[Gta04-owner] Second trial with QtMoko2

[H. Nikolaus Schaller]

Hi Sven,

> Am 17.04.2018 um 15:46 schrieb Sven Dyroff <S.Dyroff at phytec.de>:
> 
> Hello Nikolaus, 
> 
> > The A3 has a HMC5883, the A4 has BMA180, the A5 has a BMC150 and the Pyra has a BMC150 or BNO055. 
> > So different sensor chips all seem to have the same effects. 
> > 
> > Therefore, I think it is not the low level chip driver (we always use the iio driver 
> > of Linux) but something on higher level up into QtMaze... 
> 
> perhaps the accelerometer drivers of Linux kernels without device tree behave different than those with device tree? 

Indeed. I did a test to install letux-3.7-neil-plus-plus kernel on the µSD with latest QtMoko
and (after haking some boot problems), I could run evtest /dev/input/accel as well.

It looks as if it is much more often reporting accelerometer events (ca. 15ms) than the 4.16 kernel (ca. 100-200ms).

This means either the chip drivers or the input event system has changed - or both.

And I had found a bug in Radek's original GTA04 code which is less a problem for
fast accelerometer reports but for those coming more rarely.

But neither change has the effect of making the graphics faster and smoother.

So there is likely a third factor involved when comparing to GTA02.

BR,
Nikolaus

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