JD 395 cx-10

Replied by Durete on topic JD 395 cx-10

Success!!!!
Tested with CX-10 Green board and JXD 395. Both works perfect, not any glitch or lost packet, simply perfect!
BTW, I tested also rates and flip mode and both works perfect.

Congrats Victzh, this is great!!!

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Replied by goebish on topic JD 395 cx-10

Cool !
I'll try to implement the Eachine 3D X4 protocol ( bit.ly/1DXAWda ) as it is a one way protocol

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Replied by Durete on topic JD 395 cx-10

Yep, I think this is a great DeviationTX moment Because last times almost all cheap RC quadcopters are using XN297.
With Victzh's fantastic work, we can implement a lot of new interesting protocols.

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Replied by goebish on topic JD 395 cx-10

Before I start working on the Eachine X4 3D I've a question for victzh Do you think the "scrambling table" (xn297_scramble[]) is fixed or depends of the values thrown into the debug registers at startup on the xn297 ?
Same question for polynomial, initial and xorout.

edit: forget this post, I tried and it works

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Replied by hexfet on topic JD 395 cx-10

Very nice work! I second the request for a blog post

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Replied by SeByDocKy on topic JD 395 cx-10

Amazing ....

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Replied by victzh on topic JD 395 cx-10

Thanks! It was a nice journey - I started it April 22 as can be seen by first file dates.

I am trying to document it, may be a list of my mistakes can be useful for somebody

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Replied by goebish on topic JD 395 cx-10

No problem, I just wanted to test, I'll wait that you finish before committing anything

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Replied by victzh on topic JD 395 cx-10

BTW, answering your question about scrambling sequence - it's fixed, it covers both address, no matter the size (from 3 to 5 bytes) and then the message. The code in the emulation layer (as you probably figured by now) handles all of this for you. You just need to call some functions instead of calling native nRF24 ones. Also, note that the main body of message is bit-reversed - it gave me extra headache decoding it

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Replied by goebish on topic JD 395 cx-10

This is what we have so far:
Seems only packet[1] and packet[2] has something to do with frequencies sequence,

TXID: E3 04 xx xx -> rf channels: 06 24 31 40 (cx-10 green pcb)
TXID: 0B 06 xx xx -> rf channels: 0E 16 33 40 (cx-10 green pcb)
TXID: FF 08 xx xx -> rf channels: 12 25 35 40 (cx-10 green pcb)
TXID: 87 10 xx xx -> rf channels: 0A 1E 2D 41 (don't remember)
TXID: 79 05 xx xx -> rf channels: 0C 1D 32 40 (JD 395)
TXID: EF 07 xx xx -> rf channels: 12 24 34 40 (cx-10 blue pcb, not exactly the same protocol but txid / channels seems to follow a similar pattern)

That's not enough for me to crack it, but a pattern is starting to emerge
rf channel 1 = (packet[1] & 0x0F) + 0x03
rf channel 2 = (packet[1] >> 4) + 0x16
rf channel 3 = (packet[2] & 0x0F) + 0x2D
rf channel 4 = (packet[2] >> 4) + 0x40

we may have to make captures on the RX side with more TXIDs on TX side.

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Replied by Durete on topic JD 395 cx-10

A new capture from my almost destroyed CX-10 green TX
I don't now if you can extract some valid info, because can't complete the bind process without the sticks

Removed capture

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Replied by goebish on topic JD 395 cx-10

Thanks, but no bind, no hopping sequence

(pas de bras, pas de chocolat )

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Replied by goebish on topic JD 395 cx-10

Thanks, added to the list (#3), it follows the pattern

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Replied by Durete on topic JD 395 cx-10

Come on guys! More captures

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