Thank you for your investigation. Let me see if I can fix it this weekend.
Michael Markstaller <m...@elabnet.de> wrote:
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>Ok, digging some deeper today.
>
>Preface: these were found&analyzed using 2.8p14 on my Ubuntu
>11.04/32-Desktop, one DS9490, 5cm cable a parasite DS18B20 and one
>DS2438 (similar MS-TH). NOTHING else on the USB, i7..
>Should say: it is also very unstable on very short buses right now. I
>also added a ton of debugging-output to get this picture a little
>clearer..
>
>
>My current assumptions:
>#1) The source-problem: reset_errors:
>These happen due to timeouts ("never got idle") in DS9490_getstatus
>doing an POR of the DS2490 which leads to problem #2 then.
>The reason (again assumed!)
>
>- - DS9490_HaltPulse isnt working always (or accepted, delivered,
>whatever) in lets say at least 10% of the cases; simply doubling the
>call makes the trouble appear just 50% later..
>(Question: why is an infinite SPU-period (0) and not the builtin
>SPU-duration of the chip used? Maybe there's a good reason for, but I
>wondered..)
>
>- -> The DS2490 stays in SPU then (measured) and owfs thinks of a
>timeout due to it's never saying "idle" anymore)
>
>
>#2) no initialization of MODE registers and speed etc. is done after
>this reset.
>(I don't know where this code should go but it surely needs to be done
>after a full Power-on-reset..)
>
>
>#3) I'm still investigating, now with long lines, is then probably the
>initially reported problem:
>(but it makes no real sense to troubleshoot, as long as it fails
>within minutes with the above, simple setup)
>The reconnect doesn't do anything at all as far as I can see when the
>bus is getting into a "zero-ID" state (Attempting RESET on null bus):
>Just a log-excerpt:
>- --- cut ---
> DEBUG: ow_reset.c:(48) Reset error. Reconnection 3/2
> DEBUG: ow_transaction.c:(84) select = 1
> DEBUG: ow_cache.c:(956) 28 C5 0E EC 01 00 00 38 size=4
> DEBUG: ow_cache.c:(1083) Search in cache sn 28 C5 0E EC 01 00 00 38
>pointer=0xb7746c64 index=-2 size=4
> DEBUG: ow_cache.c:(1119) Value not found in cache
> DEBUG: ow_select.c:(66) Selecting a path (and device)
>path=/28.C50EEC010000/temperature10 SN=28 C5 0E EC 01 00 00 38 last
>path=00 00 00 00 00 00 00 00
> DEBUG: ow_select.c:(79) Continuing root branch
> DEBUG: ow_ds9490.c:(513) Attempting RESET on null bus
> DEBUG: ow_reset.c:(48) Reset error. Reconnection 4/2
>- --- cut ---
>
>My programming skills are limited but as far as I can see DS9490_reset
>returns BUS_RESET_ERROR on (Attempting RESET on null bus) then and
>nothing else happens to really recover or simply delete (?) a lost one
>and maybe let the usb-scanner rediscover it..
>
>And again: as already said: the core symptom (recovery/reconnect) also
>happens with 2.8p2 already but *much less frequently*
>(though still dozens times a day, an external process restarting
>owserver on disappearing DS9490 after one minute does the job so far
>but thats: a big quirk..)
>
>
>and on another thing:
>Am 07.02.2012 14:45, schrieb Mark Richards:
>> Yours is not a new idea.. however there are good reasons for
>> making physical adjustments to the one wire net.
>I agree. But I'm trying to run 1-Wire in many "unknown" environment ;)
>And we're really talking about a software-problem about recovery here,
>otherwise it wouldn't work for hours after an owserver-restart..
>
>
>best regards
>
>Michael
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