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使用51读写24c256的程序

/*the header files name is AT24C01-512.h

include AT24C01/01A/02/04/08/16/32/64/128/256/512

*the header files program's function is link exterior extend E2PROM

*the link chip's name is AT24C01A-512

* Debug frequency:22.1184MHz

*the program's synopsis as follows

* Author by:weiyi

* Establish on Date:27-12-2002

* Modified on Date:31-10-2002

* Edition NO.:V1.0

#define Wait_1us {_nop_();_nop_();}

#define Wait_2us {Wait_1us;Wait_1us;}

#define Sla_Wr 0xa0 /*0000 0 0 0 0*/

#define Sla_Rd 0xa1 /*0000 0 0 0 1*/

#define AT24C01 0x01

#define AT24C01A 0x02

#define AT24C02 0x03

#define AT24C04 0x04

#define AT24C08 0x05

#define AT24C16 0x06

#define AT24C32 0x07

#define AT24C64 0x08

#define AT24C128 0x09

#define AT24C256 0x0a

#define AT24C512 0x0b

#define Mem_Size AT24C256 //

01/01A/02/04/08/16/32/64/128/256/512

#define Chip_1 0x00 //本器件的器件地址，可以第一8个不同地

址的芯片使之能用同一段程序进行读写

sbit bSda =P3^3;

sbit bScl =P3^4;

bit bScan_Err;

unsigned char idata cShare_Buf[2]; //I2c read and write buffer

void Start_I2c(void);

void End_I2c(void);

unsigned char Scan_I2c();

void Send_I2c(unsigned char cData);

void Send_Ack(void);

void Send_Not_Ack(void);

void Write_Mem(unsigned char cMem_Size,cChips_Address,cData_Size,unsigned int

cStart_Address);

void Read_Mem(unsigned char cMem_Size,cChips_Address,cData_Size,unsigned int

cStart_Address);

/************Name:ScanI2c***********

Function:read 1byte from 24C01/512

NO.:1

Run time:79us 1=4+2us 0=5+1us f=111kbps/83.3Kbps

**********Function Start************/

void Start_I2c(void)

{

unsigned char /*idata*/ i;

bSda=bScl=1;

for(i=0;i<2;i++); //wait 7us

bSda=0;

for(i=0;i<2;i++); //wait 7us

bScl=0;

}

/**********Function End*************/

/************Name:ScanI2c***********

Function:read 1byte from 24C01/512

NO.:1

Run time:79us 1=4+2us 0=5+1us f=111kbps/83.3Kbps

**********Function Start************/

void End_I2c(void)

{

unsigned char /*idata*/ i;

bSda=0;

bScl=1;

for(i=0;i<2;i++); //wait 7us

bSda=1;

}

/**********Function End*************/

/************Name:ScanI2c***********

Function:read 1byte from 24C01/512

NO.:1

Run time:79us 1=3/5us 0=1/5us f=250/100kbps

**********Function Start************/

aaaaaaaaaaaaaaaaaaunsigned char Scan_I2c()

{

unsigned char /*idata*/ i,j;//IIC data

Stop_Dog; //喂

狗

bSda=1;

j=0;

for(i=0;i<8;i++)

{

bScl=1;

j<<=1;

Wait_2us;

j|=bSda;

万花茶//Scan 0 Scan 1

bScl=0;

Wait_2us;

}

return j;

}

/**********Function End*************/

/************Name:SendI2c***********

Function:Send 1byte to 24C01/512

NO.:2

Run time:82us 1=1/3us 0=3us f=250/100kbps

**********Function Start************/

void Send_I2c(unsigned char cData)弧形门

{

unsigned char /*idata*/ i;

Stop_Dog; //喂狗

for(i=0;i<8;i++)

{

bSda=(bit)(cData&0x80);

bScl=1;

cData<<=1;

Wait_2us;

bScl=0;

Wait_2us;

}

bSda=bScl=1; //检测ACK

for(i=0;(bSda==1)&&(bScan_Err==0);i++)

{

if(i==30)

bScan_Err=1; //如果101us没有响应就错误

Stop_Dog; //喂狗

}

bScl=0;

}

/**********Function End************/

/************Name:SendAck***********

Function:Send ack

NO.:3

Run time:10us+4us

**********Function Start************/

void Send_Ack(void)

{

unsigned char /*idata*/ i;

bSda=0;

bScl=1;

for(i=0;i<2;i++); //wait 8us

bScl=0;靠背轮

bSda=1;

u型卡子}

/**********Function End*************/

/************Name:SendNotAck***********

Function:send not ack

NO.:4

Run time:10us+4us

**********Function Start************/

void Send_Not_Ack(void)

{

unsigned char /*idata*/ i;

bScl=bSda=1;

for(i=0;i<2;i++); //wait 8us

bScl=0;

}

/**********Function End*************/

/************Name:WriteMem***********

Function:write data to 24C01/512

NO.:5

Run time:80us(1byte)*cData_Size+

**********Function Start************/

void Write_Mem(unsigned char cMem_Size,cChips_Address,cData_Size,unsigned int

>动态投影灯

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