stm32f4_button.c File Reference

Portable functions to interact with the button FSM library. All portable functions must be implemented in this file. More...

#include <stdio.h>
#include "port_button.h"
#include "port_system.h"
#include "stm32f4_system.h"
#include "stm32f4_button.h"

Functions
stm32f4_button_hw_t *	_stm32f4_button_get (uint8_t button_id)
	Get the button struct with the given ID. More...
void	port_button_init (uint8_t button_id)
	Configure the HW specifications of a given button. More...
bool	port_button_get_pressed (uint8_t button_id)
	Return the status of the button (pressed or not). More...

Variables
stm32f4_button_hw_t	buttons_arr []
	Array of elements that represents the HW characteristics of the buttons connected to the STM32F4 platform. More...

Detailed Description

Portable functions to interact with the button FSM library. All portable functions must be implemented in this file.

Author

Sistemas Digitales II

Date

2026-01-01

Function Documentation

_stm32f4_button_get()

stm32f4_button_hw_t* _stm32f4_button_get

(

uint8_t

button_id

)

Get the button struct with the given ID.

Parameters

button_id

Button ID.

Returns

Pointer to the button struct.

NULL If the button ID is not valid.

port_button_get_pressed()

bool port_button_get_pressed

(

uint8_t

button_id

)

Return the status of the button (pressed or not).

TODO alumnos:

✅ 1. Return the value of the field flag_pressed. Call the function _stm32f4_button_get() to get the button struct.

Parameters

button_id

Button ID. This index is used to get the correct button status struct.

Returns

true If the button has been pressed

false If the button has not been pressed

port_button_init()

void port_button_init

(

uint8_t

button_id

)

Configure the HW specifications of a given button.

Assuming we are using an STM32F4-based platform, this function must call the following functions:

TODO alumnos: ✅ 1. Retrieve the button configuration struct calling _stm32f4_button_get()
✅ 2. Call function stm32f4_system_gpio_config() with the right arguments to configure the button as input and no pull up neither pull down connection
✅ 3. Call function stm32f4_system_gpio_config_exti() with the right arguments to configure interruption mode in both rising and falling edges, and enable the interrupt request
✅ 4. Call function stm32f4_system_gpio_exti_enable() with the right parameters to enable the interrupt line and set the priority level to 1 and the subpriority level to 0

Parameters

button_id

Button ID. This index is used to select the element of the buttons_arr[] array

Variable Documentation

buttons_arr

stm32f4_button_hw_t buttons_arr[]

Array of elements that represents the HW characteristics of the buttons connected to the STM32F4 platform.

Array of elements that represents the HW characteristics of the buttons.

This is an extern variable that is declared in stm32f4_button.h. It represents an array of hardware buttons.