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Re: u-blox : layers are confusing me
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From: |
Gary E. Miller |
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Subject: |
Re: u-blox : layers are confusing me |
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Date: |
Sat, 20 May 2023 14:18:38 -0700 |
Yo Hans!
On Sat, 20 May 2023 22:57:54 +0200
Hans Mayer <gpsd@ma.yer.at> wrote:
> > ... The "layer" in VAL_SET is not an integer like you are
> > thinking,
> it is a bit map.....
>
> Ok, this I didn't realise. Now is everything clear. Is this
> described anywhere? I didn't see it. But probably it is.
As I said, it is decribed in this doc:
ZED-F9P_InterfaceDescription_(UBX-18010854).pdf'
This gives an overview, but it not very clear:
Section 5.3 Configuration Layers
The bit mask is described here:
3.10.26 UBX-CFG-VALSET (0x06 0x8a)
Note that VALGET behaves differently:
3.10.26 UBX-CFG-VALSET (0x06 0x8a)
> I understand, "0" as bitmap does nothing.
Yup. For VALSET, onlye.
> But why is parameter "1" in ubxtool changing layer 0 which is RAM ?
The answer is here:
Section 5.3 Configuration Layers
Whan you chnage a layer, the Layer 0 is recomputed.
And note, we are only talking about VALSET.
> It must be:
>
> 0 - nothing
Yes.
> 1 - set layer 0 (ram)
Yes. But better to think of it that Layer 0 is recomputed from the layers.
> 2 - set layer 1 (bbr)
Yes. And Layer 0 is recomputed. Maybe over-riddend by layer 1.
> 3 - set layers 0 and 1
No. 1 and 2. recomputing 0.
> 4 - set layer 2 (flash)
Yes. And Layer 0 is recomputed. Maybe over-riddend by layer 1 or 2.
> 5 = set layers 0 and 2
No. 1 and 4. recomputing 0.
> 6 - set layers 1 and 2
No. 2 and 4. recomputing 0.
> 7 - set layers 0, 1, 2
No. 1, 2 and 4. recomputing 0.
> >... Spend some quality time reading Section 5.3 of this
>
> I did, not only once, but didn't find the answer.
This is u-blox, it only contrains the possible anssers. Then re-read
VALGET and VALSET.
RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
gem@rellim.com Tel:+1 541 382 8588
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