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/******************************************************************************
* The MIT License
*
* Copyright (c) 2010 Perry Hung.
* Copyright (c) 2011, 2012 LeafLabs, LLC.
*
* 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 wirish/ext_interrupts.cpp
* @brief Wiring-like interface for external interrupts
*/
#include <wirish/ext_interrupts.h>
#include <libmaple/gpio.h>
#include <libmaple/exti.h>
#include <wirish/boards.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((exti_num)(PIN_MAP[pin].gpio_bit),
gpio_exti_port(PIN_MAP[pin].gpio_device),
handler,
outMode);
}
/**
* @brief Registers an interrupt handler on a pin.
*
* @param pin Pin number
* @param handler Static class member function to run upon external interrupt
* trigger. The handler should take 1 argument and return void
* @param arg Argument that the handler will be passed when it's called. One
* use of this is to pass the specific instance of the class that
* will handle the interrupt.
* @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, void *arg, ExtIntTriggerMode mode) {
if (pin >= BOARD_NR_GPIO_PINS || !handler) {
return;
}
exti_trigger_mode outMode = exti_out_mode(mode);
exti_attach_callback((exti_num)(PIN_MAP[pin].gpio_bit),
gpio_exti_port(PIN_MAP[pin].gpio_device),
handler,
arg,
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((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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