Hi WH Tan

I have read the manual and have just read it again.
My code is nearly direct copy of the code in section 2.9.2.3

My code taken from the Microchip example on disk says 
#pragma code InterruptVectorLow = 0x18 
Where the manual says 
#pragma code low_vector = 0x18
I can't see how that makes any difference 

The next section covers context saving.
I'm not using any math routines or functions that return any thing ....other
than void in my ISR.
If I add the save=.tmpdata directive the complier says it is doing that for
me already.  (I only tried to add this to the high ISR and stopped trying
when the compiler told me it was redundant.  Micorchip support says on older
compiler versions this was not done)
Maybe there is something else I should save but I'm not sure what it would
be.


The next section is nesting of interrupts.
This is where I might be mising a statement to set the GEIL bit that they
talk about.
The way I read that was if I wanted to nest interrupts I could by adding
that statement.
But I did not want to nest my low priority interupts (at least I don't think
I do) they all have low latency so if they can "hang around till the current
section finishes with no harm done then I'll get to them all in good
time........hopefully


The next section is the variable locate section.
It says this helps the compiler locate/ generate the most efficent bank
switching code.
I've been through the whole thing and nothing lept out at me.
So I'm at a loss to figure out just what exactly you are refering to.
If you have any further clues I'd be grateful


 


 
 
Phillip
Things should be as simple as possible but no simpler
 
 
 
Phillip Coiner
CTO, GPS Source, Inc.
 
 
Your source for quality GNSS Networking Solutions and Design Services, Now!

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
WH Tan
Sent: Thursday, June 29, 2006 12:55 PM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] C18 resource remaining metric/test

2006/6/30, Phillip wrote:

> That code is copied straight from the example from Microchip that is
> included with the compiler.

That sounds like you were copying the code without understanding what
it actually does.  See the #pragma interruptlow in the manual.  The
reason I point you to the manual is that it explains some other things
that are relevant and important.


Best regards,

-- 
WH Tan
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