blob: 5b3b7079edf7c58bfc6e41b60ec10d7fff725546 (
plain)
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
|
//PIN 18 -> RC3 -> SCL
//PIN 23 -> RC4 ->SDA
#include "i2c.h"
#include "conf.h"
void I2C_Master_Init(const unsigned long freq_K) //Begin IIC as master
{
TRISC3 = 1; TRISC4 = 1; //Set SDA and SCL pins as input pins
SSPCON = 0b00101000; //pg84/234
SSPCON2 = 0b00000000; //pg85/234
SSPADD = (_XTAL_FREQ/(4*freq_K*100))-1; //Setting Clock Speed pg99/234
SSPSTAT = 0b00000000; //pg83/234
}
void I2C_Master_Wait()
{
while ( (SSPCON2 & 0b00011111) || (SSPSTAT & 0b00000100) ) ; //check the bis on registers to make sure the IIC is not in progress
}
void I2C_Master_Start()
{
I2C_Master_Wait(); //Hold the program if I2C is busy
SEN = 1; //Begin IIC pg85/234
}
void I2C_Master_Repeated_Start()
{
I2C_Master_Wait();
RSEN = 1; //Initiate repeated start condition
}
void I2C_Master_Stop()
{
I2C_Master_Wait(); //Hold the program is I2C is busy
PEN = 1; //End IIC pg85/234
}
void I2C_Master_Write(unsigned data)
{
I2C_Master_Wait(); //Hold the program is I2C is busy
SSPBUF = data; //pg82/234
}
unsigned short I2C_Master_Read(unsigned short ack)
{
unsigned short incoming;
I2C_Master_Wait();
RCEN = 1;
I2C_Master_Wait();
incoming = SSPBUF; //get the data saved in SSPBUF
I2C_Master_Wait();
ACKDT = (ack)?0:1; //check if ack bit received
ACKEN = 1; //pg 85/234
return incoming;
}
|
