Hello Colin,
I've found a workaround - only use an other path to read from
owfs-server and dont need any retry anymore.
Workaround is to use /bus.x/<ADDRESS>/<VALUE> instead of /<ADDRESS>/<VALUE>.
Have you a possibility to try, if this is working on your system also?
I dont found the reason for that, but it works stable (with 0 retry)
since 24 hours (14 devices, on 4 buses, read/write every 20 seconds) on
my owfs-server.
So I hope, it would be possible to get this working stable also with
access over /<ADDRESS>/<VALUE>
Could it have do something with this hint in the kernel-driver from 1w-gpio
https://www.kernel.org/doc/Documentation/w1/w1.generic
=========
...
It is possible that between 1. and 2. w1 master thread will reset bus for
searching
and slave device will be even removed, but in this case 0xff will
be read, since no device was selected.
...
=========
I've seen in the debuglevel-log from owfs-server that this is searching
on each bus-master when I access with /<ADDRESS>/<VALUE>.
eni
On 05.11.2016 09:08, Colin Law wrote:
On 5 November 2016 at 07:03, eni <enrico.hoepf...@gmx.de
<mailto:enrico.hoepf...@gmx.de>> wrote:
Hello Colin,
I've exactly the same problem, also with raspberry pi and
w1-kernel-modul.
I've implemented a retry on client-side (OWNet.pm), this works
mostly in the
second try, maximum at the fourth time.
could it be there is a timing problem with w1-kernel-modul?
I suspect, as Jan suggested that it is due to the fact that the kernel
uses 'bit banging' which means that it drives the 1-wire directly
under s/w control. This is inherently unreliable as occasionally
something more important will come along that the processor needs to
do and the 1-wire signal gets disrupted. I think probably best just to
accept that retries are necessary when driving the bus in this way.
Colin
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