常用程序模塊備份（一）：STC12C5A60S2自帶EEPROM

其實(shí)早就應(yīng)該養(yǎng)成一個(gè)良好的程序備份習(xí)慣，現(xiàn)在放在這里即方便自己隨時(shí)在其他地方調(diào)用、備份，也可以幫到需要的人。
對(duì)于stc自帶EEPROM來(lái)說(shuō)，用起來(lái)唯一不太方便的地方就是每次修改任何一個(gè)字節(jié)需要將整個(gè)扇區(qū)都擦除才能修改，所以每次修改都要講整個(gè)扇區(qū)內(nèi)容用數(shù)組全部讀出緩存起來(lái)，進(jìn)行擦除操作，講需要修改的內(nèi)容在相應(yīng)的數(shù)組位置修改好，再講整個(gè)數(shù)組內(nèi)容重新寫(xiě)入到EEPROM里，頭文件中我已經(jīng)將接口函數(shù)都寫(xiě)好啦。直接調(diào)用就行，不用考慮任何問(wèn)題，而且地址也直接從0開(kāi)始到 USING_CHAR_NUM-1（USING_CHAR_NUM最大可到512）

EEPROM.h-----------------------------------------------------------------------------------------------------
#ifndef __EEPROM_H__
#define __EEPROM_H__

unsigned char EepromReadByte(unsigned char addr);

void EepromWriteByte(unsigned char addr, unsigned char dat);
#endif

EEPROM.c-----------------------------------------------------------------------------------------------------
#include "intrins.h"
typedef unsigned char BYTE;
typedef unsigned int WORD;

sfr  IAP_DATA      =   0xC2;               //Flash data register
sfr  IAP_ADDRH     =   0xC3;              //Flash address HIGH
sfr  IAP_ADDRL     =   0xC4;              //Flash address LOW
sfr  IAP_CMD       =   0xC5;              //Flash command register
sfr  IAP_TRIG      =   0xC6;              //Flash command trigger
sfr  IAP_CONTR     =   0xC7;              //Flash control register

#define   CMD_IDLE      0                 //Stand-By
#define   CMD_READ      1                 //Byte-Read
#define   CMD_PROGRAM   2                 //Byte-Program
#define   CMD_ERASE     3                 //Sector-Erase

#define   ENABLE_IAP    0x82              //if SYSCLK<20MHz
//Start address for STC12C5A60S2 series EEPROM
#define   IAP_ADDRESS   0x0000
#define      USING_CHAR_NUM   11

void IapIdle();
BYTE IapReadByte(WORD addr);
void IapProgramByte(WORD addr, BYTE dat);
void IapEraseSector(WORD addr);

unsigned char EepromReadByte(unsigned char addr)
{
    return(IapReadByte(addr));
}

void EepromWriteByte(unsigned char addr, unsigned char dat)
{
    unsigned char eepromBUF[USING_CHAR_NUM];
    unsigned char i;
    for(i=0; i< USING_CHAR_NUM; i++)
    {
        eepromBUF[IAP_ADDRESS+i] = IapReadByte(IAP_ADDRESS+i);  
    }
    if(addr < USING_CHAR_NUM)
    {
        eepromBUF[IAP_ADDRESS+addr] = dat;
        IapEraseSector(IAP_ADDRESS);

        for(i=0; i< USING_CHAR_NUM; i++)
        {
            IapProgramByte(IAP_ADDRESS+i, eepromBUF[IAP_ADDRESS+i]);  
        }
    }
}
//void EepromInit(void)
//{
//    unsigned int tmp = 0;
//    _nop_();
//    _nop_();
//    _nop_();
//    tmp = IapReadByte(IAP_ADDRESS+1);
//    tmp = (tmp << 8) + IapReadByte(IAP_ADDRESS);
//    if(0xffff == tmp)
//    {
//        IapProgramByte(IAP_ADDRESS,(BYTE)0);
//        IapProgramByte(IAP_ADDRESS+1,(BYTE)0);
//        tmp = 0;  
//    }
//    tmp++;
//    IapEraseSector(IAP_ADDRESS);
//    IapProgramByte(IAP_ADDRESS,(BYTE)tmp );
//    IapProgramByte(IAP_ADDRESS+1,(BYTE)(tmp>>8) );
//      
//}

void IapIdle()
{
      IAP_CONTR = 0;      //Close IAP function
      IAP_CMD = 0;            //Clear command to standby
      IAP_TRIG = 0;                      //Clear trigger register
      IAP_ADDRH = 0x80;                 //Data ptr point to non-EEPROM area
      IAP_ADDRL = 0;                     //Clear IAP address to prevent misuse
}

BYTE IapReadByte(WORD addr)
{
      BYTE dat;                          //Data buffer
      IAP_CONTR = ENABLE_IAP;   //Open IAP function, and set wait time
      IAP_CMD = CMD_READ;        //Set ISP/IAP/EEPROM READ command
      IAP_ADDRL = addr;                 //Set ISP/IAP/EEPROM address low
      IAP_ADDRH = addr >> 8;      //Set ISP/IAP/EEPROM address high
      IAP_TRIG = 0x5a;                //Send trigger command1 (0x5a)
      IAP_TRIG = 0xa5;                  //Send trigger command2 (0xa5)
      _nop_();  _nop_();                          //MCU will hold here until ISP/IAP/EEPROM
      //operation complete
      dat = IAP_DATA;            //Read ISP/IAP/EEPROM data
      IapIdle();                         //Close ISP/IAP/EEPROM function
      return dat;                        //Return Flash data
}

void IapProgramByte(WORD addr, BYTE dat)
{
  IAP_CONTR = ENABLE_IAP;         //Open IAP function, and set wait time
      IAP_CMD = CMD_PROGRAM;     //Set ISP/IAP/EEPROM PROGRAM command
      IAP_ADDRL = addr;                 //Set ISP/IAP/EEPROM address low
      IAP_ADDRH = addr >> 8;            //Set ISP/IAP/EEPROM address high
      IAP_DATA = dat;                  //Write ISP/IAP/EEPROM data
      IAP_TRIG = 0x5a;                   //Send trigger command1 (0x5a)
      IAP_TRIG = 0xa5;                   //Send trigger command2 (0xa5)
      _nop_();   _nop_();                        //MCU will hold here until ISP/IAP/EEPROM
      //operation complete
      IapIdle();
}

void IapEraseSector(WORD addr)
{
      IAP_CONTR = ENABLE_IAP;  //Open IAP function, and set wait time
      IAP_CMD = CMD_ERASE;      //Set ISP/IAP/EEPROM ERASE command
      IAP_ADDRL = addr;                //Set ISP/IAP/EEPROM address low
      IAP_ADDRH = addr >> 8;         //Set ISP/IAP/EEPROM address high
      IAP_TRIG = 0x5a;                   //Send trigger command1 (0x5a)
      IAP_TRIG = 0xa5;                   //Send trigger command2 (0xa5)
      _nop_();  _nop_();                         //MCU will hold here until ISP/IAP/EEPROM
      //operation complete
      IapIdle();
}