Thanks for your input but hardware was fine.
I now could fix the problem by rewriting the SPI+DMA framework: There was some bug where the RX handler wouldn't get called correctly.

Hi, i already updated to FW2.1, changed SPI communication to 16bit and powering on the IMU after the SPI readout, but i still get no response at all. (at P1 all jumpers are disconnected)

Hi again,

now I tried a lot to and it still doesn't work. I'm running the preinstalled OpenIMU "IMU" application (and also tried it with installing the online available bin).

I removed the Jumpers from P1 to enable SPI mode but the IMU simply doesn't answer.
Also I tried different registers (hw version, software version, etc.) and SPI frequencies (from 100kHz to 1MHz) but there's no reply anyway.

When i fit the jumpers the online-webserver connection works fine.

Do you have any idea what could be wrong here?

Best Regards
Thomas

Thanks a lot for sharing this information!

do you have any idea how much latency that introduces and how accurate the timestamps (including the whole chain) are?

Hi,

is it possible to get (accurate) timestamps of the accelerometer/gyrometer measurements?
for now the IMU app runs in a loop and only collects+filters/applies calibration to data but I couldn't find any IMU timestamp.

some IMUs offer interrupt lines which may be used to timestamp them (using input capture timers) or have timestamps attached to their measurements -- is it possible to get any of these working with OpenIMU? (at least µs accuracy would be good)

Best Regards
Thomas