LED interfacing with LPC2148:

LED interfacing with lpc2148 is common anode. so we have to send logic '0' or 0v though GPIO pin. There are eight led connected to port 0 pins namely P0.0 to P0.7.

Circuit diagram:

LED INTERFACING

 

 1) All led (P0.0 to P0.7) ON and OFF continuously.

/**************************************************************************************************
Expt. 1a.: LED interfacing with to LPC2148
Platform:  LPC2148 Development Board.
  

Hardware Setup:-
 LED Pins- P0.0 to P0.7         
********************************************************************************/

#include<lpc214x.h>  // Include header file 
void delay();        // delay function declaration
int main()
{
 IODIR0=0xFF<<00;     // Assign P0.0 to P0.7 as a output pin
 while(1)             // Infinite loop
 {
 IOCLR0= 0xFF<<00; // Set logic 0 to P0.0 to P0.7, LED OFF
 delay();          // call delay function
 IOSET0=0xFF<<00;  // Set logic 1 to P0.0 to P0.7, LED ON

 delay();
 }

 return 0;
}

void delay()       // delay definition
{
 unsigned int i,j;
 for(i=0;i<500;i++)
 {
  for(j=0;j<32000;j++)
   {

   }
 }
}

2) Led (P0.0 to P0.3) ON and Led (P0.4 to P0.7) OFF and vice versa continuously.

/**************************************************************************************************
Expt. 1b.: LED interfacing with to LPC2148
Platform:  LPC2148 Development Board.
  

Hardware Setup:-
 LED Pins- P0.0 to P0.7         
********************************************************************************/

#include<lpc214x.h>  // Include header file 
void delay();        // delay function declaration
int main()
{
 IODIR0=0xFF<<00;     // Assign P0.0 to P0.7 as a output pin
 while(1)             // Infinite loop
 {
 IOCLR0= 0x0F<<00; // Set logic 0 to P0.0 to P0.3, LED OFF
 IOSET0= 0xF0<<00; // set logic 1 to P0.4 to P0.7, LED ON

 delay();          // call delay function
 IOSET0=0x0F<<00;  // Set logic 1 to P0.0 to P0.3, LED ON

 IOCLR0=0xF0<<00;  // set logic 0 to P0.4 to P0.7, LED OFF

 delay();
 }

 return 0;
}

void delay()       // delay definition
{
 unsigned int i,j;
 for(i=0;i<500;i++)
 {
  for(j=0;j<32000;j++)
   {

   }
 }

2) Time delay generation using Timer 0 in LPC 2148.

**************************************************************************************************
Expt. 1c.: LED interfacing with to LPC2148 (Time delay 1 sec using timer)
Platform:  LPC2148 Development Board.
  

Hardware Setup:-
 LED Pins- P0.0 to P0.7         
********************************************************************************/
 
#include<lpc214x.h>  // Include header file 
void delay();        // delay function declaration
int main()
{ 
  
 VPBDIV=0X02;
 IODIR0=0xFF<<00;     // Assign P0.0 to P0.7 as a output pin
 while(1)             // Infinite loop
 {
 IOCLR0= 0xFF<<00; // Set logic 0 to P0.0 to P0.7, LED OFF
 delay();          // call delay function
 IOSET0=0xFF<<00;  // Set logic 1 to P0.0 to P0.7, LED ON
 delay();
 }
 return 0;
}

void delay()
{
 T0PR=14999;
 T0MR0=1000;
 T0TC=0x00000000;
 T0TCR=0X01;             //START TIMER//
 while(T0TC !=T0MR0);    //1 SEC //
 T0TCR=0X02;             //STOP TIMER //
}