mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-06-10 08:13:57 +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
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/**
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******************************************************************************
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* @file rp2350_button.c
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* @author Kevin Thomas
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* @brief Button input driver implementation for RP2350.
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*
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* Configures a GPIO pin as an active-low input with internal
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* pull-up and provides debounced press detection using a
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* busy-wait confirmation delay.
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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_gpio.h"
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#include "rp2350_delay.h"
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static uint32_t debounce_delay_ms = 20;
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/**
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* @brief Re-sample the pin after the debounce delay to confirm press.
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* @param pin GPIO pin number to re-sample
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* @retval 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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{
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delay_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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{
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debounce_delay_ms = debounce_ms;
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gpio_config_input_pullup(pin);
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}
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bool button_is_pressed(uint32_t pin)
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{
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if (!gpio_get(pin))
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return _debounce_confirm(pin);
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return false;
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}
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