mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-24 00:14:04 +02:00
Kevin Thomas
62 lines
2.0 KiB
C
62 lines
2.0 KiB
C
/**
|
|
* @file rp2350_button.c
|
|
* @brief Button input driver implementation for RP2350.
|
|
* @author Kevin Thomas
|
|
* @date 2026
|
|
*
|
|
* Configures a GPIO pin as an active-low input with internal
|
|
* pull-up and provides debounced press detection using a
|
|
* busy-wait confirmation delay.
|
|
*
|
|
* MIT License
|
|
*
|
|
* Copyright (c) 2026 Kevin Thomas
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in all
|
|
* copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
#include "rp2350_button.h"
|
|
#include "rp2350_gpio.h"
|
|
#include "rp2350_delay.h"
|
|
|
|
static uint32_t debounce_delay_ms = 20;
|
|
|
|
/**
|
|
* @brief Re-sample the pin after the debounce delay to confirm press.
|
|
* @param pin GPIO pin number to re-sample
|
|
* @retval bool true if the pin is still low after the debounce delay
|
|
*/
|
|
static bool debounce_confirm(uint32_t pin)
|
|
{
|
|
delay_ms(debounce_delay_ms);
|
|
return !gpio_get(pin);
|
|
}
|
|
|
|
void button_init(uint32_t pin, uint32_t debounce_ms)
|
|
{
|
|
debounce_delay_ms = debounce_ms;
|
|
gpio_config_input_pullup(pin);
|
|
}
|
|
|
|
bool button_is_pressed(uint32_t pin)
|
|
{
|
|
if (!gpio_get(pin))
|
|
return debounce_confirm(pin);
|
|
return false;
|
|
}
|