RE: PIT interrupts

What do you mean by "I am able to generate the interrupts."?  DO you
mean the PIT interrupt status flag is getting set, or are you taking
some other exception? 

Did you follow the last mail I sent and did it solve anything?  Is the
PIT now decrementing?

Have you set MSR[EE] to allow interrupts? Have you set PIT interrupt
priority high enough to get past present interrupt mask level?

Regards,
Allan

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of sripathy23
Sent: Wednesday, September 07, 2005 1:44 PM
To: [email protected]
Subject: [MPC500] PIT interrupts


Dear Members

Thanks for helping me about PIT interrupts. I am able to generate the 
interrupts. But I think I am unable to got to the address at 0x0500 
which is the address for external interrupts.

I am using the pragma for the interrupts. i tried to use the example 
for the sci interrupt in pdf AN2109. Instead of SCI i am using a PIT 
interrupt.
I have given the code below to generate the interrupt and the handler.
In the code below PIT_Int() is the interrupt handler.I have used a 
pragma interrupt on to go to external interrupts. Th ecode in the 
pragma section which is commented is the code which is given in sci 
interrupt example at AN2109. i tried to run this code but it gave me 
an error saying illegal pragma. i think that they have used the 
example in the diab compiler whereas i am using a code warrior 
compiler. is my code for the interrupt is write. I would really 
appreciate if anyone can have a look at this.


void PIT_Int()
{
   cout<<"Interrupt handler"<<endl;
if(USIU.PISCR.B.PS == 1)
 {
     pitctra1++;					// Increment 
PIT interrupt counter
     if(pitctra1==100)	
     {
     countera1 = countera1+100;
     MIOS1.MPWMSM2PULR.R = 100;		/* Set Duty Cycle to 25%*/
     MIOS1.MPWMSM2SCR.B.EN = 1;		/* Enable output on PWM2 */
	 USIU.PISCR.B.PS = 1;	    // Negate interrupt request
     flag1=1;	
	 pitctra1 = 0;
     }
     else
     {
     	
     }
 }
else
 {
    	
 }
}
#pragma interrupt on 
#pragma section code_type "IrqSect" ".abs.00000500" 

//#pragma interrupt Ext_Isr
//#pragma section IrqSect RX address=0x500
//#pragma use_section "IrqSect" Ext_Isr
//__declspec(section"IrqSect")  

void Ext_Isr()
{
#define LEVEL0 0x40000000
asm (" mtspr EID, r0 "); // Set MSR.RI - now recoverable
if (USIU.SIPEND.R&LEVEL0) // Check if IRQ is level 0
{
PIT_Int(); // Call PIT C interrupt handler
}
else
{
// Just return
}
asm (" mtspr NRI, r0 "); // Clear MSR.RI - now irrecoverable

};
#pragma interrupt off






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