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mbed-classic/api/InterruptIn.h

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/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MBED_INTERRUPTIN_H
#define MBED_INTERRUPTIN_H
#include "platform.h"
#if DEVICE_INTERRUPTIN
#include "gpio_api.h"
#include "gpio_irq_api.h"
#include "FunctionPointer.h"
namespace mbed {
/** A digital interrupt input, used to call a function on a rising or falling edge
*
* Example:
* @code
* // Flash an LED while waiting for events
*
* #include "mbed.h"
*
* InterruptIn event(p16);
* DigitalOut led(LED1);
*
* void trigger() {
* printf("triggered!\n");
* }
*
* int main() {
* event.rise(&trigger);
* while(1) {
* led = !led;
* wait(0.25);
* }
* }
* @endcode
*/
class InterruptIn {
public:
/** Create an InterruptIn connected to the specified pin
*
* @param pin InterruptIn pin to connect to
* @param name (optional) A string to identify the object
*/
InterruptIn(PinName pin);
virtual ~InterruptIn();
int read();
#ifdef MBED_OPERATORS
operator int();
#endif
/** Attach a function to call when a rising edge occurs on the input
*
* @param fptr A pointer to a void function, or 0 to set as none
*/
void rise(void (*fptr)(void));
/** Attach a member function to call when a rising edge occurs on the input
*
* @param tptr pointer to the object to call the member function on
* @param mptr pointer to the member function to be called
*/
template<typename T>
void rise(T* tptr, void (T::*mptr)(void)) {
_rise.attach(tptr, mptr);
gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
}
/** Attach a function to call when a falling edge occurs on the input
*
* @param fptr A pointer to a void function, or 0 to set as none
*/
void fall(void (*fptr)(void));
/** Attach a member function to call when a falling edge occurs on the input
*
* @param tptr pointer to the object to call the member function on
* @param mptr pointer to the member function to be called
*/
template<typename T>
void fall(T* tptr, void (T::*mptr)(void)) {
_fall.attach(tptr, mptr);
gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
}
/** Set the input pin mode
*
* @param mode PullUp, PullDown, PullNone
*/
void mode(PinMode pull);
/** Enable IRQ. This method depends on hw implementation, might enable one
* port interrupts. For further information, check gpio_irq_enable().
*/
void enable_irq();
/** Disable IRQ. This method depends on hw implementation, might disable one
* port interrupts. For further information, check gpio_irq_disable().
*/
void disable_irq();
static void _irq_handler(uint32_t id, gpio_irq_event event);
protected:
gpio_t gpio;
gpio_irq_t gpio_irq;
FunctionPointer _rise;
FunctionPointer _fall;
};
} // namespace mbed
#endif
#endif