at24c02测试程序.c

51单片机试验板-sch-pcb-4.0M.zip

/************************************************
 AT24C02测试程序，向其中一个地址(0x66)写数据(0x06)，然后读取
数码管中显示出来
****************************************************/

#include<reg52.h>
#include<intrins.h>

#define uchar  unsigned char
#define uint   unsigned int


sbit LE1=P2^7;  
sbit A=P2^0;
sbit BB=P2^1;
sbit C=P2^2;

uchar tempt;
//uchar code table[]={0x3f,0x06,0x5b,0x4f,0x66,
 //                   0x6d,0x7d,0x07,0x7f,0x6f};

void delay(uint t)
{
   uchar j;
   for(;t>0;t--) 
    for(j=19;j>0;j--);
}

/*****AT24C02**************************************************************************************/
sbit AT24C02_SDA=P1^4;
sbit AT24C02_SCL=P1^3;

bit AT24C02_ACK;  //AT24C02 应答标志位

void  delayI2C();
void AT24C02Start();
void AT24C02Stop();
void AT24C02Respons();
void Init_AT24C02();
void AT24C02Write_Byte(uchar dat_I2C);
void AT24C02Write(uchar addrI2C,uchar datI2C);


void  delayI2C()
{
    _nop_();      //延时要大于4.7us
	_nop_();
	_nop_();
	_nop_();
	_nop_();
    _nop_();
}

void Init_AT24C02()  
{
  AT24C02_SDA=1;
  delayI2C();
  AT24C02_SCL=1;
  delayI2C();

}

void AT24C02Start()
{
    AT24C02_SDA=1;
	_nop_();
	AT24C02_SCL=1;
    delayI2C();
	AT24C02_SDA=0;
	delayI2C();
    AT24C02_SCL=0;
	_nop_();
	_nop_();

}

void AT24C02Stop()
{
   
    AT24C02_SDA=0;
	_nop_();
	AT24C02_SCL=1;
    delayI2C();
	AT24C02_SDA=1;
	delayI2C();

}

void AT24C02Respons()
{
  uchar i;
  AT24C02_SCL=1;
  delayI2C();
  while((AT24C02_SDA==1)&&(i<250)) 
	   i++;
  AT24C02_SCL=0;
  delayI2C();

} 

void AT24C02Write_Byte(uchar dat_I2C)
{
  uchar i,tempI2C;
  tempI2C=dat_I2C;
  for(i=0;i<8;i++)
  {
    tempI2C=tempI2C<<1;
	AT24C02_SCL=0;
    delayI2C();
	AT24C02_SDA=CY;
	delayI2C();
    AT24C02_SCL=1;
    delayI2C();
  }
   
  AT24C02_SCL=0;
  delayI2C();
  AT24C02_SDA=1;
  delayI2C();
}


unsigned char AT24C02Read_Byte()
{
    uchar i,k;
	k=0;
    AT24C02_SCL=0;
    delayI2C();
    AT24C02_SDA=1;
    delayI2C();
  for(i=0;i<8;i++)
  {
    AT24C02_SCL=1;
	delayI2C();
	k=(k<<1)|AT24C02_SDA;
    AT24C02_SCL=0;
    delayI2C();
  }
    AT24C02_SCL=0;
    delayI2C();
  return(k);
} 


void AT24C02Write(uchar addrI2C,uchar datI2C)
{
  AT24C02Start();
  AT24C02Write_Byte(0xa0);
  AT24C02Respons();
  AT24C02Write_Byte(addrI2C);
  AT24C02Respons();
  AT24C02Write_Byte(datI2C);
  AT24C02Respons();
  AT24C02Stop();

}

unsigned char AT24C02Read(uchar addrI2C)
{
  uchar ic;
  AT24C02Start();
  AT24C02Write_Byte(0xa0);
  AT24C02Respons();
  AT24C02Write_Byte(addrI2C);
  AT24C02Respons();

  AT24C02Start();
  AT24C02Write_Byte(0xa1);
  AT24C02Respons();
  ic=AT24C02Read_Byte();
  AT24C02Stop();
  return ic;

}

void Init()
{
  P1=0xff;
  P2=0xff;
  P0=0xff;
  


}

void Display()
{
  
   LE1=1;//选通hc573
 //分别依次选通数码管的位选端

 
   A=0;
   BB=0;
   C=0;
   P0=tempt;
delay(20);
   A=1;
   BB=0;
   C=0;
   P0=tempt;
 delay(20);
   A=0;
   BB=1;
   C=0;
   P0=tempt;
 delay(20);  
   A=1;
   BB=1;
   C=0;
   P0=tempt;
delay(20);
   A=0;
   BB=0;
   C=1;
   P0=tempt;
delay(20);
   A=1;
   BB=0;
   C=1;
   P0=tempt;
delay(20);
   A=0;
   BB=1;
   C=1;
   P0=tempt;
delay(20);
   A=1;
   BB=1;
   C=1;
   P0=tempt;
delay(20);
P0=0x00;
LE1=0;
   


}


void main()
{


  Init();
  Init_AT24C02();
  AT24C02Write(0x66,0x06);
  delay(1000);
  tempt=AT24C02Read(0x66);
  while(1)
    {
    Display();
 
    }
    

}