Dead Accelerometers? (was Re: accelerometer jitter)

[Joel Newkirk]

On Sat, 20 Sep 2008 19:44:34 -0400, Joel Newkirk <freerunner at newkirk.us>
wrote:
> On Sat, 20 Sep 2008 17:36:00 -0400, "Michael Fisher" <desnotes at gmail.com>
> wrote:
>> On Sat, Sep 20, 2008 at 4:07 PM, Joel Newkirk <freerunner at newkirk.us>
>> wrote:

>> could you run a test while driving/riding in the car and post what the
>> readings might be? I was thinking of the possibility of having the FR
>> determine if it was in a moving car or not.

> No problem, I'll alter the script to intersperse timestamps and take it

Ummm, turns out it IS a problem:  I can't get any data from either
accelerometer now.

I now see:
root at iota:~# cat /sys/devices/platform/spi_s3c24xx_gpio.1/spi0.1/dump
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 3b
93 af b8 11 12 03 03 84 16 ee 0b 40 00 00 00 00
07 00 e4 00 00 00 00 00 00 fa 00 03 00 0b 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

regardless of any orientation changes or movement of the Freerunner -
completely unchanging output.

The third line used to look something like this (faceup):
47 00 e4 00 00 00 00 00 00 01 00 01 00 35 00 00

The first '01' is X, the second '01' is Y, the '35' is Z.  Those three
values are all that changed.

I've tried rebooting, I've tried powerdown and restart, both without and
with battery removal, I've tried explicitly activating the sensor (hadn't
needed to before) at
/sys/devices/platform/spi_s3c24xx_gpio.1/spi0.1/power/wakeup.  Same with
spi0.0 sensor - unchanging near-zero outputs on all three axes.  (Values
wrap from 00 to FF with FF representing '-1' - IE the face-down reading
would have something around C5 for the Z reading)

I'm about to reflash and reconstruct my environment, (I'd added celtune
repository to get linphone running, forgot to remove it and opkg upgrade
pulled a bunch of packages from there - after a second opkg upgrade
enlightenment is broken and won't start on reboot) will update afterwards,
and hopefully be able to post the requested data tomorrow...

j