On Mon, Oct 07, 2013 at 01:53:17PM +0200, Sebastian Andrzej Siewior wrote: > Hi Zubair, > > I have here am335x-evm board. The output of voltage4 (via `cat > /sys/bus/iio/devices/iio\:device0/in_voltage4_raw´) returns values in > the range 570…580. I tested the continuous sampling mdoe by executing > the following commands: > > |echo 1 > /sys/bus/iio/devices/iio\:device0/scan_elements/in_voltage4_en > |echo 25 > /sys/bus/iio/devices/iio\:device0/buffer/length > |echo 1 > /sys/bus/iio/devices/iio\:device0/buffer/enable > |sleep 1 > |echo 0 > /sys/bus/iio/devices/iio\:device0/buffer/enable > |cat /dev/iio\:device0 > iio > |hexdump -C iio > > and the output is: > |00000000 37 02 92 02 1f 07 0a 06 20 06 31 06 2f 07 2a 07 > |00000010 2b 07 2d 07 2c 07 28 07 2c 07 2b 07 2b 07 0c 06 > |00000020 21 06 32 06 2e 07 2c 07 2a 07 2a 07 2c 07 2b 07 > |00000030 29 07 27 07 28 07 29 07 2a 07 0d 06 21 06 35 06 > > The first entry is in the range that I would expect. The second is > slitghly higher. The third and following entries are out of range. Have > you observed something like that? Is my testing close to what you have > done or did I make an mistake here? I can't read the hex dump easily.. Keep in mind that the driver now uses 16 bit storage. Also, I used generic_buffer.c after removing the trigger checks. The driver would report stable values for 1.8V on one channel and gnd on another channel. Hope this helps ZubairLK > > Sebastian -- 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
