/*
* buttons.c
*
* Copyright (c) 2024 Thomas Buck (thomas@xythobuz.de)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* See .
*/
#include
#include "pico/stdlib.h"
#include "buttons.h"
#define DEBOUNCE_DELAY_MS 50
static const uint gpio_num[NUM_BTNS] = {
5, // BTN_A
6, // BTN_B
7, // BTN_C
8, // BTN_REC
11, // BTN_CLICK
};
struct button_state {
uint32_t last_time;
bool current_state, last_state;
};
static struct button_state buttons[NUM_BTNS];
static void (*callback)(enum buttons, bool) = NULL;
void buttons_init(void) {
for (uint i = 0; i < NUM_BTNS; i++) {
gpio_init(gpio_num[i]);
gpio_set_dir(gpio_num[i], GPIO_IN);
gpio_pull_up(gpio_num[i]);
buttons[i].last_time = 0;
buttons[i].current_state = false;
buttons[i].last_state = false;
}
}
void buttons_callback(void (*fp)(enum buttons, bool)) {
callback = fp;
}
void buttons_run(void) {
for (uint i = 0; i < NUM_BTNS; i++) {
bool state = !gpio_get(gpio_num[i]);
uint32_t now = to_ms_since_boot(get_absolute_time());
if (state != buttons[i].last_state) {
buttons[i].last_time = now;
}
if ((now - buttons[i].last_time) > DEBOUNCE_DELAY_MS) {
if (state != buttons[i].current_state) {
printf("btn %d now %s\n", i, state ? "pressed" : "released");
buttons[i].current_state = state;
if (callback) {
callback(i, state);
}
}
}
buttons[i].last_state = state;
}
}