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BusInOut.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_BUSINOUT_H 00017 #define MBED_BUSINOUT_H 00018 00019 #include "DigitalInOut.h" 00020 00021 namespace mbed { 00022 00023 /** A digital input output bus, used for setting the state of a collection of pins 00024 */ 00025 class BusInOut { 00026 00027 public: 00028 00029 /** Create an BusInOut, connected to the specified pins 00030 * 00031 * @param p<n> DigitalInOut pin to connect to bus bit p<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 BusInOut(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 BusInOut(PinName pins[16]); 00043 00044 virtual ~BusInOut(); 00045 00046 /* Group: Access Methods */ 00047 00048 /** Write the value to the output bus 00049 * 00050 * @param value An integer specifying a bit to write for every corresponding DigitalInOut pin 00051 */ 00052 void write(int value); 00053 00054 00055 /** Read the value currently output on the bus 00056 * 00057 * @returns 00058 * An integer with each bit corresponding to associated DigitalInOut pin setting 00059 */ 00060 int read(); 00061 00062 /** Set as an output 00063 */ 00064 void output(); 00065 00066 /** Set as an input 00067 */ 00068 void input(); 00069 00070 /** Set the input pin mode 00071 * 00072 * @param mode PullUp, PullDown, PullNone 00073 */ 00074 void mode(PinMode pull); 00075 00076 #ifdef MBED_OPERATORS 00077 /** A shorthand for write() 00078 */ 00079 BusInOut& operator= (int v); 00080 BusInOut& operator= (BusInOut& rhs); 00081 00082 /** A shorthand for read() 00083 */ 00084 operator int(); 00085 #endif 00086 00087 protected: 00088 DigitalInOut* _pin[16]; 00089 }; 00090 00091 } // namespace mbed 00092 00093 #endif
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