WLToys Q303

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26 Oct 2016 16:42 #55412 by goebish
Replied by goebish on topic WLToys Q303
Hmmm that's weird, with this option enabled your should be able to select output power.

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26 Oct 2016 16:50 #55413 by ajtank
Replied by ajtank on topic WLToys Q303
Finally able to reduce the power, still no binding.

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26 Oct 2016 16:56 #55415 by goebish
Replied by goebish on topic WLToys Q303
Ok, I've a theory why only binding seems to work but I'd need a capture from a stock transmitter that's using lower RF frequencies to confirm ...
Yours is using frequencies 2472 MHz and up and I found this could be a problem when emulating the xn297 with a nrf24l01, especially with 250kbps bitrate...
I can make a build that's using the id / frequencies of your CX35 which are in the 2410-2429MHz range, but we're still not sure they're both using the same id / freq mapping.

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26 Oct 2016 17:03 - 26 Oct 2016 17:08 #55416 by ajtank
Replied by ajtank on topic WLToys Q303
Shall I ask Seby to make a capture of his transmitter to see if the frequency is also on the higher end?
My quad has a wifi FPV and I am unsure if this is the reason higher 2.4Ghz frequencies. My CX-35 has a 5.8GHz FPV. And Seby's model has no wifi FPV.
Last edit: 26 Oct 2016 17:08 by ajtank.

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26 Oct 2016 17:05 #55417 by goebish
Replied by goebish on topic WLToys Q303
Yes, also try this build that has the same txid / channels than your CX35:
www.dropbox.com/s/t34xxg6o6ii0bk0/deviat...f3e_cx35_ID.zip?dl=1
Don't expect it to work with hte CX35 tho, they're not using the same bitrate + other small differences.

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26 Oct 2016 17:14 #55418 by ajtank
Replied by ajtank on topic WLToys Q303
Still no joy. Let me invite Seby to make a capture of his transmitter.

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26 Oct 2016 17:19 - 26 Oct 2016 17:24 #55419 by goebish
Replied by goebish on topic WLToys Q303
Maybe I'm totally wrong and there's a mistake in my code, but I checked with an emulator build + some debug code, the output is similar to what you captured from your stock TX.
github.com/goebish/deviation/blob/protoc...ocol/q303_nrf24l01.c
Last edit: 26 Oct 2016 17:24 by goebish.

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26 Oct 2016 17:28 #55420 by ajtank
Replied by ajtank on topic WLToys Q303
Let's put it aside for a while. I have dropped Seby a message and let's see if he can help with more captures.

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26 Oct 2016 17:34 #55421 by goebish
Replied by goebish on topic WLToys Q303
No problem, meanwhile I'll add the CX35 format option, it's only slightly different.

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29 Oct 2016 06:28 #55497 by ajtank
Replied by ajtank on topic WLToys Q303
I got hold of a 2nd transmitter and I have uploaded the capture for the binding. Not sure if it can provide further insights. Happy weekend.

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01 Nov 2016 22:35 #55590 by goebish
Replied by goebish on topic WLToys Q303
Here's a test build (devo 10) with the ID/channels of the 2nd TX and a few other changes:
www.dropbox.com/s/2fbzy1orsep8vxu/deviat...af3e_2nd_ID.zip?dl=1

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02 Nov 2016 00:52 #55593 by ajtank
Replied by ajtank on topic WLToys Q303
Thanks and I will try later today.
Just another thought: is it practical to add the 5th module, say XN297L? I was wondering if a separate module would be easier than emulation.

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02 Nov 2016 00:55 #55594 by goebish
Replied by goebish on topic WLToys Q303
No, I think direct support for XN297 will never happen ;)

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02 Nov 2016 00:57 - 02 Nov 2016 01:03 #55595 by goebish
Replied by goebish on topic WLToys Q303
Are you using a x-in-1 module ?
Any chance you can try with a separate nrf24l01 module ?
Last edit: 02 Nov 2016 01:03 by goebish.

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02 Nov 2016 01:24 #55596 by ajtank
Replied by ajtank on topic WLToys Q303
Indeed I am using a 4-in-1. I am also thinking of a single NRF24L01+.
I have asked the module supplier and he confirmed that the chip was a NRF24L01+ which could support 250kbps.
By the way do you find anything unclear on the XN297L datasheet?

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02 Nov 2016 01:27 - 02 Nov 2016 01:29 #55597 by goebish
Replied by goebish on topic WLToys Q303
I know some people are having issues with the 4-in-1 running the E010 protocol, which is using a XN297L at 250 kbps as well, no problem with "original" nrf24l01+.
Looks like the x-in-1 modules are using fake nrf24l01+, which doesn't support auto ack (not required for Q303 tho).

The XN297L documentation is pretty clear (better than non L version), I only have a Chinese version but google translate is helpful and it's quite similar to nrf24l01 except for a few registers ;)
Last edit: 02 Nov 2016 01:29 by goebish.

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02 Nov 2016 01:32 #55598 by ajtank
Replied by ajtank on topic WLToys Q303
XN297L has some special registers which need specific values recommended by Panchip. However I found different values regarding the 250kbps setting from different sources. I can upload them if you are interested to take a look.

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02 Nov 2016 01:34 #55599 by goebish
Replied by goebish on topic WLToys Q303
I don't think that will help, the nrf24l01 doesn't have those extra modem settings anyway.

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02 Nov 2016 01:36 #55600 by goebish
Replied by goebish on topic WLToys Q303
I can compare the Q303 XN297L settings with those of the E010, but that takes quite a bit of time and I don't think that's really useful, I'd really like that you try with another nrf24l01 module first ;)

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02 Nov 2016 02:00 #55601 by goebish
Replied by goebish on topic WLToys Q303
I've just ordered a XN297L breakout module, so if we can't get it to work I'll be able to configure it as a receiver with the same settings and check if it can receive packets from a nrf24l01.

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