how to send and receive 2digit data from eeprom 24c02 from array

[vignesh]

how to send and receive 2digit data from eeprom 24c02 from array

 

dis is the program which is i got through the website

 

#include<reg51.h>
#include<intrins.h>   //For using [_nop_()]
sbit sda=P1^0;
sbit scl=P1^1;
sbit led=P0^3;
bit ack;
sbit led1=P0^1;
sfr lcd_data_pin=0xA0;//p2 port
sfr output=0x80;//p0 port
sbit rs=P3^0;
sbit rw=P3^1;
sbit en=P3^6;
unsigned char reead,write,write2,i,j;
unsigned int temp;
void delay(unsigned int count)
{
 int i,j;
 for(i=0;i<count;i++)
  for(j=0;j<1275;j++);
}
void lcd_command(unsigned char comm)
{
 lcd_data_pin=comm;
 en=1;
 rs=0;
 rw=0;
 delay(1);
 en=0;
}
void lcd_data(unsigned char disp)
{
 lcd_data_pin=disp;
 en=1;
 rs=1;
 rw=0;
 delay(1);
 en=0;
}
lcd_dataa(unsigned char *disp)
{
 int x;
 for(x=0;disp[x]!=0;x++)
 {
  lcd_data(disp[x]);
 }
}
void lcd_ini()
{
 lcd_command(0x38);    // for using 8-bit 2 row LCD
 delay(5);
 lcd_command(0x0F);        // for display on, cursor blinking
 delay(5);
 lcd_command(0x80);
 delay(5);
}
void aknowledge()   //acknowledge condition
{
 scl=1;
 _nop_();
 _nop_();
 scl=0;
}
void start()  //start condition
{
 sda=1;
 scl=1;
 _nop_();         //No operation
 _nop_();
 sda=0;
 scl=0;
}
void stop()   //stop condition
{
 sda=0;
 scl=1;
 _nop_();
 _nop_();
 sda=1;
 scl=0;
}
void send_byte(unsigned char value) //send byte serially
{
 unsigned int i;
 unsigned char send;
 send=value;
 for(i=0;i<8;i++)
 {
  sda=send/128;   //extracting MSB
  send=send<<1;   //shiftng left
  scl=1;
  _nop_();
  _nop_();
  scl=0;
 }
   ack=sda;     //reading acknowledge
   sda=0;
}
unsigned char read_byte()   //reading from EEPROM serially
{
 unsigned int i;
 sda=1;
 reead=0;
 for(i=0;i<8;i++)
 {
  reead=reead<<1;
  scl=1;
  _nop_();
  _nop_();
  if(sda==1)
   reead++;
  scl=0;
 }
 sda=0;
 return reead;    //Returns 8 bit data here
}  
void save()     //save in EEPROM
{ 
 start();
 send_byte(0xA0);      //device address
 aknowledge();
 send_byte(0x00);      //word address
 aknowledge();
 send_byte(5);
 aknowledge();
 send_byte(65);
 aknowledge();
 stop();         
 if(ack==0)
 {
  led1=1;
  delay(100);
  led1=0;
  delay(100);
  lcd_command(0x86);
  lcd_data(‘5’);
  lcd_command(0x87);
  lcd_data(‘A’);
 }
 else
  led1=1;
 aknowledge();
}
void Read()
{
 start();
 send_byte(0xA0);
 aknowledge();
 send_byte(0x00);
 aknowledge();
 start();
 send_byte(0xA1);      //device address
 aknowledge();
 i=read_byte();
 aknowledge();
 j=read_byte();
 aknowledge();
 stop();
 if(i<=55)
 {
  led=0;
  delay(100);
  led=1;
  delay(100);
  write=i+48;
  lcd_command(0xC6);
  lcd_data(write); 
 }
 else
  led=1;
 if(j<=55)
 {
  lcd_command(0xC7);
  write=j+48;
  lcd_data(write);
 }
 aknowledge();
}

void main()
{
 lcd_ini();
 lcd_dataa(“Sent :”);
 lcd_command(0xC0);
 lcd_dataa(“Read :”);
 temp=0;
 while(1)
 {
  save();
  Read();
 }
}

 

please help me to send a array data like dis

 

array[2]=”12″

[amardeep]

hi 
you have to send data in 8 bit pattren like 0x95 in hex number system

 

 

Example :

unsigned char array[5]={5,10,8,3}

 

 

void save()     //save in EEPROM
{ 
 start();
 send_byte(0xA0);      //device address
 aknowledge();
 send_byte(0x00);      //word address
 aknowledge();
 send_byte(array[0]);
 aknowledge();
 send_byte(array[1]);
 aknowledge();

 send_byte(array[2]);
 aknowledge();

 send_byte(array[3]);
 aknowledge();
 stop();           // don’t forget to stop the communication

this way data will be write in sequential manner

Hope it will help U  

[vignesh]

thank u very much!!! its working

[Author]

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