24C02 storage and reading

------Storage and reading of 24C02-----------
1. Use 24C02 to save the content of an array, and then read it out;
2. Be proficient in the operation of the IIC bus;
3. Start signal, stop signal, response and non-response signals, busy signal,
   read a byte data subroutine from the current position, write a byte subroutine from the current position,
   read a byte data subroutine from the specified position, and write a byte subroutine from the specified position.

4. Operation timing of various signals;
5. This program can also be used as a general subroutine of IIC;
6. This program has been tested on the Puzhong MCU training box;

*/

#include
#include
#define uint unsigned int
#define uchar unsigned char
unsigned char code dula[] = {0x3f,0x06,0x5b,0x4f,
     0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x40};
uchar wula[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf,0xbf,0x7f};
sbit sda=P2^1; //define serial data port
sbit scl=P2^0; //define serial clock port
void delay(uint z);
void start();
void stop();
void ack(bit aa);
uchar iic_readbyte();
void iic_writebyte(uchar date1);
void checkack();
uchar iic_addr_read(uchar addr);
void iic_addr_write(uchar addr,uchar date1);
void iic_addr_readn(uchar addr,uchar *s,uchar n);
void iic_addr_writen(uchar addr,uchar *s,uchar n);
void disp();
void nop5();
uchar write1[]={1,2,10,0,0,10,4,8,9,3};
uchar read1[]={0,0,0,0,0,0,0,0,0,0};
bit ack1;
uchar temp3;
//uchar flag1,flag2,num1,num2;
void main()
{
/* The first method to read and write multiple bytes from 24C02
uchar jj;
for(jj=0;jj<8;jj++)
{
iic_addr_write(jj+5,write1[jj]);
delay(10); //This delay is very important;
}

delay(10);
for(jj=0;jj<8;jj++)
{
read1[jj]=iic_addr_read(jj+5);
delay(10);//This delay is very important; 
} */
//
//The second method reads and writes multiple bytes from 24C02
iic_addr_writen(8,write1,8);
 delay(50);
 iic_addr_readn(8,read1,8);

 while(1)
 {disp();
 }
}

//-----5US delay subroutine--------------
void nop5()
{
_nop_();_nop_();_nop_();_nop_();_nop_();
}
//-------XMS delay subroutine----------------
void delay(uint z)
{
 uint x,y;
for(x=0;x for(y=0;y<112;y++);
}

//-------Start signal-----------
void start()
{
   sda=1;
   nop5();
   scl=1;
   nop5();
   sda=0;
   nop5();
   scl=0;
   nop5();
} 
//------Stop signal-----------
void stop()
{
sda=0;
nop5();
scl=1;
nop5();
sda=1;
nop5();
scl=1;
nop5();
} 
//=------Acknowledgement and non-acknowledgement signals---------
void ack(bit aa)
{
   scl=0;
   nop5();
   if(aa==1)
   sda=1;
   else
   sda=0;
   scl=1;
   nop5();
   scl=0;
   nop5(); 
}
//-------Busy signal------------
void checkack()
{ uchar i;   
   sda=1;
 scl=0;
 nop5();
 scl=1;
 nop5();
 while((sda==1)&&(i<250))
 {i++;}
 scl=0;
 nop5();
}
//-------Read a byte of data from the current position---------------

uchar iic_readbyte()
{  
  uchar i,temp;
  sda=1;
  scl=0;
  nop5();
  for(i=0;i<8;i++)
  {
   temp=temp<<1;
   scl=1;
   nop5();
   temp=temp|sda;
   scl=0;
  // nop5();
  // nop5();
   }
  scl=0;
  nop5();
  return(temp);
}
//-----Write a byte from the current position subroutine-------------
void iic_writebyte(uchar date1 )
{
 uchar i,temp;
 temp=date1;
 for(i=0;i<8;i++)
 {
   temp=temp<<1;
   sda=CY;
   scl=1;
   nop5();
   scl=0;
   //nop5();
  // nop5();
  }
  checkack();
  delay(1);
  scl=0;
  nop5();
}
//---Read a byte data subroutine from the specified position-----------------
uchar iic_addr_read(uchar addr)
{ uchar k2;
start();
iic_writebyte(0xa0);
delay(1);
iic_writebyte(addr);
delay(1);
start();
delay(10);
iic_writebyte(0xa1);
delay(10);
k2=iic_readbyte();
ack(1);
stop();
return(k2);
}

//---Write a byte from the specified position subroutine-------------
void iic_addr_write(uchar addr,uchar date1)
{
start();
iic_writebyte(0xa0);
delay(1);
iic_writebyte(addr);
delay(1);
iic_writebyte(date1);
delay(1);
stop();
}
//----------Write multiple bytes from the specified position subroutine-------------------
void iic_addr_writen(uchar addr,uchar *s,uchar n)
{
  uchar i;
  start();
  iic_writebyte(0xa0);
  //delay(1);
  iic_writebyte(addr);
 // delay(1);
  for(i=0;i    {
   iic_writebyte(*s);
   delay(20);//This delay must be longer, otherwise it is easy to make mistakes
   s++; //Because the device reacts slowly, give it enough time;
   }
   stop();
}
//-------Read multiple bytes from the specified position subroutine-------------------------
void iic_addr_readn(uchar addr,uchar *s,uchar n)
{
uchar i;
start();
iic_writebyte(0xa0);
//delay(1);
iic_writebyte(addr);
//delay(10);
start();
//delay(15);
iic_writebyte(0xa1);
//delay(10);
for(i=0;i  {
   *s=iic_readbyte();
   delay(1);
   ack(0);
   delay(20);//This delay must be longer, otherwise it is easy to make mistakes
   ++; //Because the device reacts slowly, give it enough time;
 }
*s=iic_readbyte();
ack(1);
stop();
}

//-----显示数据----------
void disp()
{uchar i;
 for(i=0;i<8;i++)
 {P0=dula[read1[i]];
  P1=wula[i];
    delay(3);
 P0=0;
     }
}