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 static int button_buf[5] = {0};
00021 static int inc = 0;
00022 
00023 namespace mbed {
00024 
00025 InterruptIn::InterruptIn(PinName pin) : gpio(),
00026                                         gpio_irq(),
00027                                         _rise(),
00028                                         _fall() {
00029     gpio_irq_init(&gpio_irq, pin, (&InterruptIn::_irq_handler), (uint32_t)this);
00030     gpio_init_in(&gpio, pin);
00031 }
00032 
00033 InterruptIn::~InterruptIn() {
00034     gpio_irq_free(&gpio_irq);
00035 }
00036 
00037 int InterruptIn::read() {
00038     return gpio_read(&gpio);
00039 }
00040 
00041 void InterruptIn::mode(PinMode pull) {
00042     gpio_mode(&gpio, pull);
00043 }
00044 
00045 void InterruptIn::rise(void (*fptr)(void)) {
00046     if (fptr) {
00047         _rise.attach(fptr);
00048         gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
00049     } else {
00050         gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
00051     }
00052 }
00053 
00054 void InterruptIn::fall(void (*fptr)(void)) {
00055     if (fptr) {
00056         _fall.attach(fptr);
00057         gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
00058     } else {
00059         gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
00060     }
00061 }
00062 
00063 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
00064     InterruptIn *handler = (InterruptIn*)id;
00065     switch (event) {
00066         case IRQ_RISE: handler->_rise.call(); break;
00067         case IRQ_FALL: handler->_fall.call(); break;
00068         case IRQ_NONE: break;
00069     }
00070 }
00071 
00072 void InterruptIn::enable_irq() {
00073     gpio_irq_enable(&gpio_irq);
00074 }
00075 
00076 void InterruptIn::disable_irq() {
00077     gpio_irq_disable(&gpio_irq);
00078 }
00079 
00080 #ifdef MBED_OPERATORS
00081 InterruptIn::operator int() {
00082     
00083     button_buf[inc++] = read();
00084     if (inc == 5) inc = 0;
00085     if (button_buf[0] == button_buf[1] && 
00086         button_buf[1] == button_buf[2] && 
00087         button_buf[2] == button_buf[3] && 
00088         button_buf[3] == button_buf[4]){
00089     
00090         return button_buf[0];
00091     } else {
00092         return 1;
00093     }
00094 }
00095 #endif
00096 
00097 } // namespace mbed
00098 
00099 #endif