Simon Cooksey / mbed-os

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drivers/BusOut.h@0:fb7af294d5d9, 2016-11-17 (annotated)

Committer:
Simon Cooksey
Date:
Thu Nov 17 16:43:53 2016 +0000
Revision:
0:fb7af294d5d9
Initial commit

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Simon Cooksey 0:fb7af294d5d9 1 /* mbed Microcontroller Library
Simon Cooksey 0:fb7af294d5d9 2 * Copyright (c) 2006-2013 ARM Limited
Simon Cooksey 0:fb7af294d5d9 3 *
Simon Cooksey 0:fb7af294d5d9 4 * Licensed under the Apache License, Version 2.0 (the "License");
Simon Cooksey 0:fb7af294d5d9 5 * you may not use this file except in compliance with the License.
Simon Cooksey 0:fb7af294d5d9 6 * You may obtain a copy of the License at
Simon Cooksey 0:fb7af294d5d9 7 *
Simon Cooksey 0:fb7af294d5d9 8 * http://www.apache.org/licenses/LICENSE-2.0
Simon Cooksey 0:fb7af294d5d9 9 *
Simon Cooksey 0:fb7af294d5d9 10 * Unless required by applicable law or agreed to in writing, software
Simon Cooksey 0:fb7af294d5d9 11 * distributed under the License is distributed on an "AS IS" BASIS,
Simon Cooksey 0:fb7af294d5d9 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
Simon Cooksey 0:fb7af294d5d9 13 * See the License for the specific language governing permissions and
Simon Cooksey 0:fb7af294d5d9 14 * limitations under the License.
Simon Cooksey 0:fb7af294d5d9 15 */
Simon Cooksey 0:fb7af294d5d9 16 #ifndef MBED_BUSOUT_H
Simon Cooksey 0:fb7af294d5d9 17 #define MBED_BUSOUT_H
Simon Cooksey 0:fb7af294d5d9 18
Simon Cooksey 0:fb7af294d5d9 19 #include "drivers/DigitalOut.h"
Simon Cooksey 0:fb7af294d5d9 20 #include "platform/PlatformMutex.h"
Simon Cooksey 0:fb7af294d5d9 21
Simon Cooksey 0:fb7af294d5d9 22 namespace mbed {
Simon Cooksey 0:fb7af294d5d9 23 /** \addtogroup drivers */
Simon Cooksey 0:fb7af294d5d9 24 /** @{*/
Simon Cooksey 0:fb7af294d5d9 25
Simon Cooksey 0:fb7af294d5d9 26 /** A digital output bus, used for setting the state of a collection of pins
Simon Cooksey 0:fb7af294d5d9 27 */
Simon Cooksey 0:fb7af294d5d9 28 class BusOut {
Simon Cooksey 0:fb7af294d5d9 29
Simon Cooksey 0:fb7af294d5d9 30 public:
Simon Cooksey 0:fb7af294d5d9 31
Simon Cooksey 0:fb7af294d5d9 32 /** Create an BusOut, connected to the specified pins
Simon Cooksey 0:fb7af294d5d9 33 *
Simon Cooksey 0:fb7af294d5d9 34 * @param p<n> DigitalOut pin to connect to bus bit <n> (p5-p30, NC)
Simon Cooksey 0:fb7af294d5d9 35 *
Simon Cooksey 0:fb7af294d5d9 36 * @Note Synchronization level: Thread safe
Simon Cooksey 0:fb7af294d5d9 37 *
Simon Cooksey 0:fb7af294d5d9 38 * @note
Simon Cooksey 0:fb7af294d5d9 39 * It is only required to specify as many pin variables as is required
Simon Cooksey 0:fb7af294d5d9 40 * for the bus; the rest will default to NC (not connected)
Simon Cooksey 0:fb7af294d5d9 41 */
Simon Cooksey 0:fb7af294d5d9 42 BusOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
Simon Cooksey 0:fb7af294d5d9 43 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
Simon Cooksey 0:fb7af294d5d9 44 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
Simon Cooksey 0:fb7af294d5d9 45 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
Simon Cooksey 0:fb7af294d5d9 46
Simon Cooksey 0:fb7af294d5d9 47 BusOut(PinName pins[16]);
Simon Cooksey 0:fb7af294d5d9 48
Simon Cooksey 0:fb7af294d5d9 49 virtual ~BusOut();
Simon Cooksey 0:fb7af294d5d9 50
Simon Cooksey 0:fb7af294d5d9 51 /** Write the value to the output bus
Simon Cooksey 0:fb7af294d5d9 52 *
Simon Cooksey 0:fb7af294d5d9 53 * @param value An integer specifying a bit to write for every corresponding DigitalOut pin
Simon Cooksey 0:fb7af294d5d9 54 */
Simon Cooksey 0:fb7af294d5d9 55 void write(int value);
Simon Cooksey 0:fb7af294d5d9 56
Simon Cooksey 0:fb7af294d5d9 57 /** Read the value currently output on the bus
Simon Cooksey 0:fb7af294d5d9 58 *
Simon Cooksey 0:fb7af294d5d9 59 * @returns
Simon Cooksey 0:fb7af294d5d9 60 * An integer with each bit corresponding to associated DigitalOut pin setting
Simon Cooksey 0:fb7af294d5d9 61 */
Simon Cooksey 0:fb7af294d5d9 62 int read();
Simon Cooksey 0:fb7af294d5d9 63
Simon Cooksey 0:fb7af294d5d9 64 /** Binary mask of bus pins connected to actual pins (not NC pins)
Simon Cooksey 0:fb7af294d5d9 65 * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
Simon Cooksey 0:fb7af294d5d9 66 *
Simon Cooksey 0:fb7af294d5d9 67 * @returns
Simon Cooksey 0:fb7af294d5d9 68 * Binary mask of connected pins
Simon Cooksey 0:fb7af294d5d9 69 */
Simon Cooksey 0:fb7af294d5d9 70 int mask() {
Simon Cooksey 0:fb7af294d5d9 71 // No lock needed since _nc_mask is not modified outside the constructor
Simon Cooksey 0:fb7af294d5d9 72 return _nc_mask;
Simon Cooksey 0:fb7af294d5d9 73 }
Simon Cooksey 0:fb7af294d5d9 74
Simon Cooksey 0:fb7af294d5d9 75 /** A shorthand for write()
Simon Cooksey 0:fb7af294d5d9 76 */
Simon Cooksey 0:fb7af294d5d9 77 BusOut& operator= (int v);
Simon Cooksey 0:fb7af294d5d9 78 BusOut& operator= (BusOut& rhs);
Simon Cooksey 0:fb7af294d5d9 79
Simon Cooksey 0:fb7af294d5d9 80 /** Access to particular bit in random-iterator fashion
Simon Cooksey 0:fb7af294d5d9 81 */
Simon Cooksey 0:fb7af294d5d9 82 DigitalOut& operator[] (int index);
Simon Cooksey 0:fb7af294d5d9 83
Simon Cooksey 0:fb7af294d5d9 84 /** A shorthand for read()
Simon Cooksey 0:fb7af294d5d9 85 */
Simon Cooksey 0:fb7af294d5d9 86 operator int();
Simon Cooksey 0:fb7af294d5d9 87
Simon Cooksey 0:fb7af294d5d9 88 protected:
Simon Cooksey 0:fb7af294d5d9 89 virtual void lock();
Simon Cooksey 0:fb7af294d5d9 90 virtual void unlock();
Simon Cooksey 0:fb7af294d5d9 91 DigitalOut* _pin[16];
Simon Cooksey 0:fb7af294d5d9 92
Simon Cooksey 0:fb7af294d5d9 93 /** Mask of bus's NC pins
Simon Cooksey 0:fb7af294d5d9 94 * If bit[n] is set to 1 - pin is connected
Simon Cooksey 0:fb7af294d5d9 95 * if bit[n] is cleared - pin is not connected (NC)
Simon Cooksey 0:fb7af294d5d9 96 */
Simon Cooksey 0:fb7af294d5d9 97 int _nc_mask;
Simon Cooksey 0:fb7af294d5d9 98
Simon Cooksey 0:fb7af294d5d9 99 PlatformMutex _mutex;
Simon Cooksey 0:fb7af294d5d9 100
Simon Cooksey 0:fb7af294d5d9 101 /* disallow copy constructor and assignment operators */
Simon Cooksey 0:fb7af294d5d9 102 private:
Simon Cooksey 0:fb7af294d5d9 103 BusOut(const BusOut&);
Simon Cooksey 0:fb7af294d5d9 104 BusOut & operator = (const BusOut&);
Simon Cooksey 0:fb7af294d5d9 105 };
Simon Cooksey 0:fb7af294d5d9 106
Simon Cooksey 0:fb7af294d5d9 107 } // namespace mbed
Simon Cooksey 0:fb7af294d5d9 108
Simon Cooksey 0:fb7af294d5d9 109 #endif
Simon Cooksey 0:fb7af294d5d9 110
Simon Cooksey 0:fb7af294d5d9 111 /** @}*/