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/*
* Copyright 2009, Freie Universitaet Berlin (FUB). All rights reserved.
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @defgroup drivers_gpioint GPIO IRQ Multiplexer
* @ingroup drivers
* @brief Provides an API to implement interrupt handlers on IO pins.
*
* Multiplexer and interrupt handling must be implemented platform specific.
*
* @{
*
* @file
* @brief GPIO IRQ Multiplexer interface
*
* @author Michael Baar <michael.baar@fu-berlin.de>
*/
#ifndef GPIOINT_H_
#define GPIOINT_H_
#include <stdint.h>
#include <stdbool.h>
#ifdef __cplusplus
extern "C" {
#endif
/*
* @brief GPIO IRQ multiplexer flags
*
* @note We rely on the exact values for the edges.
* @note These flags are extended in hal/drivers/device-gpio.h
*
* @{
*/
#define GPIOINT_DISABLE 0x00 /**< disable interrupt */
#define GPIOINT_RISING_EDGE 0x01 /**< interrupt is generated on rising edge */
#define GPIOINT_FALLING_EDGE 0x02 /**< interrupt is generated on falling edge */
#define GPIOINT_DEBOUNCE 0x04 /**< debounce this interrupt */
/** @} */
/**
* @brief GPIO IRQ callback function type
*/
typedef void(*fp_irqcb)(void);
/**
* @brief GPIO IRQ handler setup
* @param[in] port CPU specific port number (starting at 0)
* @param[in] bitmask One or more bits for which to set the handler
* @param[in] flags A combination of #GPIOINT_RISING_EDGE and #GPIOINT_FALLING_EDGE
* @param[in] callback A pointer to a handler function
* @retval true successful
* @retval false failed
*
* To enable interrupt handling for a pin flags and callback must be non-zero. To disable interrupt
* handling flags and callback shall be zero.
*/
bool gpioint_set(int port, uint32_t bitmask, int flags, fp_irqcb callback);
/**
* @brief Initialize the multiplexer
*/
void gpioint_init(void);
#ifdef __cplusplus
}
#endif
/** @} */
#endif /* GPIOINT_H_ */
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