18 channels for DSM2 / DSMX ?

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26 Oct 2013 15:18 - 26 Oct 2013 15:19 #15005 by vlad_vy
Replied by vlad_vy on topic 14 channels for DSM2 / DSMX ?
OK, it is possible that transmitted only active xchannels. But, if is active only one xchannel, what is transmitted with second packet of the frame?
Last edit: 26 Oct 2013 15:19 by vlad_vy.

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26 Oct 2013 15:24 - 26 Oct 2013 15:38 #15006 by Cesco
Replied by Cesco on topic 14 channels for DSM2 / DSMX ?
I have no idea.

We have to find a guy who actually owns a dx18 and receiver to find out. Costs $750 here.

One thing is i could not make deviationtx work in dsm2 2048 mode. Only dsm2 1024 mode. Dsmx does 2048 mode. There should be an option to bind in dsm2 / 2048 too. How does the dx18 handle this?

Actual xchannel data dump:
xchannel value
0 86
7 426
1 256
4 85
2 256
5 256
3 256
7 426
0 86
4 85
1 256
5 256
2 256
7 426
3 256
4 85
0 86
5 256
1 256
7 426
2 256
4 85
3 256
5 256
Last edit: 26 Oct 2013 15:38 by Cesco.

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26 Oct 2013 15:34 - 26 Oct 2013 15:37 #15007 by vlad_vy
Replied by vlad_vy on topic 14 channels for DSM2 / DSMX ?
It is how it implemented by PB, only DSM2 10bit and DSMX 11 bit. It works at many cases. For full support Tx need read and interpret Rx capability responce.
Last edit: 26 Oct 2013 15:37 by vlad_vy.

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26 Oct 2013 16:12 #15009 by victzh
Replied by victzh on topic 14 channels for DSM2 / DSMX ?
Do you mean that DSMX is bi-directional during binding (or start of the session) even if telemetry is not used?

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26 Oct 2013 16:33 - 26 Oct 2013 16:34 #15013 by vlad_vy
Replied by vlad_vy on topic 14 channels for DSM2 / DSMX ?
"Here's a little more detail about the format of the transmitted bind packets in DSM2/X

Packet sent from TX

Bytes 1 - 4 GUID of the radio
Bytes 5 - 8 = copy of bytes 1 - 4
Bytes 9 and 10 = checksum of bytes 1-8 (add bytes 1 thru 8 together and then add 0x170.
Byte 11 always equals 1 in every Spektrum radio I've seen - don't know its function
Byte 12 = number of transmitter channels
Byte 13 = capabilities of the transmitter

DSM2 transmitter = 0x01 or 0x02 (I think it is the number of packet pairs needed for a complete frame 7CH TX = 0x01, 8+ CH = 0x02)
High speed DSM2 = 0x11 or 0x12
DSMX 7 channel TX = 0xA2 (DSMX and 11 bit resolution)
DSMX 8+ channel TX that supports high speed = 0xB2

Byte 14 always 0x00
Bytes 15 & 16 = another checksum created by adding bytes 9 - 14 together with the checksum at bytes 9 & 10

================================================================

The receivers always respond with a 10 byte packet that has the format:

Bytes 1 - 4 = GUID of the TX
Bytes 5 = always 1
Byte 6 number of channels of the receiver (can't always be relied on; my AR8000 always says 7)
Byte 7 = capabilities of the receiver in the same format as Byte 13 above
Byte 8 = always zero
Bytes 9 & 10 = checksum"
Last edit: 26 Oct 2013 16:34 by vlad_vy.

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26 Oct 2013 19:34 - 26 Oct 2013 20:11 #15019 by Cesco
Replied by Cesco on topic 14 channels for DSM2 / DSMX ?
Vlad, if you have a version, im eager to give it a try. Devo10 or Devo12
Test-receiver on multiwii basis is ready.

Unluckily i cant compile anmore myself, something messed up.

Edit:

There is a messup with the D bit. I did think i have seen it, but testing i cant see it, always zero. So the msb of the x-channel number depends if its the first packet or not. If channel 0 is in the same packet add 4, if channel 1 is in the same packet add 0.
Last edit: 26 Oct 2013 20:11 by Cesco.

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27 Oct 2013 07:22 - 27 Oct 2013 07:32 #15026 by vlad_vy
Replied by vlad_vy on topic 18 channels for DSM2 / DSMX ?
Cesco, I don't understand about xchannel number.

The D bit is always 0. It have sense, since it have to be 0 for 1st data packet, 1 for 1st channel in 2nd data packet.
If it is the first packet of frame, 0-3 xchannel number equal 0-3 xchannel number.
If it is the second packet of frame, 0-3 xchannel number equal 4-7 xchannel number (+4).

Is it right?
Last edit: 27 Oct 2013 07:32 by vlad_vy.

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27 Oct 2013 08:31 - 27 Oct 2013 08:42 #15028 by Cesco
Replied by Cesco on topic 18 channels for DSM2 / DSMX ?
Ty for the D bit explanation, didnt know that.

So i did look at D bit in first channel to determine if 0..3 or 4..7.
I confirm if channel 1 D bit is set its 4..7, else 0..3.

My decoder: bcas.tv/paste/results/1kqYIx42.html
Last edit: 27 Oct 2013 08:42 by Cesco.

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27 Oct 2013 08:53 - 27 Oct 2013 09:10 #15029 by vlad_vy
Replied by vlad_vy on topic 18 channels for DSM2 / DSMX ?

Cesco wrote: If channel 0 is in the same packet add 4, if channel 1 is in the same packet add 0.


Channel transfer structure:
packet 1 -> 1 5 2 4 6 10 12
packet 2 -> 0 7 3 8 9 11 12

vlad_vy wrote: The D bit is always 0. It have sense, since it have to be 0 for 1st data packet, 1 for 1st channel in 2nd data packet.
If it is the first packet of frame, 0-3 xchannel number equal 0-3 xchannel number.
If it is the second packet of frame, 0-3 xchannel number equal 4-7 xchannel number (+4).


I think it's right.

Order of channels in packets may be variable. I don't check it, but I think it may depends from Tx model type: ACRO, HELI, SAIL. This way Tx group channels for main controls, for HELI ch2, ch3, and ch6 placed in the same packet for minimal delays.
Last edit: 27 Oct 2013 09:10 by vlad_vy.

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27 Oct 2013 11:23 #15035 by Cesco
Replied by Cesco on topic 18 channels for DSM2 / DSMX ?
Seems my receiver is working with DX18 on x-channels.

i did post actual (baseflight) source here:
www.rcgroups.com/forums/showthread.php?t...page=17#post26478241

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27 Oct 2013 17:04 - 28 Oct 2013 04:48 #15046 by vlad_vy
Replied by vlad_vy on topic 18 channels for DSM2 / DSMX ?
Cesco, I'm not sure it will work. I can't test X-Plus by any way. It's for testing purposes only. DSM2 2048 22ms for >7 channels (DSM2 <8 channels will not work). DSMX 2048 22ms. Total 20 output channels, 12 normal channels + 8 X-Plus channels. Unused X-Plus channels have 256 value.

Firmware for Devo12, based on last v3.1.0-beta-03 rbe2012 build.

DELETED
Last edit: 28 Oct 2013 04:48 by vlad_vy.

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27 Oct 2013 18:55 - 27 Oct 2013 18:56 #15053 by Cesco
Replied by Cesco on topic 18 channels for DSM2 / DSMX ?
Some good news Vlad. Tested DSMX 20 chan.

lower 4 chan
dbg1 ok
dbg3 ok
upper 4 chan
dbg2 ok
dbg4 ok

numbering xchannels 1 to 8 means
xchan 1,3,6,8 work
xchan 2,4,5,7 dont

GREAT WORK !

No idea whats up with the non working channels.
Be aware my soft could be easily be wrong.
Last edit: 27 Oct 2013 18:56 by Cesco.

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28 Oct 2013 03:35 - 28 Oct 2013 03:36 #15063 by vlad_vy
Replied by vlad_vy on topic 18 channels for DSM2 / DSMX ?
It can be that my code have errors. It possible since you tested it with DX18 and all works.

I will check my code again. Also, we need to know what is transmitted in case unused X-Plus channel. For example, if enabled X-Plus 1 only, what is transmitted with the second packet. Possible it can be 0xFFFF.
Last edit: 28 Oct 2013 03:36 by vlad_vy.

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28 Oct 2013 04:46 - 06 Nov 2013 15:22 #15065 by vlad_vy
Replied by vlad_vy on topic 18 channels for DSM2 / DSMX ?
Possible I catch my error. Since you can test it with DSMX protocol, I implemented X-Plus channels parsing for DSMX protocol only and do not mess DSM2 protocol.

Total 20 output channels, 12 normal channels + 8 X-Plus channels. Unused X-Plus channels have 256 value.

Firmware for Devo12, based on last v3.1.0-beta-04 rbe2012 build

DELETED
Last edit: 06 Nov 2013 15:22 by vlad_vy.

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28 Oct 2013 09:31 - 28 Oct 2013 10:04 #15069 by Cesco
Replied by Cesco on topic 18 channels for DSM2 / DSMX ?
I have tested DSMX OrangeRX R110X sat on Acro Naze 32 FC
X-channels 1,2,3,4,5,6,7,8

:) They all work now ! :)


The unused channels data will be difficult since i dont have a DX18. I know an american guy over IRC who did the testing, and i will have to convince him to do it.
From reading the x-channel spec it seems if you only define 2 or 4 or 6 x-channels, only those are sent (x.-channel latency from 22ms to 88ms) but if you define 1,3,5,or 7 channels i dont know.

Well TY, i got a 20channel Devo12S now :)
Last edit: 28 Oct 2013 10:04 by Cesco.

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28 Oct 2013 10:25 - 28 Oct 2013 10:50 #15071 by vlad_vy
Replied by vlad_vy on topic 18 channels for DSM2 / DSMX ?
Now I send x-channels with next sequence (not optimal, but easy to undestand):
ch13 = x1 (22ms)
ch14 = x2 (44ms)
ch15 = x3 (66ms)
ch16 = x4 (88ms)
ch17 = x5 (88ms)
ch18 = x6 (88ms)
ch19 = x7 (88ms)
ch20 = x8 (88ms)

I can reorder x-channels for better arrangement in packets:
ch13 = x1 (22ms)
ch14 = x5 (22ms)
ch15 = x2 (44ms)
ch16 = x6 (44ms)
ch17 = x3 (66ms)
ch18 = x7 (66ms)
ch19 = x4 (88ms)
ch20 = x8 (88ms)

Delays listed in order adding number of channels, 13 or 14 or 15 ...
Last edit: 28 Oct 2013 10:50 by vlad_vy.

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28 Oct 2013 12:25 #15074 by Cesco
Replied by Cesco on topic 18 channels for DSM2 / DSMX ?
I would send the channels always as fast as possible.

if 14 channels defined ( 2 x-chan ) every 22ms
if 16 channels defined ( 4 x-chan ) every 44ms
if 18 channels defined ( 6 x-chan ) every 66ms
if 20 channels defined ( 8 x-chan ) every 88ms

spektrum states those x-channels are for gear / lights / special functions, so latency or the 512 resolution should not matter anyway.

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28 Oct 2013 13:10 - 03 Nov 2013 06:03 #15077 by vlad_vy
Replied by vlad_vy on topic 18 channels for DSM2 / DSMX ?
Cesco, can you test next firmware version, with disabled (probably) unused X-Plus channels?

If you will add number of channels, 13 or 14 or 15 ..., you have to get 1 or 2 or 3 ... x-channels. I hope it will be like this.


DELETED
Last edit: 03 Nov 2013 06:03 by vlad_vy.

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29 Oct 2013 09:27 - 29 Oct 2013 09:38 #15114 by Cesco
Replied by Cesco on topic 18 channels for DSM2 / DSMX ?
Tested from 12 to 20 channels and working like expected :)
I have to restart the Devo12S for new channel number to become active.

I did not test the latency. Would this be necessary?

Edit:
I would let the user choose between 1024 / 2048 for dsm2.
Or leave it as is with no x-channels for dsm2.
If switch to 2048 is automated for >7 channels people would have to re-bind all their >7 channels models.
Last edit: 29 Oct 2013 09:38 by Cesco.

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29 Oct 2013 09:57 - 29 Oct 2013 11:03 #15115 by vlad_vy
Replied by vlad_vy on topic 18 channels for DSM2 / DSMX ?
The choice between 1024 / 2048 for dsm2 will be with future releases, after 3.10, since we decided do not implement any new features with v3.10, only fixes.

Cesco, can you test next firmware version, with disabled unused X-Plus channels and more optimal x-channels arrangement?

Now you have tested:
ch13 = x1 (22ms)
ch14 = x2 (44ms)
ch15 = x3 (66ms)
ch16 = x4 (88ms)
ch17 = x5 (88ms)
ch18 = x6 (88ms)
ch19 = x7 (88ms)
ch20 = x8 (88ms)

Next firmware have x-channels arrangement:
ch13 = x1 (22ms)
ch14 = x5 (22ms)
ch15 = x2 (44ms)
ch16 = x6 (44ms)
ch17 = x3 (66ms)
ch18 = x7 (66ms)
ch19 = x4 (88ms)
ch20 = x8 (88ms)

If you can test/compare delays with both versions, it will be nice.

SORRY, I FOUND ERROR IN CODE. FIRMWARE DELETED.

P.S. I'm not sure, but probably for new channel number to become active will be enough press 'Bind' button.

P.S. Since you got positive result with unused X-Plus channels, I can say that unused X-Plus channel has data format 0xFFFF, the same as unused normal channels.
Last edit: 29 Oct 2013 11:03 by vlad_vy.

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