張明峰 :對現(xiàn)在有些年輕人的學習方法和效率感到悲哀!

讀寫片內(nèi)EEPROM數(shù)據(jù)區(qū)，每一本相關(guān)的數(shù)據(jù)手冊都有詳細的例程，抄上去就可以了。如果連抄上也不行，那你還有什么是可以的呢？

什么都想要現(xiàn)成的，自己一點主觀的進取心都沒有。你要用C寫程序，這當然是好事，可是連現(xiàn)成的匯編語句都無法用C語言復述一遍，那你還能用C寫出什么有用的代碼？

自己如果不清楚，就不要瞎說。什么“不是將wr置1，寫完后會自動將wr置1”：事實正好相反。

可能又要說是初學之類的借口了。那反問一句：這象認真學習的模樣嗎？

算了，附上一些代碼吧，僅供參考。

//=============================================================
//Write a byte of data into EEPROM memory
//Input:
//      eeData - data to be written
//      eeAddr - EEPROM memory address
//Return:
//      0 - successful
//      1 - data error
//      2 - time out
//=============================================================
unsigned char EE_Write(void)
{
unsigned char tmpData;

EEIF = 0;

EEDATA = eeData;   //data to write
EEADR  = eeAddr;   //adress to write
EEPGD  = 0;        //point to EE area
WREN   = 1;        //EE write enabled
GIE    = 0;        //no interrupt following
EECON2 = 0x55;     //password 55
EECON2 = 0xaa;     //password AA
WR     = 1;        //internal EE write cycle begin now
WREN   = 0;        //EE write can be disabled
GIE    = 1;        //interrupt could be enabled

timer  = 10;       //for backgound time-out control
do {
    asm("CLRWDT");
} while (EEIF==0 && timer!=0); //wait for EE write completed or time-out

if (EEIF==1 && timer!=0) {   //EE write completed normally
    tmpData = eeData;
    EE_Read();                //read back the written data
    if (tmpData == eeData)    //verify
       return(0);             //data is good
    else
       return(1);             //data is corrupted
} else
    return(2);                //WW write time out
}


//=============================================================
//Read a byte of data from EEPROM memory
//Input:
//      eeAddr - EEPROM memory address
//Output
//      eeData - data read
//=============================================================
void EE_Read(void)
{
EEDATA = 0xff;
EEADR  = eeAddr;
EEPGD  = 0;
RD     = 1;
eeData = EEDATA;
}