MCU simulates I2C bus to read and write EEPROM (24CXX) program 1

Circuit:

Note: I use the LEDs on port P2 to detect which step the circuit has reached. I think it is very clear at a glance.

program:

#include
#define unit unsigned int
#define uchar unsigned char
int ok;
sbit scl=P0^0;          
sbit sda=P0^1;
sbit led0=P2^0;
sbit led1=P2^1;
sbit led2 =P2^2;
sbit led3=P2^3;
sbit led4=P2^4;
sbit led5=P2^5;
sbit led6=P2^6;
sbit led7=P2^7;

delay(void) //delay
{ 
  int i;
  led1=1;
  for(i=0;i<1;i++) led1=0;
}

start(void) //start
{
  sda=1;
  scl=1;
  delay();
  sda=0;
  delay();
  scl=0;
  led0=0;
}

stop(void) //stop
{
  sda=0;
  scl=1;
  delay();
  sda=1;
  delay();
  scl=0;
}

checkanswer(void) //check answer
{
  sda=1;
  scl=1;
  if(sda==1)
  {
  F0=1;
  led7=0;
  }
  scl=0; 
  led3=0;
}

sendabyte(int temps) //send a byte
{
  uchar n=8;
  while(n--)
  {
    led2=1;
    if((temps&0x80)==0x80)
 {
   sda=1;
   scl=1;
   delay();
   scl =0;
 }
 else
 {
   sda=0;
   scl=1;
   delay();
   scl=0;
 }
 temps=temps<<1;
 led2=0;
  }
}

reciveabyte() //recive a byte
{
  uchar n=8,tempr;
  while(n--)
  { //uchar idata *abyte
   scl=1;
 tempr=tempr<<1;
 if(sda==1)
   tempr=tempr |0x01;
 else
   tempr=tempr&0xfe;
 scl=0;
  }
  ok=tempr;
  return(ok);
}

main(void) //MAIN
{
start();

sendabyte(0xa0);
checkanswer();
if(F0==1) return;

sendabyte(0x00);
checkanswer();
if(F0==1) return;

sendabyte(0x11);
checkanswer();
if(F0==1) return;
/*-----------------------*/
start();

sendabyte(0xa0);
checkanswer();
if(F0==1) return;

sendabyte(0x00);
checkanswer();
if(F0==1) return;

start();

sendabyte(0xa1);
checkanswer();
if(F0==1) return;

reciveabyte();
if(ok==0x11) led6=0;
stop();
}

illustrate:

1. Before writing the driver, it is recommended to understand the read and write timing of the 24CXX series chips. The Chinese information can be downloaded from my network disk. The free registration download link is: http://wdpvip.qupan.com/6293600.html

2. Program function: first write a data 0x11 at address 0x00, and then read it out. If the written data is the same as the read data, LED6 will be lit.