WLToys Q303

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04 Oct 2016 11:18 - 09 Oct 2016 13:42 #54582 by ajtank
WLToys Q303 was created by ajtank
Q303 is similar to JJRC H28WH which supports altitude hold and 1-axis camera gimbal. It uses the XN297L transceiver. I tried binding it with Bayang, CG023, CX10, H8_3D, Hontai, MJXq protocols but did not succeed. The stock transmitter will auto bind after power up for a few seconds. SPI capture for the binding has been uploaded here . Please advise what other protocols I can try, thank you.
Last edit: 09 Oct 2016 13:42 by ajtank. Reason: supplementary info

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22 Oct 2016 16:05 #55275 by goebish
Replied by goebish on topic WLToys Q303
This is a new protocol, but your capture is not complete, please start capture before switching the transmitter on.

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22 Oct 2016 16:34 - 22 Oct 2016 16:59 #55276 by goebish
Replied by goebish on topic WLToys Q303
Thanks for the updated capture, looks like it's a xn297l at 250kbps, it shares a few similarities with xn297 CX10 protocols, but it's also quite different.
I need more captures (sticks, features, 1 capture per stick or feature please).
Last edit: 22 Oct 2016 16:59 by goebish.

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22 Oct 2016 19:18 #55280 by goebish
Replied by goebish on topic WLToys Q303
I also had a further look at your Cheerson CX35 captures, looks like it's the same protocol than the Q303 except the former has a bitrate of 1 Mbps.

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23 Oct 2016 01:33 #55293 by ajtank
Replied by ajtank on topic WLToys Q303
That is some good progress. I have uploaded more captures for Q303.

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24 Oct 2016 01:27 - 23 Dec 2016 16:50 #55322 by goebish
Replied by goebish on topic WLToys Q303
Work in progress, I only have to fill a few gaps :)
WLToys Q303
-----------

XN297L, unscrambled, 250kbps, no AA, 1 way 
packet interval: 1500 µs

bind address: CC CC CC CC CC
bind channel: 0x02

                ID ID ID ID
bind packet: AA AE 89 97 87 00 00 00 00 00 

                 ID ID ID ID
data address: 55 AE 89 97 87

ID             RF Channels
AE 89 97 87    48 4A 4C 4E
RF[i] = 0x46 + i*2 + (ID[0] & 3)

             00 01 02 03 04 05 06 07 08 09
data packet: 55 7D 1F 40 01 EE 10 10 03 40

channels: 0-1000, 10 bits, packed into 5 bytes
struct channels
{
    uint aileron:10;
    uint elevator:10;
    uint throttle:10;
    uint rudder:10;
}__attribute__((packed));

00:  0x55
01:    aileron >> 2             // 8 bits
02:   (aileron & 0x03) << 6     // 2 bits
    | (elevator >> 4)           // 6 bits
03:   (elevator & 0x0f) << 4    // 4 bits
    | (throttle >> 6)           // 4 bits
04:   (throttle & 0x3f) << 2    // 6 bits 
    | (rudder >> 8)             // 2 bits
05:    rudder & 0xff            // 8 bits
06:  0x10 // trim(s) ?
07:  0x10 // trim(s) ?
08:   0x03 = high rate (0-3)
    | 0x40 = altitude hold
    | 0x80 = RTH
09:   0x40 // always set
    | 0x20 = gimbal up
    | 0x04 = gimbal down
    | 0x08 = headless
    | 0x80 = flip
    | 0x10 = snapshot
    | 0x01 = video

Cheerson CX35
-------------
Almost same protocol, except scrambled, 1Mbps bitrate, 3000µs packet interval and different flags
ID: 24 37 46 89    RF: 14 17 1A 1D 
RF[i] = 0x14 + i*3 + (ID[0] & 3) // to be checked
Last edit: 23 Dec 2016 16:50 by goebish. Reason: complete protocol info

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24 Oct 2016 21:41 - 25 Oct 2016 01:09 #55356 by goebish
Replied by goebish on topic WLToys Q303
Here's a first test build for Devo 10, with a new Q303 protocol
www.dropbox.com/s/adanppmy4ncye8s/deviat...0.0-e324bd9.zip?dl=1

CHANNEL5, // Altitude Hold
CHANNEL6, // Flip
CHANNEL7, // Still Camera
CHANNEL8, // Video Camera
CHANNEL9, // Headless
CHANNEL10, // RTH
CHANNEL11, // Gimbal control (3 pos)

crossing fingers ...
Last edit: 25 Oct 2016 01:09 by goebish.

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25 Oct 2016 00:55 #55361 by ajtank
Replied by ajtank on topic WLToys Q303
Hope God will listen to our prayers :)

I can perform some quick tests later today but I am not able to run formal flight test for a while.

@SeByDocKy
I know you got a Q303, do you have spare time to look at this?

Are there any other Q303 owners willing to help?

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25 Oct 2016 01:11 #55362 by goebish
Replied by goebish on topic WLToys Q303
Please download again, I noticed I made a mistake and just uploaded the file again.

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25 Oct 2016 15:30 #55373 by ajtank
Replied by ajtank on topic WLToys Q303
Unfortunately it does not bind. It binds for 1 second or so (steady lights) and then it loses bind (blinking lights).
I have invited Seby via his blog to help verify, depending on how busy he is.

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25 Oct 2016 15:32 - 25 Oct 2016 15:58 #55374 by goebish
Replied by goebish on topic WLToys Q303
Ok, at least there's some reactions if it binds for 1 second :)
I'll check what could be wrong.

Maybe I made a mistake in the ID or RF channels, or maybe the quad expects that the rate flag is set to 0 just after bind.
Last edit: 25 Oct 2016 15:58 by goebish.

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25 Oct 2016 16:38 #55378 by ajtank
Replied by ajtank on topic WLToys Q303
By default the transmitter LCD always shows low rate (40%) upon power up. I have to press rate button 3 times (40>60>80>100%) to set full rate.

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26 Oct 2016 13:49 - 26 Oct 2016 13:51 #55402 by goebish
Replied by goebish on topic WLToys Q303
New test build (Devo 10):
www.dropbox.com/s/4qy8yymsslrxueh/deviat...0.0-ed9af3e.zip?dl=1

I double checked that there was no mistake with txid / address / rf channels in the previous version. This new test build sets rate to lowest position for ~2 seconds just after bind then switches to high rate. Let's check if that fixes the problem.
Last edit: 26 Oct 2016 13:51 by goebish.

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26 Oct 2016 15:35 #55404 by ajtank
Replied by ajtank on topic WLToys Q303
Same as previous build :(
Unlike other stock transmitters using throttle up and down, I have to leave Q303 transmitter idle. Just power up transmitter and it will bind after 4 to 5 seconds.

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26 Oct 2016 16:08 #55406 by goebish
Replied by goebish on topic WLToys Q303
Ok, try this one, it has 6 seconds long bind sequence:
www.dropbox.com/s/t1wvwg2yfwf3zxk/deviat...af3e_bind6s.zip?dl=1

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26 Oct 2016 16:16 #55407 by ajtank
Replied by ajtank on topic WLToys Q303
No improvement either. Perhaps you need an actual transmitter and receiver for further investigation.

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26 Oct 2016 16:18 #55408 by goebish
Replied by goebish on topic WLToys Q303
Can you try with a lower RF output power ?

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26 Oct 2016 16:26 #55409 by ajtank
Replied by ajtank on topic WLToys Q303
How to reduce the power? Unlike other configuration, I cannot change the power on Devo 10.
I tried modifying the configuration file via USB but Devo 10 always shows power = default no matter I write the setting as 150mW or 10mW.

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26 Oct 2016 16:29 #55410 by goebish
Replied by goebish on topic WLToys Q303
in hardware.ini, uncomment
has_pa-nrf24l01 = 1

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26 Oct 2016 16:37 - 26 Oct 2016 16:45 #55411 by ajtank
Replied by ajtank on topic WLToys Q303
Modified the hardware.ini but still unable to change the power :(
I can change power on Devo protocol, but not on V202 or the new Q303 protocol.
Last edit: 26 Oct 2016 16:45 by ajtank.

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