mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-18 14:04:48 +02:00
Kevin Thomas
afdc1fa594
- GPIO15 active-low button input with internal pull-up - 20ms software debounce via busy-wait confirmation - LED mirrors button state, UART reports edge transitions - New gpio_config_input_pullup() in GPIO driver - 1555B FLASH, 13 source files, zero warnings
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/**
|
|
******************************************************************************
|
|
* @file main.c
|
|
* @author Kevin Thomas
|
|
* @brief Button demonstration: debounced press mirrors to LED + UART report.
|
|
*
|
|
* Demonstrates GPIO input using the button driver. 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)
|
|
*
|
|
******************************************************************************
|
|
* @attention
|
|
*
|
|
* Copyright (c) 2026 Kevin Thomas.
|
|
* All rights reserved.
|
|
*
|
|
* This software is licensed under terms that can be found in the LICENSE file
|
|
* in the root directory of this software component.
|
|
* If no LICENSE file comes with this software, it is provided AS-IS.
|
|
*
|
|
******************************************************************************
|
|
*/
|
|
|
|
#include "rp2350_button.h"
|
|
#include "rp2350_led.h"
|
|
#include "rp2350_uart.h"
|
|
#include "rp2350_delay.h"
|
|
|
|
#define DEBOUNCE_MS 20
|
|
#define POLL_DELAY_MS 10
|
|
|
|
/**
|
|
* @brief Drive the LED to match the current button state.
|
|
* @param pressed true if button is pressed, false if released
|
|
* @retval None
|
|
*/
|
|
static void _set_led_state(bool pressed)
|
|
{
|
|
if (pressed)
|
|
led_on(LED_PIN);
|
|
else
|
|
led_off(LED_PIN);
|
|
}
|
|
|
|
/**
|
|
* @brief Report a button edge transition over UART.
|
|
* @param pressed current button state
|
|
* @param last_state pointer to the stored previous button state
|
|
* @retval None
|
|
*/
|
|
static void _report_edge(bool pressed, bool *last_state)
|
|
{
|
|
if (pressed != *last_state) {
|
|
if (pressed)
|
|
uart_puts("Button: PRESSED\r\n");
|
|
else
|
|
uart_puts("Button: RELEASED\r\n");
|
|
*last_state = pressed;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief Poll the button, mirror to LED, and report edges.
|
|
* @param last_state pointer to the stored previous button state
|
|
* @retval None
|
|
*/
|
|
static void _poll_button(bool *last_state)
|
|
{
|
|
bool pressed;
|
|
pressed = button_is_pressed(BUTTON_PIN);
|
|
_set_led_state(pressed);
|
|
_report_edge(pressed, last_state);
|
|
}
|
|
|
|
/**
|
|
* @brief Application entry point for the button debounce demo.
|
|
* @retval int does not return
|
|
*/
|
|
int main(void)
|
|
{
|
|
button_init(BUTTON_PIN, DEBOUNCE_MS);
|
|
led_init(LED_PIN);
|
|
uart_puts("Button driver initialized: button=GPIO15 led=GPIO25\r\n");
|
|
bool last_state = false;
|
|
while (1) {
|
|
_poll_button(&last_state);
|
|
delay_ms(POLL_DELAY_MS);
|
|
}
|
|
}
|