AT24C01-AT24C256通用源程序（C51）

据说是AT24C01-AT24C256通用源程序，但按照我的经验，这个源程序仅适合AT24C04-AT24C256。

/*Sample:

/*main(){...

/*ReadMem(l,x,y);/*读。l为本次访问的器件号，在宏定义时分配不同芯片的不同

器件号，

x为本次欲读出的字节数；y为本次读数的起始地址*/

/*...

/*WriteMem(l,x,y);/*写。l为本次访问的器件号，在宏定义时分配不同芯片不同

的器件号，

x为本次欲写入的字节数；y为本次写数的起始地址，

注：当心页写入的地址规律，即页地址在同一页内滚动;否则会出现页溢出*/

/*}*/

#defineWait_1us{_nop_();_nop_();}

#defineWait_2us{Wait_1us;Wait_1us;}

#defineSla_Wr0xa0/*00000000*/

#defineSla_Rd0xa1/*00000001*/

#defineAT24C010x01

#defineAT24C01A0x02

#defineAT24C020x03

#defineAT24C040x04

#defineAT24C080x05

#defineAT24C160x06

#defineAT24C320x07

#defineAT24C640x08

#defineAT24C1280x09

#defineAT24C2560x0a

#defineAT24C5120x0b

#defineMem_SizeAT24C256//01/01A/02/04/08/16/32/64/128/256/512

#defineChip_10x00//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

sbitbSda=P3^7;

sbitbScl=P3^6;

bitbScan_Err;

unsignedcharidatacShare_Buf[8]={0,1,2,3,4,5,6,7};//I2creadandwritebuffer

voidStart_I2c(void);

voidEnd_I2c(void);

unsignedcharScan_I2c();

voidSend_I2c(unsignedcharcData);

voidSend_Ack(void);

voidSend_Not_Ack(void);

voidWrite_Mem(unsignedcharcMem_Size,cChips_Address,cData_Size,unsignedint

cStart_Address);

voidRead_Mem(unsignedcharcMem_Size,cChips_Address,cData_Size,unsignedint

cStart_Address);

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

Function:read1bytefrom24C01/512

NO.:1

Runtime:79us1=4+2us0=5+1usf=111kbps/83.3Kbps

**********FunctionStart************/

voidStart_I2c(void)

{

unsignedchar/*idata*/i;

bSda=bScl=1;

for(i=0;i<2;i++);//wait7us

bSda=0;

for(i=0;i<2;i++);//wait7us

bScl=0;

}

/**********FunctionEnd*************/

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

Function:read1bytefrom24C01/512

NO.:1

Runtime:79us1=4+2us0=5+1usf=111kbps/83.3Kbps

**********FunctionStart************/

voidEnd_I2c(void)

{

unsignedchar/*idata*/i;

bSda=0;

bScl=1;

for(i=0;i<2;i++);//wait7us

bSda=1;

}

/**********FunctionEnd*************/

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

Function:read1bytefrom24C01/512

NO.:1

Runtime:79us1=3/5us0=1/5usf=250/100kbps

**********FunctionStart************/

unsignedcharScan_I2c()

{

unsignedchar/*idata*/i,j;//IICdata

bSda=1;

j=0;

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

{

bScl=1;

j<<=1;

Wait_2us;

j|=bSda;

//Scan0Scan1

bScl=0;

Wait_2us;

Wait_2us;

}

returnj;

}

/**********FunctionEnd*************/

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

Function:Send1byteto24C01/512

NO.:2

Runtime:82us1=1/3us0=3usf=250/100kbps

**********FunctionStart************/

voidSend_I2c(unsignedcharcData)

{

unsignedchar/*idata*/i;

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

{

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

bScl=1;

cData<<=1;

Wait_2us;

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

}

bScl=0;

}

/**********FunctionEnd************/

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

Function:Sendack

NO.:3

Runtime:10us+4us

**********FunctionStart************/

voidSend_Ack(void)

{

unsignedchar/*idata*/i;

bSda=0;

bScl=1;

for(i=0;i<2;i++);//wait8us

bScl=0;

bSda=1;

}

/**********FunctionEnd*************/

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

Function:sendnotack

NO.:4

Runtime:10us+4us

**********FunctionStart************/

voidSend_Not_Ack(void)

{

unsignedchar/*idata*/i;

bScl=bSda=1;

for(i=0;i<2;i++);//wait8us

bScl=0;

}

/**********FunctionEnd*************/

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

Function:writedatato24C01/512

NO.:5

Runtime:80us(1byte)*cData_Size+

**********FunctionStart************/

voidWrite_Mem(unsignedcharcMem_Size,cChips_Address,cData_Size,unsignedintcStart_Address)

{

unsignedchar/*idata*/i,cAddress[2];//0-L;1-H

bScan_Err=0;

cAddress[0]=cStart_Address;

cStart_Address>>=8;

cAddress[1]=cStart_Address;

i=Sla_Wr;

i|=cChips_Address;

if(cMem_Size==AT24C256)

i&=0xf7;

Start_I2c();

Send_I2c(i);//SLA:1010xxx0

if(cMem_Size==AT24C256)//1-16用1个字节地址，32-512用2个字节地址，匹配地址AT24C32、64

Send_I2c(cAddress[1]);//先发送高字节地址

Send_I2c(cAddress[0]);//如果是双字节地址则为低地址否则为高地址

for(i=0;(bScan_Err==0)&&(i!=cData_Size);i++)

Send_I2c(cShare_Buf[i]);//写一个字节数据

End_I2c();

}

/**********FunctionEnd*************/

/************Name:ReadMem***********

Function:Readdatafrom24C01/512

NO.:6

Runtime:80us(1byte)*cData_Size+

**********FunctionStart************/

voidRead_Mem(unsignedcharcMem_Size,cChips_Address,cData_Size,unsignedintcStart_Address)

{

unsignedchar/*idata*/i,cAddress[2];

bScan_Err=0;