Subject:
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RE: Datalog in Delphi
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 6 Jan 1999 17:11:56 GMT
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Original-From:
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Andy Walker <andy@ajwalker.freeserve.co%StopSpam%.uk>
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Viewed:
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923 times
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On Wednesday, January 06, 1999 6:21 AM, Simen Svale Skogsrud
[SMTP:simen@mop.no] wrote:
> I have made a simple 25dpi monochrome scanner with my kit. Using NQC i have
> written a small program for the RCX that advances the scanner one line and
> reads aproximately 170 samples from the light-sensor while running it on a
> carriage over the image. These samples are stored in a datalog which a
> Delphi application on my PC then downloads before telling the RCX to go on
> scanning the next line.
>
> I have trouble getting the RCX to send the whole datalog in one transfer.
>
> I do like this:
>
> First I ask the RCX how many samples it got by reading the first entry of
> the datalog:
>
> scanline := Spirit.UploadDatalog(0,1);
> datamount := scanline[2,0];
>
> this is typically 170-180. If I then ask the RCX to upload it all by
> writing
>
> Spirit.UploadDatalog(1,170) // or any other value more than 50
>
> i get an empty array as result. I have gotten around this by uploading it
> in chunks smaller than 50 entries. This works well, but I can see no reason
> why this should be, it is probably sub optimal as well. I find no
> references to this problem in the Spirit documentation from Lego. Any
> ideas?
>
> thank you
> Simen
If you check the parameter table #2 in the Spirit documentation it species that
the valid range for the size parameter is 1-50, although this is not mentioned
on the page describing the upload function. I guess there's just no way round
it.
Cheers,
Andy
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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