[Gta04-owner] Second trial with QtMoko2

[H. Nikolaus Schaller]

Hi Sven,

> Am 12.04.2018 um 14:19 schrieb Sven Dyroff <S.Dyroff at phytec.de>:
> 
> Hello Nikolaus, 
> 
> fine, but this will "only" correct the swapping. It will still not correct the calibration. 
> 
> Whereat the comments of the affected source give a nice hint: "On my GTA04, sitting flat on the table, the raw Z acceleration value is about 256, so we divide by 256 here." 
> 
> So I suggest to add a further printf of the value of "accel -> z", in order that your code will provide you the needed calibration data that you can then use for "accel -> [xyz]scale" in case of having detected a GTA04A5. 

It is easier than a printf: evtest /dev/input/accel reports the range [0..512] and the current values.

I have checked that and the GTA04A5 also reports roughly 256.

So I think you should test (after I have uploaded it to the server) if it is now ok for you.

BR,
Nikolaus

> 
> Best regards 
>    Sven 
>     
> 
> 
> 
> 
> Von:        "H. Nikolaus Schaller" <hns at goldelico.com> 
> An:        Sven Dyroff <S.Dyroff at phytec.de> 
> Kopie:        List for communicating with real GTA04 owners <gta04-owner at goldelico.com> 
> Datum:        11.04.2018 19:21 
> Betreff:        Re: [Gta04-owner] Second trial with QtMoko2 
> 
> 
> Hi Sven, 
> 
> Am 05.04.2018 um 18:05 schrieb Sven Dyroff <S.Dyroff at phytec.de <mailto:S.Dyroff at phytec.de>>: 
> 
> Hello Nikolaus, 
> 
> > I have now booted my GTA04A4 and the orientation is completely correct. 
> > Hm. Maybe a subtle difference between GTA04A4 and A5? They use different accelerometer chips. 
> 
> something like that is what I already assumed. Would have wondered me if some scaling factors would have gone lost by just rebuilding QtMoko... 
> 
> I have now added a device version detection to swap the horizontal axis if we run on a GTA04A5: 
> 
> http://git.goldelico.com/?p=gta04-qtmoko.git;a=commit;h=04c30a3b18be8b55148427d6c63423837f6a77cc <http://git.goldelico.com/?p=gta04-qtmoko.git;a=commit;h=04c30a3b18be8b55148427d6c63423837f6a77cc> 
> 
> I have not yet published the new debian packages, but will do soon. So apt-get update will not 
> yet find anything new. 
> 
> BR, 
> Nikolaus 
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