Re: [MiNT] No keyboard with GEM=ROM

["Helmut Karlowski" <helmut.karlowski@ish.de>]

Am 12.09.2010, 18:15 Uhr, schrieb Vincent Rivière  
<vincent.riviere@freesbee.fr>:

> > The MiNT-keyboard-handler needs a certain timer-interrupt to occur.
>
> Sorry but that stuff is still obscure.

Yep!

> I looked further into MiNT's keyboard handling. I saw that the interrupt
> handler used for keyboard data is ikbd_scan() inside sys/keyboard.c.
> Basically, it puts the new scancode into the scanb buffer and it calls
> addroottimeout(IkbdScan).
>
> If I understand well, the interrupt handler does a minimal amount of  
> work,
> then addroottimeout() asks MiNT's main process to do the remaining job on
> next task switch, isn't it ?

Yep! This timeout-stuff is also important for key-repeat.

> And that task switch never happens in GEM programs, maybe because the ROM

Also true.

> AES runs in supervisor mode, do it doesn't work inside form_do() ?

Maybe - I think I understood it better sometime ago. Fact is addrootimeout  
never returns.

> Well, these are suppositions.
> What could be the clean fix ?

I'd suggest to add some yield() in Emutos, but that is not really clean.

> NB: I saw the direct call to IkbdScan() when WITH_SINGLE_TASK_SUPPORT is
> defined.

That's why I have keyboard in GEM.

--
Helmut Karlowski