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mbed/drivers/BusOut.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_BUSOUT_H
IKobayashi 0:c88c3b616c00 17 #define MBED_BUSOUT_H
IKobayashi 0:c88c3b616c00 18
IKobayashi 0:c88c3b616c00 19 #include "drivers/DigitalOut.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 output bus, used for setting the state of a collection of pins
IKobayashi 0:c88c3b616c00 27 */
IKobayashi 0:c88c3b616c00 28 class BusOut {
IKobayashi 0:c88c3b616c00 29
IKobayashi 0:c88c3b616c00 30 public:
IKobayashi 0:c88c3b616c00 31
IKobayashi 0:c88c3b616c00 32 /** Create an BusOut, connected to the specified pins
IKobayashi 0:c88c3b616c00 33 *
IKobayashi 0:c88c3b616c00 34 * @param p<n> DigitalOut pin to connect to bus bit <n> (p5-p30, NC)
IKobayashi 0:c88c3b616c00 35 *
IKobayashi 0:c88c3b616c00 36 * @Note Synchronization level: Thread safe
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 BusOut(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 BusOut(PinName pins[16]);
IKobayashi 0:c88c3b616c00 48
IKobayashi 0:c88c3b616c00 49 virtual ~BusOut();
IKobayashi 0:c88c3b616c00 50
IKobayashi 0:c88c3b616c00 51 /** Write the value to the output bus
IKobayashi 0:c88c3b616c00 52 *
IKobayashi 0:c88c3b616c00 53 * @param value An integer specifying a bit to write for every corresponding DigitalOut pin
IKobayashi 0:c88c3b616c00 54 */
IKobayashi 0:c88c3b616c00 55 void write(int value);
IKobayashi 0:c88c3b616c00 56
IKobayashi 0:c88c3b616c00 57 /** Read the value currently output on the bus
IKobayashi 0:c88c3b616c00 58 *
IKobayashi 0:c88c3b616c00 59 * @returns
IKobayashi 0:c88c3b616c00 60 * An integer with each bit corresponding to associated DigitalOut pin setting
IKobayashi 0:c88c3b616c00 61 */
IKobayashi 0:c88c3b616c00 62 int read();
IKobayashi 0:c88c3b616c00 63
IKobayashi 0:c88c3b616c00 64 /** Binary mask of bus pins connected to actual pins (not NC pins)
IKobayashi 0:c88c3b616c00 65 * 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 66 *
IKobayashi 0:c88c3b616c00 67 * @returns
IKobayashi 0:c88c3b616c00 68 * Binary mask of connected pins
IKobayashi 0:c88c3b616c00 69 */
IKobayashi 0:c88c3b616c00 70 int mask() {
IKobayashi 0:c88c3b616c00 71 // No lock needed since _nc_mask is not modified outside the constructor
IKobayashi 0:c88c3b616c00 72 return _nc_mask;
IKobayashi 0:c88c3b616c00 73 }
IKobayashi 0:c88c3b616c00 74
IKobayashi 0:c88c3b616c00 75 /** A shorthand for write()
IKobayashi 0:c88c3b616c00 76 */
IKobayashi 0:c88c3b616c00 77 BusOut& operator= (int v);
IKobayashi 0:c88c3b616c00 78 BusOut& operator= (BusOut& rhs);
IKobayashi 0:c88c3b616c00 79
IKobayashi 0:c88c3b616c00 80 /** Access to particular bit in random-iterator fashion
IKobayashi 0:c88c3b616c00 81 */
IKobayashi 0:c88c3b616c00 82 DigitalOut& operator[] (int index);
IKobayashi 0:c88c3b616c00 83
IKobayashi 0:c88c3b616c00 84 /** A shorthand for read()
IKobayashi 0:c88c3b616c00 85 */
IKobayashi 0:c88c3b616c00 86 operator int();
IKobayashi 0:c88c3b616c00 87
IKobayashi 0:c88c3b616c00 88 protected:
IKobayashi 0:c88c3b616c00 89 virtual void lock();
IKobayashi 0:c88c3b616c00 90 virtual void unlock();
IKobayashi 0:c88c3b616c00 91 DigitalOut* _pin[16];
IKobayashi 0:c88c3b616c00 92
IKobayashi 0:c88c3b616c00 93 /** Mask of bus's NC pins
IKobayashi 0:c88c3b616c00 94 * If bit[n] is set to 1 - pin is connected
IKobayashi 0:c88c3b616c00 95 * if bit[n] is cleared - pin is not connected (NC)
IKobayashi 0:c88c3b616c00 96 */
IKobayashi 0:c88c3b616c00 97 int _nc_mask;
IKobayashi 0:c88c3b616c00 98
IKobayashi 0:c88c3b616c00 99 PlatformMutex _mutex;
IKobayashi 0:c88c3b616c00 100
IKobayashi 0:c88c3b616c00 101 /* disallow copy constructor and assignment operators */
IKobayashi 0:c88c3b616c00 102 private:
IKobayashi 0:c88c3b616c00 103 BusOut(const BusOut&);
IKobayashi 0:c88c3b616c00 104 BusOut & operator = (const BusOut&);
IKobayashi 0:c88c3b616c00 105 };
IKobayashi 0:c88c3b616c00 106
IKobayashi 0:c88c3b616c00 107 } // namespace mbed
IKobayashi 0:c88c3b616c00 108
IKobayashi 0:c88c3b616c00 109 #endif
IKobayashi 0:c88c3b616c00 110
IKobayashi 0:c88c3b616c00 111 /** @}*/