Robert Nelson <[email protected]> wrote:
> On Tue, Aug 11, 2015 at 3:50 PM, Robert Nelson <[email protected]>
> wrote:
> > On Tue, Aug 11, 2015 at 3:42 PM, <[email protected]> wrote:
> >> Robert Nelson <[email protected]> wrote:
> >>> On Fri, Aug 7, 2015 at 11:36 AM, <[email protected]> wrote:
> >>> > I have a BBB running Debian GNU/Linux 7, 3.8.13-bone47 kernel. I.e.
> >>> > pretty standard.
> >>> >
> >>> > My raw ADC files are to be found at:-
> >>> >
> >>> > /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0/in_voltage0_raw
> >>> > /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0/in_voltage1_raw
> >>> > /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0/in_voltage2_raw
> >>> > /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0/in_voltage3_raw
> >>> > /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0/in_voltage4_raw
> >>> > /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0/in_voltage5_raw
> >>> > /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0/in_voltage6_raw
> >>> > /sys/devices/ocp.3/44e0d000.tscadc/tiadc/iio:device0/in_voltage7_raw
> >>> >
> >>> > Currently I use a find() function written in python which walks the
> >>> > /sys/devices tree to find these files, but it's very slow. If I hard
> >>> > code the file names how often, if at all, will they need changing?
> >>> >
> >>> > ... and/or is there an easier way to find them, i.e. is there a
> >>> > configuration file somewhere that tells me where they are (or at least
> >>> > the non-constant bits of the path)?
> >>>
> >>> You should also see them here:
> >>>
> >>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/ABI/testing/sysfs-bus-iio#n91
> >>>
>
> >>>
> >>>
> >>> What: /sys/bus/iio/devices/iio:deviceX/in_voltageY-voltageZ_raw
> >>> KernelVersion: 2.6.35
> >>> Contact: [email protected]
> >>> Description:
> >>> Raw (unscaled) differential voltage measurement equivalent to
> >>> channel Y - channel Z where these channel numbers apply to the
> >>> physically equivalent inputs when non differential readings are
> >>> separately available. In differential only parts, then all that
> >>> is required is a consistent labeling. Units after application
> >>> of scale and offset are millivolts.
> >>>
> >> That isn't really what I was asking for Robert.
> >
> > Actually it was...
> >
> > Walk:
> >
> > /sys/bus/iio/devices/iio*
>
> You can get one name here:
>
> root@beaglebone:~# cat /sys/bus/iio/devices/iio\:device0/name
> tiadc
>
What I want though is the names of the files with the values in, i.e.:-
/sys/bus/iio/devices/iio:device0/in_voltage0_raw
> but "device0" should also be set-able somewhere..
>
I don't want to set it, I just want to know its value! :-)
Thanks though, you've taken me to a much faster way of finding the
files at least.
--
Chris Green
ยท
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