On Wed, Aug 22, 2012 at 16:09:22, Chinmay V S wrote: > Hmmm. Interesting. As i understand LIS331DLH provides 16bit data > irrespective of the full-scale/sensitivity configuration. Hence we > could effectively map +/-2G to +/-32768(signed 16bit 2's complement). > According to the current-patch right-shifting the register values by > 4(i.e. reducing 16bit --> 12bit) will mean that we lose accuracy by > ~1mG. > > Clearly this will NOT affect use-case like display-orientation in > smart-phones, but surely medical and industrial applications WILL > benefit from the additional accuracy by utilising the entire 16-bit > resolution provided by LIS331DLH hardware. > > I went through the LIS331DLH datasheet/application-note from > http://www.st.com/internet/analog/product/218132.jsp and i'm a bit > confused from your statement about +/-2G being 12bit data. Nowhere is > it mentioned that LIS331DLH provides +/-2G|+/-4G|+/-8G as 12|13|14 bit > data respectively. Then again i might be wrong... >
Look at this application note which talks about the outdata values for 2G range (page 12/31) http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/APPLICATION_NOTE/CD00215823.pdf Corresponding to the 4G and 8G I got the details form older patches (SHIFT_ADJ_4G and SHIFT_ADJ_8G). http://driverdev.linuxdriverproject.org/pipermail/devel/2010-November/009685.html We can easily interpret number of bits for 4G and 8G from 2G information. Thanks AnilKumar -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
