DigitalOut.h
2.78 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
/* mbed Microcontroller Library
* Copyright (c) 2006-2013 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MBED_DIGITALOUT_H
#define MBED_DIGITALOUT_H
#include "platform.h"
#include "gpio_api.h"
namespace mbed {
/** A digital output, used for setting the state of a pin
*
* Example:
* @code
* // Toggle a LED
* #include "mbed.h"
*
* DigitalOut led(LED1);
*
* int main() {
* while(1) {
* led = !led;
* wait(0.2);
* }
* }
* @endcode
*/
class DigitalOut {
public:
/** Create a DigitalOut connected to the specified pin
*
* @param pin DigitalOut pin to connect to
*/
DigitalOut(PinName pin) : gpio() {
gpio_init_out(&gpio, pin);
}
/** Create a DigitalOut connected to the specified pin
*
* @param pin DigitalOut pin to connect to
* @param value the initial pin value
*/
DigitalOut(PinName pin, int value) : gpio() {
gpio_init_out_ex(&gpio, pin, value);
}
/** Set the output, specified as 0 or 1 (int)
*
* @param value An integer specifying the pin output value,
* 0 for logical 0, 1 (or any other non-zero value) for logical 1
*/
void write(int value) {
gpio_write(&gpio, value);
}
/** Return the output setting, represented as 0 or 1 (int)
*
* @returns
* an integer representing the output setting of the pin,
* 0 for logical 0, 1 for logical 1
*/
int read() {
return gpio_read(&gpio);
}
/** Return the output setting, represented as 0 or 1 (int)
*
* @returns
* Non zero value if pin is connected to uc GPIO
* 0 if gpio object was initialized with NC
*/
int is_connected() {
return gpio_is_connected(&gpio);
}
#ifdef MBED_OPERATORS
/** A shorthand for write()
*/
DigitalOut& operator= (int value) {
write(value);
return *this;
}
DigitalOut& operator= (DigitalOut& rhs) {
write(rhs.read());
return *this;
}
/** A shorthand for read()
*/
operator int() {
return read();
}
#endif
protected:
gpio_t gpio;
};
} // namespace mbed
#endif