#include<reg51.h>
#define HIGHT 1
#define LOW 0
#define FALSE 0
#define TRUE 1
#define WRITE 0xa0
#define READ 0xa1
typedef unsigned char uchar;
sbit SCL=P2^1;
sbit SDA=P2^2;
void delay1()
{
;
}
void start(void)
{
SCL = HIGHT;
delay1();
SDA = LOW;
delay1();
SCL = LOW;
delay1();
}
void stop(void)
{
SDA = LOW;
delay1();
SCL = HIGHT;
delay1();
SDA = HIGHT;
delay1();
SCL = LOW;
delay1();
}
void init24xx(void)
{
SCL=LOW;
stop();
}
bit clock(void)
{
bit sample;
SCL=HIGHT;
delay1();
sample=SDA;
SCL=LOW;
delay1();
return(sample);
}
bit send(uchar I_data)
{
char i;
for(i=0;i<8;i++)
{
SDA=(bit)(I_data & 0x80);
I_data = I_data <<1;
clock();
}
SDA=HIGHT;
return(~clock());
}
uchar receive(void)
{
char I_data = 0;
char i;
for(i=0;i<8;i++)
{
I_data *= 2;
if (clock())
{
I_data++;
}
}
return(I_data);
}
/* void Ack(void)
{
SDA=LOW;
clock();
SDA=HIGHT;
}
*/
/* bit address(int Address)
{
uchar hbyte;
uchar lbyte;
lbyte = Address % 256;
hbyte=Address/256;
start();
if (send(WRITE | (hbyte<<1)))
return(send(lbyte));
else
return(FALSE);
}
*/
bit address(unsigned Address)
{
start();
if(send(WRITE))
return send(Address);
else
return (FALSE);
}
void wait_5ms(void)
{
int i;
for (i=0;i<1000;i++)
;
}
bit write( int Address,uchar buf)
{
if (address(Address) && send (buf))
{
stop();
wait_5ms();
return(TRUE);
}
else
return(FALSE);
}
uchar read (int Address)
{
char a;
address(Address);
start();
send (READ);
a=receive();
return(a);
}
