ARM ARM LPC 2148 INTEFACING for LED

Port1 pins P1.24 to P1.31 and the  these pins are configured as General Purpose output pins. 
#include<lpc2148.H>                         //LPC2148 Header
 void delay()
{
for(int i=0x00;i<=0xff;i++)
for(int j=0x00;j<=0xFf;j++)  ;          // Delay program 
} 
void main()
{
PINSEL2 = 0X00000000;               //  Set   P1.24 TO P1.31 as GPIO
IO1DIR = 0XFF000000;                 //Port pins  P1.24 to P 1.31 Configured as Output port.

while(1)                                          //Infinite loop
{
IO1SET=0XFF000000;                      // Pins P1.24 to P1.31 goes to high state
delay();
IO1CLR=0XFF000000;                      // Pins P1.24 to   P1.31 goes to low state
delay()   ;
}
}
PROGRAM – 2
This program glows LEDs alternately by sending 55H and AAH through the port1 Pins. 
# include  <LPC214X.H>               //LPC2148 HEADER
void delay(void)                              // Delay Program
{ 
unsigned  int i;
i=0xffffff;
 while(i--); 
}
int main(void) 
{
PINSEL2=0x0000;                                 // Port 1 is I/O
IODIR1 = 0XFF <<24   ;             // Port Pins P1.24 to P1.31 as Output Pins
while(1)                                    // Infinite loop
 {

IOSET1=0X55<<25              ;        //   P1.25,P1.27,P1.29  & P1.31 LEDs will  Glow
delay()                                   ;       // Call delay function 
 IOCLR1=  0X55 <<25          ;       // P1.25,P1.27,P1.29 &P1.31 LEDs will be  off           
IOSET1=0XAA<<24             ;     //P1.24,P1.26,P1.28 &P1.30 LEDs are Glow                  
delay ()                                   ;  // Call delay function 
IOCLR1=0XAA<<24           ;   // P1.24,P1.26,P1.28 &P1.30 LEDs are off
} 
}

OPTO ISOLATOR CIRCUIT

# include  <LPC214X.H>            //LPC2148 HEADER    
# define relay 1<<30                  // ASSIGN P0.30 Pin to  RELAY  input  PIN
void DELAY(void)                     // Delay function 
 {
 unsigned int i;

i=0xffffff; 

while(i--)  ; 
}

int main(void)                                // Main program 
 {

IODIR0=1<<30           ;           //  P0.30 Port Pin  as Outport
while(1)                                 //INFINITE LOOP
{
 IOSET0=1<<30           ;        //SWITCH OFF RELAY
DELAY()                       ;       //CALL DELAY


IOCLR0=1<<30               ;    // SWITCH ON RELAY
DELAY()                           ;   // CALL DELAY
}                                           //   REPEAT LOOP
 }

Stepper motor

# include  <LPC214X.H>                   // LPC2148 HEADER    
 void delay_ms()                          ; // Delay function 
 void main()                                 ; // Main program starts

{

PINSEL2 = 0X00000000;               //  Set   P1.19 TO P1.22 as GPIO

IO1DIR=0x000000F0   ;                // Set Port 1 as out port

while(1)                                         // Infinite Loop 

{

IO1PIN = 0X00000090;                   // Send the code1 for phase 1

delay_ms() ;                                   // Call Delay 

IO0PIN = 0X00000050 ;                // Send the code 2 for phase 2

delay_ms()                   ;            // Call Delay

IO1PIN = 0X00000060  ;           // Send the code 3 for phase 3

delay_ms()                   ;           // Call Delay


IO1PIN = 0X000000A0 ;          // Send the code 3 for phase 3

delay_ms()              ;                 // Call Delay
}
}
void delay_ms()                    // Delay function  program
{
int i,j             ;

for(i=0;i<0x0a;i++)

for (j=0;j<750;j++)  ;

}