BusInOut.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/BusInOut.h"
00017 #include "platform/mbed_assert.h"
00018 
00019 namespace mbed {
00020 
00021 BusInOut::BusInOut(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 DigitalInOut(pins[i]) : 0;
00028         if (pins[i] != NC) {
00029             _nc_mask |= (1 << i);
00030         }
00031     }
00032 }
00033 
00034 BusInOut::BusInOut(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 DigitalInOut(pins[i]) : 0;
00039         if (pins[i] != NC) {
00040             _nc_mask |= (1 << i);
00041         }
00042     }
00043 }
00044 
00045 BusInOut::~BusInOut() {
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 void BusInOut::write(int value) {
00055     lock();
00056     for (int i=0; i<16; i++) {
00057         if (_pin[i] != 0) {
00058             _pin[i]->write((value >> i) & 1);
00059         }
00060     }
00061     unlock();
00062 }
00063 
00064 int BusInOut::read() {
00065     lock();
00066     int v = 0;
00067     for (int i=0; i<16; i++) {
00068         if (_pin[i] != 0) {
00069             v |= _pin[i]->read() << i;
00070         }
00071     }
00072     unlock();
00073     return v;
00074 }
00075 
00076 void BusInOut::output() {
00077     lock();
00078     for (int i=0; i<16; i++) {
00079         if (_pin[i] != 0) {
00080             _pin[i]->output();
00081         }
00082     }
00083     unlock();
00084 }
00085 
00086 void BusInOut::input() {
00087     lock();
00088     for (int i=0; i<16; i++) {
00089         if (_pin[i] != 0) {
00090             _pin[i]->input();
00091         }
00092     }
00093     unlock();
00094 }
00095 
00096 void BusInOut::mode(PinMode pull) {
00097     lock();
00098     for (int i=0; i<16; i++) {
00099         if (_pin[i] != 0) {
00100             _pin[i]->mode(pull);
00101         }
00102     }
00103     unlock();
00104 }
00105 
00106 BusInOut& BusInOut::operator= (int v) {
00107     // Underlying write is thread safe
00108     write(v);
00109     return *this;
00110 }
00111 
00112 BusInOut& BusInOut::operator= (BusInOut& rhs) {
00113     // Underlying read is thread safe
00114     write(rhs.read());
00115     return *this;
00116 }
00117 
00118 DigitalInOut& BusInOut::operator[] (int index) {
00119     // No lock needed since _pin is not modified outside the constructor
00120     MBED_ASSERT(index >= 0 && index <= 16);
00121     MBED_ASSERT(_pin[index]);
00122     return *_pin[index];
00123 }
00124 
00125 BusInOut::operator int() {
00126     // Underlying read is thread safe
00127     return read();
00128 }
00129 
00130 void BusInOut::lock() {
00131     _mutex.lock();
00132 }
00133 
00134 void BusInOut::unlock() {
00135     _mutex.unlock();
00136 }
00137 
00138 } // namespace mbed