SmartMotion® MEMS Motion Sensors

Hi,

We've got bunch of TI SensorTag CC2650 which sport MPU9250 motion sensor. In TI's wiki it is mentioned that for calibration we should refer to InvenSense. I searched the forum and sent a message to support. But no luck.

Could someone point me to a document or something that explains how I can calibrate MPU9250 motion sensors?

Any help is greatly appreciated.

Cheers

Farzad

Hello,

I'm using the MPU-9250 on a custom PCB. Communication is done via SPI in FPGA logic. The gyro full scale is set to +/- 250 dps. Changing the full scale scales z, x and y data equivalently as expected. Default register values and registers with constant values like WHO_AM_I (0x75) read back expected values. I can also write registers and read back the same value that I wrote so I'm confident the SPI interface is working.

I am running the MPU-9250 using the SPI interface. I am able to read all registers correctly (including whoami) which verifies that the hardware is wired properly. I am trying to collect data in the FIFO and read it out in a loop. On power up everything works fine, I read the number of FIFO bytes and I get 512, I then read out those 512 bytes and attempt to continue the loop. However after only a few cycles the FIFO empties and never refills. When I read the number of bytes it always returns zero even though the FIFO is still enabled. Has anyone else experienced this problem?

Does anyone have a basic set of sample code for the Embedded MotionDriver 6.12 for the 9250 (or 6050). Just something that does initialization and exercises a few functions from the Motion Processing Library? I'm trying to get this running on a Simblee (which uses a Cortex M0), using embedXcode, and it would be really helpful to have a set of sample code that I know should work (it's fine if the sample is not from embedXcode -- anything would help).

Does anyone have information on the precision of the temperature sensor in the MPU-6050
Some accuracy figures are available but we cant find anything on precision.

I'm trying to get the MPU9250 self-test to work. It's not clear from the register map how to calculate the MPU9250 gyro and accelerometer factory trim values using the contents of the SELF_TEST registers.

Does anybody know how to do this?

hi i am using mpu6050 at threshold setting- 1 , motion duration 1 , lpf-0, dhpf- 4, FSL- +-2G with internal frequency ,
I2C is at 100 Khz and mcu at 2khz , please guide me what can be the issue is not able to generate interrupt when i am giving very high accleation to the mpu
.i am using only acclerometer others i have disabled.
thanks

Hi,

I need linux driver for MPU9250 and need source for compensating gravity and to process the raw data. Can anyone help from where to start.

hi,

i had writen below values to 2 registers of MPU9250 via IIC:

MPU9250_PWR_MGMT_1 = 0x41 and
MPU9250_PWR_MGMT_2 = 0x3f

but it looks like MPU9250 had not slept because current is still high.

another question is how to wake up slept MPU9250, can it be waken up by a simple iic read/write or only power recycle can wake it up?

thank you.
kerry.