justhomework/MCU/MCU_REAL _FINAL/eeprom.c

/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC89-90xx Series MCU ISP/IAP/EEPROM Demo -------------------*/
/* --- Mobile: (86)13922805190 -------------------------------------*/
/* --- Fax: 86-0513-55012956,55012947,55012969 ---------------------*/
/* --- Tel: 86-0513-55012928,55012929,55012966----------------------*/
/* --- Web: www.STCMCU.com -----------------------------------------*/
/* --- Web: www.GXWMCU.com -----------------------------------------*/
/* If you want to use the program or the program referenced in the  */
/* article, please specify in which data and procedures from STC    */
/*------------------------------------------------------------------*/

#include "reg51.h"
#include "intrins.h"
#include "eeprom.h"
#include "delay.h"

unsigned int bestScore[10]={0};

/*----------------------------
Disable ISP/IAP/EEPROM function
Make MCU in a safe state
----------------------------*/
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
}

/*----------------------------
Read one byte from ISP/IAP/EEPROM area
Input: addr (ISP/IAP/EEPROM address)
Output:Flash data
----------------------------*/
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 = 0x46;                //Send trigger command1 (0x46)
    IAP_TRIG = 0xb9;                //Send trigger command2 (0xb9)
    _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
}

/*----------------------------
Program one byte to ISP/IAP/EEPROM area
Input: addr (ISP/IAP/EEPROM address)
       dat (ISP/IAP/EEPROM data)
Output:-
----------------------------*/
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 = 0x46;                //Send trigger command1 (0x46)
    IAP_TRIG = 0xb9;                //Send trigger command2 (0xb9)
    _nop_();                        //MCU will hold here until ISP/IAP/EEPROM operation complete
    IapIdle();
}

/*----------------------------
Erase one sector area
Input: addr (ISP/IAP/EEPROM address)
Output:-
----------------------------*/
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 = 0x46;                //Send trigger command1 (0x46)
    IAP_TRIG = 0xb9;                //Send trigger command2 (0xb9)
    _nop_();                        //MCU will hold here until ISP/IAP/EEPROM operation complete
    IapIdle();
}

void addBest(unsigned int s)
{
	int i,j;
	for(i=0;i<10;i++)
		if(bestScore[i]<s)
		{
			for(j=9;j>i;j--)
				bestScore[j]=bestScore[j-1];
			
			bestScore[i]=s;
			saveBest();
			return;
		}
		
}

void saveBest()
{
		char i;
		IapEraseSector(IAP_ADDRESS);
		delayms(20);
	for(i=0;i++;i<10)
	{
		IapProgramByte(IAP_ADDRESS+2*i, bestScore[i]/256);
		delayms(15);
		IapProgramByte(IAP_ADDRESS+2*i+1, bestScore[i]%256);
		delayms(15);
	}
}

void readBest()
{
	char i;
	for(i=0;i++;i<10)
	{
		bestScore[i]=(unsigned int)IapReadByte(IAP_ADDRESS+2*i)*256 +(unsigned int)IapReadByte(IAP_ADDRESS+2*i+1);
	}
}