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BusOut.h
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 #ifndef MBED_BUSOUT_H 00017 #define MBED_BUSOUT_H 00018 00019 #include "DigitalOut.h" 00020 00021 namespace mbed { 00022 00023 /** A digital output bus, used for setting the state of a collection of pins 00024 */ 00025 class BusOut { 00026 00027 public: 00028 00029 /** Create an BusOut, connected to the specified pins 00030 * 00031 * @param p<n> DigitalOut pin to connect to bus bit <n> (p5-p30, NC) 00032 * 00033 * @note 00034 * It is only required to specify as many pin variables as is required 00035 * for the bus; the rest will default to NC (not connected) 00036 */ 00037 BusOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC, 00038 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC, 00039 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC, 00040 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC); 00041 00042 BusOut(PinName pins[16]); 00043 00044 virtual ~BusOut(); 00045 00046 /** Write the value to the output bus 00047 * 00048 * @param value An integer specifying a bit to write for every corresponding DigitalOut pin 00049 */ 00050 void write(int value); 00051 00052 /** Read the value currently output on the bus 00053 * 00054 * @returns 00055 * An integer with each bit corresponding to associated DigitalOut pin setting 00056 */ 00057 int read(); 00058 00059 #ifdef MBED_OPERATORS 00060 /** A shorthand for write() 00061 */ 00062 BusOut& operator= (int v); 00063 BusOut& operator= (BusOut& rhs); 00064 00065 /** A shorthand for read() 00066 */ 00067 operator int(); 00068 #endif 00069 00070 protected: 00071 DigitalOut* _pin[16]; 00072 00073 /* disallow copy constructor and assignment operators */ 00074 private: 00075 BusOut(const BusOut&); 00076 BusOut & operator = (const BusOut&); 00077 }; 00078 00079 } // namespace mbed 00080 00081 #endif
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