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BusInOut.h
1 /* mbed Microcontroller Library
2  * Copyright (c) 2006-2013 ARM Limited
3  * SPDX-License-Identifier: Apache-2.0
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17 #ifndef MBED_BUSINOUT_H
18 #define MBED_BUSINOUT_H
19 
20 #include "drivers/DigitalInOut.h"
21 #include "platform/PlatformMutex.h"
22 #include "platform/NonCopyable.h"
23 
24 namespace mbed {
25 /** \addtogroup drivers */
26 
27 /** A digital input output bus, used for setting the state of a collection of pins.
28  * Implemented as an array of DigitalInOut pins, the bus can be constructed by any
29  * pins without restriction other than being capable of digital input or output
30  * capabilities
31  *
32  * @note Synchronization level: Thread safe
33  * @ingroup drivers
34  */
35 class BusInOut : private NonCopyable<BusInOut> {
36 
37 public:
38 
39  /** Create a BusInOut, connected to the specified pins
40  *
41  * @param p0 DigitalInOut pin to connect to bus bit
42  * @param p1 DigitalInOut pin to connect to bus bit
43  * @param p2 DigitalInOut pin to connect to bus bit
44  * @param p3 DigitalInOut pin to connect to bus bit
45  * @param p4 DigitalInOut pin to connect to bus bit
46  * @param p5 DigitalInOut pin to connect to bus bit
47  * @param p6 DigitalInOut pin to connect to bus bit
48  * @param p7 DigitalInOut pin to connect to bus bit
49  * @param p8 DigitalInOut pin to connect to bus bit
50  * @param p9 DigitalInOut pin to connect to bus bit
51  * @param p10 DigitalInOut pin to connect to bus bit
52  * @param p11 DigitalInOut pin to connect to bus bit
53  * @param p12 DigitalInOut pin to connect to bus bit
54  * @param p13 DigitalInOut pin to connect to bus bit
55  * @param p14 DigitalInOut pin to connect to bus bit
56  * @param p15 DigitalInOut pin to connect to bus bit
57  *
58  * @note
59  * It is only required to specify as many pin variables as is required
60  * for the bus; the rest will default to NC (not connected)
61  */
62  BusInOut(PinName p0, PinName p1 = NC, PinName p2 = NC, PinName p3 = NC,
63  PinName p4 = NC, PinName p5 = NC, PinName p6 = NC, PinName p7 = NC,
64  PinName p8 = NC, PinName p9 = NC, PinName p10 = NC, PinName p11 = NC,
65  PinName p12 = NC, PinName p13 = NC, PinName p14 = NC, PinName p15 = NC);
66 
67  /** Create a BusInOut, connected to the specified pins
68  *
69  * @param pins An array of pins (PinName) to construct a BusInOut from. The maximum
70  * number of pins in the array is 16 and any pins that are unspecified or are not to be
71  * connected must be specified as NC in the array that is passed in
72  */
73  BusInOut(PinName pins[16]);
74 
75  virtual ~BusInOut();
76 
77  /* Group: Access Methods */
78 
79  /** Write the value to the output bus
80  *
81  * @param value An integer specifying a bit to write for every corresponding DigitalInOut pin
82  */
83  void write(int value);
84 
85  /** Read the value currently output on the bus
86  *
87  * @returns
88  * An integer with each bit corresponding to associated DigitalInOut pin setting
89  */
90  int read();
91 
92  /** Set all the pins in bus as output
93  */
94  void output();
95 
96  /** Set all the pins in bus as an input
97  */
98  void input();
99 
100  /** Set the input pin mode for all the pins in bus
101  *
102  * @param pull PullUp, PullDown, PullNone
103  */
104  void mode(PinMode pull);
105 
106  /** Binary mask of bus pins connected to actual pins (not NC pins)
107  * If bus pin is in NC state make corresponding bit will be cleared (set to 0), else bit will be set to 1
108  *
109  * @returns
110  * Binary mask of connected pins
111  */
112  int mask()
113  {
114  // No lock needed since _nc_mask is not modified outside the constructor
115  return _nc_mask;
116  }
117 
118  /** A shorthand for write()
119  * \sa BusInOut::write()
120  */
121  BusInOut &operator= (int v);
122  BusInOut &operator= (BusInOut &rhs);
123 
124  /** Access to particular bit in random-iterator fashion
125  * @param index Bit Position
126  */
127  DigitalInOut &operator[](int index);
128 
129  /** A shorthand for read()
130  * \sa BusInOut::read()
131  */
132  operator int();
133 
134 protected:
135 #if !defined(DOXYGEN_ONLY)
136  virtual void lock();
137  virtual void unlock();
138  DigitalInOut *_pin[16];
139 
140  /* Mask of bus's NC pins
141  * If bit[n] is set to 1 - pin is connected
142  * if bit[n] is cleared - pin is not connected (NC)
143  */
144  int _nc_mask;
145 
146  PlatformMutex _mutex;
147 #endif //!defined(DOXYGEN_ONLY)
148 };
149 
150 } // namespace mbed
151 
152 #endif
mbed::BusInOut::operator[]
DigitalInOut & operator[](int index)
Access to particular bit in random-iterator fashion.
mbed::BusInOut
A digital input output bus, used for setting the state of a collection of pins.
Definition: BusInOut.h:35
mbed::BusInOut::mask
int mask()
Binary mask of bus pins connected to actual pins (not NC pins) If bus pin is in NC state make corresp...
Definition: BusInOut.h:112
mbed::BusInOut::input
void input()
Set all the pins in bus as an input.
mbed::DigitalInOut
A digital input/output, used for setting or reading a bi-directional pin.
Definition: DigitalInOut.h:33
mbed::NonCopyable
Prevents generation of copy constructor and copy assignment operator in derived classes.
Definition: NonCopyable.h:168
PlatformMutex
The PlatformMutex class is used to synchronize the execution of threads.
Definition: PlatformMutex.h:47
mbed::BusInOut::output
void output()
Set all the pins in bus as output.
mbed::BusInOut::BusInOut
BusInOut(PinName p0, PinName p1=NC, PinName p2=NC, PinName p3=NC, PinName p4=NC, PinName p5=NC, PinName p6=NC, PinName p7=NC, PinName p8=NC, PinName p9=NC, PinName p10=NC, PinName p11=NC, PinName p12=NC, PinName p13=NC, PinName p14=NC, PinName p15=NC)
Create a BusInOut, connected to the specified pins.
mbed::BusInOut::mode
void mode(PinMode pull)
Set the input pin mode for all the pins in bus.
mbed::BusInOut::write
void write(int value)
Write the value to the output bus.
mbed::BusInOut::read
int read()
Read the value currently output on the bus.
mbed::BusInOut::operator=
BusInOut & operator=(int v)
A shorthand for write()
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