mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-06-05 22:06:39 +02:00
Kevin Thomas
066c69f24b
Public function docstrings belong exclusively in .h headers per coding convention. Only static helper functions and static variables retain docstrings in .c files. Removed 413 duplicate docstrings across 185 files (15 CBM + 15 C SDK projects). All 30 projects rebuild with zero errors.
91 lines
2.4 KiB
C
91 lines
2.4 KiB
C
/**
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******************************************************************************
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* @file main.c
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* @author Kevin Thomas
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* @brief Button demonstration: debounced press mirrors to LED + UART report.
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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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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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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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#define DEBOUNCE_MS 20
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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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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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_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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