ICM20948 magnetometer issue

RE: ICM20948 magnetometer issue

AYAO — Tue, 21 Jun 2022 03:14:36 GMT

Thank you for sharing your wisdom with me. This really help me a lot！

RE: ICM20948 magnetometer issue

SL06 — Wed, 25 Nov 2020 17:39:14 GMT

Invensense Embeded motion driver make this quite simple. You can look at the Nucleo ICM20948 Emd exemple on their website(developper corner).

RE: ICM20948 magnetometer issue

SamirFarhat — Wed, 25 Nov 2020 14:25:36 GMT

Hi, I know this as asked a while ago, but there is still very little information on how to get the icm20948 magnetometer working in SPI mode. So thought I'd write this to clarify. The magnetometer can be written to and read from in SPI mode. The sequence for this is as follows.

1. Write to the USER_CTRL register, setting I2C_MST_EN

2. Write to I2C_MST_CTRL, setting the bus speed 400KHz and to stop between read

3. Write to I2C_MST_DELAY_CTRL, enabling delay odr for the slave you wish the mag to be represented by(the following instructions will assume 0.

4. Write to I2C_SLV0_ADDR to write mode, and slave address to the magnetometer (0x0C)

5. Write to I2C_SLV0_REG, setting the address to be written as the address of CTRL2 in the magnetometer

6. Populate ICM20948_I2C_SLV0_DO with the desired control setting

7. Write to ICM20948_I2C_SLV0_CTRL, enabling the mag and setting the grouping and bytes to be read

8. Switch I2C_SLV0_ADDR to read mode and I2C_SLV0_REG to HXL

9. EXT_SLV_SENS_DATA_(00 to 06) will now be populated with HXL to ST2. It should be noted that reading ST2 is necessary as this automatically triggers the data to update in the axis registers.

10. Additionally, FIFO_EN_1 can be set to write slv(magnetometer) data to the FIFO

RE: ICM20948 magnetometer issue

Nguyen Hoan Hoang — Tue, 22 Sep 2020 21:45:37 GMT

Driver is available here https://github.com/IOsonata/IOsonata/blob/master/src/sensors/agm_invn_icm20948.cpp

Works with nRFx series.

Usage example here https://github.com/IOsonata/IOsonata/tree/master/exemples/sensor

Example that is compatible with Thingy App. github.com/.../BlueIOThingy

RE: ICM20948 magnetometer issue

ChandraSR K — Tue, 22 Sep 2020 14:43:24 GMT

the below link couldn't access, https://github.com/github-deden/nRF52832_ICM20948_DMP_Samples.

Can you help.

RE: ICM20948 magnetometer issue

Pepam — Wed, 20 May 2020 17:18:33 GMT

Hi,

Many many thanks for help SL06, I am studying the driver now. Magnetometers and all other sensors now working fine. Still have some questions related to fifo data processing and dmp settings to reduce current consumption. Wouldn't you mind, if I contact you by email or something different? It would help me a lot.

Regards

RE: ICM20948 magnetometer issue

SL06 — Sat, 16 May 2020 21:04:43 GMT

If you look on Github web site, you will find an exemple of the ICM20948 working with the nrf52832. https://github.com/github-deden/nRF52832_ICM20948_DMP_Samples Read the issues section to get the magnetometer working properly (small change in the code needed). There is also an improve i2c driver in the issues.

The code is based on Invensense Embedded motion driver. You should download also that code from there web site in the developper section. Download the version for the nucleo board. I have develop softwares for the nrf52832 board and ICM20948, using ESB communication between 7 peripheral and 1 central. Still some testing phase but so far so good. Software just need optimisation but it basically work. Good luck with your project.

RE: ICM20948 magnetometer issue

haakonsh — Tue, 12 May 2020 08:22:40 GMT

[quote user="Pepam"]I am reading from icm's external slave 0 registers I am always getting 0 for all of them.[/quote]

We need to see your code related to reading these registers and we need a digital analyzer scope of the read sequence.

RE: ICM20948 magnetometer issue

Pepam — Mon, 11 May 2020 12:05:06 GMT

That inertial i2c master connection magnetometr --- i2c master (in icm20948 there is a module which offers to connect more external sensors and read their data form icm's registers) is not correct, because I am not able to read valuable data from it. From magnetometers registers I am reading from icm's external slave 0 registers I am always getting 0 for all of them.

RE: ICM20948 magnetometer issue

haakonsh — Mon, 11 May 2020 10:58:56 GMT

I get that it does not work, but what is the actual issue here, what are your symptoms?

RE: ICM20948 magnetometer issue

Pepam — Mon, 11 May 2020 08:38:48 GMT

Yes, sorry for lack of information. I have modified this Arduino driver to twi driver from MartinBL examples for mpu9250 and others. I am attaching my code. I have modified it and added some unnecessary functions just for testing, so some functions are not important. But the arrangement in ICM20948_begin is the same as in Arduino driver. The problem isnt in twi driver i am sure, because data from inetrial accelerometer and gyro i am able to read, but not data from magnetometer. Please see my driver. Using twi driver from MartinBL 's mpu examples modified for icm and for SDK15.2. Working witch segger embedded studio and pca10040.devzone.nordicsemi.com/.../app_5F00_ICM20948.zip

RE: ICM20948 magnetometer issue

haakonsh — Mon, 11 May 2020 08:10:27 GMT

Do you have any information on this issue?