- Posts: 1876
Serial out for LRS boxes
- hexfet
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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.
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- xfapv
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- Posts: 23
The signal is indeed from the CRSF protocol of the lateest build 7cb0da7. If I switch to another protocol it is zero.
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- xfapv
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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")
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- hexfet
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- Posts: 1876
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.
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- xfapv
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- Fernandez
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- hexfet
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- Posts: 1876
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- Fernandez
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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.
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- hexfet
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- Posts: 1876
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?
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- Fernandez
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- Posts: 983
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)
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- hexfet
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- Posts: 1876
Forgot to mention the ground also must be connected from the tx to the fc.
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- hexfet
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- Posts: 1876
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- brycej
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- Posts: 28
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?
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- brycej
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- Posts: 28
I don't yet see the RC changing in betaflight yet. I did have it bound and working previously on a Taranis.
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- hexfet
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- Posts: 1876
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?
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- brycej
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- Posts: 28
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.
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- hexfet
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- Posts: 1876
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.
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- brycej
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- Posts: 28
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
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- reednoel4u
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- Posts: 20
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.
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- hexfet
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- Posts: 1876
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