@ZYOng and I are really trying to help you, but you refuse (so far) to attach your code, i.e. attach the .vi file that will let us actually see what you are doing. I also don't understand what it is that you want to do. What does the PWM library have to do with using the ultrasonic "distance" sensor?
Ah, maybe I get it -- you want (as we sometimes say) "to have your cake and eat it, too" (which means "You want to use the FPGA routines that are part of the myRIO Software Toolkit and also use a small user-written FPGA routine that manages the ultrasonic sensor.
This, I believe, is likely to be a little bit tricky. The myRIO Software Toolkit relies on Express VIs to generate all of the FPGA code needed by your "Target" code running on the myRIO, if you choose to use it. The alternative (which I'm currently doing) is to write all of your own FPGA code, which means that you'd need to create a "Custom FPGA" routine that included not only the code to manage the ultrasonic sensor but also the code that does the PWM functions that are currently being handled by an Express VI inside the myRIO Toolkit.
I think you need to make a choice here -- PWM or ultrasonic sensor. Of course, you could get a second myRIO to handle the second task, then devise a way to keep the two parallel Real-Time Tasks synchronized.
Have you tried the "pure ultrasonic" FPGA code? Does it work? If you posted it, and said "Could someone please help me add a PWM section that has the following properties" and clearly spell out what you want it to do, including what myRIO ports it uses, what Controls and Indicators you need, etc., and attached your VI!!!, one of us might provide some additional help. Otherwise, you'll probably be able to do this for yourself if you keep learning and using LabVIEW, particularly if you have some good mentors to help you out, but it will take a few years, I suspect ...
Bob Schor
