hi Mathias Ag
you are right.We can calculate the pitch/poll but not Yaw,which compass
sensor can.So Lis302/331 sensor can only detect accelerometer and rotation
as poll/pitch,it's hart for rotation as a compass.
thanks
--wxc200
============
自由之精神，独立之人格
============
Timothy Leary - "Women who seek to be equal with men lack ambition."
On Sat, Jan 10, 2009 at 6:41 AM, Mathias Agopian <[email protected]>wrote:
>
> On Fri, Jan 9, 2009 at 5:31 AM, Sean McNeil <[email protected]> wrote:
> >
> > What you are trying to do cannot be done. Accelerometers give you a
> > vector to GC whereas the G1 has a compass which gives you yaw/pitch/roll
> > to north.
>
> It is not too difficult to calculate yaw/pitch/roll from the
> geomagnetic vector and acceleration vector.
>
> You can find all the math in cupcake's SensorManger, see
> getRotationMatrix() and getOrientation().
>
>
> Of course, with a device that only has an accelerometer, you cannot
> calculate "yaw", but only pitch and roll.
>
> Mathias
>
> >
> > 伊泽 wrote:
> >> hi pramod gurav,
> >>
> >> I think we have the same problem,the lis302/lis331 sensor cannot provide
> >> yaw/pitch/roll data while we feel hard to emulate G1's compass feature.
> >>
> >> But I thought there would be some method to emulate that,,,we get the
> >> x/y/z
> >> and change them to yaw/pitch/roll through a model...
> >>
> >> hmm,,that's not easy,i think.
> >>
> >> thanks
> >> --wxc200
> >>
> >>
> >>
> >> ============
> >> 自由之精神，独立之人格
> >> ============
> >> Zsa Zsa Gabor - "I'm a great housekeeper. I get divorced. I keep the
> >> house."
> >>
> >> On Fri, Jan 9, 2009 at 6:59 PM, pramod gurav <[email protected]
> >> <mailto:[email protected]>> wrote:
> >>
> >> On Fri, Jan 9, 2009 at 3:27 PM, 伊泽 <[email protected]
> >> <mailto:[email protected]>> wrote:
> >> > hi
> >> >
> >> > why not port your driver to android?
> >> > That would not be too hard. G1 has a compass and
> >> > gravity accelerometer sensor,it can detect pitch/roll/rotation
> >> and motion.
> >> > Also Iphone ,Borqs and Openmoko has the LIS3XX chip as their
> sensor.
> >> > this is openmoko's: Accelerometer data retrieval
> >> > But lis3xx sensor is a gravity accelerometer sensor,it has
> >> > not function as G1's compass,when you put phone on the flat
> >> table ,it cannot
> >> > detect rotation.
> >> >
> >> > Ofcourse,you should choose your sensor depend on the app design.
> >> >
> >> > thanks
> >> > --wxc200
> >> >
> >> >
> >> Hi I have ported the drivers according to android.
> >> The sensors on my h/w are ak8973(magnetic x,y,z) and lis302dl(acc
> >> x,y,z).
> >> They do not give the yaw, pitch roll.
> >> I could get the values on my android application.
> >> But cant get the yaw, pitch and roll. I was expecting that Android
> can
> >> calibrate
> >> these values as my h/w have no support.
> >>
> >>
> >>
> >> > ============
> >> > 自由之精神，独立之人格
> >> > ============
> >> > Joan Crawford - "I, Joan Crawford, I believe in the dollar.
> >> Everything I
> >> > earn, I spend."
> >> >
> >> > On Fri, Jan 9, 2009 at 3:26 PM, Mathias Agopian
> >> <[email protected] <mailto:[email protected]>>
> >> > wrote:
> >> >>
> >> >> Hi,
> >> >>
> >> >> Android doesn't "require" yaw / pitch / roll per se. In theory,
> >> well
> >> >> written applications should check for the presence of these
> >> sensors.
> >> >> Unfortunately, in Android 1.0 there wasn't an easy way to
> >> integrate a
> >> >> new sensor h/w.
> >> >>
> >> >> I think it is more sane to target the "cupcake" release of
> Android,
> >> >> which a work in progress is available in the main git repository.
> >> >>
> >> >> Future (cupcake) applications will be able to use the
> SensorManager
> >> >> to calculate the yaw / pitch / roll from the acceleration and
> >> magnetic
> >> >> data (this is actually more precise than the data coming out of
> the
> >> >> driver!). Additionnaly, there is a HAL module to implement your
> >> sensor
> >> >> h/w which describes precisely what is expected from the higher
> >> layers
> >> >> (see sensors.h).
> >> >>
> >> >> A sensor h/w can expose yaw/pitch/roll if it wants to, but is not
> >> >> technically required; the framework will expose a "fake"
> >> >> yaw/pitch/roll sensors if one is not published by the sensor
> >> HAL and
> >> >> if Acceleration and Magnetic data are available.
> >> >>
> >> >> Note that the definition of the axis at the h/w level have
> changed
> >> >> between 1.0 and cupcake, so be sure to read carefully the
> >> >> documentation in sensors.h.
> >> >>
> >> >>
> >> >> Android doesn't do ANY calibration on its own. The drivers
> >> and/or HAL
> >> >> modules are expected to do this.
> >> >>
> >> >>
> >> >> In "theory", all you need to do is implement a sensor HAL module
> >> >> properly (as documented in sensors.h. pay extreme attention to
> the
> >> >> definition of the axis and units). Unfortunately, in the
> >> current git
> >> >> repository there are no sample code of a sensor HAL module, which
> >> >> makes this task more difficult; however we will fix this
> >> problem soon
> >> >> by including the G1 HAL module source code, stay tuned.
> >> >>
> >> >> I hope this helps.
> >> >>
> >> >> Mathias
> >> >>
> >> >>
> >> >> On Thu, Jan 8, 2009 at 9:45 PM, pramod gurav
> >> <[email protected] <mailto:[email protected]>>
> >> >> wrote:
> >> >> >
> >> >> > Hi All,
> >> >> > I am trying to integrate my compass and accelerometer sensors
> >> into
> >> >> > android.
> >> >> > These are two different sensors which support only providing
> >> magnetic
> >> >> > x, y, z and
> >> >> > acceleration in x, y and z direction. As I gone through the
> >> HAL layer
> >> >> > of android I
> >> >> > could know that android expects yaw, pitch, row also from the
> >> under
> >> >> > lying driver.
> >> >> > I just wanted to conform this as the sensors we are using
> >> does not
> >> >> > give any values
> >> >> > other than above mentioned.
> >> >> > I would also like to know whether android does any
> >> calibration on its
> >> >> > own to get these
> >> >> > values in case these are not supported by hardware.
> >> >> > Please let me know if I need to provide more details regarding
> my
> >> >> > sensors.
> >> >> >
> >> >> >
> >> >> > --
> >> >> > Best Regards
> >> >> > Pramod
> >> >> >
> >> >> > >
> >> >> >
> >> >>
> >> >>
> >> >
> >> >
> >> > >
> >> >
> >>
> >>
> >>
> >> --
> >> Best Regards
> >> Pramod
> >>
> >>
> >>
> >>
> >> >
> >
> >
> > >
> >
>
> >
>
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