Lpc2000

Does anyone see anything wrong with the following I2C routine:?

void SendI2CAddress(unsigned char Addr_S){
    I2CONCLR = 0x6C;				// Clear control bits
    I2CONSET = 0x40;				// Active Master Mode 
on I2C bus
    if((Addr_S & 0x01))				// Test if reading
       I2CONSET = STA | AA;			// Set STA - allow 
master to acknowlege slave
    else
       I2CONSET = STA;				// Set STA don't 
allow acknowledges
    while(I2STAT!=0x08) ;			// Wait for start to 
be completed
    I2DAT    = Addr_S;				// Load slave Address
    I2CONCLR = SIC | STAC;			// Clear i2c 
interrupt bit to send the data
    while( ! (I2CONSET & SI)) ;		// Wait until status available
}

unsigned char ReadI2C(void) {
    I2CONCLR = SIC;					// Clear SIC;
    while( ! (I2CONSET & 0x8));		// Wait until status available
    // Read the data... 
    return I2DAT;
}

void WriteI2C(unsigned char Data) {
    I2DAT    = Data;				// Load Data
    I2CONCLR = 0x08;				// SIC; Clear i2c 
interrupt bit to send the data
    while( ! (I2CONSET & 0x8));		// Wait until status available
}

void StopI2C(void){
    I2CONCLR = SIC;
    I2CONSET = STO;
    while((I2CONSET & STO)) ;		// Wait for Stopped I2C bus
}

The code hangs on "while((I2CONSET & STO)) ;// Wait for Stopped I2C 
bus", while the chip holds both I2C lines low and doesn't release 
them. I'm using the LPC2129.

Thanks!