Synchronization of PCI, I / AO: clock edges and expected behavior
I'm writing the data with an analog output on a USB-6216 channel and its reading is back with an analog input. I do this to check my control signal, and I use the value of collating a way definitive about what was the control signal, I read the other analog inputs that depend on this control signal.
I use the approach suggested in this example:
http://zone.NI.com/DevZone/CDA/EPD/p/ID/2352
More precisely:
(1) create the task of AI (let's say it's 10 kHz)
(2) set up the calendar of the sample for the task of the AI help ' "as the parameter"source"to DAQmxCfgSampClkTiming (i.e., clock edge), using DAQmx_Val_Rising as the active side
(3) create the task of the ao
(4) set the example for the task of ao using 'AI/SampleClock"as the"source"parameter and the sampling frequency of 10 kHz (same HERE), using DAQmx_Val_Rising as the active side. The sampling frequency, according to another thread I posted, is not particularly explicit here, since it will be triggered at the AI/SampleClock rate still.
(5) to start the task of the ao (which isn't really begin again because it expects the AI sample clock to run)
(6) to begin the task of AI (which actually starts two tasks)
I change the value of output quickly, and I care about timing of level sample. Have I and ao triggered on exactly the same clock is a little confusing here... This means that the task of AI will read * exactly * as ao task is written, as it is unclear whether she will read the samples 'previous' or 'common '? Can I use the clock edges, opposed to this kind of task if I want a deterministic behavior?
Thank you!
-Dan
You can call DAQmxSetDelayFromSampClkDelay (Department of redundancy Department anyone?) to configure your analog input task to introduce a delay between the edge of sample clock and the clock to convert (which starts the analog-to-digital conversion). This will allow time for the output to be resolved before it is measured by the analog input analog.
Best regards
Tags: NI Hardware
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