[A89] Re: interrupts
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[A89] Re: interrupts
why not make it so it catches the key interupt like normal but clears it if
it hasn't been the duration of time for the speed it is set on?
----- Original Message -----
From: "asm viper" <asmviper@hotmail.com>
To: <assembly-89@lists.ticalc.org>
Sent: Thursday, April 04, 2002 11:16 PM
Subject: [A89] Re: interrupts
>
> Thanks for the help! The reason i wanted to know about interrupts is that
i
> created a program called "bincount" and uploaded it to ticalc.org (I know,
i
> know, it's really laughable but its the first thing ive done in a very
long
> time). Anyway, it has 8 different speed settings. The problem is, when i
> slow down and i am already in a fast mode, it slows down really fast
because
> there is no delay between consecutive key inputs. When I try to speed up
> from slow mode, it takes a long time because there is a large delay
between
> each time the keyboard is read. If i used interrupts for the key input,
the
> time between key inputs would be constant, and the user would have a much
> easier time controlling the program. I have a pretty good idea about how
> interrupts work, but its been a while since i looked at asm. The biggest
> thing is just figuring out the specific details and syntax for MC68000
> assembly. Thanks again!
> nwr
>
>
> >From: Olle Hedman <alh@home.se>
> >Reply-To: assembly-89@lists.ticalc.org
> >To: assembly-89@lists.ticalc.org
> >Subject: [A89] Re: interrupts
> >Date: Thu, 04 Apr 2002 11:20:28 +0200
> >
> >
> >At 07:03 2002-04-04, you wrote:
> >
> > >hi all
> > >does anyone know where i can find a tutorial on interrupts or some
source
> > >code that is easy to understand about interrupts? ive looked at the
> >source
> > >for gray4lib and gray7lib, but its sort of confusing. i seem to
remember
> > >seeing a tutorial somewhere. a tutorial on grayscale might be helpful.
> > >thanks everyone!
> >
> >What is it you want to do with interrupts?
> >
> >I don't know of any tutorial but reading in the below could help you.
> >Basic usage info about the TIGCC interface to it is documented in the
entry
> >DEFINE_INT_HANDLER
> >but I suspect you want to use it in asm. Reading it could help in some
> >understanding anyway. (Depending on how much you already know) The
> >order-of-doing-things is basicly the same in both C and asm.
> >
> >Info about what interrupt does what, and how to control their behaviour,
> >you can find in J89hw.txt that you can find on my site
> >http://alh.dhs.org/ti89/ (which is up again after two months downtime!
> >horray! :)
> >
> >If you look at the enum AutoInts in the TIGCC docs, you find what
addresses
> >the different interrupt vectors are stored at.
> >Those vectors are nothing more then memorypositions where you store the
> >address of the interrupt function you want to run.
> >Then just write your interrupt function like any other subroutine, but
end
> >it with RTE instead of RTS, (or JMP to the old interrupt vector that you
> >have stored somewhere, to run the standard interrupt. the old will RTE
for
> >you (same as ExecuteHandler() in tigcc))
> >
> >If you want to write a link interrupt (autoint 4) that totally replaces
the
> >standard, special care must be taken to acknowledge the interrupt
properly,
> >or else the calc will lock up. Details in J89hw.txt.
> >
> >I don't know if this helps you any, please tell :)
> >I could probably write (or find somewhere on my hd) an example source if
I
> >knew more about what it is you want to do.
> >I do have a file that uses a combo of C and asm for interrupts in
hidekstat
> >that can be found in
> >http://d188.ryd.student.liu.se/ftp/calculator/ti89/source/
> >(It is a small hack to hide the 2ns, alpha, shift, diamond markers when
> >using AMS ngetchx and dialog functions.)
> >But I doubt it is very easy to understand. It hooks itself both before
and
> >after the standard interrupt, instead of just before that is the standard
> >way. This might look confusing if you don't know the details of how the
68k
> >handles interrupts.
> >
> >///Olle
> >
> >
>
>
>
>
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