<font size=2 face="sans-serif">Hello Nikolaus,</font>
<br>
<br><font size=2 face="sans-serif">> It looks as if it is much more
often reporting accelerometer events (ca. 15ms) than the 4.16 kernel (ca.
100-200ms).</font>
<br>
<br><font size=2 face="sans-serif">> But neither change has the effect
of making the graphics faster and smoother.</font>
<br>
<br><font size=2 face="sans-serif">> So there is likely a third factor
involved when comparing to GTA02.</font>
<br>
<br><font size=2 face="sans-serif">no, I think you've found the cause!</font>
<br>
<br><font size=2 face="sans-serif">100-200ms results in a frame rate of
5 to 10 Hz which is awfully slow!</font>
<br>
<br><font size=2 face="sans-serif">We all know that for a smooth motion
presentation 20 to 25 Hz are needed at least!</font>
<br>
<br><font size=2 face="sans-serif">Very old black and white films had 16
pictures per second and at least the older ones of us still know how jerking
they looked.</font>
<br>
<br><font size=2 face="sans-serif">Best regards</font>
<br><font size=2 face="sans-serif"> Sven</font>
<br><font size=2 face="sans-serif"> </font>
<br>
<br>
<br>
<br>
<br><font size=1 color=#5f5f5f face="sans-serif">Von:
</font><font size=1 face="sans-serif">"H. Nikolaus Schaller"
<hns@goldelico.com></font>
<br><font size=1 color=#5f5f5f face="sans-serif">An:
</font><font size=1 face="sans-serif">List for communicating
with real GTA04 owners <gta04-owner@goldelico.com></font>
<br><font size=1 color=#5f5f5f face="sans-serif">Datum:
</font><font size=1 face="sans-serif">17.04.2018 16:16</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Betreff:
</font><font size=1 face="sans-serif">Re: [Gta04-owner]
Second trial with QtMoko2</font>
<br><font size=1 color=#5f5f5f face="sans-serif">Gesendet von:
</font><font size=1 face="sans-serif">"Gta04-owner"
<gta04-owner-bounces@goldelico.com></font>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>Hi Sven,</font>
<br>
<br><font size=3>Am 17.04.2018 um 15:46 schrieb Sven Dyroff <</font><a href=mailto:S.Dyroff@phytec.de><font size=3 color=blue><u>S.Dyroff@phytec.de</u></font></a><font size=3>>:</font>
<br>
<br><font size=2 face="sans-serif">Hello Nikolaus,</font><font size=3>
<br>
</font><font size=2 face="sans-serif"><br>
> The A3 has a HMC5883, the A4 has BMA180, the A5 has a BMC150 and the
Pyra has a BMC150 or BNO055.</font><font size=3> </font><font size=2 face="sans-serif"><br>
> So different sensor chips all seem to have the same effects.</font><font size=3>
</font><font size=2 face="sans-serif"><br>
></font><font size=3> </font><font size=2 face="sans-serif"><br>
> Therefore, I think it is not the low level chip driver (we always
use the iio driver</font><font size=3> </font><font size=2 face="sans-serif"><br>
> of Linux) but something on higher level up into QtMaze...</font><font size=3>
<br>
</font><font size=2 face="sans-serif"><br>
perhaps the accelerometer drivers of Linux kernels without device tree
behave different than those with device tree?</font><font size=3> </font>
<br>
<br><font size=3>Indeed. I did a test to install letux-3.7-neil-plus-plus
kernel on the µSD with latest QtMoko</font>
<br><font size=3>and (after haking some boot problems), I could run evtest
/dev/input/accel as well.</font>
<br>
<br><font size=3>It looks as if it is much more often reporting accelerometer
events (ca. 15ms) than the 4.16 kernel (ca. 100-200ms).</font>
<br>
<br><font size=3>This means either the chip drivers or the input event
system has changed - or both.</font>
<br>
<br><font size=3>And I had found a bug in Radek's original GTA04 code which
is less a problem for</font>
<br><font size=3>fast accelerometer reports but for those coming more rarely.</font>
<br>
<br><font size=3>But neither change has the effect of making the graphics
faster and smoother.</font>
<br>
<br><font size=3>So there is likely a third factor involved when comparing
to GTA02.</font>
<br>
<br><font size=3>BR,</font>
<br><font size=3>Nikolaus</font>
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