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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
*
* 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 "libmaple_types.h"
#include "nvic.h"
/**
* @file ext_interrupts.h
*
* @brief Wiring-like external interrupt prototypes and types.
*/
#ifndef _EXT_INTERRUPTS_H_
#define _EXT_INTERRUPTS_H_
/**
* The kind of transition on an external pin which should trigger an
* interrupt.
*/
typedef enum ExtIntTriggerMode {
RISING, /**< To trigger an interrupt when the pin transitions LOW
to HIGH */
FALLING, /**< To trigger an interrupt when the pin transitions
HIGH to LOW */
CHANGE /**< To trigger an interrupt when the pin transitions from
LOW to HIGH or HIGH to LOW (i.e., when the pin
changes). */
} ExtIntTriggerMode;
/**
* @brief Registers an interrupt handler on a pin.
*
* The interrupt will be triggered on a given transition on the pin,
* as specified by the mode parameter. The handler runs in interrupt
* context. The new handler will replace whatever handler is
* currently registered for the pin, if any.
*
* @param pin Maple pin number
* @param handler Function to run upon external interrupt trigger.
* The handler should take no arguments, and have void return type.
* @param mode Type of transition to trigger on, e.g. falling, rising, etc.
*
* @sideeffect Registers a handler
* @see detachInterrupt()
*/
void attachInterrupt(uint8 pin, voidFuncPtr handler, ExtIntTriggerMode mode);
/**
* @brief Disable any registered external interrupt.
* @param pin Maple pin number
* @sideeffect unregisters external interrupt handler
* @see attachInterrupt()
*/
void detachInterrupt(uint8 pin);
/**
* Re-enable interrupts.
*
* Call this after noInterrupts() to re-enable interrupt handling,
* after you have finished with a timing-critical section of code.
*
* @see noInterrupts()
*/
static inline void interrupts() {
nvic_globalirq_enable();
}
/**
* Disable interrupts.
*
* After calling this function, all user-programmable interrupts will
* be disabled. You can call this function before a timing-critical
* section of code, then call interrupts() to re-enable interrupt
* handling.
*
* @see interrupts()
*/
static inline void noInterrupts() {
nvic_globalirq_disable();
}
#endif
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