[Gta04-owner] Second trial with QtMoko2
H. Nikolaus Schaller
hns at goldelico.com
Thu Apr 12 19:35:10 CEST 2018
Hi Sven,
> Am 12.04.2018 um 17:55 schrieb Sven Dyroff <S.Dyroff at phytec.de>:
>
> Hello Nikolaus,
>
> have you tried if GTA04A5 now moves the ball in QtMaze as smooth, fast and natural and without stuttering as the GTA04A4?
Well, I don't know what you expect for "smooth, fast and natura"l, I just found that they move almost the same now
between both devices - and qtmoko2.
I don't have time to make a 2nd SD cards to boot two devices and compare them in parallel...
So answering this question seems to be in better hands if you do it.
BR,
Nikolaus
>
> Best regards
> Sven
>
>
>
>
>
> Von: "H. Nikolaus Schaller" <hns at goldelico.com>
> An: List for communicating with real GTA04 owners <gta04-owner at goldelico.com>
> Datum: 12.04.2018 14:52
> Betreff: Re: [Gta04-owner] Second trial with QtMoko2
> Gesendet von: "Gta04-owner" <gta04-owner-bounces at goldelico.com>
>
>
>
> Am 12.04.2018 um 14:32 schrieb Sven Dyroff <S.Dyroff at phytec.de <mailto:S.Dyroff at phytec.de>>:
>
> Hello Nikolaus,
>
> it would astonish me if you're right, but of course I'll then test it again in order to give you a chance to astonish me... :-))
>
> I have done this test for you:
>
> GTA04A4 and GTA04A5 with display upside on the table with the same µSD card (i.e. boot A5 first, then swap card and boot A4).
> Run evtest /dev/input/accel | head -20 and write down highest X/Y/Z values.
>
> On a GTA04A5:
>
> root at letux:~# evtest /dev/input/accel | head -20
> Input driver version is 1.0.1
> Input device ID: bus 0x0 vendor 0x0 product 0x0 version 0x0
> Input device name: "accelerometer-iio-input-bridge"
> Supported events:
> Event type 0 (EV_SYN)
> Event type 3 (EV_ABS)
> Event code 0 (ABS_X)
> Value 14
> Min -511
> Max 511
> Event code 1 (ABS_Y)
> Value -32
> Min -511
> Max 511
> Event code 2 (ABS_Z)
> Value -253
> Min -511
> Max 511
> Properties:
> Testing ... (interrupt to exit)
> root at letux:~#
>
> This means: X=14/256 = +5%, Y=--32/256 = -12%, Z=-253/256 = -99%
>
> On a GTA04A4:
>
> root at letux:~# evtest /dev/input/accel | head -20
> Input driver version is 1.0.1
> Input device ID: bus 0x0 vendor 0x0 product 0x0 version 0x0
> Input device name: "accelerometer-iio-input-bridge"
> Supported events:
> Event type 0 (EV_SYN)
> Event type 3 (EV_ABS)
> Event code 0 (ABS_X)
> Value -15
> Min -511
> Max 511
> Event code 1 (ABS_Y)
> Value -5
> Min -511
> Max 511
> Event code 2 (ABS_Z)
> Value 274
> Min -511
> Max 511
> Properties:
> Testing ... (interrupt to exit)
> root at letux:~#
>
> This means: X=-15/256 = +6%, Y=--5/256 = -2%, Z=274/256 = +107%
>
> Comparing A4 and A5: they basically behave *the same* regarding the range
> and report both +/-256 for 1g. They just differ in the orientation of the sensor.
>
> I.e. the Z axis also has a sign error. This is still missing in my correction patch.
> To make it really precise I should rotate both devices by 90° and write down all
> values...
>
> What I don't know and can't compare is if they behave like a GTA02... And
> if a total value of ~1g is what QtMaze expects. And if the QtMaze makes use
> of the Z-axis at all (doesn't look as if it does).
>
> BR,
> Nikolaus
>
>
>
> Best regards
> Sven
>
>
>
>
>
> Von: "H. Nikolaus Schaller" <hns at goldelico.com <mailto:hns at goldelico.com>>
> An: List for communicating with real GTA04 owners <gta04-owner at goldelico.com <mailto:gta04-owner at goldelico.com>>
> Datum: 12.04.2018 14:25
> Betreff: Re: [Gta04-owner] Second trial with QtMoko2
> Gesendet von: "Gta04-owner" <gta04-owner-bounces at goldelico.com <mailto:gta04-owner-bounces at goldelico.com>>
>
>
>
>
> Hi Sven,
>
> Am 12.04.2018 um 14:19 schrieb Sven Dyroff <S.Dyroff at phytec.de <mailto: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 <mailto:hns at goldelico.com>>
> An: Sven Dyroff <S.Dyroff at phytec.de <mailto:S.Dyroff at phytec.de>>
> Kopie: List for communicating with real GTA04 owners <gta04-owner at goldelico.com <mailto: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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