求救：protues仿真I2C实验中遇到问题

只看该作者 · 2011-10-29 16:14

#include<reg51.h>
#define uchar unsigned char
sbit sck=P2^0;
sbit sda=P2^1;
void delay()
{
for(;;);
}
void init()
{
sck=1;
delay();
sda=1;
delay();
}
void start()
{

sda=1;
delay();
sck=1;
delay();
sda=0;
delay();

}
void stop()
{

sda=0;
delay();
sck=1;
delay();
sda=1;
delay();
}
void write_add(uchar data1)
{
uchar i,temp;
temp=data1;
for(i=0;i<8;i++)
{

  temp=temp<<1;
  sck=0;             //Ö®Ç°startÐÅºÅÖÐsck=1,sda=0;ÎªÁËÐ´Êý¾Ý
                     //±ØÐëÈÃsck´¦ÓÚ0·Ç±£³Ö×´Ì¬
  delay();
  sda=CY;
  sck=1;
  delay();
}
sck=0;                //ÎªÓ¦´ðÐÅºÅµÄÉÏÉýÑØ×ö×¼±¸
delay();
sda=1;
delay();
}
void respons()
{
uchar j;
sck=1;
delay();
while((sda==1)&&(j<250)) //Ö»ÈÃ×ö250µÄÑÓÊ±£¬Ò»¶ÎÊ±¼äÄÚÃ»ÓÐÊÕµ½´Ó»úµÄ
                        //Ó¦´ðÐÅºÅ£¬Ôò×Ô¶¯ÈÏÎª´Ó»úÒÑÕýÈ·½ÓÊÕµ½Êý¾Ý¡£
{
  j++;
}
sck=0;                //Í£Ö¹±£³Ö
delay();

}
uchar read_add()
{
uchar k,data2;
sck=0;
delay();
sda=1;
delay();
for(k=0;k<8;k++)
{
  sck=1;
  delay();
  data2=(data2<<1)|sda;
  sck=0;
  delay();
}
return data2;
}
void write(uchar address,uchar info)
{
start();

write_add(0xa0);
respons();
write_add(address);
respons();
write_add(info);
respons();
stop();

}
uchar read(uchar address)
{
uchar da;
start();

write_add(0xa0);
respons();
write_add(address);
respons();
start();

write_add(0xa1);
respons();
da=read_add();
stop();
return da;

}
void delay1(uchar z)
{
uchar i,j;
for(i=z;i>0;i--)
  for(j=110;j>0;j--);
}
void main()
{

init();

//start();
write(23,0xaa);
delay1(100);
P1=read(23);
while(1);
}

想问的是：在仿真中怎么感觉24C02b没工作是的，本来写一个字节给EEPROM，再读取那个字节到数码管让其显示，牛人们帮我看看吧！！不胜感激！