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 pFunctionPointer_t InterruptIn::rise(void (*fptr)(void)) {
00040     pFunctionPointer_t pf = NULL;
00041     _rise.clear();
00042     if (fptr) {
00043         pf = _rise.add(fptr);
00044         gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
00045     } else {
00046         gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
00047     }
00048     return pf;
00049 }
00050 
00051 pFunctionPointer_t InterruptIn::rise_add_common(void (*fptr)(void), bool front) {
00052     if (NULL == fptr)
00053         return NULL;
00054     pFunctionPointer_t pf = front ? _rise.add_front(fptr) : _rise.add(fptr);
00055     gpio_irq_set(&gpio_irq, IRQ_RISE, 1);
00056     return pf;
00057 }
00058 
00059 bool InterruptIn::rise_remove(pFunctionPointer_t pf) {
00060     bool res = _rise.remove(pf);
00061     if (res && _rise.size() == 0)
00062         gpio_irq_set(&gpio_irq, IRQ_RISE, 0);
00063     return res;
00064 }
00065 
00066 pFunctionPointer_t InterruptIn::fall(void (*fptr)(void)) {
00067     pFunctionPointer_t pf = NULL;
00068     _fall.clear();
00069     if (fptr) {
00070         pf = _fall.add(fptr);
00071         gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
00072     } else {
00073         gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
00074     }
00075     return pf;
00076 }
00077 
00078 pFunctionPointer_t InterruptIn::fall_add_common(void (*fptr)(void), bool front) {
00079     if (NULL == fptr)
00080         return NULL;
00081     pFunctionPointer_t pf = front ? _fall.add_front(fptr) : _fall.add(fptr);
00082     gpio_irq_set(&gpio_irq, IRQ_FALL, 1);
00083     return pf;
00084 }
00085 
00086 bool InterruptIn::fall_remove(pFunctionPointer_t pf) {
00087     bool res = _fall.remove(pf);
00088     if (res && _fall.size() == 0)
00089         gpio_irq_set(&gpio_irq, IRQ_FALL, 0);
00090     return res;
00091 }
00092 
00093 void InterruptIn::_irq_handler(uint32_t id, gpio_irq_event event) {
00094     InterruptIn *handler = (InterruptIn*)id;
00095     switch (event) {
00096         case IRQ_RISE: handler->_rise.call(); break;
00097         case IRQ_FALL: handler->_fall.call(); break;
00098         case IRQ_NONE: break;
00099     }
00100 }
00101 
00102 #ifdef MBED_OPERATORS
00103 InterruptIn::operator int() {
00104     return read();
00105 }
00106 #endif
00107 
00108 } // namespace mbed
00109 
00110 #endif