On Wed, Aug 12, 2015 at 9:14 AM, <c...@isbd.net> wrote: > Robert Nelson <robertcnel...@gmail.com> wrote: >> On Tue, Aug 11, 2015 at 3:42 PM, <c...@isbd.net> wrote: >> > Robert Nelson <robertcnel...@gmail.com> wrote: >> >> On Fri, Aug 7, 2015 at 11:36 AM, <c...@isbd.net> 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: linux-...@vger.kernel.org >> >> 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* >> > Well, very nearly! :-) > > If I 'cd /sys/bus/iio/devices/iio*' I get to > '/sys/bus/iio/devices/iio:device0', > is there any way of knowing that it's 'iio:device0'? It's still sort > of clumsy doing a Python walk to find the files.
well the "tscadc" label: https://github.com/beagleboard/linux/blob/3.8/firmware/capes/BB-ADC-00A0.dts#L37 is here: root@beaglebone:~# cat /sys/bus/iio/devices/iio\:device0/name tiadc Regards, -- Robert Nelson https://rcn-ee.com/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
