On Fri, 9 Jan 2004 22:08:58 +0100, Jan-Erik Soderholm XA
(TN/PAC) wrote on Re: [PIC:] Pic as an i2c slave. Debug
bits:

>Robert Soubie wrote :
>
>> I have browsed the whole assembler file compild fo my "big"
>> (8k) application, and found no trace of interrupt stuff
>> (enabling or disabling) by the compiler. This is what
>> thought I would find, because that compiler has a special
>> system for interrupts, that are delayed under the current
>> basic instruction has been executed; in other words, basic
>> routines cannot be iterrupted in the immediate sens of the
>> term.
>
>It's very possible that the Basic compiler has something called
>"interrupts" that isn't the same thing as what a ASM programmer
>would call an "interrupt".  That is, it's not unlikely that
>the hardware (PIC) always has interrupts enabled, but the
>Basic RT (Run Time) environment "hides" this from
>the higher level code and also, as you point out, delays
>the execution of the *Basic* ISR until the current Basic
>"statement" has finished.

You are correct; this is what is explained at
http://microengineeringlabs.com/resources/pbpmanual/5_42-5_47.htm#544.

However the documentation says it is possible to implement
"assembler interrupts"; the two kinds being mutually
exclusive.=20

This is explained at
http://microengineeringlabs.com/resources/pbpmanual/9_0.htm#93,
where there is an explanation on what to save and how to do
it; the procedures I use that implement that have been
written by Timothy Box, a very nice and helping member of
both the PicBasic list and our list.=20

A (much) more elaborated version for the 18F series has been
written by Darrel Taylor.=20

=46or the time being, I work under the assumption that the
context saving routines are correct and the compiler is weel
behaved; I still have to run more tests to really understand
what went wrong so far; this is a rainy WE, so back to work!

Thanks again for your help.

* Xrobert.soubie@free.frX (veuillez supprimer les "X")
* http://www.astrosurf.com/soubie
* Au royaume des aveugles, les borgnes sont mal vus... - P.Dac

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