Incorrect scaling on NetBurner A2D values.
Posted: Sun Feb 19, 2012 8:21 am
This problem was reported here over a year ago, and it's not been fixed yet (part or Docs)
http://forum.embeddedethernet.com/viewt ... =a2d#p3738
When you use the SBL2e's GPIO Server Port to read the A2D values on pins 7-10, the value you get back is NOT scaled 0-4095 as ALL the documentation shows.
I just started using this part and it's actually scaled 0-32767
It's pretty hard NOT to notice.... when the value you get back is MUCH larger than 4095
Apparently there is some Divide by 8 that's not getting performed in the factory shipped firmware (maybe as part of the internal averaging).
I've run the numbers and the conversion is accurate with an extra divide by eight done externally.
Clearly this has slipped past all the tests for the last 16 months.
PLEASE UPDATE the FIRMWARE or the MANUAL.
Phil.
Note: Thanks to Vance G and rnixon for clearing this up here on this forum.
http://forum.embeddedethernet.com/viewt ... =a2d#p3738
When you use the SBL2e's GPIO Server Port to read the A2D values on pins 7-10, the value you get back is NOT scaled 0-4095 as ALL the documentation shows.
I just started using this part and it's actually scaled 0-32767
It's pretty hard NOT to notice.... when the value you get back is MUCH larger than 4095
Apparently there is some Divide by 8 that's not getting performed in the factory shipped firmware (maybe as part of the internal averaging).
I've run the numbers and the conversion is accurate with an extra divide by eight done externally.
Clearly this has slipped past all the tests for the last 16 months.
PLEASE UPDATE the FIRMWARE or the MANUAL.
Phil.
Note: Thanks to Vance G and rnixon for clearing this up here on this forum.