Hi
Two of my customers have trouble setting up the Pixhawk - I myself have a Pixhawk, but don't use a Futaba receiver, thereby I can't replicate the problem (I would like to find out if the problem is connected to the receiver they use, or something else).
Both use a Futaba R7008SB receiver.
Both managed to upload the Firmware to their Pixhawks - but they are not able to do the radio calibration (the Pixhawk doesn't "see" the receivers, the bars in the calibration are all grey).
They have nothing else connected to the Pixhawk, except receiver (connected to the right port / RC), buzzer, safety switch and USB cable.
The Pixhawk signals via the big LED "pre-arm check failed" (which makes sense ;)
They power the Pixhawk via USB and at the same time with a LiPo (via the Power Module).
The receiver is "found" by the remote, the LEDs are on, the setting of receiver and remote (regarding the use of the SBUS) seems to be right. They use the right port of the receiver to connect to the Pixhawk.
I am happy about any suggestions ...
Thanks a lot in advance
Felix
Replies
@Tristan: see my latest post here, thanks!
Very interesting! This sbus_decode send back wrong variables?
I think this is not only sbus.c problem because all in this file seems like good.(Logic sniffer detected s.bus frame, same speed, same data size in ms, non standard endbyte detected but not used )
In s.bus.c file minimum size frame 7ms but in 12CH mode this is only 3.3ms. Maybe ppmsum and dsm check more than 3.3ms?
This is my sbus.c file.
Just check at line 217, here are the changes.
Tristan
sbus.c
On my trial of S-Bus connection to Pixhawk.
1) Futaba R6303SB: Good
2) FrSky TFR8SB: Good
3) Futaba R3008SB: Fail (S-Bus nor S-Bus2)
4) FrSky TFR4B Good
*FrSky TFR4B is actually not a S-Bus receiver.
Compatibility List of Futaba receiver and Pixhawk
T8G 7008SB Lorez (T8G do not support FASStest)
http://www.futaba-rc.com/receivers/air.html
Futaba 18MZ and 14SG S.BUS working FASSTest mode only.
Thats why Pixhawk not working with R7008SB S.BUS/S.BUS2 Futaba FASSTest mode.
Xian; You mean something like this difference of S.Bus protocol ?
Xian,
Please - S.BUS2 is supported by Pixhawk. Here is the line that does decode S.BUS1 or S.BUS2.
https://github.com/PX4/Firmware/blob/master/src/modules/px4iofirmwa...
I can only recommend to get in touch with the APM developers (e.g. via the drones-discuss Google group) to check what the status is on a release incorporating this. You could compile the code yourself today and have S.BUS2 going.
-Lorenz
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