Maxim mbed development library
Dependents: MAX34417_demo MAXREFDES1265 MAXREFDES1265
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BusOut.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/BusOut.h" 00017 #include "platform/mbed_assert.h" 00018 00019 namespace mbed { 00020 00021 BusOut::BusOut(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 DigitalOut(pins[i]) : 0; 00028 if (pins[i] != NC) { 00029 _nc_mask |= (1 << i); 00030 } 00031 } 00032 } 00033 00034 BusOut::BusOut(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 DigitalOut(pins[i]) : 0; 00039 if (pins[i] != NC) { 00040 _nc_mask |= (1 << i); 00041 } 00042 } 00043 } 00044 00045 BusOut::~BusOut() { 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 BusOut::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 BusOut::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 BusOut& BusOut::operator= (int v) { 00077 // Underlying write is thread safe 00078 write(v); 00079 return *this; 00080 } 00081 00082 BusOut& BusOut::operator= (BusOut& rhs) { 00083 // Underlying write is thread safe 00084 write(rhs.read()); 00085 return *this; 00086 } 00087 00088 DigitalOut& BusOut::operator[] (int index) { 00089 // No lock needed since _pin is not modified outside the constructor 00090 MBED_ASSERT(index >= 0 && index <= 16); 00091 MBED_ASSERT(_pin[index]); 00092 return *_pin[index]; 00093 } 00094 00095 BusOut::operator int() { 00096 // Underlying read is thread safe 00097 return read(); 00098 } 00099 00100 void BusOut::lock() { 00101 _mutex.lock(); 00102 } 00103 00104 void BusOut::unlock() { 00105 _mutex.unlock(); 00106 } 00107 00108 } // namespace mbed
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