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Date: Fri, 07 Aug 2015 09:00:26 -0400
From: Jorge Ramirez Ortiz <jro@xenomai.org>
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Subject: Re: [Xenomai] analogy calibration issue(s)
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To: "Yogi A. Patel" <yapatel@gatech.edu>
Cc: "xenomai@xenomai.org" <xenomai@xenomai.org>

On 08/07/2015 08:43 AM, Yogi A. Patel wrote:
>>> I did - and it turns out the error was due to this line:
>>> >>
>>> >> __debug("Calibrating AI: %s \n", cal_info[i]);
>>> >>
>>> >> changing this to:
>>> >>
>>> >> __debug("Calibrating AI: %s \n", cal_info[i].message);
>>> >
>>> > I already sent you a patch for this
>>>
>>> This patch needs to be applied to 3.0-rc6.
>>>
>>> > can you send the calibration file please?
>>>
>>> attached.
>>>
>>>
>>>
>>>
>>> I spent some more time digging at the code. The insn_read process hangs at 
>>> a4l_read_calibration_file because when the for loop (line 214) runs the second 
>>> time, it does not find the string “elements”, and thus sets nb_elements to 65535 
>>> - causing it to run forever.

you didnt get any errors while calibrating?

>>>
>>> This is because it is looking for the elements string under “analog_output” in 
>>> the calibration file, however there is no such section in the calibration file.

yes, read_int should be checking for errors.

>>>
>>> The calibration file also doesn’t include all the analog inputs (it only shows 
>>> 7, whereas the board has 16 AIs. So does the PCI 6220). What am I missing/not 
>>> understanding?

yes I was looking into this as well; the soft calibration feature replicates the
Comedi version behaviour so this is very likely a bug.