Hi,
On Thu, 2016-03-17 at 18:11 +0000, Ge Gao wrote:
> Hi Matt,
> I am not sure about slave 4. I always use slave0~3. MPU6050 can
> connect up to 4 slaves by using slave 0~3. However, we only use 3 slaves.
> Each slave can be configured as read or write independently. For example,
> AKM8973 compass as a slave, I usually configure slave0 as read and slave 1
I also usually use slaves 0~3. However now you mention it as being 100Hz...
doesn't this depend on a) the rate configured in MPU and b) the part itself
(MPU9250 has a different internal sampling rate)?
> For pressure sensor or ALS(light/proximity sensor), they all have
> autonomous mode. As long as the sample period is longer than the output
> rate, the data is guaranteed to be new data.
I think his use of slave4 is mostly because of the interrupt that is availabe.
Depending on the sensor you are connecting, the sample rates not matching may
be a problem.
Suppose your sensor is giving you data at 125Hz. This means every ~4 samples you will loose one sample. The other case of sensor with update at 75Hz is also problematic since you may get old data - and depending on the sensor you don't have a way to know if the data is invalid.
What am I missing?
thanks
Lucas De Marchi��.n��������+%������w��{.n�����{��(��)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
