Hello, > >> I am having troubles getting buffers to work with IIO. Querying raw > >> data from devices works well via sysfs, but buffered input from ADCs > >> does not work. > > > > how do you setup the buffer from userspace? see e.g. > > http://events.linuxfoundation.org/sites/events/files/slides/lceu15_baluta.pdf, > > page 21 > > I used what iio_readdev does, but setting up the buffer manually on > sysfs (using a sysfs trigger as current_trigger), I get > "echo: write error: Invalid argument" when trying to enable the buffer > (writing 1 to buffer/enable). > > I tried this on the iio_dummy module, enabling the in_voltage0 channel. this is what I use (Ubuntu, Linux 4.4) and it works; maybe the trigger name you use is incorrect? modprobe iio_trig_sysfs modprobe iio_dummy (make sure CONFIG_IIO_SIMPLE_DUMMY_BUFFER is #defined) cd /sys/bus/iio/devices/iio_sysfs_trigger echo 123 > add_trigger cd /sys/bus/iio/devices/trigger0 cat name # should give sysfstrig123 cd /sys/bus/iio/devices/iio:device0 echo sysfstrig123 > trigger/current_trigger echo 1 > scan_elements/in_voltage0_en echo 1 > buffer/enable regards, p. -- Peter Meerwald-Stadler +43-664-2444418 (mobile) -- 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
