Joined Nov 2015
Cleanflight Flip32 / Naze32 SBUS & GPS
I have a Flip32 10dof controller, I have a Radiolink R9D Receiver, have build a SBus Inverter cable and have the receiver connected to the Controller and all working using Cleanflight.
Does anyone know how I connect a GPS as from what I have read the GPS should plug in to Chanel 3 & 4 however the SBus connects into channel 4.
Is there a way to remap either the SBus or GPS to use different Chanel?
I have searched and searched but dont seem to be able to find out how to this.
Joined Mar 2005
I'm just finishing an 'all up' build with GPS, telemetry for an OSD *and* back to the TX and initially an SBUS RX. I modified an FrSky X4RSB. Did a lovely job - brought tears to the eyes.
I ran in to the same problem as you - SBUS needs a hardware (UART) port for speed, and UART 2 (for which the RX pin is pin 4 - these are commonly mislabelled on diagrams found on the Internet!) is usually used. You CAN use UART 1, which is the set of pins near the USB connection, but you can only use UART 1 OR USB at any given time - NOT both! - so you can't look at your receiver activity on Cleanflight.
You CAN connect your GPS to a 'softserial' port - but up to a maximum of 9600bps. I was unable to find out whether this was sufficient bandwidth, so in the end, I took the decision to revert to PPM (connected to pin 1), freeing up UART 2 for the GPS running at 57600bps.
I also used UART 1 for the OSD telemetry - picking up GPS data and info from the FC. I can unplug the OSD when I want to use the USB port.
Finally I have 1 connection to the TX pin of softserial 2, sending telemetry info back to the TX via an FrSky vario, which happens to do a convenient job of translating the data into S.port (not SBUS! Confusing!) format.
The pins on the Flip 32 run:
3 UART 2 TX
4 UART 2 RX : Note these 2 don't run
5 Softserial 1 RX : in logical order!
6 Softserial 1 TX
7 Softserial 2 RX
8 Softserial 2 TX
So, summary - I decided that the need for super fast SBUS was less than the need for fast GPS data. I might be wrong. PPM worked fine on my 250 class quad, which was a lot nippier than this 450, and I never noticed any latency.
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