I2C_protocol/i2c.c at master · dwijmistry/I2C_protocol · GitHub

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
			/*i2c.c*/

#include"i2c_defines.h"
#include"i2c.h"
#include"delay.h"

void i2cStart(void){
	sda=1;
	scl=1;
	sda=0;
}

void i2cStop(void){
	scl=0;
	sda=0;
	scl=1;
	sda=1;
}

void i2cWrite(u8 dat){
	u8 i;
	for(i=0;i<8;i++){
		scl=0;
		sda=((dat>>(7-i))&1);	//sda=(dat&(0x80>>i))?1:0;
		scl=1;
	}
}

void i2cAck(void){
	scl=0;
	sda=1;
	scl=1;
	while(sda);
}

void i2cNoAck(void){
	scl=0;
	sda=1;
	scl=1;
}

void i2cMasterAck(void){
	scl=0;
	sda=0;
	scl=1;
	scl=0;
	sda=1;
}

u8 i2cRead(void){
	u8 i,buff=0;
	for(i=0;i<8;i++){
		scl=0;
		scl=1;
		if(sda)
			buff|=0x80>>i;
	}
	return buff;
}

void i2cReStart(void){
	scl=0;
	sda=1;
	scl=1;
	sda=0;
}

//Slave function protocols
void i2cDevWrite(u8 SlaveAddr, u8 buffAddr,u8 dat){
	i2cStart();
	i2cWrite(SlaveAddr & 0xfe);
	i2cAck();
	i2cWrite(buffAddr);
	i2cAck();
	i2cWrite(dat);
	i2cAck();
	i2cStop();
	delay_ms(10);
}

u8 i2cDevRead(u8 SlaveAddr, u8 buffAddr){
	u8 buff=0;
	i2cStart();
	i2cWrite(SlaveAddr & 0xfe);
	i2cAck();
	i2cWrite(buffAddr);
	i2cAck();
	i2cReStart();
	i2cWrite(SlaveAddr|=0x01);
	i2cAck();
	buff=i2cRead();
	i2cNoAck();
	i2cStop();
	return buff;
}

void i2cDevPageWrite(u8 *s8, u8 SlaveAddr, u8 buffStartAddr, u8 len){

	i2cStart();
	i2cWrite(SlaveAddr & 0xfe);
	i2cAck();
	i2cWrite(buffStartAddr);
	i2cAck();
	while(len--){
		i2cWrite(*s8++);
		i2cAck();
	}
	i2cStop();
}

void i2cDevPageRead(u8 *s8, u8 SlaveAddr, u8 buffStartAddr, u8 len){

	u8 i=0;
	i2cStart();
	i2cWrite(SlaveAddr & 0xfe);
	i2cAck();
	i2cWrite(buffStartAddr);
	i2cAck();
	i2cReStart();
	i2cWrite(SlaveAddr|=0x01);
	i2cAck();
	while(len-- >1){
		s8[i++]=i2cRead();
		i2cMasterAck();
	}
	s8[i]=i2cRead();
	i2cNoAck();
	i2cStop();
}
			/*end of i2c.c*/