mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-04-01 09:00:18 +02:00
85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/**
|
|
* @file 0x03_button.c
|
|
* @brief Button demonstration: debounced press mirrors to LED + UART report
|
|
* @author Kevin Thomas
|
|
* @date 2025
|
|
*
|
|
* MIT License
|
|
*
|
|
* Copyright (c) 2025 Kevin Thomas
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*
|
|
* -----------------------------------------------------------------------------
|
|
*
|
|
* Demonstrates GPIO input using the button driver (button.h / button.c).
|
|
* The onboard LED mirrors the button state and every edge transition is
|
|
* reported over UART.
|
|
*
|
|
* Wiring:
|
|
* GPIO15 -> One leg of push button
|
|
* GND -> Other leg of push button
|
|
* GPIO25 -> Onboard LED (no external wiring needed)
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include "pico/stdlib.h"
|
|
#include "button.h"
|
|
|
|
#define BUTTON_PIN 15
|
|
#define LED_PIN 25
|
|
#define DEBOUNCE_MS 20
|
|
|
|
/**
|
|
* @brief Poll button state and report edge transitions over UART
|
|
*
|
|
* Reads the debounced button state, mirrors it to the LED, and prints
|
|
* a message when the state changes from the previous reading.
|
|
*
|
|
* @param last_state Pointer to the stored previous button state
|
|
*/
|
|
static void _poll_button(bool *last_state) {
|
|
bool pressed = button_is_pressed(BUTTON_PIN);
|
|
button_led_set(LED_PIN, pressed);
|
|
if (pressed != *last_state) {
|
|
printf("Button: %s\r\n", pressed ? "PRESSED" : "RELEASED");
|
|
*last_state = pressed;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Application entry point for the button debounce demo
|
|
*
|
|
* Initializes button and LED, then continuously polls button state
|
|
* and mirrors it to the LED with UART reporting on edge transitions.
|
|
*
|
|
* @return int Does not return
|
|
*/
|
|
int main(void) {
|
|
stdio_init_all();
|
|
button_init(BUTTON_PIN, DEBOUNCE_MS);
|
|
button_led_init(LED_PIN);
|
|
printf("Button driver initialized: button=GPIO%d led=GPIO%d\r\n", BUTTON_PIN, LED_PIN);
|
|
bool last_state = false;
|
|
while (true) {
|
|
_poll_button(&last_state);
|
|
sleep_ms(10);
|
|
}
|
|
}
|