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protocol for JJRC H31?

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19 May 2017 06:11 #62411 by Schamane
Schamane replied the topic: protocol for JJRC H31?
Hm, did you look into the bind file? I think i did it in the right order there. But i could do a new capture this weekend if necessary.

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19 May 2017 08:49 - 19 May 2017 08:49 #62412 by goebish
goebish replied the topic: protocol for JJRC H31?
Yes, I started with the bind file, only bind packets here, no init ;)
Last Edit: 19 May 2017 08:49 by goebish.

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22 May 2017 08:28 #62485 by joeblack
joeblack replied the topic: protocol for JJRC H31?
@Schamane + goebish please continue work on protokoll for JJRC H31 - the original TX is awful bad, would be nice to fly them with my DEVOs 7e and DEVO 10.
Thanks in advance
jörg

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28 May 2017 07:34 #62620 by Cibershaman
Cibershaman replied the topic: protocol for JJRC H31?
+1! I order LT8910, i have arduino nano, radiolink a9 and same info about mod of nrf24-multipro shenatic to conect it to my radiolink! :) if i change nrf24l01 to LT8910, i wwill needed only sketch... I understand, that chip is different and it's not esy, but...

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07 Jun 2017 18:09 #62877 by Schamane
Schamane replied the topic: protocol for JJRC H31?
Hello again,
sorry for the delay (away for holiday). In this link is a capture of the initialisation process and bind and throttle at the and. I hope the capture is alright and contains all the necessary information.

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09 Jun 2017 03:49 #62901 by Schamane
Schamane replied the topic: protocol for JJRC H31?

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09 Jun 2017 08:12 - 09 Jun 2017 08:47 #62902 by goebish
goebish replied the topic: protocol for JJRC H31?
Can you take a picture of your wiring please ?
I'm asking that because the captures don't look like it's a LT8910, but as it seems the SPI bus is shared between several devices (LCD screen maybe ?) maybe you got SPI_SS (enable) wrong.

Last Edit: 09 Jun 2017 08:47 by goebish.

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09 Jun 2017 15:36 #62907 by Schamane
Schamane replied the topic: protocol for JJRC H31?
Checked it, and you're right! I was sniffing the wrong chip. I will correct that. sorry.

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09 Jun 2017 15:58 #62909 by Schamane
Schamane replied the topic: protocol for JJRC H31?
Wrong again, was just easier to solder on the second chip.
www.dropbox.com/s/wf85gchw2na8a0f/wiring%20lt8910.jpg?dl=0
This is my wiring.
The way i see it is:

GN = 2 = MISO
BN = 14 = SPI_SS
OR = 16 = CLK
RD = 1 = MOSI
YE = 15/9 = VSS (GND) wrong!!!

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09 Jun 2017 16:11 #62910 by goebish
goebish replied the topic: protocol for JJRC H31?
Sorry, but I've no idea what you're doing.
For ground you can connect it directly to battery -

Here's the pinout of the LT8910:

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09 Jun 2017 16:18 #62911 by goebish
goebish replied the topic: protocol for JJRC H31?
If the LT8910 has a too small pitch to solder directly on it you should be able to trace the 4 SPI pins to the main MCU (mosi, miso,clk,ss) then solder your probes on the bigger chip.

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09 Jun 2017 16:19 #62912 by Schamane
Schamane replied the topic: protocol for JJRC H31?
yes, that is the layout i refered to. I just used the pads that connected to the pins for easier soldering. The way i see it we need pin 1, 2, 16 and 14, right?

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09 Jun 2017 16:19 #62913 by goebish
goebish replied the topic: protocol for JJRC H31?
Right :)

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09 Jun 2017 16:31 #62914 by Schamane
Schamane replied the topic: protocol for JJRC H31?
Well, thats what i did i think. why do you think SS/Enable is wrong? MISO seems to correspond to ENABLE (active low).

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09 Jun 2017 17:01 #62915 by goebish
goebish replied the topic: protocol for JJRC H31?
Refer to my screenshot, I think SS is wrong because it is always HIGH (inactive) in the left part of the capture, where I believe the LT8910 com happens (the part on the right is not LT8910 data, I only get garbage when I pass it through a LT8910 decoder).

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09 Jun 2017 19:01 #62916 by Schamane
Schamane replied the topic: protocol for JJRC H31?
ok, i will try to make a few captures with different settings (might take a few days), maybe i had a wrong configuration. the decoded text file doesn't tell me anything. i have no clue what a good decoded file should look like. anyway, thanks a lot for your patience.

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17 Jun 2017 19:35 #63035 by Fernandez
Fernandez replied the topic: protocol for JJRC H31?
I saw BG also sell module 8910 (un amped)

www.banggood.com/LT8910-Wireless-Module-...94.html?rmmds=search

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07 Jul 2017 09:52 #63328 by Schamane
Schamane replied the topic: protocol for JJRC H31?
www.dropbox.com/s/4idsnrpczozpk3a/init%2Bbind_dump.7z?dl=0

ok, another attempt@24mhz. maybe the results of the decoder make sense this time, but it looks pretty similar to me. maybe the packets sent after the initialisation are correct?? i checked the connections again and they match the pinout of the 8910. i don't know where the mistake is or what else to do.

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07 Jul 2017 09:56 #63329 by goebish
goebish replied the topic: protocol for JJRC H31?
Sorry but I can't do anything with this csv, please post the .logicdata file.

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07 Jul 2017 10:08 #63330 by Schamane
Schamane replied the topic: protocol for JJRC H31?
maybe it has something to do with pin 13 "pkt_flag", this is what google translator tells me "The transmit / receive status flag can be set to high or low active"?

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