Error setting sampling frequency on lsm6dso - nrf52833

[ReginaA101]

Hi all,

I am running the lsm6dso zephyr sample on my nrf52833 dev kit. I am unable to set the sampling frequency. I get this error after flashing:

This is my overlay file:

My SDK version is 2.7 and I am on Zephyr 3.6.99

My debugger suggests that the issue could be from this case failing in i2c_nrfx_twim.c

However, the IMU address is listed at 7 bits long in the datasheet.

Does anyone have any suggestions?

[Håkon Alseth]

Hi,

 

Try setting "accel-odr" member:

https://github.com/nrfconnect/sdk-zephyr/blob/v3.7.99-ncs1/dts/bindings/sensor/st,lsm6dso-common.yaml#L17

 

Also, I would recommend that you run on 100 kHz first, as 400 kHz requires stronger pull resistors (ie. external pull present).

 

Kind regards,

Håkon

[ReginaA101]

Also, I get an error code -22 whenever I try to set the sampling frequency for the LSM6DSO

[Håkon Alseth]

Hi,

 

There will be a initialisation of the sensor performed in the startup of the firmware. Could you scope the pins as previously described?

Håkon Alseth said:

set a trigger on falling edge on the SCK pin, and press the reset button on your device.

 

ReginaA101 said:

is there anything else I am supposed to add in order to start transactions? Like are there any other functions that need to be called?

Are you running this example?

https://docs.zephyrproject.org/latest/samples/sensor/lsm6dso/README.html

https://github.com/zephyrproject-rtos/zephyr/blob/main/samples/sensor/lsm6dso/src/main.c

 

If so, it will either set it up in polling or trigger mode based on your device tree setup.

 

Kind regards,

Håkon

[ReginaA101]

Yes i am running that example.

This is the scope 

However, when building the project with this device tree

I get this warning:

I assume this means that lsm6dso has to be enabled in the device tree. But it seems like i marked it as a compatible so it should be fine. Are there any ideas? 

[Håkon Alseth]

Hi,

 

Q1: Can you please share the full build output?

Q2: Can you share the overlay as a file? The warning that you attached indicate that the overlay is not picked up by the build-system.

 

Kind regards,

Håkon

[ReginaA101]

That was the build output

The overlay file is here:

0636.nrf52833dk_nrf52833.overlay

[Håkon Alseth]

Hi,

 

I tested this on my system, as well as a colleague of mines setup, and we are not able to reproduce the line "warning: LSM6DSO was assigned the value 'y', but got the value 'n'", which is effectively not including the driver into your build.

 

Can you delete your build-folder and regenerate the build?

Your overlay, when matching your board, will be automatically appended, so your build in vscode shall look like this:

 

Kind regards,

Håkon

[ReginaA101]

Is there any other configs you need besides config_lsm6dso and config_i2c?

[Håkon Alseth]

The sample is unchanged, just added your file to the folder-structure.

 

Kind regards,

Håkon

[ReginaA101]

I redid my build, and the config error went away. Thanks for that

However I am still unable to communicate with my sensor.

This is my scoping of the SDA and SCL pins. The pins sit at high, then when I restart the board thats when both the pins go low, then they sit at high continuously. 

I am using the same sample https://github.com/zephyrproject-rtos/zephyr/tree/main/samples/sensor/lsm6dso I just changed one line in main due to getting a "device not ready" error:

This is my proj.conf file:

And the overlay file is the same one I sent a couple days ago

This is the sensor board I have

https://www.st.com/en/evaluation-tools/steval-mki217v1.html

Is there any possible configurations I could be missing to enable i2c communication? I have verified the connection of SDA/SCL/VDD and GND pins.

Thanks for your time