Problems Reading Accelerometer Device

Andy Green andy at
Wed Nov 26 15:32:35 CET 2008

Hash: SHA1

Somebody in the thread at some point said:
| On Wed, 26 Nov 2008 11:28:23 +0100
| Michael Tansella <michael-tansella at> wrote:
|> I read the wiki and the gestures source code but it didnt't help.
|> I set the samplerate to 400 Hz and though I think the time between
|> two (x y z separator) measurements should be ca 2,5 ms, but in my
|> logfile you can see that there are sometimes 30 ms. So I think I
|> loose some values.
| Along similar lines, while making some improvements to OpenMooCow I
| noticed that opening the accelerometers with O_NONBLOCK still leads to
| read() blocking for many milliseconds as described.  Sometimes much
| longer due to the threshold option.  Should the accelerometers (meaning
| the "input" subsystem, I guess) support non-blocking reads in the 2.6.24
| kernel?

Can you not do a select() to see how the land lies before doing the read?

- -Andy
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