RE: ISR Function

Rajesh, perhaps I don't understand your question - do you have PIT
working and interrupting, but you just don't know how to call a C
function from assembler?
 
Most compilers allow you to specify a function is an interrupt function,
i.e. with Diab compiler you can do the following:
 
INTERRUPT void external_interrupt (void)
{
    "
    "
    PitIsr ();    /* handle PIT interrupt */
}
 
so in your vector area, you have
 .org base_add + 0x500  ;External Interrupt Exception
 b external_interrupt

So now calling your DAC function within PitIsr is just like any other C
code i.e. DAC(x,y);
 
The question of where do x,y come from within an ISR - perhaps these are
global variables?
 
I'm not sure if this is what you were asking.
 
- Allan   

 
 

	-----Original Message-----
	From: [email protected] [mailto:[email protected]] On
Behalf Of Rajesh
	Sent: Thursday, June 29, 2006 4:21 AM
	To: [email protected]
	Subject: [MPC500] ISR Function
	
	

	
	Hi everyone,
	I am working with MPC566 and I have a function DAC(x,y), 
	i.e. a D/A converter function, which I want to execute on
Interrupt 
	at every 100 ms.
	I am using a PIT and can set time between 64 msecs to 4.19 secs.
	Can anyone please tell me how to call this function in an ISR?
	
	-regards
	Rajesh
	
	

	 



[Non-text portions of this message have been removed]



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