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74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/**
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* @file button.c
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* @brief Implementation of the push-button GPIO input driver with debounce
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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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#include "button.h"
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#include "pico/stdlib.h"
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#include "hardware/gpio.h"
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static uint32_t debounce_delay_ms = 20;
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/**
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* @brief Confirm a raw active-low pin read by waiting for the debounce period
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*
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* After an initial low reading on the pin, this helper re-samples the pin
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* after debounce_delay_ms milliseconds to confirm the reading is stable.
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* This eliminates false triggers caused by mechanical contact bounce.
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*
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* @param pin GPIO pin number to re-sample
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* @return bool true if the pin is still low after the debounce delay
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*/
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static bool _debounce_confirm(uint32_t pin) {
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sleep_ms(debounce_delay_ms);
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return !gpio_get(pin);
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}
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void button_init(uint32_t pin, uint32_t debounce_ms) {
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debounce_delay_ms = debounce_ms;
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gpio_init(pin);
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gpio_set_dir(pin, GPIO_IN);
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gpio_pull_up(pin);
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}
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bool button_is_pressed(uint32_t pin) {
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if (!gpio_get(pin)) {
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return _debounce_confirm(pin);
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}
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return false;
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}
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void button_led_init(uint32_t pin) {
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gpio_init(pin);
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gpio_set_dir(pin, GPIO_OUT);
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gpio_put(pin, false);
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}
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void button_led_set(uint32_t pin, bool on) {
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gpio_put(pin, on);
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}
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