18 channels for DSM2 / DSMX ?

Corrected firmware

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Is it for last firmware? I don't quite understand, all 8 x-channels are in working state?

The sequence 0 4 1 5 2 6 3 7 - it's because for first packet = 0 1 2 3 and for second packet = 0+4 1+4 2+4 3+4 (0 1 2 3). If I do not change counter for second packet, it's normal sequence. With optimal arrangement it always will be not in series.

If you test previous firmware, you will find 0 1 2 3 4 5 6 7, but only first 3 x-channels have delays 22ms, 44ms, 66ms, and all others have delay 88ms.

If you will look in capture from DX18, it's not in series.

If you have tested your software with DX18 and software works with DX18 and Devo12, it seems we got working version.

Last question, what will be best, last firmware with optimal delays or previous firmware with x-channels in series (0 1 2 3 4 5 6 7)?

The X-Plus channels structure

Channel numbers 0 to 11 are normal, with data resolution 11bit (2048).
Channel 12 carries the X-Plus channels, with data resolution 9bit (512).

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

X-Plus data format
each 16bit X-Plus data value is defined as:

a bbbb cc ddddddddd

a: always 0
bbbb: the channel number, always 12
cc: X-Plus channel number, low 2 bits, third bit defined by packet number, 1st packet = 0, second packet = 1
dd..: X-Plus channel data, 9 bits, 256 is midpoint

The channel data will be 0xffff if the specific X-Plus channel slot is unused.

1 to 2 X-Plus channels, every 22ms
3 to 4 X-Plus channels, every 44ms
5 to 6 X-Plus channels, every 66ms
7 to 8 X-Plus channels, every 88ms

Cesco, I have new idea. If you can bind/test your software with DSM2 1024 mode and DX18, I can build firmware with X-Plus for DSMX and DSM2 (1024). I think it will work also.

Now I think you are right. It's unlikely that X-Plus 8 module can decode two different channel fields.

In that case we need wait next release. After that will be possible to implement 1024/2048 switching for DSM2 protocol.

Now I have protocol option and can use it.



But, I don't know how to disable 'DSM2 resolution' change (from default 1024) if number of channels < 8?

It seems all issues solved. But it required thorough testing.

Cesco, can you test all modes: < 8 channels (1024), > 7 channels (1024), > 7 channels (2048), X-Plus cnannels?



At protocol options page you can select all you want, but:
1) if you have number of channels < 8, next time you visit protocol options page you will see 'DSM2 resolution' = 'Steps: 1024';
2) before you can get number of channels > 12 you have to select 'X-Plus channels' = 'On';
3) if you select 'X-Plus channels' = 'On', number of channels > 7, next time you visit protocol options page you will see 'DSM2 resolution' = 'Steps: 2048', you don't need select it manually, it will change automatically;
4) X-Plus channels started from 13 channel (X-Plus 1), 14 channel (X-Plus 5), 15 channel (X-Plus 2), 16 channel (X-Plus 6), and so on.


For DSMX protocol resolution is always 11bit(2048).


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

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Devo12 filesystem

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RBE, I can provide you changed files, if needed (protocol\dsm2.c, protocol\interface.h, target\devo12\target_defs.h)

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