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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.
* ****************************************************************************/
/**
* @file ext_interrupts.c
*
* @brief Wiring-like interface for external interrupts
*/
#include "wirish.h"
#include "exti.h"
#include "ext_interrupts.h"
/**
* @brief Attach an interrupt handler to be triggered on a given
* transition on the pin. Runs in interrupt context
*
* @param[in] pin Maple pin number
* @param[in] handler Function to run upon external interrupt trigger.
* @param[in] mode Type of transition to trigger on, eg falling, rising, etc.
*
* @sideeffect Registers a handler
*/
int attachInterrupt(uint8 pin, voidFuncPtr handler, uint32 mode) {
uint8 outMode;
/* Parameter checking */
if (pin >= NR_GPIO_PINS) {
return EXT_INTERRUPT_INVALID_PIN;
}
if (!handler) {
ASSERT(0);
return EXT_INTERRUPT_INVALID_FUNCTION;
}
switch (mode) {
case RISING:
outMode = EXTI_RISING;
break;
case FALLING:
outMode = EXTI_FALLING;
break;
case CHANGE:
outMode = EXTI_RISING_FALLING;
break;
default:
ASSERT(0);
return EXT_INTERRUPT_INVALID_MODE;;
}
exti_attach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel,
PIN_TO_EXTI_CHANNEL[pin].port,
handler, mode);
return 0;
}
int detachInterrupt(uint8 pin) {
if (!(pin < NR_GPIO_PINS)) {
return EXT_INTERRUPT_INVALID_PIN;
}
exti_detach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel);
}
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