-
Notifications
You must be signed in to change notification settings - Fork 2
/
gpio.cpp
172 lines (148 loc) · 3.02 KB
/
gpio.cpp
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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
#include "gpio.h"
#include "debug.h"
#include <cstdlib>
#include <cstdio>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <sstream>
#include <iostream>
#include <cstring>
#include <cerrno>
#include <unistd.h>
namespace gpio
{
vector<Led*> leds;
template <typename T>
void writeVal(string fileName, T val)
{
ofstream fs;
fs.open(fileName);
if (fs.fail())
{
cerr << "Failed to open " << fileName << ':' << strerror(errno) << '\n';
exit(EXIT_FAILURE);
}
fs << val;
fs.close();
}
Pin::Pin(int pinNum, int mode) // initialize a GPIO pin
{
int active_low;
stringstream fileName_s;
string fileName;
if (pinNum < 0) // negative value means active low
{
pinNum *= -1;
active_low = 1;
}
else
{
active_low = 0;
}
pin_num = pinNum;
fileName_s << "/sys/class/gpio/gpio" << pinNum;
fileName = fileName_s.str();
struct stat st;
if (stat(fileName.c_str(), &st) != 0) writeVal<int>("/sys/class/gpio/export", pinNum);
writeVal<int>(fileName + "/active_low", active_low);
writeVal<string>(fileName + "/direction", mode == OUTPUT ? "out" : "in");
fs.open(fileName + "/value", mode == OUTPUT ? ios::out : ios::in);
if (fs.fail())
{
cerr << "Failed to open " << fileName << ':' << strerror(errno) << '\n';
exit(EXIT_FAILURE);
}
activeText = "";
inactiveText = "";
if (debug.verbose) printf("Initialized GPIO pin %d (%sput, active %s)\n", pinNum, mode == OUTPUT ? "out" : "in", active_low ? "low" : "high");
}
Pin::~Pin()
{
fs.close();
writeVal<int>("/sys/class/gpio/unexport", pin_num);
}
Led::Led(int pin1, int pin2)
{
greenPin = new Pin(pin1, OUTPUT);
if (pin2 < 65536)
{
redPin = new Pin(pin2, OUTPUT);
biColor = true;
}
else biColor = false;
if (debug.verbose) printf("LED at pin %d is %sbicolor\n", pin1, biColor ? "": "not ");
color = LedOff;
blink = Solid;
blinkColor = LedOff;
blinkState = false;
setPins(LedOff);
leds.push_back(this);
}
Led::~Led()
{
delete greenPin;
delete redPin;
}
void Led::update()
{
lock_guard<mutex> guard(m);
switch (blink)
{
case Solid:
break;
case BlinkOnce:
case Blink:
if (blinkState)
{
blinkState = false;
setPins(color);
if (blink == BlinkOnce) blink = Solid;
}
else
{
blinkState = true;
setPins(blinkColor);
}
break;
}
}
void Led::setPins(LedColor c)
{
switch (c)
{
case LedOff:
greenPin->set(false);
if (biColor) redPin->set(false);
break;
case Red:
greenPin->set(false);
if (biColor) redPin->set(true);
break;
case Green:
greenPin->set(true);
if (biColor) redPin->set(false);
break;
}
}
void Led::set(LedColor c, LedBlink b, LedColor bc)
{
lock_guard<mutex> guard(m);
bool update = (color != c);
color = c;
blink = b;
blinkColor = bc;
if (update) setPins(c);
}
void* gpio_thread(void*)
{
for (;;)
{
usleep(100000);
for (vector<Led*>::iterator l = leds.begin(); l != leds.end(); ++l)
{
(*l)->update();
}
}
}
}