Function writing notes - setting GPIO direction

Now I am writing functions for setting direction of GPIO ports.  So far so good.

// ****************************************************************************
// Program - Blink LED
// Description - Blink LED
// Author - TL Fong
// Version - 0.36
// Date - 2013jul11hkt1205
// License - Free
// Hardware - Somy ARM Cortex M0 LPC1114/301 Learning Board 
// Software - Keil uVision 4.71.2.0 ARM compiler toolchain
// Hardware configuration notes
//   1. LED1 is connected to PIO1-8 
// ****************************************************************************

#include <stdio.h>
#include "LPC11xx.h"
#include "timer.h"

void setPortPinOutput(int portNumber, int pinNumber)
  {
switch( portNumber )
{
    case 1:
      LPC_GPIO1->DIR |= (1 << pinNumber);
break;
    case 2:
LPC_GPIO2->DIR |= (1 << pinNumber);
 break;    
default:
 break;
}
}


void setPort1Pin8ToOutput() // PIO1_8 for LED1 set to output
  {
  LPC_GPIO1->DIR |= (1 << 8);
  }

void setPort1Pin8Low() // PIO1_8 Low = LED1 on
  {
  LPC_GPIO1->DATA &= ~(1 << 8);
  }

void setPort1Pin8High() // PIO1_8 High = LED1 off
  {  
  LPC_GPIO1->DATA |= (1 << 8);
  }


int main()
  {
  // setPort1Pin8ToOutput(); // PIO1_8 for LED1 pin set to output

  setPortPinOutput(1, 8);

  while (1)
 {  
 setPort1Pin8Low(); // LED on
    delayTenthSecond(5);
    setPort1Pin8High(); // LED off
    delaySecond(1);
    }
  }

// ****************************************************************************
// End of Program
// ****************************************************************************