NI MIO "auxiliary" channel (i.e. on-board temperarure sensor)

• From: David MacMahon <davidm_at_astro.berkeley.edu>
• Date: Tue, 18 Jul 2006 00:01:10 -0700

It looks like AREF_OTHER can be used by the NI MIO driver (i.e. 
ni_mio_common.c) to allow reading the calibration channels of these NI 
boards (at least the NI E series), but I couldn't see how to read the 
auxiliary channels (all of which are reserved except for the on-board 
temperature sensor).  Does this functionality exist in the current NI 
drivers?  If not, I'd like to add it (at least for my board type).  I'm 
open to input on how to do that.  Some possibilities are to use 
AREF_OTHER with a channel greater than 15 (e.g. use AREF_OTHER with 
chan=16+aux_chan), or somehow use CR_ALT_SOURCE to indicate that 
AREF_OTHER should use auxiliary channels rather than calibration 
channels.  The latter one sounds more robust, but CR_ALT_SOURCE seems to 
be used already as an alternative means of selecting/configuring 
channels for various board types.

I'll probably go with a CR_ALT_SOURCE "handler" for non-M-series and 
non-611x boards unless anyone has a better idea (or, of course, if this 
functionality is already somehow accessible).

Thanks,
Dave

Received on 2006-07-18Z06:01:10