AT24C128 EEPROM的读写

记录AT24C128 eeprom的多字节读写

#define_EEPROM_DEBUG_LEVEL0

#if_EEPROM_DEBUG_LEVEL==1

#defineEEPROM_DEBUG(fmt,args...)do{

printf(fmt,##args);

}while(0)

#elif_EEPROM_DEBUG_LEVEL==2

#defineEEPROM_DEBUG(fmt,args...)do{

printf("%s:line:%d->",__FUNCTION__,__LINE__);

printf(fmt,##args);

}while(0)

#elif_EEPROM_DEBUG_LEVEL==0

#defineEEPROM_DEBUG(fmt,args...)

#else

#defineEEPROM_DEBUG(fmt,args...)

#endif

[cpp]view plaincopy

#defineAT24C128_PAGE_SIZE64

#defineAT24C128_PAGE_COUNT256

#defineAT24C128_BYTE_SIZE16*1024

#defineAT24C128_WADDR0xA0

#defineAT24C128_RADDR0xA1

写时序：

///

////wrtieeeprombypage

////

intwriteE2promByPage(u32startaddr,void*data,u32len){

intretry=0,pageCnt=0,i=0,j=0,k=0;

u32temp1=0,temp2=0,temp3=0,start=0,startPage;

u8*pBuf;

pBuf=(u8*)data;

temp1=startaddr%AT24C128_PAGE_SIZE;

temp2=len%AT24C128_PAGE_SIZE;

temp3=len/AT24C128_PAGE_SIZE;

startPage=startaddr/AT24C128_PAGE_SIZE;

if(temp1==0){

if(temp2!=0)pageCnt=temp3+2;

elsepageCnt=temp3+1;

}

else

{

if(temp2!=0)pageCnt=temp3+3;

elsepageCnt=temp3+2;

}

if(pageCnt>AT24C128_PAGE_COUNT)return-1;

EEPROM_DEBUG("pageCnt%drn",pageCnt);

for(i=0;i

//startsignal!!!

while(SCCB_Start()==0){

if(retry>100){

EEPROM_DEBUG("startfailrn");

return-1;

}

retry++;

}

if(i==0){

start=startaddr;

temp1=AT24C128_PAGE_SIZE-startaddr;

}

else{

start=(startPage+i)*AT24C128_PAGE_SIZE;

temp1=AT24C128_PAGE_SIZE;

}

EEPROM_DEBUG("start:%drn",start);

EEPROM_DEBUG("temp1:%drn",temp1);

//writeslaveaddr

SCCB_writeByte(AT24C128_WADDR);

if(SCCB_Wait_Ack()==0){

EEPROM_DEBUG("writeaddrfailrn");

SCCB_Stop();

goto_end;

}

//writepagehighaddr

SCCB_writeByte(start/256);

if(SCCB_Wait_Ack()==0){

EEPROM_DEBUG("writehighpageaddrfailrn");

SCCB_Stop();

goto_end;

}

//writepagelowaddr

SCCB_writeByte(start%256);

if(SCCB_Wait_Ack()==0){

EEPROM_DEBUG("writelowpageaddrfailrn");

SCCB_Stop();

goto_end;

}

//writedate

for(j=0;j

SCCB_writeByte(pBuf[k]);

//writeoperationneedslaveresponseack

if(SCCB_Wait_Ack()==0){

EEPROM_DEBUG("writedatafailrn");

SCCB_Stop();

goto_end;

}

else{

k++;

}

if(k==len){

SCCB_Stop();

goto_end;

}

}

EEPROM_DEBUG("page%dwritesuccessrn",i);

//stop

SCCB_Stop();

SCCB_Delay(SCL_TIME_US);

}

_end:

return k;