LED Blink for LPC 2148

LED Blink for LPC 2148

This experiment is testing output port function of LPC2148 to drive 2 LED at P0.21 and P0.22

//——————————————————————————————————————————————————————————————————//
// Program : Example for display LED
// Description : LED Blink toggle at P0.21 and P0.22
// Frequency : Crystal 12 MHz at PLL 5x(CCLK = 60 MHz),PCLK = 30 MHz
// Filename : led.c
// C compiler : Keil CARM Compiler
//——————————————————————————————————————————————————————————————————//

#include “lpc214x.h” // Header file for Phillips LPC2148 controller
#define LED2_ON FIO0CLR = 0x00200000   // Red led 0.21 on
#define LED2_OFF FIO0SET = 0x00200000  // Red led 0.21 off

//—————————————— Function for Initial system clock ————————————————//
void init()
{
PLL0CFG=0x24; // MSEL = 4,PSEL = 2
PLL0FEED=0xAA; // Feed process
PLL0FEED=0x55;
PLL0CON=0x1;
PLL0FEED=0xAA; // Feed process
PLL0FEED=0x55;
while(!(PLL0STAT & 0x400)); // Wait until PLL Locked
PLL0CON=0x3; // Connect the PLL as the clock source
PLL0FEED=0xAA; // Feed process
PLL0FEED=0x55;
MAMCR=0x2; // Enabling MAM and setting number of clocks used
// for Flash memory fetch (4 cclks in this case)
MAMTIM=0x4;
VPBDIV=0x02; // PCLK at 30 MHz
}

//————————————————— Function delay ———————————————————————//
void delay_ms(long ms) // delay 1 ms per count @ CCLK 60 MHz
{
long i,j;
for (i = 0; i < ms; i++ )
for (j = 0; j < 6659; j++ );
}

//————————————————— Main Program ————————————————————————//

void main()
{
init();
SCS = 0x03;
FIO0DIR |= 0x00600000;
while(1) {
LED1_ON;
LED2_OFF;
delay_ms(50);
LED2_ON;
LED1_OFF;
delay_ms(50);
}
}

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