Is deco model correct in 3.18?

OSTC's running hwOS sport or tech
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jb2cool
Posts: 142
Joined: Tuesday 21. January 2014, 21:19

Is deco model correct in 3.18?

Post by jb2cool »

I've just dome a couple of dives with a computer that's recently been updated from 3.17 to 3.18 and the download looks a bit odd.

In Subsurface with 3.17 the 'extra info' for the computer used to say:
FW Version 3.17
Deco model ZH-L16-GF
Deco model info GF 30/85

Now with 3.18 i see:
FW Version 3.18
Deco model ZH-L16
Deco model info Saturation 77, Desaturation 78

The dive computer itself seems to think it's still in ZH-L16-GF with gradient factors 30/85, nothing has changed on that front other than updating the firmware.
Last edited by jb2cool on Sunday 3. April 2022, 19:45, edited 1 time in total.
heinrichsweikamp
Posts: 4370
Joined: Sunday 13. May 2007, 18:07

Re: Is deco model correct in 3.18?

Post by heinrichsweikamp »

Hi,

Nothing has changed on this point between 3.17 and 3.18.

What Decotype is stored in the internal logbook?

regards,
Matthias
jb2cool
Posts: 142
Joined: Tuesday 21. January 2014, 21:19

Re: Is deco model correct in 3.18?

Post by jb2cool »

Internal logbook seems to look correct (I didn’t think about looking there). Hopefully this is just a display thing then.

I’ll maybe the an old version of Subsurface to see what that looks like on there.
jb2cool
Posts: 142
Joined: Tuesday 21. January 2014, 21:19

Re: Is deco model correct in 3.18?

Post by jb2cool »

Thanks, looking at this I think it’s something broken on the Subsurface end.

Downloading my old dives using older firmware versions also displays this issue on the current Subsurface but if I step back and use an older version (only tried 5.0.5 so far) they all download fine.

I’ll raise this directly with the subsurface devs
harv
Posts: 10
Joined: Sunday 16. January 2022, 11:20

Re: Is deco model correct in 3.18?

Post by harv »

I looked into this a bit. I'm not sure about the earlier version, but checked the hwos_interface.pdf in the hwos source tree. It seems like libdivecomputer is using byte 82 (Dive mode), which is 0 for OC and 1 for CCR. Instead of byte 79 (Deco model), which is 0 for ZH-L16 and 1 for ZH-L16-GF.

There is another problem, for the Saturation / Desaturation information it uses the byte number (77 and 78) instead of the contents for those bytes. Otherwise it would probably have shown saturation as GF low and desaturation as GF high.

So if you're diving CCR with ZH-L16-GF you would get the correct information.
harv
Posts: 10
Joined: Sunday 16. January 2022, 11:20

Re: Is deco model correct in 3.18?

Post by harv »

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