mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-16 21:23:33 +02:00
Kevin Thomas
104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
/**
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* @file main.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 2026
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*
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* Demonstrates GPIO input using the button driver. The onboard
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* 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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* MIT License
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*
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* Copyright (c) 2026 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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#include "rp2350_button.h"
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#include "rp2350_led.h"
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#include "rp2350_uart.h"
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#include "rp2350_delay.h"
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/** @brief Button debounce window in milliseconds */
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#define DEBOUNCE_MS 20
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/** @brief Button polling interval in milliseconds */
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#define POLL_DELAY_MS 10
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/**
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* @brief Drive the LED to match the current button state.
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* @param pressed true if button is pressed, false if released
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* @retval None
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*/
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static void set_led_state(bool pressed)
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{
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if (pressed)
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led_on(LED_PIN);
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else
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led_off(LED_PIN);
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}
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/**
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* @brief Report a button edge transition over UART.
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* @param pressed current button state
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* @param last_state pointer to the stored previous button state
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* @retval None
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*/
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static void report_edge(bool pressed, bool *last_state)
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{
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if (pressed != *last_state)
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{
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if (pressed)
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uart_puts("Button: PRESSED\r\n");
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else
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uart_puts("Button: RELEASED\r\n");
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*last_state = pressed;
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}
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}
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/**
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* @brief Poll the button, mirror to LED, and report edges.
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* @param last_state pointer to the stored previous button state
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* @retval None
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*/
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static void poll_button(bool *last_state)
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{
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bool pressed;
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pressed = button_is_pressed(BUTTON_PIN);
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set_led_state(pressed);
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report_edge(pressed, last_state);
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}
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int main(void)
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{
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button_init(BUTTON_PIN, DEBOUNCE_MS);
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led_init(LED_PIN);
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uart_puts("Button driver initialized: button=GPIO15 led=GPIO25\r\n");
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bool last_state = false;
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while (1)
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{
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poll_button(&last_state);
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delay_ms(POLL_DELAY_MS);
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}
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}
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