Re: ISR Function

Hi,
    Now I am calling DAC(x,y) in PIT ISR and x,y are global variables.
But now my code is getting stuck into the following function 
void fp_unavailable_exception (void)
{
    ARCH_ILLEGAL_INSTRUCTION_ASM;
}
and this function is called in file "excfuncs.c".

Can you please suggest how to deal with this?


--- In [email protected], "Dobbin Allan-r11834" 
<Allan.Dobbin@...> wrote:
>
> Set your PIT to interrupt every 100ms.  From within the PIT ISR, 
simply
> call DAC ( ).  No need to pass the parameters x and y since they are
> global variables.  If they are not global, make them global.
>  
> If DAC function and main will both modify x or y, you have to 
protect
> them within main whilst modifying i.e. temporary disable PIT 
interrupt
> whilst modifying.
>  
>  
> 
> 	-----Original Message-----
> 	From: [email protected] [mailto:[email protected]] 
On
> Behalf Of Rajesh
> 	Sent: Thursday, June 29, 2006 11:40 PM
> 	To: [email protected]
> 	Subject: [MPC500] Re: ISR Function
> 	
> 	
> 
> 	Hi,
> 	
> 	I think I was unable to put my question. Sorry for that, here 
it
> is:
> 	
> 	My code is like this:
> 	
> 	main()
> 	{
> 	
> 	function1(); // this will execute and output of this function 
is
> x,y 
> 	//which are global variables.
> 	}
> 	Now my DAC(x,y) function will take this x,y as input.I am 
trying
> to 
> 	execute this DAC(x,y) function at every 100 milisec, nomatter
> where I 
> 	am in the main loop at that time.
> 	I am using COdeWarrior Compiler 8.1.
> 	
> 	-regards
> 	Rajesh
> 	
> 	--- In [email protected] <mailto:MPC500%
40yahoogroups.com>
> , "Dobbin Allan-r11834" 
> 	<Allan.Dobbin@> wrote:
> 	>
> 	> 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:MPC500%
40yahoogroups.com>
> [mailto:[email protected] <mailto:MPC500%40yahoogroups.com> ] 
> 	On
> 	> Behalf Of Rajesh
> 	> Sent: Thursday, June 29, 2006 4:21 AM
> 	> To: [email protected] <mailto:MPC500%
40yahoogroups.com> 
> 	> 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]
> 	>
> 	
> 	
> 
> 	 
> 
> 
> 
> [Non-text portions of this message have been removed]
>






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