#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit SDA=P2^0;
sbit SCL=P2^1;
void delay()
{ ; ; }
void delay1(uint i)
{
uchar j;
for(i;i>0;i--)
for(j=113;j>0;j--);
}
void start()
{
SDA=1;
delay();
SCL=1;
delay();
SDA=0;
delay();
}
void stop()
{
SDA=0;
delay();
SCL=1;
delay();
SDA=1;
delay();
}
void init()
{
SDA=1;
delay();
SCL=1;
delay();
}
void ack()
{
uchar i=0;
SCL=1;
delay();
while((SDA==1)&&(i<250))i++;
SCL=0;
delay();
}
void writebyte(uchar date)
{
uchar i,temp;
temp=date;
for(i=0;i<8;i++)
{
temp=temp<<1;
SCL=0;
delay();
SDA=CY;
delay();
SCL=1;
delay();
}
SCL=0;
delay();
SDA=1;
delay();
}
uchar readbyte()
{
uchar i,k;
SCL=0;
delay();
SDA=1;
delay();
for(i=0;i<8;i++)
{
SCL=1;
delay();
k=(k<<1|SDA);
SCL=0;
delay();
}
return k;
SDA=1;
delay();
}
void writeadd(uchar address,uchar data1)
{
start();
writebyte(0x90);
ack();
writebyte(address);
ack();
writebyte(data1);
ack();
stop();
}
uchar readadd(uchar address)
{
uchar data1;
start();
writebyte(0x90);
ack();
writebyte(address);
ack();
start();
writebyte(0x91);
ack();
data1=readbyte();
ack();
stop();
return data1;
}
main()
{
unsigned char i,j=0x00;
init();
while (1)
{
for(i=0;i<255;i++)
writeadd(1,j++);
for(i=0;i<255;i++)
writeadd(1,j--);
}
}
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