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/* libhw/rp2040_gpioirq.h - Utilities for sharing the GPIO IRQ (IO_IRQ_BANK0)
*
* Copyright (C) 2025 Luke T. Shumaker <lukeshu@lukeshu.com>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#ifndef _LIBHW_RP2040_GPIOIRQ_H_
#define _LIBHW_RP2040_GPIOIRQ_H_
#include <hardware/gpio.h> /* for enum gpio_irq_level */
typedef void (*gpioirq_handler_t)(void *arg, uint gpio, enum gpio_irq_level event);
/**
* Register `fn(arg, ...)` to be called when `event` fires on GPIO pin
* `gpio`.
*
* If multiple events happen close together, the handlers will not
* necessarily be called in-order.
*
* Your handler does not need to acknowledge the IRQ; that will be
* done for you after your handler is called.
*
* It is illegal to call gpioirq_set_and_enable_exclusive_handler()
* on multiple cores.
*
* This is better than the Pico-SDK <hardware/gpio.h> IRQ functions
* because their functions call the handlers for every event, and it
* is up to you to de-mux them in your handler.
*/
void gpioirq_set_and_enable_exclusive_handler(uint gpio, enum gpio_irq_level event, gpioirq_handler_t fn, void *arg);
#endif /* _LIBHW_RP2040_GPIOIRQ_H_ */
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