WLtoys Q242G

Here are some SPI capture of new WLtoys protocol probably using the XN297 (to be cheched)

mon-partage.fr/f/4YGFK2qy/

Just a few differences from Q282. The combo test build has a new protocol option under cx10 for x242.

It seems to be an nRF chip since there's no special register initialization. But the value written to the rf setup register is not valid for nRF. Can you visually confirm what device is used? It looks like maybe 2Mbps data rate so that's what the test build is set for. But the actual value written in the capture is invalid according to the nRF+ datasheet, so it's a bit confusing.

The rf channels are all just offset by 2 from the Q282. Please try a few different fixed ids, mainly a small one and large one, to see if there's any difference.

The RTH and headless bits are swapped as compared to the Q282. Is it possible those captures got swapped?

hexfet wrote: Just a few differences from Q282. The combo test build has a new protocol option under cx10 for x242.

It seems to be an nRF chip since there's no special register initialization. But the value written to the rf setup register is not valid for nRF. Can you visually confirm what device is used? It looks like maybe 2Mbps data rate so that's what the test build is set for. But the actual value written in the capture is invalid according to the nRF+ datasheet, so it's a bit confusing.

The rf channels are all just offset by 2 from the Q282. Please try a few different fixed ids, mainly a small one and large one, to see if there's any difference.

The RTH and headless bits are swapped as compared to the Q282. Is it possible those captures got swapped?

Hi HexFet,

Great news... I test it in a couple of minutes.
For the receiver side at least it's a XN297L

You are probably right for the inversion of the RTH & Headless channels... Since I do not have instruction manual for it... so please swap channel as for the other protocols

Well ... unfortunatly it's not binding ....
It's strange you don't recognize the XN297 from a register point of view but this chip is here ...

I've updated the combo build to use the XN297 emulation with the Q242. Don't know if it will work. I checked that the values written to the three XN297 registers by the Q282 are different than the registers' default values. The registers have something to do with radio calibration and don't know if the default values will be compatible with nRF.

hexfet wrote: I've updated the combo build to use the XN297 emulation with the Q242. Don't know if it will work. I checked that the values written to the three XN297 registers by the Q282 are different than the registers' default values. The registers have something to do with radio calibration and don't know if the default values will be compatible with nRF.

Still not binding

Another strangeness is writing 3f to the rf setup register. Setting bits that should be 0 according to the XN297 datasheet. The code currently sets a 2Mbps data rate based on what a Beken chip will accept, but that may not be correct. Might be worth trying other data rates.

The code is pushed to the new_protocols branch in my repo if anyone would like to double-check.

No luck finding a XN297L datasheet. Nice links, goebish

Google translate is amazing. I was able to get the registration on the site goebish linked and download the datasheet. Turns out the XN297L rf setup register is not bit-compatible with the nRF. It's actually being set to a 1Mbps data rate. The combo test build is updated.

XN297L datasheet

hexfet wrote: Google translate is amazing. I was able to get the registration on the site goebish linked and download the datasheet. Turns out the XN297L rf setup register is not bit-compatible with the nRF. It's actually being set to a 1Mbps data rate. The combo test build is updated.

XN297L datasheet

Bingo it's binding now and fly smooth

EDIT... I am testing channels now

Lights: Ok
Flips: OK
Photo: Ok
Camera Ok

continuing testing

CH9 is RTH and is working
CH10 is Headless and is working
so just need to inverse CH9 & 10 and voilà

Combo build is updated to swap RTH and headless channels. I also consolidated some code with the q282 variation so hopefully still works. If there are problems I'll revert that change. Thanks for testing!

hexfet wrote: Combo build is updated to swap RTH and headless channels. I also consolidated some code with the q282 variation so hopefully still works. If there are problems I'll revert that change. Thanks for testing!

Can't see anymore the test build ... normal ?

oops...didn't notice the upload failed. It's there now.

hexfet wrote: oops...didn't notice the upload failed. It's there now.

Hummmm ... the channel are well swapped but now the quad is acting a little bit strange ... sometime the throttle is not responding for take off and it's drifting forward a bit (trasmitter calibrated and subrim to 0) something changed ?