BASIC INPUT OUTPUT PROGRAM EXAMPLE ON LPC2148

Basic Building block of any controller is GPIO, I am demonstrating a simple example to take binary input and set binary output accordingly

#include <LPC214x.H>                       

#define LED       (1 << 17)

#define SWITCH       (1 << 16)

int main (void)

{

IO1DIR |= LED;                                              //set pin P1.17 direction as output

IO1DIR &=~ SWITCH;                                   //set pin P1.16 direction as input

while (1)                //run continuously

{

(IO1PIN & SWITCH) ?(IO1SET = LED):(IO1CLR = LED);

//Set the output status according to input using ? operator

}

}