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
|
/* EXAMPLE FIRMWARE
* CONTROLLING WPP DRIVERS FROM ARDUINO UNO
*
* SERIAL INTERFACE
* 9600 baud
* newline terminated (no carriage return)
* space separated commands:
* <ADDRESS> <LED INTENSITY> <FAN INTENSITY>
*
* example: full brightness full speed:
* 38 255 255
* example: LED off fan full speed:
* 38 0 255
* example: LED medium fan off
* 38 100 0
*
* if <ADDRESS> 0, commands sent to all devices
*
* if <ADDRESS> -1, list of addresses seen returned
*/
#include <Wire.h>
#define INPUT_SIZE 100 // TODO: make this a reasonable value
#define sep " "
char input[INPUT_SIZE + 1];
char c_address = '0';
char c_led = '0';
char c_fan = '0';
int address = 0;
int led = 0;
int fan = 0;
void setup() {
pinMode(A4, OUTPUT);
pinMode(A5, OUTPUT);
Wire.begin();
Serial.begin(9600);
}
void loop() {
}
void scan() {
Serial.println("scanning!");
byte error, address;
for(address = 1; address < 127; address++ )
{
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
Wire.beginTransmission(address);
error = Wire.endTransmission();
if (error == 0)
{
Serial.print("I2C device found at address ");
Serial.println(address);
}
}
}
void serialEvent() { // occurs whenever new data comes in the hardware serial RX
// read serial into input char array
byte size = Serial.readBytesUntil('\n', input, INPUT_SIZE);
input[size] = 0;
// parse input
char *c_address = strtok(input, sep);
char *c_led = strtok(0, sep);
char *c_fan = strtok(0, sep);
// convert input
address = atoi(c_address);
led = atoi(c_led);
fan = atoi(c_fan);
// scan if address is less than zero
if (address < 0) {
scan();
}
// write to peripheral
uint8_t buf[1];
buf[0] = fan;
buf[1] = led;
Wire.beginTransmission(address);
Wire.write(buf, 2);
Wire.endTransmission();
}
void serialEventRun(void) {
// this runs inside of the main loop, essentially
if (Serial.available()) serialEvent();
}
|
