IO Operations Revision as of 11:55, 17 March 2015 by Amruta (Talk | contribs) (diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

Amruta (talk) 11:24, 17 March 2015 (IST)

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Code

#include "lpc17xx.h"   // NXP Library containing all port abd register definations
#include "stdutils.h"  // Explore Embedded library
 
#define LED		29	 //P1.29
#define SWITCH         28	 //P1.28
int main()
{
        SystemInit();
 
	LPC_PINCON->PINSEL3 = 0x00;			   // Configure Pin as GPIO
	util_BitSet(LPC_GPIO1->FIODIR,LED);	   	   // Set pin direction as output
	util_BitClear (LPC_GPIO1->FIODIR,SWITCH);	   // Set pin direction as input
 
	while(1)
	{		
		if (util_IsBitCleared (LPC_GPIO1->FIOPIN,SWITCH))	// check if switch is pressed
			util_BitSet (LPC_GPIO1->FIOSET,LED);	   // turn on LED	
		else
			util_BitSet (LPC_GPIO1->FIOCLR,LED);	// turn off LED	
	}
}