I2C intrfacing with lpc2148

Code C - [expand]
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#include<lpc214x.h>
void i2c_start()
{
  I2C0CONSET=1<<5;         // start falg bit 1 
}
void i2c_stop()
{
  I2C0CONSET=1<<4;         // stop falg bit 1 
}
void i2c_init()
{
  //for master transmitter mode
    I2C0CONSET=1<<6;         //i2c enble I2EN bit
  I2C0SCLH=80;
    I2C0SCLL=70;
}
int main()
{
    PINSEL0=(1<<4) |  (1<<6) ;     //for SCL and SDA functiong
    IODIR0= (1<<2) | (1<<3);       // for making SDA and SCL output
     I2C0CONCLR=0x6C;
  i2c_init();
     i2c_start();
    while(I2C0STAT != 0x08);
    I2C0DAT = 0xA0;
    while(I2C0STAT != 0x28);
    I2C0DAT = 0x00;
    while(I2C0STAT != 0x28);
    I2C0DAT = 0x00;
    while(I2C0STAT != 0x28);
    I2C0DAT = 12;
    while(I2C0STAT != 0x28);
    i2c_stop();
    I2C0CONCLR=(1<<2) |(1<<3) |(1<<5)|(1<<6);
    while(1);
}