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initialiazation of arm

Girish brahme

Dear All,

I am working my project of led Blinking.The controller used is arm7 LPC2214.Crystal is 11.0592mhz.
Which works fine but only one problem is, to make it working i have to touch one of my Oscilloscope probe to crystal of controller.Then it start working.Also works well in keil debugger(internal) and on proteus.So please help me to solve this problem.
The source code is as follows,


#include <lpc22xx.h>
#include <stdio.h>

#define VREF  3
#define Beep      0x00001000
#define LED1      0x00000800
#define LED2      0x00000400
#define LED3      0x00000200
#define LED4      0x00000100
#define CE                0x00000001
#define OE                0x00000002
#define WE                0x08000000




#define low   IO0CLR = LED1 ;   \ 
              IO0CLR = LED2 ;   \ 
              IO0CLR = Beep ;


#define hig   IO0SET  = LED1 ;   \ 
              IO0SET  = LED2 ;   \ 
              IO0SET  = Beep ;

unsigned int val;


unsigned long Fosc = 11059200;
unsigned long Fcclk = 0;
unsigned long Fcco = 0;
unsigned long Fpclk = 0 ;


        void TargetResetInit(void)
        {
        Fcclk = Fosc * 4;
                Fcco = Fcclk * 4;
                Fpclk = (Fcclk / 4) * 1  ;

                MEMMAP = 0x2;                   //remap
            PLLCON = 3;
                if ((Fpclk / (Fcclk / 4)) == 1)
                VPBDIV = 0x10;
                else if ((Fpclk / (Fcclk / 4))== 2)
                                VPBDIV = 0x11;
                         else if ((Fpclk / (Fcclk / 4)) ==  4)
                                        VPBDIV = 1;
                if ((Fcco / Fcclk) == 2)
                PLLCFG = ((Fcclk / Fosc) - 1) | (0 << 5);
                else if ((Fcco / Fcclk) == 4)
                PLLCFG = ((Fcclk / Fosc) - 1) | (1 << 5);
                else if ((Fcco / Fcclk) == 8)
                PLLCFG = ((Fcclk / Fosc) - 1) | (2 << 5);
                else if ((Fcco / Fcclk) == 16)
                PLLCFG = ((Fcclk / Fosc) - 1) | (3 << 5);
                PLLFEED = 0xaa;
        PLLFEED = 0x55;
        while((PLLSTAT & (1 << 10)) == 0);
        PLLCON = 3;
        PLLFEED = 0xaa;
        PLLFEED = 0x55;

            MAMCR = 0;
                if( Fcclk < 20000000)
                MAMTIM = 1;
                else
                if ( Fcclk < 40000000)
                MAMTIM = 2;
                else
                MAMTIM = 3;
            MAMCR = 2;
                VICIntEnClr = 0xffffffff;
        VICVectAddr = 0;
        VICIntSelect = 0;
}



void Delay (unsigned long a) {
  while (--a!=0);
}

 void ledInit(void)
 {

   IO2DIR = 0xFFFFFFFF;
   IO2SET = 0;

   IO1PIN = 0x00000000;
   IO1DIR |= CE;
   IO1DIR |= OE;
   IODIR1 |= CE;
   IODIR1 |= OE;

   IO1SET |= CE;
   IO1SET |= OE;

   IO3DIR = 0xFFFFFFFF;
   IO3SET = WE;

   IO0DIR = LED1;
   IO0SET |= LED1;
}

static void ledOn(int led){
   IO0CLR = led;
}

static void ledOff(int led){
   IO0SET = led;
}

void delay(int d){
  for(; d; --d);
}




   int main(void)
   {
          ledInit();
          TargetResetInit();
      ledOn(LED2);
          ledInit();

           while(1)
       {
        ledOn(LED1);
        delay(20000*8);
        delay(20000*8);
        delay(20000*8);
        delay(20000*8);
        delay(20000*8);

        ledOff(LED1);
                delay(20000*8);
        delay(20000*8);
        delay(20000*8);
        delay(20000*8);
        delay(20000*8);
      }

}

Thanks & regards,
Girish

Parents
  • 0 in reply to ²erik malund

    Another thing - does your processor always make use of an external oscillator, or does it boot with an internal RC oscillator like 23xx does? In that case - what code do you have that turns on the external oscillator and waits for it to stabilize before it may be connected for use by the core?

    You post code for the PLL (seems to be different PLL settings for the two codes) but the PLL needs input. Is the oscillator spun up correcly before connected?

Reply
  • 0 in reply to ²erik malund

    Another thing - does your processor always make use of an external oscillator, or does it boot with an internal RC oscillator like 23xx does? In that case - what code do you have that turns on the external oscillator and waits for it to stabilize before it may be connected for use by the core?

    You post code for the PLL (seems to be different PLL settings for the two codes) but the PLL needs input. Is the oscillator spun up correcly before connected?

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