Query on PIT in MCF5282

TTA — Mon, 05 Jun 2006 21:18:34 GMT

Hi ,

I am using M5282EVB evaluation board with Codewarrior for coldfire.

I am trying to set up a PIT in my application.

But somehow the interrupt doesnt get generated. Is there anything i am missing here.In the Vectors.s I have replaced the existing interrupt handler for Vector 77 (119) with _pit0_handler. Am i missing something here?

void main()

{

InitializeTimers();

}

void InitializeTimers()
{

MCF5282_INTC0_ICR55 = 0 | MCF5282_INTC_ICR_IP(6) | MCF5282_INTC_ICR_IL(6);

MCF5282_PIT0_PCSR = 0 | MCF5282_PIT_PCSR_PRE(0xF)
|MCF5282_PIT_PCSR_PIE
|MCF5282_PIT_PCSR_EN
|MCF5282_PIT_PCSR_RLD;

MCF5282_PIT0_PMR = 0x1111;

MCF5282_INTC0_ICR55 = 0x3F;//0x0B;//Set IP and IL
MCF5282_INTC0_IMRH &= 0x00800000;//Enable PIT0

}

__interrupt__ void pit0_handler(void)
{ int i;

  for(i=0;i<=300000;i++);
  MCF5282_GPIO_PORTTC &= 0x00;
  MCF5282_GPIO_PORTTD |= 0xFF;

MCF5282_PIT0_PCSR |= MCF5282_PIT_PCSR_PIF;
//MCF5282_PIT0_PCSR &= 0xFFFE; Is this required?????

}

Re: Query on PIT in MCF5282

DavidS — Sat, 17 Jun 2006 01:03:23 GMT

Hi TTA,

Did you lower the SR from 0x2700 to 0x2000? The system status register (SR) is like a global mask. Whatever Interrupt Level it is at, then interrupt sources that are at that level or less will be blocked. So lowering the SR to a IL=0 (i.e. SR=0x2000) will let the interrupt source get to the core.

Regards, DavidS

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