SmartMotion® MEMS Motion Sensors

Hello,

I used motion_driver-5.1.3 as a guide to port to ATmega328 (in pure C, not Arduino).

I am able to initialize the DMP and send the values from fifo_read to the serial Port. The problem is I always get the same values.
So my question is: can I do a function call in a loop or is it mandatory to use interrupts? if interrupts, please elaborate, because I tried and had no success.

Other doubts I have:
- using the quaternion "option" I get a packet with 17 values, what does each represent ?
- are they integers or can be floating point ?

Regards

Hello,

Hello,

I launch MPU9250 with DMP and when i reset my board, MPU9250 is not responding anymore to who am I.

Is there any way to force reset of MPU9250 (full reset with DMP like if it was just powered on) ?

Hi,

I have a MPU-9150 breakout board and a MPU-9250 breakout board. The DMP register information seems to be missing from the chip register maps. Are they recorded elsewhere?

Thanks,
Jack

For the MPU9250, and motion 6.12 library, it would be beneficial to be able to save the hard-iron calibration values and load to the MPU library on startup without requiring a Figure 8 motion to calibrate. This is desired for equipment mounted applications where calibration after mounting is not trivial and would be inconvenient following system restart.

Is there any interface read or write the compass bais values for the hard iron calibration?

Hi,

We are prototyping a new product and are running into an unexpected problem. We currently have multiple ICM-20608's (from 2 to 4+) and we are seeing increased noise when more then one IMU is reading.

We are troubleshooting whether the issue is electrical noise, or mechanical resonance from an adjacent ICM.

Has anyone done similar? Any input / hunches would be wildly helpful!

Right now our fall back plan is to just run one IMU, but we'd love to get the lower noise by using / averaging 4+

Thanks!

Tabb

Hi, I am new to using the IAR Workbench ARM for compiling the MotionDriver6.12. I am familiar with C/C++ but not this tool. When I press compile, IAR tells me that it cannot find all header files and it seems to me that it is an issue with it not knowing the path of the library files. The project file by default is in ..\motion_driver_6.12\arm\STM32F4_MD6\Projects\eMD6\EWARM, but the other files are one directory above: in \motion_driver_6.12\arm\STM32F4_MD6\Projects\eMD6. Could this be why IAR is telling me it cannot find the header (.h) files?

Does anyone know where I can download 'Programming Sequence for DMP Hardware Functions'?

thanks

Hi all,

I am trying to determine the specifications on the MPU9250 for SPI communication, as the technical documentation from InvenSense is unclear.

In particular, the InvenSense website says the following about the MPU9250 spi communication:
– "1MHz SPI serial interface for communicating with all registers"
– "20MHz SPI serial interface for reading sensor and interrupt registers"

To me, this means that 20MHz can be used to read not only register 0x3A (interrupt status register), but also sensor registers (is this correct?).