Subject:
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lego USB IR Tower
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 7 Jul 2002 21:05:33 GMT
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Viewed:
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693 times
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Hi all,
I tried out the Ryan Simmons's instructions in order to have my lego USB
IR tower working under Linux OS. Everything seems to have been installed
properly but when I tried to download legOS firmware with firmdl3 I
got the following output:
command: firmdl3 --debug -s ../../boot/legOS.srec
output:
--------------------------------
mode = slow
sendrecv 1:
recvlen = 0
status = no response from rcx
recvlen = 0
status = no response from rcx
recvlen = 0
status = no response from rcx
recvlen = 3
R 0000: ff 00 00
status = bad response from rcx
recvlen = 3
R 0000: ff 00 00
status = bad response from rcx
status = bad response from rcx
mode = fast
sendrecv 1:
recvlen = 0
status = no response from rcx
recvlen = 0
status = no response from rcx
recvlen = 0
status = no response from rcx
recvlen = 0
status = no response from rcx
recvlen = 0
status = no response from rcx
status = no response from rcx
firmdl3: no response from rcx
---------------------------------
It seems that every time firmdl reads from the usb driver to get a
response, if not a timeout occurs (this is most frequent case), the read
bytes would be lesser than the threshold of 5 bytes. This threshold
(probably the smallest valid packet length) is checked inside
*rcx_recv* which resides in *rcx_comm.c*. The related code follows:
if (msglen < 5 || (msglen - 3) % 2 != 0)
return RCX_BAD_RESPONSE;
I tried also to increase the timeout but nothing essential happened.
Has anyone experienced something alike or succeeded in
making this patch working? Any help is welcome.
Regards,
Dimitrs Economou.
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