eeprom interfacing with 8051

[rohit]

Hello sir ,i have taken a code from your site for writing and reading from eeprom and displaying it on lcd,but the code is not working in proteus.it’s not showing the result.can u please tell me what is going wrong.

=>i am usnig 24c02b ic for eeprom

=>if i want to store a name what should i add in the write and read function of eeprom?

=>the code is here

THANKS IN ADVANCE…PLEASE REPLY…

 

#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=P3^2;

unsigned char reead,write,write2,i,j;

unsigned int temp;

void delay(unsigned int k)

{

int i,j;

for(i=0;i<k;i++)

for(j=0;j<1275;j++);

}

void lcd_command(unsigned char a)

{

lcd_data_pin=a;

rs=0;

rw=0;

en=1;

delay(1);

en=0;

}

void lcd_data(unsigned char a)

{

lcd_data_pin=a;

rs=1;

rw=0;

en=1;

delay(1);

en=0;

}

lcd_dataa(unsigned char *str)

{

int x;

for(x=0;str[x]!=’’;x++)

{

lcd_data(str[x]);

}

}

void lcd_ini()

{

lcd_command(0x38);                                        // for using 8-bit 2 row LCD 

delay(10);

lcd_command(0x0F);                                          // for display on, cursor blinking

delay(10);

lcd_command(0x80);

delay(10);

}

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;

}

void save() //save in EEPROM

{

start();

send_byte(0xA0); //device address

aknowledge();

send_byte(0x00); //word address

aknowledge();

send_byte(5); //send data

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==5)

{

led=0;

delay(100);

led=1;

delay(100);

write=i+48;

lcd_command(0xC6);

lcd_data(write);

}

else

led=1;

if(j==65)

{

lcd_command(0xC7);

lcd_data(j);

}

aknowledge();

}

 

void main()

{

lcd_ini();

lcd_dataa(“Sent :”);

lcd_command(0xC0);

lcd_dataa(“Read :”);

temp=0;

while(1)

{

save();

Read();

}

}

 

 

[Ashutosh Bhatt]

first check your HW. is everything OK?

then check the code in keil, compile it error free.

then use proteus SW to make similar hardware and test software 

[rohit]

i have compiled and it’s error free…and the proteus hardware is also right.but the thing is,

it is not displaying anything

[Ashutosh Bhatt]

if the code is working in proteus correctly then it must work in your actual HW also. 

[Author]

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