nRF52480 I2C Interface with Invensense ICM 20948

[Coppers Copernicus]

Hello peeps,

nRF52480 I2C Interface with Invensense ICM 20948. I am using SDK 15.2. I see there is some Support for MPU 6050 Invensense but not for ICM 20948. A lot of Registers have been changed in fact there are Register Banks added to the ICM. Kindly provide some Kind of source to generate a double tap Interrupt and start getting the Acc, Gyr, Mag (PS: Magnetometer config. in this device is really strange) data from the sensor using the nordic MCU and send it over BLE to another nordic chip. Any Kind of help would be much appreciated. Thanks in advance

Regards,

Coppers

[Nguyen Hoan Hoang]

Source code example sending ICM-20968 data to Thingy App. 

https://github.com/IOsonata/IOsonata/tree/master/ARM/Nordic/exemples/BlueIOThingy

Eclipse based project to compile 

https://github.com/I-SYST/EHAL/tree/master/ARM/Nordic/nRF52840/exemples/BlueIOThingy

https://github.com/IOsonata/IOsonata/tree/master/ARM/Nordic/nRF52/nRF52832/exemples/BlueIOThingy

Driver source

https://github.com/IOsonata/IOsonata/blob/master/src/sensors/agm_invn_icm20948.cpp

https://github.com/IOsonata/IOsonata/tree/master/src/imu

Blog how to setup the Eclipse based development environmental to use the library

http://embeddedsoftdev.blogspot.com/p/ehal-nrf51.html

[Coppers Copernicus]

Dear Nguyen, 

Thanks a million. But I have small questions. Please shed some light.

1. I have a customized board where nRF52480 has to read ICM on burst read mode, as in I need the data fast enough for doing gestures. Is it possible with these drivers?

2. I have to configure a double tap so that the ICM will wake up and start sending the IMU data to the nRF52480. How could i do this?

3. The files you have posted here are all seem to be .cpp format. I am using IAR embedded workbench to flash the code where it uses only .c files. How do I make use of your files for my application. 

Kindly make some time to educate me. Thanks in advance :)

[Nguyen Hoan Hoang]

1. Yes, both SPI & I2C drivers support burst mode.  That is how it can upload the DMP firmware into the ICM chip

2. The code provide you the driver and ground work to access the chip with the basic set of algo provided by Invensense DMP.  For more specialized algo, you'll need to dig in and implement them. The design is object oriented.  There are 2 parts the agm_invn_... is the the raw sensor object and the imu_invn_... is the DMP algo you can add the double tap algo into that or implement your own specialized imu object.  There isn't much docs about the DMP side of the ICM chip.  You'll need to look into invensense example code to figure it out.  

3.  I haven't used IAR.  I think it normally should be able to compile C++ code.  Just try to add a .cpp with a dummy function to see how it compiles.