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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 { 00023 PinName pins[16] = {p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15}; 00024 00025 // No lock needed in the constructor 00026 _nc_mask = 0; 00027 for (int i = 0; i < 16; i++) { 00028 _pin[i] = (pins[i] != NC) ? new DigitalInOut(pins[i]) : 0; 00029 if (pins[i] != NC) { 00030 _nc_mask |= (1 << i); 00031 } 00032 } 00033 } 00034 00035 BusInOut::BusInOut(PinName pins[16]) 00036 { 00037 // No lock needed in the constructor 00038 _nc_mask = 0; 00039 for (int i = 0; i < 16; i++) { 00040 _pin[i] = (pins[i] != NC) ? new DigitalInOut(pins[i]) : 0; 00041 if (pins[i] != NC) { 00042 _nc_mask |= (1 << i); 00043 } 00044 } 00045 } 00046 00047 BusInOut::~BusInOut() 00048 { 00049 // No lock needed in the destructor 00050 for (int i = 0; i < 16; i++) { 00051 if (_pin[i] != 0) { 00052 delete _pin[i]; 00053 } 00054 } 00055 } 00056 00057 void BusInOut::write(int value) 00058 { 00059 lock(); 00060 for (int i = 0; i < 16; i++) { 00061 if (_pin[i] != 0) { 00062 _pin[i]->write((value >> i) & 1); 00063 } 00064 } 00065 unlock(); 00066 } 00067 00068 int BusInOut::read() 00069 { 00070 lock(); 00071 int v = 0; 00072 for (int i = 0; i < 16; i++) { 00073 if (_pin[i] != 0) { 00074 v |= _pin[i]->read() << i; 00075 } 00076 } 00077 unlock(); 00078 return v; 00079 } 00080 00081 void BusInOut::output() 00082 { 00083 lock(); 00084 for (int i = 0; i < 16; i++) { 00085 if (_pin[i] != 0) { 00086 _pin[i]->output(); 00087 } 00088 } 00089 unlock(); 00090 } 00091 00092 void BusInOut::input() 00093 { 00094 lock(); 00095 for (int i = 0; i < 16; i++) { 00096 if (_pin[i] != 0) { 00097 _pin[i]->input(); 00098 } 00099 } 00100 unlock(); 00101 } 00102 00103 void BusInOut::mode(PinMode pull) 00104 { 00105 lock(); 00106 for (int i = 0; i < 16; i++) { 00107 if (_pin[i] != 0) { 00108 _pin[i]->mode(pull); 00109 } 00110 } 00111 unlock(); 00112 } 00113 00114 BusInOut &BusInOut::operator= (int v) 00115 { 00116 // Underlying write is thread safe 00117 write(v); 00118 return *this; 00119 } 00120 00121 BusInOut &BusInOut::operator= (BusInOut &rhs) 00122 { 00123 // Underlying read is thread safe 00124 write(rhs.read()); 00125 return *this; 00126 } 00127 00128 DigitalInOut &BusInOut::operator[](int index) 00129 { 00130 // No lock needed since _pin is not modified outside the constructor 00131 MBED_ASSERT(index >= 0 && index <= 16); 00132 MBED_ASSERT(_pin[index]); 00133 return *_pin[index]; 00134 } 00135 00136 BusInOut::operator int() 00137 { 00138 // Underlying read is thread safe 00139 return read(); 00140 } 00141 00142 void BusInOut::lock() 00143 { 00144 _mutex.lock(); 00145 } 00146 00147 void BusInOut::unlock() 00148 { 00149 _mutex.unlock(); 00150 } 00151 00152 } // namespace mbed
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