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The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

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mbed 2

This is the mbed 2 library. If you'd like to learn about Mbed OS please see the mbed-os docs.

drivers/BusInOut.h@145:64910690c574, 2017-06-21 (annotated)

Committer:
AnnaBridge
Date:
Wed Jun 21 17:31:38 2017 +0100
Revision:
145:64910690c574
Parent:
128:9bcdf88f62b0
Child:
146:22da6e220af6
Release 145 of the mbed library.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 128:9bcdf88f62b0 1 /* mbed Microcontroller Library
<> 128:9bcdf88f62b0 2 * Copyright (c) 2006-2013 ARM Limited
<> 128:9bcdf88f62b0 3 *
<> 128:9bcdf88f62b0 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 128:9bcdf88f62b0 5 * you may not use this file except in compliance with the License.
<> 128:9bcdf88f62b0 6 * You may obtain a copy of the License at
<> 128:9bcdf88f62b0 7 *
<> 128:9bcdf88f62b0 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 128:9bcdf88f62b0 9 *
<> 128:9bcdf88f62b0 10 * Unless required by applicable law or agreed to in writing, software
<> 128:9bcdf88f62b0 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 128:9bcdf88f62b0 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 128:9bcdf88f62b0 13 * See the License for the specific language governing permissions and
<> 128:9bcdf88f62b0 14 * limitations under the License.
<> 128:9bcdf88f62b0 15 */
<> 128:9bcdf88f62b0 16 #ifndef MBED_BUSINOUT_H
<> 128:9bcdf88f62b0 17 #define MBED_BUSINOUT_H
<> 128:9bcdf88f62b0 18
<> 128:9bcdf88f62b0 19 #include "drivers/DigitalInOut.h"
<> 128:9bcdf88f62b0 20 #include "platform/PlatformMutex.h"
<> 128:9bcdf88f62b0 21
<> 128:9bcdf88f62b0 22 namespace mbed {
<> 128:9bcdf88f62b0 23 /** \addtogroup drivers */
<> 128:9bcdf88f62b0 24
<> 128:9bcdf88f62b0 25 /** A digital input output bus, used for setting the state of a collection of pins
<> 128:9bcdf88f62b0 26 *
AnnaBridge 145:64910690c574 27 * @note Synchronization level: Thread safe
AnnaBridge 145:64910690c574 28 * @ingroup drivers
<> 128:9bcdf88f62b0 29 */
<> 128:9bcdf88f62b0 30 class BusInOut {
<> 128:9bcdf88f62b0 31
<> 128:9bcdf88f62b0 32 public:
<> 128:9bcdf88f62b0 33
<> 128:9bcdf88f62b0 34 /** Create an BusInOut, connected to the specified pins
<> 128:9bcdf88f62b0 35 *
AnnaBridge 145:64910690c574 36 * @param p0 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 37 * @param p1 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 38 * @param p2 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 39 * @param p3 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 40 * @param p4 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 41 * @param p5 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 42 * @param p6 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 43 * @param p7 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 44 * @param p8 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 45 * @param p9 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 46 * @param p10 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 47 * @param p11 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 48 * @param p12 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 49 * @param p13 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 50 * @param p14 DigitalInOut pin to connect to bus bit
AnnaBridge 145:64910690c574 51 * @param p15 DigitalInOut pin to connect to bus bit
<> 128:9bcdf88f62b0 52 *
<> 128:9bcdf88f62b0 53 * @note
<> 128:9bcdf88f62b0 54 * It is only required to specify as many pin variables as is required
<> 128:9bcdf88f62b0 55 * for the bus; the rest will default to NC (not connected)
<> 128:9bcdf88f62b0 56 */
<> 128:9bcdf88f62b0 57 BusInOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
<> 128:9bcdf88f62b0 58 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
<> 128:9bcdf88f62b0 59 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
<> 128:9bcdf88f62b0 60 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
<> 128:9bcdf88f62b0 61
AnnaBridge 145:64910690c574 62 /** Create an BusInOut, connected to the specified pins
AnnaBridge 145:64910690c574 63 *
AnnaBridge 145:64910690c574 64 * @param pins An array of pins to construct a BusInOut from
AnnaBridge 145:64910690c574 65 */
<> 128:9bcdf88f62b0 66 BusInOut(PinName pins[16]);
<> 128:9bcdf88f62b0 67
<> 128:9bcdf88f62b0 68 virtual ~BusInOut();
<> 128:9bcdf88f62b0 69
<> 128:9bcdf88f62b0 70 /* Group: Access Methods */
<> 128:9bcdf88f62b0 71
<> 128:9bcdf88f62b0 72 /** Write the value to the output bus
<> 128:9bcdf88f62b0 73 *
<> 128:9bcdf88f62b0 74 * @param value An integer specifying a bit to write for every corresponding DigitalInOut pin
<> 128:9bcdf88f62b0 75 */
<> 128:9bcdf88f62b0 76 void write(int value);
<> 128:9bcdf88f62b0 77
<> 128:9bcdf88f62b0 78 /** Read the value currently output on the bus
<> 128:9bcdf88f62b0 79 *
<> 128:9bcdf88f62b0 80 * @returns
<> 128:9bcdf88f62b0 81 * An integer with each bit corresponding to associated DigitalInOut pin setting
<> 128:9bcdf88f62b0 82 */
<> 128:9bcdf88f62b0 83 int read();
<> 128:9bcdf88f62b0 84
<> 128:9bcdf88f62b0 85 /** Set as an output
<> 128:9bcdf88f62b0 86 */
<> 128:9bcdf88f62b0 87 void output();
<> 128:9bcdf88f62b0 88
<> 128:9bcdf88f62b0 89 /** Set as an input
<> 128:9bcdf88f62b0 90 */
<> 128:9bcdf88f62b0 91 void input();
<> 128:9bcdf88f62b0 92
<> 128:9bcdf88f62b0 93 /** Set the input pin mode
<> 128:9bcdf88f62b0 94 *
AnnaBridge 145:64910690c574 95 * @param pull PullUp, PullDown, PullNone
<> 128:9bcdf88f62b0 96 */
<> 128:9bcdf88f62b0 97 void mode(PinMode pull);
<> 128:9bcdf88f62b0 98
<> 128:9bcdf88f62b0 99 /** Binary mask of bus pins connected to actual pins (not NC pins)
<> 128:9bcdf88f62b0 100 * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
<> 128:9bcdf88f62b0 101 *
<> 128:9bcdf88f62b0 102 * @returns
<> 128:9bcdf88f62b0 103 * Binary mask of connected pins
<> 128:9bcdf88f62b0 104 */
<> 128:9bcdf88f62b0 105 int mask() {
<> 128:9bcdf88f62b0 106 // No lock needed since _nc_mask is not modified outside the constructor
<> 128:9bcdf88f62b0 107 return _nc_mask;
<> 128:9bcdf88f62b0 108 }
<> 128:9bcdf88f62b0 109
<> 128:9bcdf88f62b0 110 /** A shorthand for write()
AnnaBridge 145:64910690c574 111 * \sa BusInOut::write()
AnnaBridge 145:64910690c574 112 */
<> 128:9bcdf88f62b0 113 BusInOut& operator= (int v);
<> 128:9bcdf88f62b0 114 BusInOut& operator= (BusInOut& rhs);
<> 128:9bcdf88f62b0 115
<> 128:9bcdf88f62b0 116 /** Access to particular bit in random-iterator fashion
AnnaBridge 145:64910690c574 117 * @param index Bit Position
AnnaBridge 145:64910690c574 118 */
<> 128:9bcdf88f62b0 119 DigitalInOut& operator[] (int index);
<> 128:9bcdf88f62b0 120
<> 128:9bcdf88f62b0 121 /** A shorthand for read()
AnnaBridge 145:64910690c574 122 * \sa BusInOut::read()
<> 128:9bcdf88f62b0 123 */
<> 128:9bcdf88f62b0 124 operator int();
<> 128:9bcdf88f62b0 125
<> 128:9bcdf88f62b0 126 protected:
<> 128:9bcdf88f62b0 127 virtual void lock();
<> 128:9bcdf88f62b0 128 virtual void unlock();
<> 128:9bcdf88f62b0 129 DigitalInOut* _pin[16];
<> 128:9bcdf88f62b0 130
AnnaBridge 145:64910690c574 131 /* Mask of bus's NC pins
<> 128:9bcdf88f62b0 132 * If bit[n] is set to 1 - pin is connected
<> 128:9bcdf88f62b0 133 * if bit[n] is cleared - pin is not connected (NC)
<> 128:9bcdf88f62b0 134 */
<> 128:9bcdf88f62b0 135 int _nc_mask;
<> 128:9bcdf88f62b0 136
<> 128:9bcdf88f62b0 137 PlatformMutex _mutex;
<> 128:9bcdf88f62b0 138
<> 128:9bcdf88f62b0 139 /* disallow copy constructor and assignment operators */
<> 128:9bcdf88f62b0 140 private:
<> 128:9bcdf88f62b0 141 BusInOut(const BusInOut&);
<> 128:9bcdf88f62b0 142 BusInOut & operator = (const BusInOut&);
<> 128:9bcdf88f62b0 143 };
<> 128:9bcdf88f62b0 144
<> 128:9bcdf88f62b0 145 } // namespace mbed
<> 128:9bcdf88f62b0 146
<> 128:9bcdf88f62b0 147 #endif