F9P not receiving NTRIP from Teensy (no RTK)

Hardware
1

Hi,

I’m testing out an AIO v4.5 board build and can’t seem to get RTK working (with the Teensy).
Setup:

  • AIO v4.5
  • F9P single + BNO IMU
  • Teensy flashed with the default CANBUS FW ( here)
  • Both F9P and Teensy flashed/configured via ConfigOMatic program
  • NTRIP setup to pull from caster on my tablet and push it via Ethernet to the Teensy (Teensy light is blinking but the NoRTK light stays on the F9P)

GPS itself works, but never moves up to Float/RTK (stays at Quality: GPS 1). I tried taking the F9P out of the board and setting it up to be serial and in this mode AgIO reports it gets to Float. So this indicates to me that Teensy is either not passing the info along to the F9P or the F9P is not receiving it from the Teensy (as I believe the Teensy flashing light indicates it has at least received the NTRIP from the host/Ethernet).

Anyone have any ideas?

2

If I’m understanding what you are trying to do correctly here are a few thoughts.

A. Is the base station working? Check it with ntrip checker or similar

B. Are you connected to the caster? Possible Internet problem to you tablet

B. Are you getting good messages? Not to far away etc

C. Are they being sent to the board? Ie not serial, rtk not turned off

D. Does the board have adequate gps signal to be able to calculate a fix? Does it have a good view of the sky, good connection to its antenna, etc?

Some pictures of what you are seeing in agio and agopengps and your board would help troubleshooting.

3

I feel foolish, (literally did this 10min after I posted). On the F9P is a couple switches (one about toggling the 5V/IOREF pins, and the other about XBEE sending to port UART1/UART2). I initially ignored both of these (as I believed both to be irrelevant to my setup, Teensy gets the NTRIP and pushes to the F9P).

Well seeing as I tried changing/debugging everything else, I flipped the XBEE switch (so it changes to output to the XBEE (not present) on UART2). Powered up, GPS 1 → Float → RTK Fixed. Success!

Guess the Teensy’s UART was getting corrupted/confused with what the F9P was doing.

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