I can implement using the NOR-6221 SPI? When I try to generate using ctr0 make an error indicating 'Sample clock' is not a supported option.

I'm trying to use a NOR-USB-6221 to implement SPI in a C++ application.  When I try to configure a digital output task that uses ctr0 as the clock, I get an error stating that 'Sample clock' is not supported and use instead "on demand".  I would be able to use the NOR-6221 and if so how to do this?  Thank you.

Hi IntAndTest,

Maybe silly question: are you sure that you have a USB-6221 and not a USB-6212? The USB-6221 supports clocked DIO, but the USB-6212 is not working.

A problem with your code: when you specify a terminal DAQmx name, it must be is compared to the device (such as 'Ctr0InternalOutput', "AI/SampleClock" or "PFI0") or contains a slash before the device name (like "/ Dev1/Ctr0InternalOutput", "/ Dev1/AI/SampleClock ', or ' Dev1 / / PFI0"). This does not apply to the names of physical channel (like ' Dev1/port0' or "Dev1/ctr0").

The error is returned from code that you have not displayed? Your says error message DAQmxCreateDIChan failed, but the code you posted does not call this function. In addition, I don't see a call to DAQmxStartTask or DAQmxWriteDigitalU8, U16, U32, whatever.

Also, what NOR-DAQmx version are you using?

Brad

Tags: NI Hardware

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