Am 05.09.2016 um 17:23 schrieb Colin Law:
> As in an earlier thread I am using an DS18B20 directly connected to
> GPIO pins of a Pi Zero with 1.5k pullup, operating at 3.3v. Owserver
> is version 3.1p1-6 from raspbian testing.
>
> I have specified
> dtoverlay=w1-gpio,gpiopin=4
> and done
> sudo modprobe w1-gpio pullup=1
>
> This basically works, both when connected in parasitic and 3 wire mode
> but about 1 in 20 reads I get a read error (in both modes).
>
That's something you have to take provisions for. OWFS doesn't retry
itself. I have spurious errors in my machines too (of course, a lot of
chips and cabling) with I²C and USB host adapters.
With the bitbanging host, I think it's connected to CPU frequency
scaling and other powersave measures. You could try to disable all this
and check if it gets better.
But I would just retry. YOu have to in any case for other errors.
Kind regards
Jan
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