Re: Using 1-wire on ODROID C2

[Paul Goyette <paul%whooppee.com@localhost>]

On Mon, 19 Sep 2022, Vincent DEFERT wrote:

> I found this thread, which is not very encouraging:
> http://mail-index.netbsd.org/tech-embed/2021/07/thread1.html
>
> I've created a sys/arch/evbarm/conf/GENERIC64.local  with the following 
> lines:
>
>     # 1- Wire support
>     gpioow*     at gpio?
>     onewire*    at gpioow?
>
>     # 1-Wire devices
>     owtemp*     at onewire?            # Temperature sensors
>
> and I'm rebuilding the kernel and modules.
>
> However, once I'll have an owtemp kernel module, I still don't know what to 
> do with it. :/
> That's where an example would help.

You won't do anything with it directly.  You will be able to monitor
the temperature sensor value using the envstat(8) utility.


> Once I'll have a working device, the man pages related to envsys seem clear 
> enough.
>
> On 19/09/2022 23:43, Vincent DEFERT wrote:
> > I could use owtemp/envsys, but I can't find any example of use, and no 
> > documentation except the man pages.
> >
> > On 19/09/2022 23:33, Michael van Elst wrote:
> > > vincent.defert%posteo.net@localhost (Vincent DEFERT) writes:
> > >
> > > > There's no /dev/onewire0, and I have no clue as to how is my application
> > > > is supposed to communicate with the DS18B20 connected to this GPIO line.
> > > There is no userland interface for onewire(4).
> > >
> > > So far there are two users of onewire(4):
> > >
> > > - the owtemp driver for e.g. a DS18B20 which attaches as a sensor to
> > >    the envsys framework. You can query the sensor with the envstat 
> > > command.
> > >
> > > - a rudimentary oweeprom driver for e.g. a DS2430, that just dumps the 
> > > content
> > >    to the console.
>
>
> !DSPAM:6328e6ba141341182910779!

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