXTI_ToggleLedOnIT_Init Example Description

This example describes how to configure the EXTI and use GPIOs to toggle the user LEDs available on the board when a user button is pressed. This example is based on the STM32C0xx LL API. Peripheral initialization is done using LL initialization function to demonstrate LL init usage.

In this example, one EXTI line (EXTI_Line13) 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:

- EXTI_Line13 is connected to PC.13 pin
  - when falling edge is detected on EXTI_Line13 by pressing User push-button, LED1 toggles

On NUCLEO-C071RB:

- EXTI_Line13 is connected to User push-button

Keywords

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

Directory contents

- EXTI/EXTI_ToggleLedOnIT_Init/Inc/stm32c0xx_it.h          Interrupt handlers header file
- EXTI/EXTI_ToggleLedOnIT_Init/Inc/main.h                  Header for main.c module
- EXTI/EXTI_ToggleLedOnIT_Init/Inc/stm32_assert.h          Template file to include assert_failed function
- EXTI/EXTI_ToggleLedOnIT_Init/Src/stm32c0xx_it.c          Interrupt handlers
- EXTI/EXTI_ToggleLedOnIT_Init/Src/main.c                  Main program
- EXTI/EXTI_ToggleLedOnIT_Init/Src/system_stm32c0xx.c      STM32C0xx system source file

Hardware and Software environment

How to use it ?

In order to make the program work, you must do the following :