nRF52480 I2C Interface with Invensense ICM 20948

RE: nRF52480 I2C Interface with Invensense ICM 20948

awneil — Fri, 06 Mar 2020 09:11:08 GMT

Again, that has nothing to do with Nordic or the nRF52 - that is purely a question for Invensense.

RE: nRF52480 I2C Interface with Invensense ICM 20948

NIDHIN K — Fri, 06 Mar 2020 04:33:05 GMT

Dear Coppers,

Have you found how to configure double tap in icm20948 ? I am also stuck on that. Can you help me that if u found any solution .

RE: nRF52480 I2C Interface with Invensense ICM 20948

Nguyen Hoan Hoang — Fri, 26 Apr 2019 11:33:52 GMT

You can find more example code here https://github.com/IOsonata/IOsonata/tree/master/exemples

RE: nRF52480 I2C Interface with Invensense ICM 20948

nikhilesh — Fri, 26 Apr 2019 08:44:53 GMT

Hello Nguyen,

Could you please guide me through how to use the drivers you provided for the nrf52840 twi <--> i2c ICM 20948 configuration and output? any sample code or just a function to access please?

RE: nRF52480 I2C Interface with Invensense ICM 20948

Nguyen Hoan Hoang — Tue, 09 Apr 2019 09:47:00 GMT

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.

RE: nRF52480 I2C Interface with Invensense ICM 20948

Coppers Copernicus — Tue, 09 Apr 2019 08:19:40 GMT

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 :)

RE: nRF52480 I2C Interface with Invensense ICM 20948

Nguyen Hoan Hoang — Thu, 28 Mar 2019 00:04:53 GMT

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

RE: nRF52480 I2C Interface with Invensense ICM 20948

awneil — Thu, 21 Mar 2019 17:14:32 GMT

As far as the nRF52840 is concerned, they are both just I2C slaves. The nRF52840 fully supports communication with I2C slaves.

[quote userid="78277" url="~/f/nordic-q-a/45205/nrf52480-i2c-interface-with-invensense-icm-20948"]Kindly provide some Kind of source to generate a double tap Interrupt and start getting the Acc, Gyr, Mag[/quote]

Don't Invensense provide that?

Apart from normal internet search engines, a good way for specifically finding source code is a search on GitHub ...