On 5/5/2015 5:11 PM, Xander Huff wrote:
Hi Lars,
I've been working on transitioning one of our hardware devices over from using
the out-of-tree hwmon driver that Xilinx used to provide to the xadc driver you
added upstream, but I've been having trouble accessing our connected auxiliary
channels. I've found that for all channels I've tested, after multiplying the
raw value by the scale value (0.244140625), the resulting mVs are always about
10 percent less than what we expect them to be. (2.9V instead of 3.3V, 5.4V
instead of 6V, etc.). I'm interested in any tips you may have on how to debug
this issue.
Nevermind, it turns out I had somehow transcribed the scale value incorrectly
for my testing. After modifying my test to directly use the scale values from
our target, the resulting voltages came out as expected
--
Xander Huff
Staff Software Engineer
National Instruments
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