ARM LPC2129 Mini Development Board – LED Interfacing

ARM LPC2129 Mini Development Board has 3 SMD LED s connected to port pins P0.17, P0.18 & P0.19 via jumpers J1 , J2 & J3. If any jumper is left open, then the corresponding port pin can be used independently. The sample code given below toggles the LEDs in fixed intervals. The LEDs turn ON when the port pins are at logic low state and they get turned OFF when the port pins are at logic high state.

Schematic:

Sample code :

/*******************************************************************************************************
*	                         LED INTERFACING PROGRAM                                                  *
********************************************************************************************************									 
*                               HEADER DECLARATIONS                                                    *
*******************************************************************************************************/
#include<lpc21xx.h>

/*******************************************************************************************************
				               FUNCTION DECLARATIONS
*******************************************************************************************************/
void Delay(unsigned long val);

/*******************************************************************************************************
					             MAIN FUNCTION
*******************************************************************************************************/
int main()
{
  IO0DIR = 0XFFFFFFFF;         /* Set Port0 as output                                                 */
  while(1)                     /* Infinite loop                                                       */
   {
     IO0SET = 0X000E0000;      /* Set P0.17,P0.18,P0.19 at logic high state                           */
     Delay(1000000);           /* Delay of 100ms                                                      */
     IO0CLR = 0X000E0000;      /* Set P0.17,P0.18,P0.19 at logic low state                            */
     Delay(1000000);
   }
}

/*******************************************************************************************************
* Function    : Delay                                                                                  *
*                                                                                                      *
* Description : Function for delay                                                                     *
*                                                                                                      *
* Parameter   : val - the value for delay                                                              *
*                                                                                                      *
*******************************************************************************************************/
void Delay(unsigned long val)
{
   while(val>0)
   {
     val--;
   }
}
/***************************************************END************************************************/

/*******************************************************************************************************

* LED INTERFACING PROGRAM *

********************************************************************************************************

* HEADER DECLARATIONS *

*******************************************************************************************************/

#include<lpc21xx.h>

/*******************************************************************************************************

FUNCTION DECLARATIONS

*******************************************************************************************************/

void Delay(unsigned long val);

/*******************************************************************************************************

MAIN FUNCTION

*******************************************************************************************************/

int main()

{

IO0DIR = 0XFFFFFFFF; /* Set Port0 as output */

while(1) /* Infinite loop */

{

IO0SET = 0X000E0000; /* Set P0.17,P0.18,P0.19 at logic high state */

Delay(1000000); /* Delay of 100ms */

IO0CLR = 0X000E0000; /* Set P0.17,P0.18,P0.19 at logic low state */

Delay(1000000);

}

/*******************************************************************************************************

* Function : Delay *

* *

* Description : Function for delay *

* *

* Parameter : val - the value for delay *

* *

*******************************************************************************************************/

void Delay(unsigned long val)

{

while(val>0)

{

val--;

}

/***************************************************END************************************************/

Topics related to ARM LPC2129 Mini Development Board:

Resources

Softwares
- Keil uVision4 IDE
- Flash Utility Tool
Datasheets
- LPC2129
- MCP 2551
- MCP 9700
- LM 7805
- LD 1117
- MAX 232

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