Re: [Amforth] Interrupts - T flag, asm float problem

[pito <pi...@vo...>]

Yes, the CLI/SEI helped, however it it not the best solution,
though. I'll try to remove T handling from my asm.
But still coping with rec-float..
P.

----- PŮVODNÍ ZPRÁVA -----
Od: "Matthias Trute" <mt...@we...>
Komu: "pito" <pi...@vo...>
Předmět: Re: [Amforth] Interrupts - T flag, asm float problem
Datum: 27.5.2011 - 8:03:29

> Pito,
> 
> > In my newest float libs (1/2011) I am handling T
> > this way - pushing
> > > an poping it into r14.7. It worked with 4.0 and
> > 4.2. Is it possible
> > > you set the T in 4.0/4.2 within the inner
> > interpreter only (it means
> > > before entering a word) and now you set the T
> > anytime when interrupt
> > > fires- it means maybe during e.g. __SUBF12??
> 
> The redesign of the interrupt handling did not
> change _that_
> part. It was always as it is now. The T-flag could
> be set
> anytime, and the inner intepreter checks it
> whenever it
> is entered. The timing has not changed here.
> 
> What has changed is, that the controller itself is
> kept significantly
> longer in interrupt mode than in previous
> versions, since the reti
> instruction has been delayd. I cannot see anything
> here that could do
> harm to your code however. Even long running
> assembly snippets did work
> as before in my tests (they of course did not
> touch the T flag).
> 
> Currently I'd that it was pure luck, that the
> error did not came up
> earlier.. strange enough..
> 
> Matthias
>