BusIn.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 "drivers/BusIn.h"
00017 #include "platform/mbed_assert.h"
00018 
00019 namespace mbed {
00020 
00021 BusIn::BusIn(PinName p0, PinName p1, PinName p2, PinName p3, PinName p4, PinName p5, PinName p6, PinName p7, PinName p8, PinName p9, PinName p10, PinName p11, PinName p12, PinName p13, PinName p14, PinName p15) {
00022     PinName pins[16] = {p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15};
00023 
00024     // No lock needed in the constructor
00025     _nc_mask = 0;
00026     for (int i=0; i<16; i++) {
00027         _pin[i] = (pins[i] != NC) ? new DigitalIn(pins[i]) : 0;
00028         if (pins[i] != NC) {
00029             _nc_mask |= (1 << i);
00030         }
00031     }
00032 }
00033 
00034 BusIn::BusIn(PinName pins[16]) {
00035     // No lock needed in the constructor
00036     _nc_mask = 0;
00037     for (int i=0; i<16; i++) {
00038         _pin[i] = (pins[i] != NC) ? new DigitalIn(pins[i]) : 0;
00039         if (pins[i] != NC) {
00040             _nc_mask |= (1 << i);
00041         }
00042     }
00043 }
00044 
00045 BusIn::~BusIn() {
00046     // No lock needed in the destructor
00047     for (int i=0; i<16; i++) {
00048         if (_pin[i] != 0) {
00049             delete _pin[i];
00050         }
00051     }
00052 }
00053 
00054 int BusIn::read() {
00055     int v = 0;
00056     lock();
00057     for (int i=0; i<16; i++) {
00058         if (_pin[i] != 0) {
00059             v |= _pin[i]->read() << i;
00060         }
00061     }
00062     unlock();
00063     return v;
00064 }
00065 
00066 void BusIn::mode(PinMode pull) {
00067     lock();
00068     for (int i=0; i<16; i++) {
00069         if (_pin[i] != 0) {
00070             _pin[i]->mode(pull);
00071         }
00072     }
00073     unlock();
00074 }
00075 
00076 void BusIn::lock() {
00077     _mutex.lock();
00078 }
00079 
00080 void BusIn::unlock() {
00081     _mutex.unlock();
00082 }
00083 
00084 BusIn::operator int() {
00085     // Underlying read is thread safe
00086     return read();
00087 }
00088 
00089 DigitalIn& BusIn::operator[] (int index) {
00090     // No lock needed since _pin is not modified outside the constructor
00091     MBED_ASSERT(index >= 0 && index <= 16);
00092     MBED_ASSERT(_pin[index]);
00093     return *_pin[index];
00094 }
00095 
00096 } // namespace mbed