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drivers/BusOut.h@167:2ee3e82cb6f5, 2017-07-21 (annotated)

Committer:
thedo
Date:
Fri Jul 21 01:26:54 2017 +0000
Revision:
167:2ee3e82cb6f5
gr-peach-opencv-project-sd-card

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thedo 167:2ee3e82cb6f5 1 /* mbed Microcontroller Library
thedo 167:2ee3e82cb6f5 2 * Copyright (c) 2006-2013 ARM Limited
thedo 167:2ee3e82cb6f5 3 *
thedo 167:2ee3e82cb6f5 4 * Licensed under the Apache License, Version 2.0 (the "License");
thedo 167:2ee3e82cb6f5 5 * you may not use this file except in compliance with the License.
thedo 167:2ee3e82cb6f5 6 * You may obtain a copy of the License at
thedo 167:2ee3e82cb6f5 7 *
thedo 167:2ee3e82cb6f5 8 * http://www.apache.org/licenses/LICENSE-2.0
thedo 167:2ee3e82cb6f5 9 *
thedo 167:2ee3e82cb6f5 10 * Unless required by applicable law or agreed to in writing, software
thedo 167:2ee3e82cb6f5 11 * distributed under the License is distributed on an "AS IS" BASIS,
thedo 167:2ee3e82cb6f5 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
thedo 167:2ee3e82cb6f5 13 * See the License for the specific language governing permissions and
thedo 167:2ee3e82cb6f5 14 * limitations under the License.
thedo 167:2ee3e82cb6f5 15 */
thedo 167:2ee3e82cb6f5 16 #ifndef MBED_BUSOUT_H
thedo 167:2ee3e82cb6f5 17 #define MBED_BUSOUT_H
thedo 167:2ee3e82cb6f5 18
thedo 167:2ee3e82cb6f5 19 #include "drivers/DigitalOut.h"
thedo 167:2ee3e82cb6f5 20 #include "platform/PlatformMutex.h"
thedo 167:2ee3e82cb6f5 21
thedo 167:2ee3e82cb6f5 22 namespace mbed {
thedo 167:2ee3e82cb6f5 23 /** \addtogroup drivers */
thedo 167:2ee3e82cb6f5 24
thedo 167:2ee3e82cb6f5 25 /** A digital output bus, used for setting the state of a collection of pins
thedo 167:2ee3e82cb6f5 26 * @ingroup drivers
thedo 167:2ee3e82cb6f5 27 */
thedo 167:2ee3e82cb6f5 28 class BusOut {
thedo 167:2ee3e82cb6f5 29
thedo 167:2ee3e82cb6f5 30 public:
thedo 167:2ee3e82cb6f5 31
thedo 167:2ee3e82cb6f5 32 /** Create an BusOut, connected to the specified pins
thedo 167:2ee3e82cb6f5 33 *
thedo 167:2ee3e82cb6f5 34 * @param p0 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 35 * @param p1 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 36 * @param p2 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 37 * @param p3 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 38 * @param p4 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 39 * @param p5 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 40 * @param p6 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 41 * @param p7 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 42 * @param p8 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 43 * @param p9 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 44 * @param p10 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 45 * @param p11 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 46 * @param p12 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 47 * @param p13 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 48 * @param p14 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 49 * @param p15 DigitalOut pin to connect to bus bit
thedo 167:2ee3e82cb6f5 50 *
thedo 167:2ee3e82cb6f5 51 * @note Synchronization level: Thread safe
thedo 167:2ee3e82cb6f5 52 *
thedo 167:2ee3e82cb6f5 53 * @note
thedo 167:2ee3e82cb6f5 54 * It is only required to specify as many pin variables as is required
thedo 167:2ee3e82cb6f5 55 * for the bus; the rest will default to NC (not connected)
thedo 167:2ee3e82cb6f5 56 */
thedo 167:2ee3e82cb6f5 57 BusOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
thedo 167:2ee3e82cb6f5 58 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
thedo 167:2ee3e82cb6f5 59 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
thedo 167:2ee3e82cb6f5 60 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
thedo 167:2ee3e82cb6f5 61
thedo 167:2ee3e82cb6f5 62 /** Create an BusOut, connected to the specified pins
thedo 167:2ee3e82cb6f5 63 *
thedo 167:2ee3e82cb6f5 64 * @param pins An array of pins to connect to bus the bit
thedo 167:2ee3e82cb6f5 65 */
thedo 167:2ee3e82cb6f5 66 BusOut(PinName pins[16]);
thedo 167:2ee3e82cb6f5 67
thedo 167:2ee3e82cb6f5 68 virtual ~BusOut();
thedo 167:2ee3e82cb6f5 69
thedo 167:2ee3e82cb6f5 70 /** Write the value to the output bus
thedo 167:2ee3e82cb6f5 71 *
thedo 167:2ee3e82cb6f5 72 * @param value An integer specifying a bit to write for every corresponding DigitalOut pin
thedo 167:2ee3e82cb6f5 73 */
thedo 167:2ee3e82cb6f5 74 void write(int value);
thedo 167:2ee3e82cb6f5 75
thedo 167:2ee3e82cb6f5 76 /** Read the value currently output on the bus
thedo 167:2ee3e82cb6f5 77 *
thedo 167:2ee3e82cb6f5 78 * @returns
thedo 167:2ee3e82cb6f5 79 * An integer with each bit corresponding to associated DigitalOut pin setting
thedo 167:2ee3e82cb6f5 80 */
thedo 167:2ee3e82cb6f5 81 int read();
thedo 167:2ee3e82cb6f5 82
thedo 167:2ee3e82cb6f5 83 /** Binary mask of bus pins connected to actual pins (not NC pins)
thedo 167:2ee3e82cb6f5 84 * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
thedo 167:2ee3e82cb6f5 85 *
thedo 167:2ee3e82cb6f5 86 * @returns
thedo 167:2ee3e82cb6f5 87 * Binary mask of connected pins
thedo 167:2ee3e82cb6f5 88 */
thedo 167:2ee3e82cb6f5 89 int mask() {
thedo 167:2ee3e82cb6f5 90 // No lock needed since _nc_mask is not modified outside the constructor
thedo 167:2ee3e82cb6f5 91 return _nc_mask;
thedo 167:2ee3e82cb6f5 92 }
thedo 167:2ee3e82cb6f5 93
thedo 167:2ee3e82cb6f5 94 /** A shorthand for write()
thedo 167:2ee3e82cb6f5 95 */
thedo 167:2ee3e82cb6f5 96 BusOut& operator= (int v);
thedo 167:2ee3e82cb6f5 97 BusOut& operator= (BusOut& rhs);
thedo 167:2ee3e82cb6f5 98
thedo 167:2ee3e82cb6f5 99 /** Access to particular bit in random-iterator fashion
thedo 167:2ee3e82cb6f5 100 */
thedo 167:2ee3e82cb6f5 101 DigitalOut& operator[] (int index);
thedo 167:2ee3e82cb6f5 102
thedo 167:2ee3e82cb6f5 103 /** A shorthand for read()
thedo 167:2ee3e82cb6f5 104 */
thedo 167:2ee3e82cb6f5 105 operator int();
thedo 167:2ee3e82cb6f5 106
thedo 167:2ee3e82cb6f5 107 protected:
thedo 167:2ee3e82cb6f5 108 virtual void lock();
thedo 167:2ee3e82cb6f5 109 virtual void unlock();
thedo 167:2ee3e82cb6f5 110 DigitalOut* _pin[16];
thedo 167:2ee3e82cb6f5 111
thedo 167:2ee3e82cb6f5 112 /* Mask of bus's NC pins
thedo 167:2ee3e82cb6f5 113 * If bit[n] is set to 1 - pin is connected
thedo 167:2ee3e82cb6f5 114 * if bit[n] is cleared - pin is not connected (NC)
thedo 167:2ee3e82cb6f5 115 */
thedo 167:2ee3e82cb6f5 116 int _nc_mask;
thedo 167:2ee3e82cb6f5 117
thedo 167:2ee3e82cb6f5 118 PlatformMutex _mutex;
thedo 167:2ee3e82cb6f5 119
thedo 167:2ee3e82cb6f5 120 /* disallow copy constructor and assignment operators */
thedo 167:2ee3e82cb6f5 121 private:
thedo 167:2ee3e82cb6f5 122 BusOut(const BusOut&);
thedo 167:2ee3e82cb6f5 123 BusOut & operator = (const BusOut&);
thedo 167:2ee3e82cb6f5 124 };
thedo 167:2ee3e82cb6f5 125
thedo 167:2ee3e82cb6f5 126 } // namespace mbed
thedo 167:2ee3e82cb6f5 127
thedo 167:2ee3e82cb6f5 128 #endif
thedo 167:2ee3e82cb6f5 129