InterruptIn.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  *
00004  * Licensed under the Apache License, Version 2.0 (the "License");
00005  * you may not use this file except in compliance with the License.
00006  * You may obtain a copy of the License at
00007  *
00008  *     http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  * Unless required by applicable law or agreed to in writing, software
00011  * distributed under the License is distributed on an "AS IS" BASIS,
00012  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  * See the License for the specific language governing permissions and
00014  * limitations under the License.
00015  */
00016 #include "InterruptIn.h"
00017 
00018 #if DEVICE_INTERRUPTIN
00019 
00020 namespace mbed {
00021 
00022 InterruptIn::InterruptIn(PinName pin) {
00023     gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
00024     gpio_init(&gpio, pin, PIN_INPUT);
00025 }
00026 
00027 InterruptIn::~InterruptIn() {
00028     gpio_irq_free(&gpio_irq);
00029 }
00030 
00031 int InterruptIn::read() {
00032     return gpio_read(&gpio);
00033 }
00034 
00035 void InterruptIn::mode(PinMode pull) {
00036     gpio_mode(&gpio, pull);
00037 }
00038 
00039 void InterruptIn::rise(void (*fptr)(void)) {
00040     if (fptr) {
00041         _rise.attach(fptr);
00042         gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
00043     } else {
00044         gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
00045     }
00046 }
00047 
00048 void InterruptIn::fall(void (*fptr)(void)) {
00049     if (fptr) {
00050         _fall.attach(fptr);
00051         gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
00052     } else {
00053         gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
00054     }
00055 }
00056 
00057 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
00058     InterruptIn *handler = (InterruptIn*)id;
00059     switch (event) {
00060         case IRQ_RISE: handler->_rise.call(); break;
00061         case IRQ_FALL: handler->_fall.call(); break;
00062         case IRQ_NONE: break;
00063     }
00064 }
00065 
00066 void InterruptIn::enable_irq() {
00067     gpio_irq_enable(&gpio_irq);
00068 }
00069 
00070 void InterruptIn::disable_irq() {
00071     gpio_irq_disable(&gpio_irq);
00072 }
00073 
00074 #ifdef MBED_OPERATORS
00075 InterruptIn::operator int() {
00076     return read();
00077 }
00078 #endif
00079 
00080 } // namespace mbed
00081 
00082 #endif