- From: David Antliff <dave.antliff_at_paradise.net.nz>
- Date: Tue, 27 Aug 2002 14:48:12 +1200 (NZST)
Hi, I'm pretty new to Comedi but I'm picking it up fairly quickly, however
one problem has me a bit stumped...
I have made a few simple modifications to the cmd.c example provided with
comedilib-0.7.19. Originally it reads data from 4 channels, and I modified
it to read data from the 16 channels (subdevice 0). The first 8 channels
(0 to 7) work perfectly, however the last 8 (8 to 15) decend rapidly to
zero ('0') and remain there for the duration of the acquisition. The
channels have ac signals applied, or are grounded, so I would have
expected to see them oscillate or remain constant somewhere around
32768...
What am I missing here? Is there anything special about the top 8 channels
within Comedi or on the board itself that I need to consider? I'm using
AREF_GROUND also if that's relevant.
Thanks in advance, appreciate your time,
David
David Antliff dave_at_med-dev.co.nz
Design Engineer
Med-Dev Ltd. tel. +64-4-972-7661
Wellington, New Zealand www.med-dev.co.nz
Received on 2002-08-27Z01:48:12