I2C PROTOCAL

                                 I2C PROTOCAL

  Code for I2C to EEPROM 

TASK TO WRITE VALUES IN EEPROM AND READ FROM EEPROM ?

//I2C
#include <LPC21xx.h>
#include "delayheader.h"
#include "lcdheader.h"
#include "i2c_header.h"

int main()
{
 char c;

 PINSEL0 |=(1<<4)|(1<<6);   //pin configure
 PINSEL0 &=~(1<<5)|(1<<7);

 lcdinit();      //lcd initialization
 lcdstring("I2C PROGRAM");
 lcdcmd(0xc0);

 I2CONSET= (1<<6);    //this register 6th bit is ENABLE the I2C Block
 I2SCLH=75;        //refer notes given clcok
 I2SCLL=75;    

 I2C_START();  //FOR I2C start funtion

 I2C_DATA(0xA0);    // device addres (memory addres)
 I2C_DATA(0x00);
 I2C_DATA(0x01);

 I2C_DATA('A');    // data writing
 I2C_DATA('B');
 I2C_DATA('C'); 

 I2C_STOP();     //for I2C stop

 delay(500);   // delay

 // "read data from EEPROM we need to write dummy"
 I2C_START();

 I2C_DATA(0xA0);   //write mode
 I2C_DATA(0x00);
 I2C_DATA(0x01);             

 I2C_START();  // repetative start we need to give

 I2C_DATA(0xA1);  // A1 is the read mode

 I2CONSET =(1 << 2);    // to generate ack on reception

 c=I2C_RCV(); //for a
 lcddata(c);
 c=I2C_RCV(); //for b
 lcddata(c);
 c=I2C_RCV();  // for b
 lcddata(c);

 I2C_STOP();

}
 

i2c_header file.h

   void I2C_STOP(void);
   unsigned char I2C_RCV(void);
   void I2C_DATA(unsigned char);
   void I2C_START(void);
   

lcdheader file.h

#define RS (1<<10)
#define RW (1<<12)
#define EN (1<<13)
#define DATA_PINS (0xff<<15)

void delay(int count);
void lcdcmd (int cmd);
void lcddata (int data);
void lcdstring(char *string);
void lcdstringmul(char *str);
void lcd_num(int num);
void lcdinit(void);