Does LabVIEW support HackRF?

[bean123]

I get the same error message (USBAPI is 1.02 need 1.04).  I guess I will try building hackrf firmware from scratch and flashing to see if that fixes.  My Cmake skills are bad though

[makar853]

I think, this should help. I've just found usb_api_version defined as 1.04 in usb_descriptor.c in master branch.

[bean123]

Ha I just saw that and was going to post this

[bean123]

well i tried to compile from hackrf firmware from source from master with new USB-API on windows for the last few hrs but hit a road block and am giving up for now. 

[kuroobi]

Hi, i am using your program in LabView 2020 (64-bit). It runs well, can receive signal. but, whenever i stop the program. I get error System.NullReferenceException. I'd be grateful if you could help me. thanks

[makar853]

Hi, I've never seen such errors. Does your program close stream and all references before quitting? References to created objects should be closed in reverse order. Also have you tried examples from this thread? Do they throw same errors?

[kuroobi]

i use rx_example.vi and add spectrum.vi to plot the spectrum that HacKRF received. it has closed stream and reference. But, still throw the same error. I attached the program. thank you.

[Eldueno]

Here try this and see if you still are getting the errors.

[kuroobi]

Thank you, i really appriciate it. I still have the same issue. It seems i have problem with USB port on my hackrf. i will try your program with another hackrf. btw, what's the difference sample frequency and count? 

[makar853]

Sample frequency means how many times per second driver would copy readings from ADC to driver memory. "Count" argument of read function means how many readings you want read from driver memory. Sample frequency must be in range from 2 MHz to 20 MHz for hackrf. While "count" can be any number you want. If I get your question right.