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SmartBike/i2c.c

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3 years ago
#include"i2c.h"
/*******************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : Delay10us()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>ʱ10us
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
*******************************************************************************/
void Delay10us()
{
unsigned char a,b;
for(b=1;b>0;b--)
for(a=2;a>0;a--);
}
/*******************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : I2cStart()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>ʼ<EFBFBD>źţ<EFBFBD><EFBFBD><EFBFBD>SCLʱ<EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD><EFBFBD>ڸߵ<EFBFBD>ƽ<EFBFBD>ڼ<EFBFBD>SDA<EFBFBD>źŲ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>½<EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>ע : <EFBFBD><EFBFBD>ʼ֮<EFBFBD><EFBFBD>SDA<EFBFBD><EFBFBD>SCL<EFBFBD><EFBFBD>Ϊ0
*******************************************************************************/
void I2cStart()
{
SDA=1;
Delay10us();
SCL=1;
Delay10us();//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>SDA<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>>4.7us
SDA=0;
Delay10us();//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>>4us
SCL=0;
Delay10us();
}
/*******************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : I2cStop()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>ֹ<EFBFBD>źţ<EFBFBD><EFBFBD><EFBFBD>SCLʱ<EFBFBD><EFBFBD><EFBFBD>źŸߵ<EFBFBD>ƽ<EFBFBD>ڼ<EFBFBD>SDA<EFBFBD>źŲ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD>ע : <EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD>󱣳<EFBFBD>SDA<EFBFBD><EFBFBD>SCL<EFBFBD><EFBFBD>Ϊ1<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD>߿<EFBFBD><EFBFBD><EFBFBD>
*******************************************************************************/
void I2cStop()
{
SDA=0;
Delay10us();
SCL=1;
Delay10us();//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>4.7us
SDA=1;
Delay10us();
}
/*******************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : I2cSendByte(unsigned char dat)
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : ͨ<EFBFBD><EFBFBD>I2C<EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ֽڡ<EFBFBD><EFBFBD><EFBFBD>SCLʱ<EFBFBD><EFBFBD><EFBFBD>źŸߵ<EFBFBD>ƽ<EFBFBD>ڼ䣬<EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ź<EFBFBD>SDA<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȶ<EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : num
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : 0<EFBFBD><EFBFBD>1<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͳɹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>1<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʧ<EFBFBD>ܷ<EFBFBD><EFBFBD><EFBFBD>0
* <EFBFBD><EFBFBD>ע : <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>SCL=0,SDA=1
*******************************************************************************/
unsigned char I2cSendByte(unsigned char dat)
{
unsigned char a=0,b=0;//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>255<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ1us<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ255us<EFBFBD><EFBFBD>
for(a=0;a<8;a++)//Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>8λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>λ<EFBFBD><EFBFBD>ʼ
{
SDA=dat>>7; //<EFBFBD><EFBFBD>ʼ<EFBFBD>ź<EFBFBD>֮<EFBFBD><EFBFBD>SCL=0<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Կ<EFBFBD><EFBFBD><EFBFBD>ֱ<EFBFBD>Ӹı<EFBFBD>SDA<EFBFBD>ź<EFBFBD>
dat=dat<<1;
Delay10us();
SCL=1;
Delay10us();//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>>4.7us
SCL=0;
Delay10us();//ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>4us
}
SDA=1;
Delay10us();
SCL=1;
while(SDA)//<EFBFBD>ȴ<EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҳ<EFBFBD><EFBFBD><EFBFBD>ǵȴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>豸<EFBFBD><EFBFBD>SDA<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
{
b++;
if(b>200) //<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>2000usû<EFBFBD><EFBFBD>Ӧ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʧ<EFBFBD>ܣ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>Ӧ<EFBFBD>𣬱<EFBFBD>ʾ<EFBFBD><EFBFBD><EFBFBD>ս<EFBFBD><EFBFBD><EFBFBD>
{
SCL=0;
Delay10us();
return 0;
}
}
SCL=0;
Delay10us();
return 1;
}
/*******************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : I2cReadByte()
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : ʹ<EFBFBD><EFBFBD>I2c<EFBFBD><EFBFBD>ȡһ<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : dat
* <EFBFBD><EFBFBD>ע : <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>SCL=0,SDA=1.
*******************************************************************************/
unsigned char I2cReadByte()
{
unsigned char a=0,dat=0;
SDA=1; //<EFBFBD><EFBFBD>ʼ<EFBFBD>ͷ<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>֮<EFBFBD><EFBFBD>SCL<EFBFBD><EFBFBD><EFBFBD><EFBFBD>0
Delay10us();
for(a=0;a<8;a++)//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>8<EFBFBD><EFBFBD><EFBFBD>ֽ<EFBFBD>
{
SCL=1;
Delay10us();
dat<<=1;
dat|=SDA;
Delay10us();
SCL=0;
Delay10us();
}
return dat;
}
/*******************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : void At24c02Write(unsigned char addr,unsigned char dat)
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>24c02<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַд<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
*******************************************************************************/
void At24c02Write(unsigned char addr,unsigned char dat)
{
I2cStart();
I2cSendByte(0xa0);//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ
I2cSendByte(addr);//<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫд<EFBFBD><EFBFBD><EFBFBD>ڴ<EFBFBD><EFBFBD><EFBFBD>ַ
I2cSendByte(dat); //<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
I2cStop();
}
/*******************************************************************************
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : unsigned char At24c02Read(unsigned char addr)
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>ȡ24c02<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ<EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
* <EFBFBD><EFBFBD><EFBFBD><EFBFBD> : <EFBFBD><EFBFBD>
*******************************************************************************/
unsigned char At24c02Read(unsigned char addr)
{
unsigned char num;
I2cStart();
I2cSendByte(0xa0); //<EFBFBD><EFBFBD><EFBFBD><EFBFBD>д<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ
I2cSendByte(addr); //<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD>ȡ<EFBFBD>ĵ<EFBFBD>ַ
I2cStart();
I2cSendByte(0xa1); //<EFBFBD><EFBFBD><EFBFBD>Ͷ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ַ
num=I2cReadByte(); //<EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
I2cStop();
return num;
}