Re: [hatari-devel] Lockup demo

[Laurent Sallafranque <laurent.sallafranque@xxxxxxx>]

Hi,


Hatari always shift the data by 2 bits when transfering data from DMA to 
DSP (eg: Mprg2 player works because of this).

You say 1 bit or two. Can  you be more precise ?

I mean I always shift by 2 bits, but do you mean that in some 
circumstances, the shift could be only 1 bit ?

In which circumstances ?

Regards


Laurent

Le 06/12/2020 à 21:42, Mariusz Buras a écrit :

> If you get noise this might be due to another issue in hatari I've encountered.
> When sending data to DSP over DMA in handshake mode data is shifted by
> a bit or two. I think hatari didn't emulate that bug properly
> properly.
>
> On Sun, 6 Dec 2020 at 20:38, Laurent Sallafranque
> <laurent.sallafranque@xxxxxxx> wrote:
> >   > What about the Lockup demo music?
> >
> > There were 2 different problems with lockup demo :
> >
> > - the tridi needed a hostport interruption that was bugged (never tested
> > as I had never encountered any program that used it)
> >
> > - the music needs a new interrupt that was never coded until now.
> >
> > The SCI port is not connected to the Falcon and the Falcon docs says not
> > to use it.
> >
> > But Mariusz used the SCI timer to synchronise the music with the SSI and
> > it works.
> >
> > So, I have to code a new interrupt into the DSP, and a new timer.
> >
> > I've nearly finished, but instead of music, I have bad noise for now.
> >
> > I work on it.
> >
> > Regards
> >
> > Laurent
> >
> >
> > Le 06/12/2020 à 20:10, Eero Tamminen a écrit :
> > > Hi,
> > >
> > > On 12/6/20 8:09 PM, Laurent Sallafranque wrote:
> > > > No, you're right. I've tested it also with older versions of hatari
> > > > and I always get 4 bombs (with or without MMU, ...)
> > > Ok, it's weird that it on some days works for me.
> > >
> > >
> > > What about the Lockup demo music?
> > >
> > > In the Youtube video linked from pouet.net,
> > > music starts once the progress bar at the start
> > > finishes, but in Hatari Lockup demo is silent.
> > >
> > >
> > >      - Eero
> > >
> > > > Le 06/12/2020 à 17:29, Eero Tamminen a écrit :
> > > > > On 12/5/20 5:00 PM, Laurent Sallafranque wrote:
> > > > > > I've comited a more simple version of the fix.
> > > > > >
> > > > > > No need to add the "dsp_core.interrupt_state == DSP_INTERRUPT_NONE"
> > > > > > when searching for a new interruption.
> > > > > >
> > > > > > The patch is very easy now. I've just moved the 2 interruptions
> > > > > > into the main interruption routine.
> > > > > >
> > > > > > Before, the hostport interruption was tested only after a DSP or
> > > > > > host read or write, but the interruption can happen as soon as the
> > > > > > buffers are empty or full.
> > > > > >
> > > > > > Now, I just do the test after each DSP instruction.
> > > > > >
> > > > > >
> > > > > > I've done many tests with demos that I know use DSP interrupts,
> > > > > > games and music programs.
> > > > > >
> > > > > > I didn't notice any regression with this patch.
> > > > > >
> > > > > > Enjoy Lockup demo now ;)
> > > > > It works now with DSP and shows 3D graphics, but I don't have any
> > > > > music.
> > > > >
> > > > > Do you have music in it?
> > > > >
> > > > >
> > > > > I tested many programs and only regression I
> > > > > noticed was in Sidetracked music demo, it doesn't
> > > > > anymore start, *even with older Hatari version*,
> > > > > neither with TOS4 or EmuTOS, with or without MMU,
> > > > > with Hatari default config or my own.
> > > > >
> > > > > (Dry Egg game, which also worked only with EmuTOS,
> > > > > does still work.)
> > > > >
> > > > > I don't understand what could have changed, to
> > > > > break that demo also with older Hatari versions.
> > > > >
> > > > > Maybe it's wall clock sensitive?
> > > > >
> > > > >
> > > > >      - Eero
> > > > >
> > > > > PS. I'll push update to compatibility list &
> > > > > release notes after I've done some additional
> > > > > testing.