>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 08 January 2005 14:05
>To: Microcontroller discussion list - Public.
>Subject: Re: [PIC]: Assembly Language Integration with HI-TECH C
>
>
>Bob Ammerman wrote:
>
>> Of course this doesn't support re-entrancy or recursion, and can get 
>> messy
>> if the same function is called from an interrupt and mainline code.
>
>In the case of the Hi-Tech PICC/PICC-18, calling functions 
>from an ISR and from main code can get messy, but doesn't have 
>to. By default it is not allowed; the compiler creates a call 
>tree for main and one for each interrupt vector, and there are 
>no common functions allowed in different call trees.

Actually, it IS allowed under very specific circumstances.  If the
function uses no local variables, and has either no arguments or one
argument of type char (i.e. fits in W reg), then PICC will happily let
you call the function from the main loop and in the ISR.

Regards

Mike

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