Dear Paul,
I've investigated further on the problem I described last week (in the thread
"owtcl and writing data").
It seems to be related to EMC: Nearly every time I switch on a large 240/24V
AC transformer I need for my project, I get a single error of the kind I
described. But sometimes, it is even a cascade of such errors, which I can't
bring into connection to any action I took (not). Maybe, it was the
fluorescent light on last week, but today, I didn't turn them on and still
got cascades of such errors (over about 1 minute).
Then again, everything is fine for a couple of minutes.
I checked for USB errors with dmesg, and got very few USB disconnects (about 1
of 30 times), but no other USB link layer errors. On the most tries, only the
1-wire seemed to be affected.
I tested all this with the tcl script I posted before, and put an
OW::finish
OW::init usb1
into the catch sequence to restart on error. Slow, but worked.
As there is little to do against EMC, I would suspect to change the software a
way it automatically reinitialize the connections if there is an (until now)
unrecoverable error. That leads me to following questions:
1. Is there any way to detect an "unrecoverable" error on bus side?
2. I want to use owserver. You offered to change owserver to restart the
connection automatically: How is the development status for this?
3. Is there any way to process the init sequence faster? For USB errors, it
would not be so dramatic if it takes 3 to 5 seconds to recover, as I expect
them to be very rare. However, the 1-Wire error happens *every time* a big
inductive load is switched near the device, so a faster recovery would be a
big help.
Kind regards
Jan
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