Query on PIT in MCF5282

[TTA]

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?????
 

}

[DavidS]

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