[Xenomai-help] analog output device with comedi/analogy

[Jonas Buchli <jonas@domain.hid>]

Dear all,

we are trying to get a National Instruments DA/AD card (NI PCIe 6259, 
see link below) working with comedi/analogy.

The drivers seem to be doing something, I can pull up the analog outputs 
to 10V (max voltage) using the example program cmd_write. So I think the 
issues I am having are stemming from not understanding and using the API 
correctly rather than driver issues (but I might be wrong).

Thus, I am trying to understand how to actually write a waveform to the 
analog output and am so far not very successful and the comedi doc seems 
a bit cryptic and scarce to me in this respect.

- Does anyone have example code how this is done?

- Is the correct procedure to issue first a command (comedi_snd_command) 
and then use the write command (comedi_sys_write) to achieve this?

- Interestingly the write command (comedy_sys_write) is not the one 
responsible for pulling up the output, it seems to already happen in the 
comedi_snd_command.

- My current approach was trying to modify the cmd_write example. Is 
this a good idea?

Any help and pointers would be greatly appreciated!

Thanks a lot and best regards
Jonas


PS:
Card being used NI PCIe 6259:
http://sine.ni.com/nips/cds/view/p/lang/en/nid/14128