added prescaler for 16 bit pwm in LPC1347 target
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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 #include "PlatformMutex.h" 00021 00022 namespace mbed { 00023 00024 /** A digital output bus, used for setting the state of a collection of pins 00025 */ 00026 class BusOut { 00027 00028 public: 00029 00030 /** Create an BusOut, connected to the specified pins 00031 * 00032 * @param p<n> DigitalOut pin to connect to bus bit <n> (p5-p30, NC) 00033 * 00034 * @Note Synchronization level: Thread safe 00035 * 00036 * @note 00037 * It is only required to specify as many pin variables as is required 00038 * for the bus; the rest will default to NC (not connected) 00039 */ 00040 BusOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC, 00041 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC, 00042 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC, 00043 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC); 00044 00045 BusOut(PinName pins[16]); 00046 00047 virtual ~BusOut(); 00048 00049 /** Write the value to the output bus 00050 * 00051 * @param value An integer specifying a bit to write for every corresponding DigitalOut pin 00052 */ 00053 void write(int value); 00054 00055 /** Read the value currently output on the bus 00056 * 00057 * @returns 00058 * An integer with each bit corresponding to associated DigitalOut pin setting 00059 */ 00060 int read(); 00061 00062 /** Binary mask of bus pins connected to actual pins (not NC pins) 00063 * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1 00064 * 00065 * @returns 00066 * Binary mask of connected pins 00067 */ 00068 int mask() { 00069 // No lock needed since _nc_mask is not modified outside the constructor 00070 return _nc_mask; 00071 } 00072 00073 /** A shorthand for write() 00074 */ 00075 BusOut& operator= (int v); 00076 BusOut& operator= (BusOut& rhs); 00077 00078 /** Access to particular bit in random-iterator fashion 00079 */ 00080 DigitalOut& operator[] (int index); 00081 00082 /** A shorthand for read() 00083 */ 00084 operator int(); 00085 00086 protected: 00087 virtual void lock(); 00088 virtual void unlock(); 00089 DigitalOut* _pin[16]; 00090 00091 /** Mask of bus's NC pins 00092 * If bit[n] is set to 1 - pin is connected 00093 * if bit[n] is cleared - pin is not connected (NC) 00094 */ 00095 int _nc_mask; 00096 00097 PlatformMutex _mutex; 00098 00099 /* disallow copy constructor and assignment operators */ 00100 private: 00101 BusOut(const BusOut&); 00102 BusOut & operator = (const BusOut&); 00103 }; 00104 00105 } // namespace mbed 00106 00107 #endif
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