Detection of changes in PCI-6509 missing first data entry

Hello

I have two 6509 cards in separate computers, connected to each other. I use six lines, with one channel for each line, to send signals between the two boxes.

I used the driver NOR-DAQmx 8.0.2 on SUSE Linux, coded in C.

Starting by examples of digital I/o that I did a card pass in four lines and the other card received the signal, using the detection of change on the falling edge only, with the lines reversed.

To send a signal it took the value 1 on this line, using digital lines of writing and then set it to 0 using the same function.

If I send 4 signals, apartment of 100 ms, 1 on each line. The recipient will detect all four edges of falls, but the function of reading digital lines (in the recall of events highlights registed) returns zero for the first detection. I read only one sample of each line. Once that happens all seems fine.

I read that more than a sample for the first digital reading for function call?

What I have to do my signal longer, for the moment it comes to 150us? I can do this with an expectation in the code. I can afford it to streatch for about 1 ms, but it's always with this kind of treatment.

Is there some call the initialization to get the driver to initialize the internal memory or something? (Maybe it's my wrt slow code, but I don't see how, there is almost nothing.)

Thank you

I think we arrived at the conclusion that this card cannot detect as close as 450ns interruptions. The API does not quickly that detect enough them between the interruption and the call to read data lines.

It seems that we should have brought a card counting rather than a map of interruption.

Tags: NI Hardware

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