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Show/hide line numbers BusOut.cpp Source File

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 "BusOut.h"
00017 #include "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     _nc_mask = 0;
00025     for (int i=0; i<16; i++) {
00026         _pin[i] = (pins[i] != NC) ? new DigitalOut(pins[i]) : 0;
00027         if (pins[i] != NC) {
00028             _nc_mask |= (1 << i);
00029         }
00030     }
00031 }
00032 
00033 BusOut::BusOut(PinName pins[16]) {
00034     _nc_mask = 0;
00035     for (int i=0; i<16; i++) {
00036         _pin[i] = (pins[i] != NC) ? new DigitalOut(pins[i]) : 0;
00037         if (pins[i] != NC) {
00038             _nc_mask |= (1 << i);
00039         }
00040     }
00041 }
00042 
00043 BusOut::~BusOut() {
00044     for (int i=0; i<16; i++) {
00045         if (_pin[i] != 0) {
00046             delete _pin[i];
00047         }
00048     }
00049 }
00050 
00051 void BusOut::write(int value) {
00052     for (int i=0; i<16; i++) {
00053         if (_pin[i] != 0) {
00054             _pin[i]->write((value >> i) & 1);
00055         }
00056     }
00057 }
00058 
00059 int BusOut::read() {
00060     int v = 0;
00061     for (int i=0; i<16; i++) {
00062         if (_pin[i] != 0) {
00063             v |= _pin[i]->read() << i;
00064         }
00065     }
00066     return v;
00067 }
00068 
00069 #ifdef MBED_OPERATORS
00070 BusOut& BusOut::operator= (int v) {
00071     write(v);
00072     return *this;
00073 }
00074 
00075 BusOut& BusOut::operator= (BusOut& rhs) {
00076     write(rhs.read());
00077     return *this;
00078 }
00079 
00080 DigitalOut& BusOut::operator[] (int index) {
00081     MBED_ASSERT(index >= 0 && index <= 16);
00082     MBED_ASSERT(_pin[index]);
00083     return *_pin[index];
00084 }
00085 
00086 BusOut::operator int() {
00087     return read();
00088 }
00089 #endif
00090 
00091 } // namespace mbed