Problems with a major acquisition using ConfigureDataPositionDelay time

I do not think that my cards are accept the entrance of the 'ConfigureDataPositionDelay' function as expected when I created a loop of "sweep" delayed.  (I'm trying to find the optimal placement of strobe).

I have a PXI system with PXI-6552 3 cards. (only the first two cards capture data HAD)

My waveform is running at 40 MHz.

I'm not use HWC because I want the option to let the drivers on (conduct 0V) so I can use their impedance of 50 ohms as line terminations.

I use HSDIO driver version v1.6.  There are problems of compatibility with some legacy code NIDAQ-Tradition and NI488.2 in my test environment that yields 'Visual C++ Run Time error (R6030 - uninitialized CRT)' if I try to use v1.7

Here is an excerpt of the pseudo code for my scan:

Loop strobe_placement from 0.0 to 0.9 in 0.1 steps:

  niHSDIO_ConfigureDataPositionDelay(card1acq, pin_list, strobe_placement)
  niHSDIO_ConfigureDataPositionDelay(card2acq, pin_list, strobe_placement)
  niHSDIO_Initiate(card1acq)
  niHSDIO_Initiate(card2acq)
  niTClk_Initiate(3, gen_array)

  niHSDIO_WaitUntilDone(card1acq, 2000)

  niHSDIO_FetchMultiRecordU32(card1acq, data_rec_len, 1000, 1, 1, samp_data, wfm_info)
  niHSDIO_FetchMultiRecordU32(card2acq, data_rec_len, 1000, 1, 1, samp_data, wfm_info)

Now, I know that the 'ConfigureDataPositionDelay' function works very well in my initialization code of the system when my application loads first upward.  This initialization code defines MANY features on all my cards and uses MANY different driver calls.  Maybe I need to call another function of driver AFTER the call of 'ConfigureDataPositionDelay' to force the material to make the change?

Oops.  It's always the simple things.

I had ConfigureDataPosition the value NIHSDIO_VAL_SAMPLE_CLOCK_RISING_EDGE during my scan

instead of NIHSDIO_VAL_DELAY_FROM_SAMPLE_CLOCK_RISING_EDGE as it should be.

Now my scanning works very well.

Tags: NI Hardware

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