PIC16f877A read and write 24c01 program

#include

 
#include 
#define uchar unsigned char 
#define uint unsigned int 

static volatile unsigned char a CC  @ 0x20; //Send and receive data register 

static volatile bit acc0 @ (unsigned)&acc*8+0; //receive 
static volatile bit acc7 @ (unsigned)&acc*8+7; //send 
static volatile unsigned char err @ 0x21; // 
static volatile bit err0 @ (unsigned)&err*8+0; 
static volatile bit err3 @ (unsigned)&err*8+3; 
static volatile bit err6 @ (unsigned)&err*8+6; 
static volatile bit err7 @ (unsigned)&err*8+7; //acknowledgement bit temporary storage 

void Cack(); //acknowledgement bit check 
void Mnack(); //send non-acknowledgement bit 
void Mack(); //send acknowledgement bit 
void Stop(); //stop IC bus 
void Sta(); //start IC bus 
void Wrbyt (uchar x); //write one byte 
      uchar Rdbyt(); //read one byte 
void Rdnbyt(); //Read n data 
void Wrnbyt(uchar SLAwtemp ); //Write n data 
void initial(); //I/O initialization subroutine 
void  LED  (); // 
void delay(uint a); 
void delay1(); 


#define SCL RB4 //4 ;24C01-6 
#define SDA RB5 //5 ;24C01-5 
#define SCLIO TRISB4 //4 
#define SDAIO TRISB5 //5 
#define SLAW 0x0A0 //Addressing byte write 
#define SLAR 0x0A1 //Addressing byte read 
uchar numer=1; // Digital tube data temporary storage area 


unsigned char sun[10] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; 

//////////////24C01///////////////// 
//--------Check the acknowledge bit--------- 
void Cack() 
{  
SCL=1; 
SDAIO=1;//Input 1 
SCLIO=0; 
delay1(); 
err7=SDA;//c=1 error ERR 
SCL=0; 
} 
///--------Send non-acknowledge bit----------  
void Mnack() 
{ 
 SDA=1; 
 SCLIO=0; 
 SDAIO=0;//Output 
 SCL=1; 
 delay1(); 
 SCL=0; 
 SDA=0; 
} 
//-------Send acknowledge bit--------------- 
void Mack() 
{ 
SDA=0; 
SCLIO=0; 
SDAIO=0;//Output 
SCL=1; 
delay1(); 
SCL=0; 
SDA=1; 
} 
//--------Stop the IC bus--------------- 
void Stop() 
{ 
 SDAIO=0;//output 
 SCLIO=0; 
 SDA=0; 
 delay1(); 
 SCL=1; 
 delay1(); 
 SDA=1; 
 delay1(); 
} 
//--------;Start IC bus------------- 
void Sta() 
{  
SDAIO=0;//output 
SCLIO=0; 
SDA=1; 
delay1(); 
SCL=1; 
delay1(); 
SDA=0; 
delay1(); 
SCL=0; 
} 
//--------write one byte------------------------  
void Wrbyt(uchar x)  
{ 
uchar i; 
acc=x; 
SCLIO=0; 
SDAIO=0; 
for(i=8;i>0;i--) 
{ 
 SDA=acc7; 
 SCL=1; 
 delay1(); 
 SCL=0; 
 SDA=0;  
 acc=acc<<1; 
 } 
} 
//---------Read one byte----------------- 
uchar Rdbyt() 
{ 
uchar i; 
SCLIO=0; 
SDAIO=1;//;Inputfor 
(i=8;i>0;i--) 
 { 
 acc=acc<<1;//Receive data left shift register  
 SCL=1; 
 delay1(); 
 acc0=SDA; 
 SCL=0; 
 delay1(); 
 } 
 return(acc);  
}  
////---------Read n data---------------- 
void Rdnbyt() //Transmit data 
{ 
 Sta(); //Start IC bus  
 delay1(); 
 numer = Rdbyt();///Read one byte 
 delay1(); 
 Stop(); //Stop IC bus 
} 
//---------Write n data--------------- 
void Wrnbyt(uchar SLAwtemp ) 
{ 

 err7=1; 
 if(err7==1)///c=1E0,ERR 
 { 
 Sta(); //Start IC bus 
 delay1(); 
 Wrbyt(SLAwtemp); //Write a byte  
 delay1(); 
 Cack();//Check the acknowledge bit - 
 } 
 delay1(); 
 while(err7==1); 
 Stop(); //Stop IC bus 
} 

//*****************************************// 
//System Each I/O initialization subroutine 
void initial() 
{ 
 TRISC=0; 
 TR ISA =0; 
 TRISB1=1; 
 TRISB2=1; 
} 

//LED 

void LED () 
{ 
PORTA=0X1f; 
PORTC=sun[numer]; 
} 

void delay(uint a) 
{ 
uint b=100; 
while(a--) 
{ 
 while(b--); 
} 
} 

void delay1() 
{ 
NOP(); 
NOP(); NOP( 
); 
NOP(); 
} 

void main() 
{ 
initial();//system each I/O initialization subroutine 
LED(); 
delay(100); 
Wrnbyt (SLAW);//address byte write #0A0 
delay1(); 
Wrnbyt (0x05);//write address 0x05 
delay1(); 
Wrnbyt (0x06);//write data 0x06 
delay1(); 
Wrnbyt (SLAR);//address byte read #0A1 
delay1(); 
Wrnbyt (0x05);//read address 0x05 
delay1(); 
Rdnbyt (); //read data 
delay(5); 
while(1) 
{LED();} 
}