joey shelton / LED_Demo2

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Dependencies:   MAX44000 PWM_Tone_Library nexpaq_mdk

Fork of LED_Demo by joey shelton

mbd_os/hal/api/BusInOut.h@9:6bb35cef007d, 2016-10-22 (annotated)

Committer:
cyberjoey
Date:
Sat Oct 22 01:31:58 2016 +0000
Revision:
9:6bb35cef007d
Parent:
1:55a6170b404f 
WORKING

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 1:55a6170b404f 1 /* mbed Microcontroller Library
nexpaq 1:55a6170b404f 2 * Copyright (c) 2006-2013 ARM Limited
nexpaq 1:55a6170b404f 3 *
nexpaq 1:55a6170b404f 4 * Licensed under the Apache License, Version 2.0 (the "License");
nexpaq 1:55a6170b404f 5 * you may not use this file except in compliance with the License.
nexpaq 1:55a6170b404f 6 * You may obtain a copy of the License at
nexpaq 1:55a6170b404f 7 *
nexpaq 1:55a6170b404f 8 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 1:55a6170b404f 9 *
nexpaq 1:55a6170b404f 10 * Unless required by applicable law or agreed to in writing, software
nexpaq 1:55a6170b404f 11 * distributed under the License is distributed on an "AS IS" BASIS,
nexpaq 1:55a6170b404f 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 1:55a6170b404f 13 * See the License for the specific language governing permissions and
nexpaq 1:55a6170b404f 14 * limitations under the License.
nexpaq 1:55a6170b404f 15 */
nexpaq 1:55a6170b404f 16 #ifndef MBED_BUSINOUT_H
nexpaq 1:55a6170b404f 17 #define MBED_BUSINOUT_H
nexpaq 1:55a6170b404f 18
nexpaq 1:55a6170b404f 19 #include "DigitalInOut.h"
nexpaq 1:55a6170b404f 20 #include "PlatformMutex.h"
nexpaq 1:55a6170b404f 21
nexpaq 1:55a6170b404f 22 namespace mbed {
nexpaq 1:55a6170b404f 23
nexpaq 1:55a6170b404f 24 /** A digital input output bus, used for setting the state of a collection of pins
nexpaq 1:55a6170b404f 25 *
nexpaq 1:55a6170b404f 26 * @Note Synchronization level: Thread safe
nexpaq 1:55a6170b404f 27 */
nexpaq 1:55a6170b404f 28 class BusInOut {
nexpaq 1:55a6170b404f 29
nexpaq 1:55a6170b404f 30 public:
nexpaq 1:55a6170b404f 31
nexpaq 1:55a6170b404f 32 /** Create an BusInOut, connected to the specified pins
nexpaq 1:55a6170b404f 33 *
nexpaq 1:55a6170b404f 34 * @param p<n> DigitalInOut pin to connect to bus bit p<n> (p5-p30, NC)
nexpaq 1:55a6170b404f 35 *
nexpaq 1:55a6170b404f 36 * @note
nexpaq 1:55a6170b404f 37 * It is only required to specify as many pin variables as is required
nexpaq 1:55a6170b404f 38 * for the bus; the rest will default to NC (not connected)
nexpaq 1:55a6170b404f 39 */
nexpaq 1:55a6170b404f 40 BusInOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
nexpaq 1:55a6170b404f 41 PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
nexpaq 1:55a6170b404f 42 PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
nexpaq 1:55a6170b404f 43 PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
nexpaq 1:55a6170b404f 44
nexpaq 1:55a6170b404f 45 BusInOut(PinName pins[16]);
nexpaq 1:55a6170b404f 46
nexpaq 1:55a6170b404f 47 virtual ~BusInOut();
nexpaq 1:55a6170b404f 48
nexpaq 1:55a6170b404f 49 /* Group: Access Methods */
nexpaq 1:55a6170b404f 50
nexpaq 1:55a6170b404f 51 /** Write the value to the output bus
nexpaq 1:55a6170b404f 52 *
nexpaq 1:55a6170b404f 53 * @param value An integer specifying a bit to write for every corresponding DigitalInOut pin
nexpaq 1:55a6170b404f 54 */
nexpaq 1:55a6170b404f 55 void write(int value);
nexpaq 1:55a6170b404f 56
nexpaq 1:55a6170b404f 57 /** Read the value currently output on the bus
nexpaq 1:55a6170b404f 58 *
nexpaq 1:55a6170b404f 59 * @returns
nexpaq 1:55a6170b404f 60 * An integer with each bit corresponding to associated DigitalInOut pin setting
nexpaq 1:55a6170b404f 61 */
nexpaq 1:55a6170b404f 62 int read();
nexpaq 1:55a6170b404f 63
nexpaq 1:55a6170b404f 64 /** Set as an output
nexpaq 1:55a6170b404f 65 */
nexpaq 1:55a6170b404f 66 void output();
nexpaq 1:55a6170b404f 67
nexpaq 1:55a6170b404f 68 /** Set as an input
nexpaq 1:55a6170b404f 69 */
nexpaq 1:55a6170b404f 70 void input();
nexpaq 1:55a6170b404f 71
nexpaq 1:55a6170b404f 72 /** Set the input pin mode
nexpaq 1:55a6170b404f 73 *
nexpaq 1:55a6170b404f 74 * @param mode PullUp, PullDown, PullNone
nexpaq 1:55a6170b404f 75 */
nexpaq 1:55a6170b404f 76 void mode(PinMode pull);
nexpaq 1:55a6170b404f 77
nexpaq 1:55a6170b404f 78 /** Binary mask of bus pins connected to actual pins (not NC pins)
nexpaq 1:55a6170b404f 79 * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
nexpaq 1:55a6170b404f 80 *
nexpaq 1:55a6170b404f 81 * @returns
nexpaq 1:55a6170b404f 82 * Binary mask of connected pins
nexpaq 1:55a6170b404f 83 */
nexpaq 1:55a6170b404f 84 int mask() {
nexpaq 1:55a6170b404f 85 // No lock needed since _nc_mask is not modified outside the constructor
nexpaq 1:55a6170b404f 86 return _nc_mask;
nexpaq 1:55a6170b404f 87 }
nexpaq 1:55a6170b404f 88
nexpaq 1:55a6170b404f 89 /** A shorthand for write()
nexpaq 1:55a6170b404f 90 */
nexpaq 1:55a6170b404f 91 BusInOut& operator= (int v);
nexpaq 1:55a6170b404f 92 BusInOut& operator= (BusInOut& rhs);
nexpaq 1:55a6170b404f 93
nexpaq 1:55a6170b404f 94 /** Access to particular bit in random-iterator fashion
nexpaq 1:55a6170b404f 95 */
nexpaq 1:55a6170b404f 96 DigitalInOut& operator[] (int index);
nexpaq 1:55a6170b404f 97
nexpaq 1:55a6170b404f 98 /** A shorthand for read()
nexpaq 1:55a6170b404f 99 */
nexpaq 1:55a6170b404f 100 operator int();
nexpaq 1:55a6170b404f 101
nexpaq 1:55a6170b404f 102 protected:
nexpaq 1:55a6170b404f 103 virtual void lock();
nexpaq 1:55a6170b404f 104 virtual void unlock();
nexpaq 1:55a6170b404f 105 DigitalInOut* _pin[16];
nexpaq 1:55a6170b404f 106
nexpaq 1:55a6170b404f 107 /** Mask of bus's NC pins
nexpaq 1:55a6170b404f 108 * If bit[n] is set to 1 - pin is connected
nexpaq 1:55a6170b404f 109 * if bit[n] is cleared - pin is not connected (NC)
nexpaq 1:55a6170b404f 110 */
nexpaq 1:55a6170b404f 111 int _nc_mask;
nexpaq 1:55a6170b404f 112
nexpaq 1:55a6170b404f 113 PlatformMutex _mutex;
nexpaq 1:55a6170b404f 114
nexpaq 1:55a6170b404f 115 /* disallow copy constructor and assignment operators */
nexpaq 1:55a6170b404f 116 private:
nexpaq 1:55a6170b404f 117 BusInOut(const BusInOut&);
nexpaq 1:55a6170b404f 118 BusInOut & operator = (const BusInOut&);
nexpaq 1:55a6170b404f 119 };
nexpaq 1:55a6170b404f 120
nexpaq 1:55a6170b404f 121 } // namespace mbed
nexpaq 1:55a6170b404f 122
nexpaq 1:55a6170b404f 123 #endif