I2C--ARM

#include <LPC21xx.H>
#include"lcdsub.c"

unsigned char i2cread(unsigned char x);
void getdate();
void i2cint();
void i2cstart();
void i2cstop();
void i2cwrite(char);
unsigned char c2(int);
unsigned char c1(int);//
unsigned char i2cread(unsigned char x)
{
unsigned char data;
i2cstart();
 delay(10);
i2cwrite(0xd0);

 delay(10);
i2cwrite(x);
 delay(10);
i2cstart();
 delay(10);


i2cwrite(0xd1);
   delay(10);


   delay(10);

   I2CONSET |=0X04;

   while(!(I2STAT & 0x58));
   delay(10);
 data=I2DAT;
 //lcddata(data);
  //i2cstop();
//datq=data;
lcddata(data+0x30);
  return data;



}
void i2cint()
{

PINSEL0 |=0X50;  //SELECTING sda & scL MODES
I2CONSET=0X40;
I2CONCLR=0X08;      //INITIALIZING I2C MASTXMODE
 //I2CONCLR = 0xff;
I2SCLH=0X4B;
I2SCLL=0X4B;

I2CONCLR=0X08;  
}
void i2cstart()
{

I2CONSET |=0X20;
I2CONSET |=0X08;//  STA=1
while(!(I2STAT & 0X08));   //CHECKING START COPMLETED OR NOT
I2CONCLR=0X28;
//lcdstr("     in  sta4rt      "); //RESETTING
}
void i2cstop()
{

I2CONSET=0X14;//  & ST0=1
 I2CONCLR=0X08;
while(!(I2STAT & 0XA0));   //CHECKING Stop COPMLETED OR NOT
 //lcdstr("in stop");
//I2CONCLR=0X18; //RESETTING

}
void i2cwrite(char data1)
{
//i2cstart();

  I2DAT=data1;
  while(!(I2STAT & 0x18)) ;
   I2CONCLR=0X18;
  // i2cstop();
  // lcdstr("write");
}
/*unsigned char i2cread()
{
char rx;
//I2DAT=0xff;
while(!(I2STAT & 0x50));
rx=I2DAT;

//lcddata(rx);
return rx;
}  */
void gettime()
{
i2cstart();
lcdcmd(0xc0);
 lcddata(c1(i2cread(0x00)));


lcddata(c2(i2cread(0x00)));
lcdstr(":");
lcddata(c1(i2cread(0x01)));

lcddata(c1(i2cread(0x01)));
lcdstr(":");
lcddata(c1(i2cread(0x02)));

lcddata(c2(i2cread(0x02)));
}
unsigned char c1(int val)
{
 return ( ((val&0xF0)>>4)+0x30);
}

unsigned char c2(int val2)
{

return ((val2&0x0F)+0x30);

}
 


int main()
{
 //unsigned char data,datq;  
//IO0DIR |= (1<<3) | (1<<4);
IO0DIR |= 0xFF<<16;
IO0DIR |= (rs);
IO0DIR |= (rw);
IO0DIR |= (en);
lcdint();
i2cint();
lcdstr("initializing");
delay(10);
lcdcmd(0x01);
while(1)
{
i2cstart();

   gettime();

 //i2cstop();


 /* i2cstart();
  i2cwrite(0x41);
  datrx=i2cread();
  lcddata(datrx);
  i2cstop();
  delay(105);  */



}
}

//#include <LPC214X.H>

//#define data 0xFF<<16    //assinging values for po.16-p0.23

#define rs (1<<13)

#define rw (1<<14) 

#define en (1<<15)

void delay(int);

void lcdint();

void lcdcmd(int);

void lcddata(char);

void lcdstr(unsigned char*);

void lcdstr(unsigned char *chr)

{

while(*chr)

{

lcddata(*chr++);

}

}

void lcddata(char xdata)

{

IO0PIN = (xdata<<16);

//IO0SET|=(xdata<<16);

IO0SET =(1<<13);

IO0CLR =(1<<14);

IO0SET = (1<<15);

delay(5);

IO0CLR = (1<<15);

}

void lcdcmd(int cmd)

{

IO0CLR =(1<<13);

IO0CLR =(1<<14);

//IO0SET|=(cmd<<16);

IO0PIN = (cmd<<16);

IO0SET = (1<<15);

delay(5);

IO0CLR = (1<<15);

}

void lcdint()

{

PINSEL0=0x00000000;

PINSEL1=0x00000000;

lcdcmd(0x0E);

  delay(5);

lcdcmd(0x38);

delay(5);

lcdcmd(0x06);

delay(5);

lcdcmd(0x80);

 delay(5);

 //lcdstr("okay");

}

void delay(int t)

{

unsigned int i,j;

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

{

for(j=0;j<21275;j++);

}

}

/*IO0DIR |= 0xFF;

IO0DIR |= (rs);

IO0DIR |= (rw);

IO0DIR |= (en);

*/