Subject:
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Re: LinuxPPC and "No response from RCX" problem
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Sat, 4 Nov 2000 19:49:37 GMT
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Viewed:
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1865 times
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In article <G3IDHA.Cpo@lugnet.com>, "Chris"
<chris@starforge.demon.co.uk> wrote:
> In lugnet.robotics.rcx.nqc, Dave Baum writes:
> >
> > Do you have a second computer (running a different OS) with a terminal
> > program handy? If so, hook the two up with a null modem cable. Hack
> > RCX_Link::Open() to write an ascii string (e.g. "Hello World") to the
> > port after opening and setting the speed. Make sure the terminal on the
> > second computer is set for 2400 baud, 8 data, 1 start, 1 stop, odd
> > parity. See if "Hello World" comes through...if not, then the parity is
> > probably not happening (try using no parity on the terminal to verify).
>
> This helped me track down the problem - the minute I add the odd parity
> bit the serial driver changes the word length from 8 to 7. Doesn't look
> like I can do much about it from the Linux side either.
This may not be a driver bug - it may be a hardware limitation.
AFAIK, parity is most commonly used with 7 bit words - support for a
ninth bit (8 data plus parity) is poor or non-existant on some UARTs.
Dave
--
reply to: dbaum at enteract dot com
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Message has 1 Reply:
 | | Re: LinuxPPC and "No response from RCX" problem
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| (...) Nope, I've written a program to send messages to the RCX (like the send.c program on RCX Internals) for the Amiga side - I can boot into LinuxPPC or AmigaOS - and that works fine. If I can work out the format of the image files nqc generates (...) (24 years ago, 5-Nov-00, to lugnet.robotics.rcx.nqc)
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Message is in Reply To:
| | Re: LinuxPPC and "No response from RCX" problem
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| (...) This helped me track down the problem - the minute I add the odd parity bit the serial driver changes the word length from 8 to 7. Doesn't look like I can do much about it from the Linux side either. :( Thanks for the help everyone, looks like (...) (24 years ago, 4-Nov-00, to lugnet.robotics.rcx.nqc)
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