babak, You are in the wrong discussion forum for this topic. You need to join the android-platform group where they talk about porting, drivers, special kernel builds, and so on.
On Nov 18, 9:03 am, babak <bnade...@gmail.com> wrote: > Hey Bret, > Thank you for your fast answer. > Actually I never did it before. How should I start? Do you have any > related document which helps me? > > Thank you in advance, > > On Nov 18, 5:42 pm, Bret Foreman <bret.fore...@gmail.com> wrote: > > > 50Hz is nowhere near the capacity of the CPU to handle sensor data. > > I've run 2000 Hz on an ARM-7 and still had cycles to spare for other > > tasks. You'll need to create your own (C-code) ISR which loads values > > into a circular buffer and then unload the buffer from the Java side, > > passing the pointer to the buffer via JNI. > > > Of course, you will need to root the phone and rebuild the kernel and > > it will only ever work on rooted phones with your special kernel but > > it's totally doable. > > > On Nov 18, 8:25 am, babak <bnade...@gmail.com> wrote: > > > > Thank you for your answer, > > > Actually, I am using the HTC Desire and I just reach to 5Hz sampling > > > rate with Java-API. But it is too low for me. Do know how to reach to > > > 50Hz, it is not important whether by using standard API, JNI, or > > > working on the my phone's kernel. Actually, It is also Ok for me, if I > > > can reach to this performance just in my phone. > > > > Regards. > > > Babak > > > > On Nov 17, 9:04 pm, ip332 <iprile...@gmail.com> wrote: > > > > > Short answer: no, you can't read sensors directly. With some hacking > > > > steps and couple of weeks of hard work you might be able to duplicate > > > > Android's Sensors JNI with exactly the same (or even worse) > > > > performance which will work only on your super-rooted-hacked-one-of-a- > > > > kind phone. Why bother? > > > > > With respect to the second question: yes, you can, but the maximum > > > > speed is device (driver) dependent and sometimes could be too high for > > > > the device. I mean that reading sensors is not the final goal and you > > > > need to keep some CPU to process that data, right? > > > > Anyway, you need to start from reading Android > > > > documentation:http://developer.android.com/reference/android/hardware/SensorManager..., > > > > android.hardware.Sensor, int) > > > > > On Nov 13, 12:24 pm, babak <bnade...@gmail.com> wrote: > > > > > > Hello all, > > > > > > I am looking for a way to get sensors' data ( especially > > > > > Accelerometer) directly without using Listener approach. Actually I > > > > > need to have the data really fast!!! > > > > > > I can not find any way to read sensor data by myself. Anybody knows > > > > > anything about it? > > > > > Is it possible to read data with more than 50Hz? > > > > > > Regards, > > > > > Babak -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
