Code debugging problem _EEPROM using I2C and display into LCD

[Shiv Kumar Mishra]

// I want to write single byte into EEPROM and display the same in LCD. This code having some debugging problem and i am not sure wheather logic is correct written.Can anybody correct it and send at [email protected]. Please comment if needed so that it is easy to understand as i am beginner for 8051. could anybody give me code for same objective.

 

Thanks in Advance !!!

 

#include<reg51.h>

 

#define lcddata P0;

 

sbit SDA=P0^1;      // serial data line

sbit SCL=P0^2;      // serial port line

 

 

 

sbit rs=P2^0;    

sbit rw=P2^1;

sbit en=P2^2;

 

void I2Cstart();

void I2Cstop(); 

void I2Cack();

void I2Cnack();

void I2Cwrite(unsigned char d);

void I2Cread(unsigned char );

void I2Creset(void);

 

void ldata(unsigned char ddata);

void init(void);

void lcmd(unsigned char sdata)

void ldisp(unsigned char location, unsigned char *d);

 

 

unsigned char arr[]='A';

unsigned int i;

 

 

 

 

void msdelay(unsigned char );  // delay 

 

 

void main (void)

{

unsigned char i;

void init(void);

I2Creset();

I2Cstart();

I2Cwrite(0xA0);

I2Cack();

I2Cwrite(0x00);

I2Cack();

//for(i=0; i<2; i++)

{

I2Cwrite(arr);

I2Cack();

ldisp(0x80,'c');

lcmd(0x18);

SCL=0;

SDA=1;

  }

I2Cstart();

I2Cwrite(0xA0);

I2Cack();

I2Cread();

I2Cnack();

ldisp(0xC0,'z');

lcmd(0x18);

 

}

 

void I2Cstart()    // i2c bus start condition

{

SDA=1;

msdelay(10);

SCL=1;

msdelay(10);

SDA=0;

msdelay(10);

SCL=0;

msdelay(10);

}

 

void I2Cstop()     // i2c bus stop condition

{

SDA=0;

msdelay(10);

SCL=1;

msdelay(10);

SDA=1;

msdelay(10);

SCL=0;

msdelay(10);

}

 

void I2Cack()   // i2c bus acknowledgementt

{

SDA=0;

msdelay(10);

SCL=1;

msdelay(10);

SCL=0;

  msdelay(10);

}

 

void I2Cnack()   // i2c bus no acknowledgement

 

{

SDA=1;

msdelay(10);

SCL=1;

msdelay(10);

SCL=1;

msdelay(10);

 

}

 

void I2Cwrite(unsigned char d)   // i2c bus write data

{

unsigned char k, j=0x80;

unsigned char c;

for(k=0;k<8;k++)

{

SDA=(d&j);

j=j>>1;

SCL=1;

SCL=0;;

}

SDA=1;

SCL=1;

c=SDA;

SCL=0;

}

 

void I2Cread(unsigned char flag )   //i2c bus read data

{

unsigned char j,z=0x00,q=0x80;

 

  SDA=1;

  for(j=0;j<8;j++)

  {

unsigned int flag;

  SCL=1;

  flag=SDA;

  if(flag=1)

  {

z=(z|q);

q=q>>1;

SCL=0;

  }

     }

}

 

void I2Creset(void)

{

I2Cstart();

delay(10);

I2Cwrite(0xA0);

delay(10);

I2Cwrite(0x00);

for(i=0;i<=25;i++);

{

I2Cwrite(0x00);

  }

 

}

 

 

 

 

 

void delay(unsigned int time)

{

unsigned int a,b;

for(a=0;a<=time;a++)

{

    for(b=0;b<=800;b++)

{}

}

}

 void lcmd(unsigned char sdata)

{

rs=0;

rw=0;

en=1;

lcddata=sdata;

en=0;

}

 

void ldata(unsigned char ddata)

{

rs=1;

rw=0;

en=1;

lcddata=ddata;

  en=0;

}

 

void init(void)

{

lcmd(0x30);

delay(10);

lcmd(0x38);

delay(10);

lcmd(0x0C);

delay(10);

  lcmd(0x01);

  delay(10);

  lcmd(0x06);

  delay(10);

}

 

void ldisp(unsigned char location, unsigned char *d)

{    

//unsigned char a;

lcmd(0x8F|location);

delay(1);

while(*d)

{

//a=*d;

ldata(*d++);

    delay(10);

}

} 

 

 

[Aslam Husain]

Go through this link……

http://www.engineersgarage.com/microcontroller/8051projects/interface-serial-eeprom-24c02-AT89C51-circuit

[Author]

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