BusOut.cpp

00001 /* mbed Microcontroller Library
00002  * Copyright (c) 2006-2013 ARM Limited
00003  * SPDX-License-Identifier: Apache-2.0
00004  *
00005  * Licensed under the Apache License, Version 2.0 (the "License");
00006  * you may not use this file except in compliance with the License.
00007  * You may obtain a copy of the License at
00008  *
00009  *     http://www.apache.org/licenses/LICENSE-2.0
00010  *
00011  * Unless required by applicable law or agreed to in writing, software
00012  * distributed under the License is distributed on an "AS IS" BASIS,
00013  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00014  * See the License for the specific language governing permissions and
00015  * limitations under the License.
00016  */
00017 #include "drivers/BusOut.h"
00018 #include "platform/mbed_assert.h"
00019 
00020 namespace mbed {
00021 
00022 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)
00023 {
00024     PinName pins[16] = {p0, p1, p2, p3, p4, p5, p6, p7, p8, p9, p10, p11, p12, p13, p14, p15};
00025 
00026     // No lock needed in the constructor
00027     _nc_mask = 0;
00028     for (int i = 0; i < 16; i++) {
00029         _pin[i] = (pins[i] != NC) ? new DigitalOut(pins[i]) : 0;
00030         if (pins[i] != NC) {
00031             _nc_mask |= (1 << i);
00032         }
00033     }
00034 }
00035 
00036 BusOut::BusOut(PinName pins[16])
00037 {
00038     // No lock needed in the constructor
00039     _nc_mask = 0;
00040     for (int i = 0; i < 16; i++) {
00041         _pin[i] = (pins[i] != NC) ? new DigitalOut(pins[i]) : 0;
00042         if (pins[i] != NC) {
00043             _nc_mask |= (1 << i);
00044         }
00045     }
00046 }
00047 
00048 BusOut::~BusOut()
00049 {
00050     // No lock needed in the destructor
00051     for (int i = 0; i < 16; i++) {
00052         if (_pin[i] != 0) {
00053             delete _pin[i];
00054         }
00055     }
00056 }
00057 
00058 void BusOut::write(int value)
00059 {
00060     lock();
00061     for (int i = 0; i < 16; i++) {
00062         if (_pin[i] != 0) {
00063             _pin[i]->write((value >> i) & 1);
00064         }
00065     }
00066     unlock();
00067 }
00068 
00069 int BusOut::read()
00070 {
00071     lock();
00072     int v = 0;
00073     for (int i = 0; i < 16; i++) {
00074         if (_pin[i] != 0) {
00075             v |= _pin[i]->read() << i;
00076         }
00077     }
00078     unlock();
00079     return v;
00080 }
00081 
00082 BusOut &BusOut::operator= (int v)
00083 {
00084     // Underlying write is thread safe
00085     write(v);
00086     return *this;
00087 }
00088 
00089 BusOut &BusOut::operator= (BusOut &rhs)
00090 {
00091     // Underlying write is thread safe
00092     write(rhs.read());
00093     return *this;
00094 }
00095 
00096 DigitalOut &BusOut::operator[](int index)
00097 {
00098     // No lock needed since _pin is not modified outside the constructor
00099     MBED_ASSERT(index >= 0 && index < 16);
00100     MBED_ASSERT(_pin[index]);
00101     return *_pin[index];
00102 }
00103 
00104 BusOut::operator int()
00105 {
00106     // Underlying read is thread safe
00107     return read();
00108 }
00109 
00110 void BusOut::lock()
00111 {
00112     _mutex.lock();
00113 }
00114 
00115 void BusOut::unlock()
00116 {
00117     _mutex.unlock();
00118 }
00119 
00120 } // namespace mbed