ATmega8535L Eeprom Example Program

ATmega8535L Eeprom Example Program

//***************ICCAVR V6.30 compiled*****************// 

#include                 

#define uchar unsigned char 
#define uint unsigned int 

//digital tube font table, corresponding to 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F // 
uchar Table[16]={0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 
                 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79, 0x71}; 
uchar Read_Data[4]; //define read data 

void DelayMs(uint i) //Ms level delay, parameter i is the delay time 
{uint j; 
 for(;i!=0;i--) 
  {for(j=8000;j!=0;j--) {;}} } 
void 

Display(uchar *p) //Dynamic display function, parameter p is the name of the array to be displayed 
{uchar i,sel=0x01;            
 for(i=0;i<4;i++) 
  {PORTA=sel; //Select the rightmost digital tubePORTC 
   =0xff-Table[p[i]]; //Send font code 
   DelayMs(1); //Display delay     
   sel=sel<<1; //Shift to display the previous bit 
  } 
} 

void Init_IO(void) //Initialize I/O port 
{DDRA=0xff; //Set port A to push-pull 1 output 
 PORTA=0xff; 
 DDRC=0xff; //Set port C to push-pull 1 output              
 PORTC=0xff; 
} 

void Write_EEPROM(uchar Data,uint Address) 
{if(EECR&0x20) DelayMs(4); 
 EEARH=Address>>8; 
 EEARL=Address&0x00ff; 
 EEDR=Data; 
 EECR=EECR|0x04; 
 EECR=EECR|0x02; 
 DelayMs(4); 
} 

uchar Read_EEPROM(uint Address) 
{uchar i; 
 if(EECR&0x01) DelayMs(4); 
 EEARH=Address>>8; 
 EEARL=Address&0x00ff; 
 EECR=EECR|0x01; 
 DelayMs(5); 
 i=EEDR; 
 return(i); 
} 

void main(void) 
{uchar i; 
 Init_IO(); //Initialize I/O port 
 PORTA=0xff; //Light up to test all digital tubes 
 PORTC=0x00;    
 DelayMs(300); //Delay 
 PORTC=0xff; //Turn off all digital tubes 
 for(i=0;i<4;i++) 
    Write_EEPROM(5*i,i); 
 for(i=0;i<4;i++) 
    Read_Data[i]=Read_EEPROM(i); 
 while(1) 
 Display(Read_Data); 
}