On 5 November 2016 at 07:03, eni <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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