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