Navx Mxp no longer working

[slibert]

Originally Posted by brubakbd

We are able to read using NavXUI. All lights light up as they should, and we're using v19 of roborio firmware. We found an error outputting in driver station, it's giving "ERROR -44007 FRC: The RefNum you are trying to Get does not exist in this RefNum Registry. navX Library v2.lvlib:Z900_navX_RefNum_Get.vi" So it appears that for some reason the refnum isn't ever actually getting set in begin?

Edit:
We also just tested it over usb by plugging it into the roborio usb port. No luck with that either.

I'm not sure why you're getting this error connecting to the sensor using LabVIEW.

However, we can send another board and have you return the one you've got - if you'd like to do that, please contact support@kauailabs.com with a reference to this chiefdelphi post and we'll get you started on that. I'm a bit concerned that since the board is passing all of our usual "is it ok" tests - and thus that even after replacing the board you'll still see the issue you're seeing now accessing it from LabVIEW - but am happy to process the swap for you.

[brubakbd]

While that would be great if it would fix it, I'm not sure it would. We have two boards (1 for a practice bot), and neither are working. It must be something with software. Maybe we'll try the example code with another computer.

[Camilo86]

Did you disable your console out? You can do this through the roborio website. I remember having issues reading values from the navx due to "console out" being on (using navx through USB port)

[brubakbd]

I'll definitely check that tomorrow.

[AustinShalit]

I sent Kauailabs an email and got this response:

Once the RoboRIO firmware got updated to the 2016 firmware version, the USB connectivity to the navX-MXP stopped working. We still don't have any word on a resolution to this issue, and unfortunately I've been informed that this isn't a high priority issue from the WPI/National Instruments perspective (since the serial over USB support is not 'official').

For that reason, we're encouraging teams to use the SPI interface, or if that isn't feasible to use the I2C or TTL UART interfaces.

We do still recommend that the USB cable between the RoboRIO and the navX-MXP be left connected, because this will ensure that the navX-MXP power is maintained even if a RoboRIO stage 2 brownout occurs. More info on that is discussed in item #2 in the navX-MXP Best Practices page.

- scott

[brubakbd]

Alright, we got it working. Turns out it was something stupid we did. We were using a setref vi in begin and get ref where we wanted to use it. Turns out you should just alter begin and where you want to use it and make the output of the open vi an output of begin and an input of the vi you want to use it in.

[Alan Anderson]

Modifying the project framework (e.g. by adding an output to Begin) is usually a bad idea. Using the Refnum Set/Get functions is preferred.

The -44007 error you were getting suggests that you had spelled the name of your NavX reference differently in the two places.

[MrRoboSteve]

It's too bad about the USB not working. We used that to get the navX into a good location on the robot, where we could not fit the roboRIO.