eeprom.c

程序是基于STC89C58的点阵屏显示程序

#include"reg52.h"

		 

unsigned char read(unsigned char ADDRH,unsigned char ADDRL);
void write(unsigned char ADDRH,unsigned char *p,unsigned char k);
void erase(unsigned char ADDRH);

void Delay0()
{
	unsigned char j;
		for(j=0;j<0xff;j++);
}

///////////////////eprom start
void write_eight_byte(unsigned char *p,unsigned char ADDRH)
{    
	unsigned char i;
//	EA=0;  									
	erase(ADDRH);			 //擦除
	ISP_ADDRH=ADDRH;                                    		
	ISP_ADDRL=0x00;

	ISP_DATA=0x3f;
    ISP_CONTR=0x8b;	         					
	ISP_CMD=2;																							
	ISP_TRIG=0x46;									   		//触发ISP/IAP 	
	ISP_TRIG=0xb9;	
	ISP_ADDRL++; 											//地址+1；  		
	Delay0();
    for(i=0;i<8;i++)                                    
	{	
		ISP_DATA=p[i];
        ISP_CONTR=0x8b;	         					
		ISP_CMD=2;																							
		ISP_TRIG=0x46;									   		//触发ISP/IAP 	
		ISP_TRIG=0xb9;	
		ISP_ADDRL++; 											//地址+1；  		
		Delay0();
	}
//	EA=1;
}

unsigned char read(unsigned char ADDRH,unsigned char ADDRL)   	//ADDRH 范围0x28-0x2f  ADDL"0-255"
{      
	ISP_ADDRH=ADDRH; 											//ISP/IAP控制寄存器
 	ISP_ADDRL=ADDRL;	
	ISP_CONTR=0x8b;	
	ISP_CMD=1;													//送字节读命令
	ISP_TRIG=0x46;											
	ISP_TRIG=0xb9;												//触发ISP/IAP 
    Delay0();
	return ISP_DATA;
}



/***********擦除**************/	  
void erase(unsigned char ADDRH)                                 
{
	unsigned char i=0;
	for(i=0;i<9;i++)
	{
		ISP_ADDRH=ADDRH;
		ISP_ADDRL=i;
		ISP_CONTR=0x8b;	
		ISP_CMD=3;
		ISP_TRIG=0x46;												//触发ISP/IAP 
		ISP_TRIG=0xb9;											
    	Delay0();
	}
}

unsigned char read_eight_byte(unsigned char *p,unsigned char ADRH)
{
	unsigned char i=0,j=0; 
//	EA=0;
	if(read(ADRH,0)!=0x3f)
	{
		for(i=0;i<4;i++)
		{
			*(p+i*2)=0xa1;
			*(p+i*2+1)=0xa1;
		}
		return(0);
	}
	Delay0();
	for(i=0;i<4;i++)
	{
		*(p+i*2)=read(ADRH,i*2+1);
		*(p+i*2+1)=read(ADRH,i*2+2);
		if(*(p+i*2)!=0xa1||*(p+i*2+1)!=0xa1)	
					j++;
		Delay0();
	}
//	EA=1;
	return(j);
}