LSM6DS33 to work with LSM6DSO driver

[Mads Fidder]

Hello Nordic team and fellow developers,

I am working on an adafruit nrf52840 feather sense board, for which i have created a custom DTS file.

I am trying to interface with all the onboard sensors, which one of them is the LSM6DS33. I have noticed there is already a driver in the SDK for the LSM6DSO, which i very similar.

One thing that is not compatible with the existing driver, is the chip id. 

When i set CONFIG_LSMDSO=y for enabling the driver located in \v1.9.1\zephyr\drivers\sensor\lsm6dso, the function: lsm6dso_init_chip() gets called.

This function checks the chip id, which needs to be changed. I am talking about changing:

#define LSM6DSO_ID 0x69 line 173 in \v1.9.1\modules\hal\st\sensor\stmemsc\lsm6dso_STdC\driver\lsd6dso_reg.h

So my question is:

How can i modify the config or use the driver, without altering the SDK and still use the driver with the sensor api?

Thanks in advance

/Mads

 

[Håkon Alseth]

Hi,

 

It is not really an easy way to do this if you do not want to fork/edit the sources.

Based on the _ID define, are you sure its not this one you're interested in?

https://github.com/zephyrproject-rtos/hal_st/blob/master/sensor/stmemsc/lsm6ds3_STdC/driver/lsm6ds3_reg.h#L172

 

Kind regards,

Håkon

[Mads Fidder]

Thank you for the answer,

It very well may be the driver that i am looking for. However, how exactly am i supposed to interface with it? 

More exactly, what am i supposed to do in prj.conf and in the .dts file?

Again, thanks in advance

/Mads

[Håkon Alseth]

Hi,

 

I see what the problem is, and sorry for not spotting this earlier.

zephyr does not have a sensor API port for the lsm6ds3:

https://github.com/nrfconnect/sdk-zephyr/tree/v3.0.99-ncs1-rc1/drivers/sensor

 

I'm not sure there's any easy way other than manually interfacing the sensor via the nrfx_twi/twim driver directly.

 

Kind regards,

Håkon

[Mads Fidder]

Thanks you for your help so far. 

It seems wierd to me that there is a fully fletched driver in the sdk, the one you mentioned:

https://github.com/zephyrproject-rtos/hal_st/blob/master/sensor/stmemsc/lsm6ds3_STdC/driver/lsm6ds3_reg.h

But with no obvious way to interface with it? Can you elaborate on that.

Furthermore, you said that there is no easy way, is there a hard way? ;)

Best regards, Mads

[Håkon Alseth]

Hi Mads,

 

I would recommend interfacing the sensor directly using the nrfx_twim driver.

In addition, you could raise an issue on zephyr's github:

https://github.com/zephyrproject-rtos/zephyr/issues

 

Kind regards,

Håkon