INVENSENSE ICM-20948

RE: INVENSENSE ICM-20948

TTN — Thu, 17 Jun 2021 09:26:21 GMT

Hi, I'm trying to use icm 20948 with nrf52 by spi.

I read the file in the eMD-SmartMotion-ICM20948-1.1.0-MP

but the example is for others system not for nrf, so i am too new to hook it up.

Do you have some experice to share?

What kind of protocal do you use to control icm20948, it seems you didn't use spi?

Thanks.

RE: INVENSENSE ICM-20948

SamirFarhat — Wed, 25 Nov 2020 14:24:22 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: INVENSENSE ICM-20948

Nguyen Hoan Hoang — Sun, 10 Feb 2019 21:14:03 GMT

Better driver here that works both SPI & I2C. https://github.com/IOsonata/IOsonata/blob/master/src/sensors/agm_invn_icm20948.cpp

The ICM-20948 is completely different from the MPU-9250. MPU-9250 driver cannot be used for the ICM-20948.

RE: INVENSENSE ICM-20948

Jørgen Holmefjord — Mon, 10 Dec 2018 09:27:36 GMT

If your question is related to the sensor, please direct your question to the manufacturer. If you have a question related to code on nRF for reading the sensor data with SPI, please post a new question where you described your issue and setup.

RE: INVENSENSE ICM-20948

Aiden.shen — Mon, 10 Dec 2018 09:13:40 GMT

Hi，I did not find that magnetometer can not work on SPI,Where you found the result,Could you told me?Because I was designing the ICM20948 by SPI now.

RE: INVENSENSE ICM-20948

vohra alihussain — Mon, 23 Jul 2018 13:48:28 GMT

thank you Jorgen

i have gone through datasheet of manufacturer, to use the magnetometer i have to use I2c

RE: INVENSENSE ICM-20948

Jørgen Holmefjord — Mon, 23 Jul 2018 12:10:15 GMT

Hi,

Have you seen these libraries, which are written for the MPU9255 (similar to ICM-20948)?

You will have to ask the chip manufacturer about details on what modes the chip will work in.

Best regards,
Jørgen