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mbed/drivers/BusInOut.h@0:c88c3b616c00, 2020-03-16 (annotated)

Committer:
IKobayashi
Date:
Mon Mar 16 23:37:42 2020 +0900
Revision:
0:c88c3b616c00
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IKobayashi 0:c88c3b616c00 1 /* mbed Microcontroller Library
IKobayashi 0:c88c3b616c00 2 * Copyright (c) 2006-2013 ARM Limited
IKobayashi 0:c88c3b616c00 3 *
IKobayashi 0:c88c3b616c00 4 * Licensed under the Apache License, Version 2.0 (the "License");
IKobayashi 0:c88c3b616c00 5 * you may not use this file except in compliance with the License.
IKobayashi 0:c88c3b616c00 6 * You may obtain a copy of the License at
IKobayashi 0:c88c3b616c00 7 *
IKobayashi 0:c88c3b616c00 8 * http://www.apache.org/licenses/LICENSE-2.0
IKobayashi 0:c88c3b616c00 9 *
IKobayashi 0:c88c3b616c00 10 * Unless required by applicable law or agreed to in writing, software
IKobayashi 0:c88c3b616c00 11 * distributed under the License is distributed on an "AS IS" BASIS,
IKobayashi 0:c88c3b616c00 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
IKobayashi 0:c88c3b616c00 13 * See the License for the specific language governing permissions and
IKobayashi 0:c88c3b616c00 14 * limitations under the License.
IKobayashi 0:c88c3b616c00 15 */
IKobayashi 0:c88c3b616c00 16 #ifndef MBED_BUSINOUT_H
IKobayashi 0:c88c3b616c00 17 #define MBED_BUSINOUT_H
IKobayashi 0:c88c3b616c00 18
IKobayashi 0:c88c3b616c00 19 #include "drivers/DigitalInOut.h"
IKobayashi 0:c88c3b616c00 20 #include "platform/PlatformMutex.h"
IKobayashi 0:c88c3b616c00 21
IKobayashi 0:c88c3b616c00 22 namespace mbed {
IKobayashi 0:c88c3b616c00 23 /** \addtogroup drivers */
IKobayashi 0:c88c3b616c00 24 /** @{*/
IKobayashi 0:c88c3b616c00 25
IKobayashi 0:c88c3b616c00 26 /** A digital input output bus, used for setting the state of a collection of pins
IKobayashi 0:c88c3b616c00 27 *
IKobayashi 0:c88c3b616c00 28 * @Note Synchronization level: Thread safe
IKobayashi 0:c88c3b616c00 29 */
IKobayashi 0:c88c3b616c00 30 class BusInOut {
IKobayashi 0:c88c3b616c00 31
IKobayashi 0:c88c3b616c00 32 public:
IKobayashi 0:c88c3b616c00 33
IKobayashi 0:c88c3b616c00 34 /** Create an BusInOut, connected to the specified pins
IKobayashi 0:c88c3b616c00 35 *
IKobayashi 0:c88c3b616c00 36 * @param p<n> DigitalInOut pin to connect to bus bit p<n> (p5-p30, NC)
IKobayashi 0:c88c3b616c00 37 *
IKobayashi 0:c88c3b616c00 38 * @note
IKobayashi 0:c88c3b616c00 39 * It is only required to specify as many pin variables as is required
IKobayashi 0:c88c3b616c00 40 * for the bus; the rest will default to NC (not connected)
IKobayashi 0:c88c3b616c00 41 */
IKobayashi 0:c88c3b616c00 42 BusInOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
IKobayashi 0:c88c3b616c00 43 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
IKobayashi 0:c88c3b616c00 44 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
IKobayashi 0:c88c3b616c00 45 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
IKobayashi 0:c88c3b616c00 46
IKobayashi 0:c88c3b616c00 47 BusInOut(PinName pins[16]);
IKobayashi 0:c88c3b616c00 48
IKobayashi 0:c88c3b616c00 49 virtual ~BusInOut();
IKobayashi 0:c88c3b616c00 50
IKobayashi 0:c88c3b616c00 51 /* Group: Access Methods */
IKobayashi 0:c88c3b616c00 52
IKobayashi 0:c88c3b616c00 53 /** Write the value to the output bus
IKobayashi 0:c88c3b616c00 54 *
IKobayashi 0:c88c3b616c00 55 * @param value An integer specifying a bit to write for every corresponding DigitalInOut pin
IKobayashi 0:c88c3b616c00 56 */
IKobayashi 0:c88c3b616c00 57 void write(int value);
IKobayashi 0:c88c3b616c00 58
IKobayashi 0:c88c3b616c00 59 /** Read the value currently output on the bus
IKobayashi 0:c88c3b616c00 60 *
IKobayashi 0:c88c3b616c00 61 * @returns
IKobayashi 0:c88c3b616c00 62 * An integer with each bit corresponding to associated DigitalInOut pin setting
IKobayashi 0:c88c3b616c00 63 */
IKobayashi 0:c88c3b616c00 64 int read();
IKobayashi 0:c88c3b616c00 65
IKobayashi 0:c88c3b616c00 66 /** Set as an output
IKobayashi 0:c88c3b616c00 67 */
IKobayashi 0:c88c3b616c00 68 void output();
IKobayashi 0:c88c3b616c00 69
IKobayashi 0:c88c3b616c00 70 /** Set as an input
IKobayashi 0:c88c3b616c00 71 */
IKobayashi 0:c88c3b616c00 72 void input();
IKobayashi 0:c88c3b616c00 73
IKobayashi 0:c88c3b616c00 74 /** Set the input pin mode
IKobayashi 0:c88c3b616c00 75 *
IKobayashi 0:c88c3b616c00 76 * @param mode PullUp, PullDown, PullNone
IKobayashi 0:c88c3b616c00 77 */
IKobayashi 0:c88c3b616c00 78 void mode(PinMode pull);
IKobayashi 0:c88c3b616c00 79
IKobayashi 0:c88c3b616c00 80 /** Binary mask of bus pins connected to actual pins (not NC pins)
IKobayashi 0:c88c3b616c00 81 * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
IKobayashi 0:c88c3b616c00 82 *
IKobayashi 0:c88c3b616c00 83 * @returns
IKobayashi 0:c88c3b616c00 84 * Binary mask of connected pins
IKobayashi 0:c88c3b616c00 85 */
IKobayashi 0:c88c3b616c00 86 int mask() {
IKobayashi 0:c88c3b616c00 87 // No lock needed since _nc_mask is not modified outside the constructor
IKobayashi 0:c88c3b616c00 88 return _nc_mask;
IKobayashi 0:c88c3b616c00 89 }
IKobayashi 0:c88c3b616c00 90
IKobayashi 0:c88c3b616c00 91 /** A shorthand for write()
IKobayashi 0:c88c3b616c00 92 */
IKobayashi 0:c88c3b616c00 93 BusInOut& operator= (int v);
IKobayashi 0:c88c3b616c00 94 BusInOut& operator= (BusInOut& rhs);
IKobayashi 0:c88c3b616c00 95
IKobayashi 0:c88c3b616c00 96 /** Access to particular bit in random-iterator fashion
IKobayashi 0:c88c3b616c00 97 */
IKobayashi 0:c88c3b616c00 98 DigitalInOut& operator[] (int index);
IKobayashi 0:c88c3b616c00 99
IKobayashi 0:c88c3b616c00 100 /** A shorthand for read()
IKobayashi 0:c88c3b616c00 101 */
IKobayashi 0:c88c3b616c00 102 operator int();
IKobayashi 0:c88c3b616c00 103
IKobayashi 0:c88c3b616c00 104 protected:
IKobayashi 0:c88c3b616c00 105 virtual void lock();
IKobayashi 0:c88c3b616c00 106 virtual void unlock();
IKobayashi 0:c88c3b616c00 107 DigitalInOut* _pin[16];
IKobayashi 0:c88c3b616c00 108
IKobayashi 0:c88c3b616c00 109 /** Mask of bus's NC pins
IKobayashi 0:c88c3b616c00 110 * If bit[n] is set to 1 - pin is connected
IKobayashi 0:c88c3b616c00 111 * if bit[n] is cleared - pin is not connected (NC)
IKobayashi 0:c88c3b616c00 112 */
IKobayashi 0:c88c3b616c00 113 int _nc_mask;
IKobayashi 0:c88c3b616c00 114
IKobayashi 0:c88c3b616c00 115 PlatformMutex _mutex;
IKobayashi 0:c88c3b616c00 116
IKobayashi 0:c88c3b616c00 117 /* disallow copy constructor and assignment operators */
IKobayashi 0:c88c3b616c00 118 private:
IKobayashi 0:c88c3b616c00 119 BusInOut(const BusInOut&);
IKobayashi 0:c88c3b616c00 120 BusInOut & operator = (const BusInOut&);
IKobayashi 0:c88c3b616c00 121 };
IKobayashi 0:c88c3b616c00 122
IKobayashi 0:c88c3b616c00 123 } // namespace mbed
IKobayashi 0:c88c3b616c00 124
IKobayashi 0:c88c3b616c00 125 #endif
IKobayashi 0:c88c3b616c00 126
IKobayashi 0:c88c3b616c00 127 /** @}*/