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#include "CSU32P10.h"
//#include "define_data.h"
#include "define_function.h"
#include "my_define.h"
#define SDA PT3_1 //定義SDA所對(duì)應(yīng)的GPIO接口編號(hào)P1.4
#define SCL PT3_0 //定義SCL所對(duì)應(yīng)的GPIO接口編號(hào)P1.5
#define SDAEN PT3EN_1 //定義SDA所對(duì)應(yīng)的GPIO接口編號(hào)P1.4
#define SCLEN PT3EN_0 //定義SCL所對(duì)應(yīng)的GPIO接口編號(hào)P1.5
#define I2C_ADDR 0x3c
#define somenop asm("nop");asm("nop");asm("nop");asm("nop");
//#define I2C_ADDR 0x3c
unsigned char buf0;
unsigned char buf1;
unsigned char i2c_step;
//短delay
/* I2C起始條件 */
void i2c_start()
{
//初始化GPIO口
SDAEN = 1; //設(shè)置SDA方向?yàn)檩敵?
SCLEN = 1; //設(shè)置SCL方向?yàn)檩敵?
SDA = 1; //設(shè)置SDA為高電平
asm("nop");
SCL = 1; //設(shè)置SCL為高電平
somenop
somenop
SDA = 0; //SCL為高電平時(shí)，SDA由高變低
somenop
somenop
somenop
somenop
somenop
somenop
SCL = 0;
}
/* I2C終止條件 */
void i2c_stop()
{
somenop
SDA = 0;
SDAEN = 1;
somenop
SCL = 1;
somenop
somenop
somenop
somenop
somenop
somenop
SDA = 1; //SCL高電平時(shí)，SDA由低變高
somenop
SDAEN = 0;
// SCL = 0;
}
/*
I2C讀取ACK信號(hào)(寫數(shù)據(jù)時(shí)使用)
返回值：0表示ACK信號(hào)有效；非0表示ACK信號(hào)無效
*/
void i2c_read_ack()
{
SCL = 0; // SCL變低
SDAEN = 0; //設(shè)置SDA方向?yàn)檩斎?br />
somenop
SCL = 1; // SCL變高
somenop
if(SDA)
{
i2c_step = 0xff;
return;
}
SCL = 0;
asm("nop");
asm("nop");
asm("nop");
asm("nop");
}
/* I2C發(fā)出ACK信號(hào)(讀數(shù)據(jù)時(shí)使用) */
void i2c_send_ack()
{
SCL = 0; // SCL變低
somenop
SDA = 1; //發(fā)出ACK信號(hào)
SDAEN = 1; //設(shè)置SDA方向?yàn)檩敵?nbsp;
asm("nop");
asm("nop");
asm("nop");
SCL = 1; // SCL變高
somenop
SCL = 0;
// SDAEN = 1;
asm("nop");
asm("nop");
}
/* I2C字節(jié)寫 */
void i2c_resume()
{
GIE = 0;
delay_1s();
delay_1s();
i2c_read_ack();
i2c_read_ack();
i2c_read_ack();
i2c_read_ack();
i2c_read_ack();
i2c_read_ack();
i2c_read_ack();
i2c_read_ack();
GIE = 1;
}
void i2c_write_byte(unsigned char b)
{
SDAEN = 1; //設(shè)置SDA方向?yàn)檩敵?nbsp;
SCL = 0;
for (i2c_step = 8; i2c_step > 0; i2c_step --)
{
SCL = 0; // SCL變低
asm("nop");
if( b & (1 << (i2c_step - 1)))
SDA = 1;
else
SDA = 0;
asm("nop");
SCL = 1; // SCL變高
somenop
SCL = 0;
}
i2c_read_ack();
}
/* I2C字節(jié)讀 */
void i2c_read_byte()
{
buf1 = 0;
SDAEN = 0; //設(shè)置SDA方向?yàn)檩斎?br />
for(i2c_step = 8; i2c_step > 0; i2c_step --)
{
SCL = 0; // SCL變低
asm("nop");
asm("nop");
SCL = 1;
//i2c_result = (i2c_result << 1) | SDA;
buf1 = (buf1 << 1) | SDA;
// SCL變高
// asm("nop");
// asm("nop");
SCL = 0;
}
i2c_send_ack(); //向目標(biāo)設(shè)備發(fā)送ACK信號(hào)
}
/*
I2C讀操作
addr：目標(biāo)設(shè)備地址
buf：讀緩沖區(qū)
len：讀入字節(jié)的長度
*/
void i2c_read()
{
i2c_start(); //起始條件，開始數(shù)據(jù)通信
//發(fā)送地址和數(shù)據(jù)讀寫方向
i2c_write_byte(I2C_ADDR<<1); //I2C ADDR
asm("nop");
if(i2c_step == 0xff)
{
i2c_resume();
return;
}
i2c_write_byte(buf0); //Reg ADDR
asm("nop");
if(i2c_step == 0xff)
{
i2c_resume();
return;
}
//asm("nop");
i2c_start();//restart
i2c_write_byte((I2C_ADDR<<1) +1); //Reg ADDR
asm("nop");
if(i2c_step == 0xff)
{
i2c_resume();
return;
}
//讀入數(shù)據(jù)
i2c_read_byte();
i2c_stop();
//終止條件，結(jié)束數(shù)據(jù)通信
}
/*
I2C寫操作
addr：目標(biāo)設(shè)備地址
buf：寫緩沖區(qū)
len：寫入字節(jié)的長度
*/
void i2c_write()
{
i2c_start(); //起始條件，開始數(shù)據(jù)通信
//發(fā)送地址和數(shù)據(jù)讀寫方向
i2c_write_byte(I2C_ADDR<<1);
asm("nop");
if(i2c_step == 0xff)
{
i2c_resume();
return;
}
//寫入數(shù)據(jù)
i2c_write_byte(buf0);
asm("nop");
if(i2c_step == 0xff)
{
i2c_resume();
return;
}
i2c_write_byte(buf1);
asm("nop");
if(i2c_step == 0xff)
{
i2c_resume();
return;
}
i2c_stop(); //終止條件，結(jié)束數(shù)據(jù)通信
}

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