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ArduPilot / ardupilot

ArduPlane, ArduCopter, ArduRover, ArduSub source
http://ardupilot.org/
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FrSky telemetry missing on Linux #16128

Open arikrupnik opened 3 years ago

arikrupnik commented 3 years ago

Bug report

Issue details

No FrSky telemetry appears to emit from the serial port on Beaglebone Blue.

The serial port appears to work correctly. Queries from the FrSky RX arrive, but AP responds only to messages with ID 0x00. bbbl-yaapu2

Zoom in on AP's response. bbbl-yaapu3

For reference, here's a trace from an F405 board where telemetry s working. bbbl-yaapu4

I’m using a 232 cable from Amazon. The cable is good (tested on F405). I have it plugged into UART01. UART01 and its corresponding port assignment to SERIAL2 (-D /dev/ttyO1) work. If I connect a GPS to UART01 and set SERIAL2_PROTOCOL,5, I get GPS data. When I’m trying to get yaapu telemetry on this port, I set SERIAL2_PROTOCOL to 10.

I posted this question here originally: https://discuss.ardupilot.org/t/frsky-telemetry-yaapu-working-on-f405-failing-on-bb-blue/65495

Version Tested with plane 4.0.7, 4.0.6, built locally on the BBB.

Platform [X] All [ ] AntennaTracker [ ] Copter [ ] Plane [ ] Rover [ ] Submarine

Airframe type all

Hardware type Linux on Beaglebone Blue

arikrupnik commented 3 years ago

According to @yaapu , this may be a limitation of the Linux serial port timing: https://discuss.ardupilot.org/t/an-open-source-frsky-telemetry-script-for-the-horus-x10-x12-and-taranis-x9d-x9e-and-qx7-radios/26443/1351 If this is the case, I feel we should document this limitation. I'm happy to make a PR against the Wiki. I'm not sure what page this information should be on. It feels like something that's most relevant to Linux users, but I don't know that there is a page for Linux issues as such.

yaapu commented 3 years ago

@Hwurzburg any hints?