I2C internally using SPI to acquire mpu9250 geomagnetism

RE: I2C internally using SPI to acquire mpu9250 geomagnetism

y001 — Wed, 31 Jul 2019 01:17:45 GMT

Solved by performing delay after every nrf_drv_spi_transfer

RE: mpu9250 SPI communication

y001 — Fri, 26 Jul 2019 00:19:18 GMT

23 pages of data sheet

Auxiliary I2C Bus Modes of Operation: 
• I2C Master Mode: Allows the MPU-9250 to directly access the data registers of 
external digital sensors, such as a magnetometer. For example, In I2C Master mode, 
The MPU-9250 can be configured to perform burst reads, returning the following data
from a magnetometer:  X magnetometer data (2 bytes)  Y 
magnetometer data (2 bytes)  Z magnetometer data (2 bytes)
  The I2C Master can be configured to read up to 24 bytes from the auxiliary 
  sensors. A fifth sensor can be configured to work single byte read / write mode.

Can I still take the geomagnetic field with SPI?

RE: mpu9250 SPI communication

y001 — Thu, 25 Jul 2019 05:46:38 GMT

After all.if you want to communicate with mpu9250 by SPI, I also have to use I2C.

I made the setting to put the output of the geomagnetic field into EXT_SENS_DATA_00 ,but it dies not feel like I do the SPI internally.

RE: mpu9250 SPI communication

Richard — Wed, 24 Jul 2019 08:25:59 GMT

The magnetometer in the MPU9250 is only accessible via I2C - not SPI.