Subject:
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Re: Sharp GP2D02 and assembly language
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 23 Feb 1999 20:14:15 GMT
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Original-From:
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Thomas Heidel <theidel@/NoSpam/advis.de>
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Viewed:
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3231 times
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Hi,
I have the same problem. For now I don't care since
the GP2D02 is the only thing connected to an digital output.
I am using the following:
Include:
subroutine_get_userval:
ldab USERVAL ; load USERVAL to d register
clra ; clear upper byte
rts ; return value in d
to Fred's libexbd.asm; read it from an ic-program and pass it
to your gp2d02-routine.
I agree, it is not very nice too, and you can't use it from
an assembler routine either. The alternative way would be to
reserve a byte in pcode_hb.asm (like "beeptone" at 0x26).
Even less sexy :-(
... unless Fred would do it in version 2.8x of pcode.asm ;-)
Thomas.
Barry Brouillette wrote:
>
> Hi,
> I've written a short assembly language routine to access the Sharp GP2D02
> sensor and it works just great but... I have one question.
>
> Since I use the expansion board's digital outs to control the sensor I
> need to make sure my routine doesn't stomp on any other digtal outs in
> the process. I used Fred's libexbd.asm to see how to do digital outputs.
> Apparently, you can't read the output latch back in so he keeps a local
> variable USERVAL to keep track of which outputs are set.
>
> My question is this: How can my assembly program access Fred's USERVAL so
> that my program can also know what bits are set by Fred's set_digital_out
> routine?
>
> I assume that I could simply #include libexpd.asm in my program and use
> the resulting .icb file in place of both his libexpbd.icb and my
> GP2D02.icb but that seems kludgy to me and difficult to explain when
> posting the code. Any ideas?
>
> Barry
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Message is in Reply To:
 | | Sharp GP2D02 and assembly language
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| Hi, I've written a short assembly language routine to access the Sharp GP2D02 sensor and it works just great but... I have one question. Since I use the expansion board's digital outs to control the sensor I need to make sure my routine doesn't (...) (28 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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