Subject:
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Re: NQC vs Spirit communication speed
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Fri, 11 May 2001 20:33:35 GMT
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Viewed:
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4871 times
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hi John,
I'm curious to see your "Fakespirit" class.
At this moment I only need a limit set of commands, so I send by a couple of simple routines to my serial commport driver (indepent thread).
Here is the basic code I use, timing is very a stable (the measured times are given for the poll-command).
tim:=now;
sendstring(data);
memo2.lines.add(inttostr(round((now-tim)*24*3600*1000)));
//this always gives 60 msec
tim:=now;
doing some calculations ....
inputtimeout:=receive_len*10; {normally 5 msec/byte, so 10 ms/byte should be enough}
navail:=ReadData(p,receive_len); {waits till receive_len bytes or inputtimeout}
memo2.lines.add(inttostr(round((now-tim)*24*3600*1000)));
//at this moment another 50 msec is reported
//and of course here I've to check the whole string (except the first byte which isn't always $55 !!!)
John Hansen wrote:
> This is more a general RCX communication question, actually. As I mentioned
> here previously, I've ported the NQC communication code to Delphi for the
> purposes of modifying RcxCC to not use the Spirit OCX.
>
> At present I have a version of RcxCC that does everything the original
> version does without ever using Spirit. It uses my "FakeSpirit" class that
> uses my port of the NQC RCX_Link, RCX_Cmd, and Serial code. I'm relatively
> satisfied with the results. But there is a slight problem.
>
> The original RcxCC (which uses Spirit) appears to communicate with the brick
> much faster than my modified RcxCC does. Polling for information using my
> Spirit replacement is much slower than doing so via Spirit. I've profiled
> the application and the vast majority of the time is spent in the serial
> class' read method. It appears to retry a lot - almost always (if not
> always) failing on the first send. But Spirit somehow seems to do the exact
> same operations in virtually no time at all.
>
> Can anyone shed some light on this matter?
>
> Thanks in advance for your help,
>
> John Hansen
Stef Mientki
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Message is in Reply To:
 | | NQC vs Spirit communication speed
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| This is more a general RCX communication question, actually. As I mentioned here previously, I've ported the NQC communication code to Delphi for the purposes of modifying RcxCC to not use the Spirit OCX. At present I have a version of RcxCC that (...) (25 years ago, 11-May-01, to lugnet.robotics.rcx.nqc)
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