Recently I was trying to turn on the switchable port on the PDH, and I plugged into the USB port, and the REV hardware client informed me that there was a firmware update for the PDH. I had it do the update, but then it said something about being stuck in the bootloader, and now I can no longer see the PDH via the REV software directly via USB, or on the CAN bus, when connected to a Spark Max via USB.
Is there any way to put the PDH into a “safe mode” or reset it somehow to get it to boot properly?
We had a similar issue a few weeks back and found that there were many ways in which you can fix this issue. First being that you would have to power cycle the robot, then test. Second would be changing the USB cord, or changing the rotation of the cord (There isn’t a specific way in which you are supposed to plug it in, but this has helped us). Third would be restarting your laptop and/or using a new laptop. Lastly would be reading the docs and making sure you have the newest hardware client downloaded as well as the new image to put onto the PDH. If you happen to plug into a SparkMax, you should also be able to see the PDH, if not then there may be a issue with your CAN Bus.