Subject:
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Re: Basic assembler and downloader question
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 9 Jan 2001 05:55:22 GMT
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Viewed:
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788 times
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I tried using dl.exe and the download appeared to work. However, the LED
still did not turn on. Is something wrong with my code? Perhaps the RAM is
not accessible at this point as the chip is in bootstrap mode?
Again here is the listing (with the added loop thanks to Fred):
ORG $8000
LDAA #$40
STAA $1000
LOOP BRA LOOP
ORG $FFFE
FDB $8000
Seems simple enough to me. I would think that resetting the board would
then light the LED. Again I can easily go over to IC and type:
poke(0x1000, 0x40);
and the light will come on as expected. I will greatly appreciate any
further feedback to get me on the right track.
Thanks,
Brian
In lugnet.robotics.handyboard, Fred G. Martin writes:
> Brian
>
> Try using dl.exe rather than dlm.exe
>
> Also, put a line
>
> LOOP BRA LOOP
>
> after you store the value in the Port A. otherwise the 6811 will
> happily execute whatever's next in memory.
>
> Fred
>
> In your message you said:
> > Hello All,
> >
> > I recently completed assembly of my Handyboard and now I'm excited to be
> > moving into the coding realm (which is more my area). I was able to get
> > Interactive C to communicate with the board.
> >
> > However, given my nature of wanting to understand things more fully before
> > enjoying myself, I decided to write some simple assembly code to mimic the
> > part of the IR test done during the assembly of the handyboard ( poke(1000,
> > 0x40) or something like that) that essentially turned on the IR LED.
> >
> > I coded up this simple .asm file and compiled it using the Motorola
> > assembler (as11.exe)
> >
> > ORG $8000
> > LDAA #$40h
> > STAA $1000
> > ORG $FFFE
> > FDB $8000
> >
> > I then ran dlm (in DOS mode as hbdl has not worked at all for me) using this
> > command line:
> >
> > dlm irtest.s19 -256
> >
> > Everything seems to download fine but I get some error messages at the end
> > of the dlm run such as the ones that follow:
> >
> > Board memory error: wanted 86, got 3e at address 8000
> > Board memory error: wanted 40, got 86 at address 8001
> > etc...(3 more similar errors)
> >
> > The 86 and 40 are the opcodes for what should be at those addresses and it
> > would seem that dlm is checking to make sure they are there but they are not • .
> >
> > Obviously the IR LED never comes on like I want it to. Can someone please
> > tell me if my error is in my irtest.asm file listing I gave or in my usage
> > of dlm.
> >
> > Thanks in advance,
> >
> > Brian
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