Re: which rom400_task routines are safe to call from an isr

I think you may be able to do better than this...if you set the 'need_sched'
bit in your interrupt (that's "rom_flags.0", see definition for rom_flags in
startup400.a51) then the next time the millisecond ticker comes around, it
will run User_IOPoll  and then the scheduler.  Unless a lower priority
interrupt was in progress when the timer tick fired, you should be able to
get your IOPoll run and your task scheduled within about a millisecond of
the event.  If you need better performance than this, the timer 0 interrupt
could always be replaced with a custom one greased for your app.

Kris

----- Original Message -----
From: "john bogus" <bogusemail98230-/[email protected]>
To: <tini-6tN4nzCoH/[email protected]>; "Kris Ardis" <[email protected]>
Sent: Tuesday, March 09, 2004 11:04 AM
Subject: Re: [TINI]which rom400_task routines are safe to call from an isr


I was hoping to get better performance than this

I want to use this in a case where I get an interrupt
every 2-3 milliseconds which then requires about 1-2
milliseconds of processing.  While the processing is
happening I do not want to miss other interrupts.

polling every 4ms means my performance will drop to
roughly half.

any suggestions?

--- Kris Ardis <Kristopher.Ardis-6tN4nzCoH/[email protected]> wrote:
> Waking up tasks from an interrupt doesn't work too
> well.  Instead, you can
> register a polling routine using the User IO Poll
> routine library.  It is
> safe for the polling routines to call the task
> functions, so you can have
> your polling routine monitor for a wakeup signal.
>
> Kris
>
> ----- Original Message -----
> From: "john bogus" <bogusemail98230-/[email protected]>
> To: <tini-6tN4nzCoH/[email protected]>
> Sent: Thursday, March 04, 2004 2:13 PM
> Subject: [TINI]which rom400_task routines are safe
> to call from an isr
>
>
>
>
> I have some C code and  want to wake (or spawn) a
> task
> from an ISR.  Because of the way interrupts work on
> 8051 processors I assume there are limits on what i
> can do with the rom400_task task scheduler rotuines
> from an ISR.
>
> - which rom400_task routines are safe to call from
> an
> isr?
>
> - are there any recommendations on how this should
> be
> done on the 80c400?
>
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