Swapping GPS ports mean you have now communication between Teensy and your Sparkfun receiver!
I had to swap the RX/TX wires on my C099 regarding to the original Panda board schematic. It’s important to have the same baudrates on each side.
Yes that is right.
Swapping RX and TX has no effect. and I’m hooked to pins 7 & 8 - RX2 - TX2.
I figure I should be configured as described in the Sketch.
// Configuration of receiver
// Position F9P
// CFG-RATE-MEAS - 100 ms -> 10 Hz
// CFG-UART1-BAUDRATE 115200
// Serial 1 In - RTCM (Correction Data from AOG)
// Serial 1 Out - NMEA GGA
// CFG-UART2-BAUDRATE 460800
// Serial 2 Out - RTCM 1074,1084,1094,1230,4072.0 (Correction data for Heading F9P, Moving Base)
// 1124 is not needed (China’s BeiDou system) - Save F9P brain power
Here is what I have
The RTCM messages are greyed out & I haven’t figured out how to select them. I’m Also not sure of how to set -
Serial 1 In - RTCM (Correction Data from AOG)
Serial 1 Out - - NMEA GGA
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Make sure the baudrate set for gps port in teensy ino is the same as uart1 baudrate on f9p. If these two settings dont match, my experience is you will be stuck wit «switching gps ports»
Check:
UART1 must be checked!
In my case must using Baudrate 460800 because of the internal need of the C099 board, also I don’t use UART2
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@wland I have set my config as you have shown above. I get connected and AGIO shows panda connected but I still have no GPS. I have swapped wires on pins on both UART1 and UART2 (on the f9) - no change. I also did continuity test from pins on teensy to pins on GPS to rule out bad wires.
@PotatoFarmer Could you share your config file? You have your Sparkfun f9 working so maybe it would make mine work also.
Just for my understanding, you tried for sure:
Teensy Pin 7 RX2 to F9P RX/MOSI
Teensy Pin 8 TX2 to F9P TX/MISO
and cross both wires
Teensy Pin 7 RX2 to F9P TX/MISO
Teensy Pin 8 TX2 to F9P RX/MOSI
with setting the baudrate 115200 for UART1 on Teensy and F9P side
Note: Be sure the DSEL jumper on the rear of the board is open.
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So you get the $PANDA message received in AgIO but just unpopulated?
Here is my sparkfun 1.32 config file, but I do not use Glonass, and uart1 I have set to 921800 because its used in an all UDP setup with a ttl adapter.
AgOpenGps Sparkfun UDP PANDA v1.txt (25.0 KB)
the config for these is a bit of a beast, it needs the port, message type and message to be enabled one by one. This is the gen9 configuration view I find it easier to use.
I am so glad you raised the question. In all my switching around I had put the wires on the X2 pins and not the MOSI. I now have Panda sentences with serial monitor. Orange light on teensy is flashing, that’s a first for that!!!
I have a green light on the antenna in AGIO, which I have not had until now and I have a GPS signal and tilt in AOG. 
THANK YOU ALL!!!
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I was updating from 1.13 to 1.32, teensy wasn’t seeing it, I made the configuration as the ray_jorgensen suggested. it works perfectly now. The only problem I don’t understand is that I did the speed this way while updating, I wasn’t sure if I did it right.
The speed of the update process itself depends on this.
I updated from 1.13 to 1.32. everything was working. I updated from teeny v5_6 to v5_5. as the most recent code published. agopen not seeing GPS after teensy update. Where could I have made a mistake?
I set uart1 115.200 uart2 460800 on right and left.
Position GGA VTG 12C aktive
If you’re connected to u center, try disconnecting and then retry AOG.
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Set Uart1 as 460,800 and Uart2 as 115,200.
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I set it as you said. teensy yellow light turned off. Teensy doesn’t see it.
I turned it on and off many times and checked the ip addresses. nothing changed.
If you’re sure you saved the Config files and baudrate changes, try reloading the Teensy firmware, I’ve had numerous occasions I’ve had to do it more than once for it to work correctly.
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I updated to teensy V5.6 problem solved. Thank you for your help
1.7.1 does not see agopen speed. where could i go wrong
I installed f9p and bno085 teensy version 5.5. Everything is very good, but I can’t get the speed in 5.7.1.
Update the configuration and firmware of u-blox.
VTG needs to be enabled.
I updated to 1.32. VTG is active. rtk connecting