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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 "boards.h"
#include "gpio.h"
#include "exti.h"
#include "ext_interrupts.h"
static inline exti_trigger_mode exti_out_mode(ExtIntTriggerMode mode);
/**
* @brief Attach an interrupt handler to a pin, triggering on the given mode.
* @param pin Pin to attach an interrupt handler onto.
* @param handler Function to call when the external interrupt is triggered.
* @param mode Trigger mode for the given interrupt.
* @see ExtIntTriggerMode
*/
void attachInterrupt(uint8 pin, voidFuncPtr handler, ExtIntTriggerMode mode) {
if (pin >= BOARD_NR_GPIO_PINS || !handler) {
return;
}
exti_trigger_mode outMode = exti_out_mode(mode);
exti_attach_interrupt((afio_exti_num)(PIN_MAP[pin].gpio_bit),
gpio_exti_port(PIN_MAP[pin].gpio_device),
handler,
outMode);
}
/**
* @brief Disable any external interrupt attached to a pin.
* @param pin Pin number to detach any interrupt from.
*/
void detachInterrupt(uint8 pin) {
if (pin >= BOARD_NR_GPIO_PINS) {
return;
}
exti_detach_interrupt((afio_exti_num)(PIN_MAP[pin].gpio_bit));
}
static inline exti_trigger_mode exti_out_mode(ExtIntTriggerMode mode) {
switch (mode) {
case RISING:
return EXTI_RISING;
case FALLING:
return EXTI_FALLING;
case CHANGE:
return EXTI_RISING_FALLING;
}
// Can't happen
ASSERT(0);
return (exti_trigger_mode)0;
}
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