51学习库（9）--EEPROM

学过51单片机的回过头来都会觉得51还是比较简单的，在此我将贴出在我的学习过程中，把对各种外设所进行的操作，封装成函数库的形式，以供新手学习。

注：使用的单片机是stc12c5a60s2，该系列单片机属于加强51，在运行速度上是普通51的8-12倍，有关时序的操作需要加以注意。
注2：使用示例：

void main()
{
    unsigned int i;
    unsigned char dataNum;

    Delay(10);
    IapEraseSector(IAP_ADDRESS);    //擦除eeprom扇区，512字节
//  for(i=0; i<512; i++)
//  {
//      if(IapReadByte(IAP_ADDRESS+i)!= 0xff)   //是否擦除成功
//         goto Error;
//  } 
//  P1 = 0xfc;
//  Delay(10);
    for(i=0; i<512; i++)
    {
        IapProgramByte(IAP_ADDRESS+i, (unsigned char)i);    //写入数据
    }
//  P1 = 0xf8;
//  Delay(10);
//  for(i=0; i<512; i++)
//  {
//      if(IapReadByte(IAP_ADDRESS+i)!=(unsigned char)i)    //验证数据是否正确
//          goto Error;
//  }
//  P1 = 0xf0;
//  while(1);
//  Error:
//      P1 &= 0x7f;
//      while(1);
    dataNum = EepromReadByte(IAP_ADDRESS+2);   //读取曾经写入的数据
    while(1)
    {
        displayInteger(dataNum);
    }
}

申明：本系列全部例程通过单片机开发板，实验亲测有效！

/* eeprom */
/*
*-------文档说明--------
*说明：eeprom.h文件实现了对stc12c5a60s2单片机内部eeprom的使用
*作者：Brunon
*创建日期：2017.5.5
*备注：根据stc12c5a60s2手册创建
*/
#include <reg52.h>

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()
{
    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
}

unsigned char IapReadByte(unsigned int addr)
{
    unsigned char 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
}


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 IapProgramByte(unsigned int addr, unsigned char 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(unsigned int 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();
}

void Delay(unsigned char n)
{
    unsigned int x;
    while(n--)
    {
        x=0;
        while(++x);
    }
}