lars, I was under the impression that flag gets added automatically by iio_triggered_buffer_setup (industrialiio-triggers.c:77) - I actually am now able to enable the scan_element after changing my channel .channel and .scan_index to 0 (trying to match exactly the other drivers.) When i run general_buffer (from the docs dir) with that scan element enabled it can no longer read the trigger (Could not open /trigger/current_trigger Failed to write current_trigger file) - this succeeds if that scan_element is not enabled. Is there a guide anywhere that captures the steps to setup and read from a driver that perhaps I missed? -c On Wednesday, February 27, 2013 at 12:34 PM, Lars-Peter Clausen wrote: > On 02/27/2013 06:15 PM, Chris Micali wrote: > > Lars, > > > > Thanks.. when I write 1 to scan_elements/in_voltage0_en via iio_cmdserv i get -2, from shell (echo 1>) i see write error: Invalid argument. No output in dmesg that indicates what the error is/could be though. > > > > -c > > In your driver you commented out the INDIO_BUFFER_TRIGGERED mode flag, did > you add that back? Without it this won't work. > > - Lars > > > > > > > On Wednesday, February 27, 2013 at 11:34 AM, Lars-Peter Clausen wrote: > > > > > On 02/27/2013 05:21 PM, Chris Micali wrote: > > > > Hi Lars, > > > > Thanks a lot for getting back to me. I've attached my code - it's pretty simple, I just copied an existing driver. As I mentioned individual reads are working fine (if i cat in_voltage0_raw) but buffered reads are failing. I've tracked the issue to industrialio-buffer.c in iio_compute_scan_bytes() which always returns zero because, i believe, the mask is 0. I haven't been able to find any docs on what 'scan masks' mean but I have seen a few drivers that supply available scan masks. Should I be specifying scan masks? > > > > Thanks! > > > > -chris > > > > > > > > > > > > > > > Hi Chris, > > > > > > You need to enable the channels you want to sample in sysfs. If you are > > > using the command server you can for example do this by doing a 'write > > > ads... scan_elements/in_voltage0_en' > > > > > > - Lars > > > > > > > > > > > > > > > > > > On Wednesday, February 27, 2013 at 11:07 AM, Lars-Peter Clausen wrote: > > > > > > > > > On 02/26/2013 08:56 PM, Chris Micali wrote: > > > > > > Hello Lars, > > > > > > > > > > > > I'm doing a bit of hacking on a IIO driver based on some of your drivers on a 3.8 kernel (specifically writing a driver for a TI SPI adc.) I've been able to get a driver up and working such that I can read directly from the in_voltage0_raw on sysfs and get the correct values but I can't seem to get buffered access working (via iio_cmdsrv.) I've had a hard time finding any docs on this stuff and I was wondering if you could give me any pointers on where to look or who else perhaps to ask about this stuff? Any pointers would be very much appreciated! > > > > > > > > > > > > Thanks, > > > > > > Chris > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Hi, > > > > > > > > > > I'm afraid except for the the documentation in > > > > > drivers/staging/iio/Documentation/, the kernel doc comments and the skeleton > > > > > driver (drivers/staging/iio/iio_simple_dummy*) there is not much additional > > > > > documentation available. > > > > > > > > > > The general place to ask questions about IIO is the IIO mailinglist. I've > > > > > put it on CC, hope you don't mind. > > > > > > > > > > I think we can help you best if you post your code. > > > > > > > > > > - Lars -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
