Serial out for LRS boxes

Thanks, look forward to more details. Pics or videos can be helpful.

Have you tried the latest test build ( 7cb0da7 ) with the Crossfire module? The packet header byte is changed which should make some change in the behavior.

I wired it up as shown in the images. Oscilloscope x-axis: 30 microseconds/cm
The signal is indeed from the CRSF protocol of the lateest build 7cb0da7. If I switch to another protocol it is zero.

I also tested various connections between the devo and the crossfire module. The combinations are:

Devo12S connected to crossfire module
TX (pin header) to pin 3 (trainer tip)
TX (pin header) to pin 5 (CRSF input as shown in "Futaba custom cable" by TBS)
tip (trainer port) to pin 3 (trainer tip)
tip (trainer port) to pin 5 (CRSF input as shown in "Futaba custom cable" by TBS)

in total 4 possible wirings. Long story short: none works ("RC input: no signal")

That does look a mess. The same trace appearing at different vertical locations typically indicates a poor ground connection. What signal is there looks to be about 13KHz which doesn't correspond to anything in CRSF. From these pics it seems the problem is there's no CRSF signal at all.

Which input on the scope is being used? The coupling should be DC but looks like channel A is set for AC. The CRSF signal is just a couple volts so a good scale would be 0.5. This can be affected by the probe being used so check if it has a multiplier. If you connect the probe input to the input ground there should be a flat line across the screen. Adjust its position to near the bottom.

The signal should look something like the attached screenshots though these are from an oscope a generation newer The output is from t8sg plus trainer port tx pin referenced to trainer port ground. One shows the 4ms interval between data packets. The other shows the 2.5us bit time within a packet. It might be easier to scope the SBUS output which is a quarter the speed of CRSF.

The signal won't be on the trainer port on a 12. Check the RX pin header just in case the labels are swapped.

thanks for your reply. Now I know what to search for. I will try to get access to a better osci.

@Hexfet sorry for delays wanted totest before, anyway I have wired up 3.5mm jack to my U7E and connected to an Ominbus F4, the Rx3 input, wanted to try your Sbus out from deviation, but I can't find the test build it is not available.

The SBUS protocol is in the protocol_crsf test build.

Hi Hexfet, sad to tell but it doesn't seem towork.
Do you address the right output pin?
I have loaded devo-7e Ultimate and connected the ppm output pin and gnd, 3.5mm ext port to Rx3 pin of Omnibus F4. (not inverted)


I tried to set in deviation 1-8-16 channel, but did not see the bars moving in betaflight configurator.

It's the same output pin that's used for PPM. If you have a way to test PPM output with the same cable that would verify the hardware connection.

Do you have the UART5 mod on your U7E? If so please try with it disabled in the ini file.

Do you have a way to check the SBUS output without the FC? An FTDI device or logic analyzer?

Wow Thanks Hexfet, Sbus works!! You can add to the nightlys.

I did wire up the middle pin,stereo 3.5mm accidentally...
I have also UART5, soldered up and enabled in ini, it is for VOICE MP3, but no issue.

I only tested setup 8ch and all channels work perfectly. With channel at 100% scale, 1000 midpoint at 0 endpoint at 2000.
After selecting SBUS, you must press re-init, to enable.
But at power on S-Bus out comes up perfectly.

So this should work for Qzek LRS, instead of PPM or ( PXX ).

(If anyone want to test, just connect the Sbus output from the PPM pin at the back of DEVO and connect to Rx pin uart at flight controller (no inversion, so not take Sbus input pin at flight controller)

Good to hear you got it working. (It's usually the cable

Forgot to mention the ground also must be connected from the tx to the fc.

The CRSF (Crossfire) and SBUS protocols will be included in the next nightly build.

Hi Hexfet,
I went to try it out and it doesn't seem to be working for me.

Wired the top and bottom JR port pins together, and selected the csfr protocol. I scoped the top pin and don't seem to have any data go across. Anything else I need to do for t8sg plus?

Not sure exactly what I did, but I can see the signal now. Might have changed it from 8 channels to 16? Or started a new model.

I don't yet see the RC changing in betaflight yet. I did have it bound and working previously on a Taranis.

Thanks for testing!

After choosing CRSF protocol the Re-Init needs to be clicked, or a power cycle would do the same thing. I put the latest nightly on my t8sg plus and the CRSF output looks good for timing and voltages.

You have the Micro TX module? Looks like it does not have the external display. Can you connect to it through the USB port while it's active, and see an "RC Input" status is available similar to the external display on the full module?

Does the Micro TX work as expected if the protocol is set to PPM?

No problem! Just got the crossfire so I am new at setting it up. Yes I got the micro TX.

I connected to the USB and opened the TBS agent but I don't see any RC input options.

Tried PPM and that works well. So at least the TX to RX link seems to be working.

I got a scope and other test equipment if you needed me to grab any data.

From your pic and testing on my t8sg plus it looks like the signal timing is correct. Are there any shorter pulses between the 650us duration pulses?

If you have a Taranis it would be great to get some captures of the data sent by the Taranis to the Micro TX when it's powered on. This would be on the top pin of the JR bay. Can the Rigol decode a serial bit stream? If not a logic analyzer or FTDI would work.

Hi Hexfet,

I captured a couple 10 sec logic analyzer traces here: drive.google.com/drive/folders/1PfZe9CNt...5MnNi71j?usp=sharing

Should be able to open those in saleae logic and view them. Or else there is a decoded serial csv for one as well. I could grab a Rigol capture as well, I do have serial decoding on there.

Bryce

Dear all,
I using QCZEK LRS with ppm Devo10 out ppm, but so delay ( please see video attached : drive.google.com/open?id=1d66Rs4BLK-y7krPFQCy2w8S8eV6td9nJ )
I want using sbus, but don't know wiring Devo10 pin out sbus wiring to aux of Lora.
Please help me with many thanks.
Best regards
Reed.

The SBUS output is on the trainer port connector. The outer ring is ground and tip is the SBUS signal. It is not inverted.