nRF91 with CCS811 issue

[mschweig]

Hi!

I am trying to interface the CCS811 with the nRF91-DK. For this purpose I am using nrf-sdk 1.6.0 and "ccs811" sample from zephyr. I created a nrf9160dk_nrf9160ns.overlay in the "boards" folder and enabled the I2C and CCS811 in prj.conf. Also I tried both adresses, 5a and 5b. 

I properly connected the sensor to the board. However, I am getting "failed to get device binding". I ensured that the sensor is working and tested it with an arduino. 

Has someone managed to communicate with the CCS811 with the nRF91? 

I appreciate your help. 

Thanks. 

[Simon]

• Check the file ccs811/build/zephyr/zephyr.dts to see if everything from the overlay file is included. Search for "CCS811".
• Debug the init function ccs811_init(), and see if it runs successfully. If that function fails, the call to device_get_binding() will fail as well

Best regards,

Simon

[mschweig]

Hi Simon, I already checked zephyr.dts. i2c and ccs811 is properly included.

I debugged ccs811_init() and it fails at resetting the sensor.

<err> i2c_nrfx_twim: Error 0x0BAE0001 occurred for message 0
[00:00:00.228,179] <err> CCS811: Failed to read Status register

Kind regards, 
Manuel 

[Simon]

I googled the error message "Error 0x0BAE0001 occurred for message 0" and found this https://devzone.nordicsemi.com/f/nordic-q-a/75770/i2c_nrfx_twi-error-0x0bae0001-occurred-for-message-0. 

Could you check that the address used is correct?

[mschweig]

Hi, I also saw that and double checked the address. I have the one with 5A. 

Kind regards, 

Manuel

[Simon]

Do you have a logic analyzer? Try connecting it to the SDA and SCL lines to see what's going on, and if the correct address is used.

What happens if you try to read the status register from the Arduino? Try connecting the logic analyzer in that case and see what's going on.

Best regards,

Simon

[mschweig]

Hi Simon, 

I found out, that are some issues of the wake and reset routine of the CCS811 zephyr driver. 

A hotfix was that I added a reset pin to board config overlay but only attached the WAKE pin of the CCS811 to ground. 

With that its working and I am receiving values. I will have a closer look at the issues in the driver in a few days. 

Kind regards, 

Manuel

[Simon]

If there is a bug with the driver, you can create an issue here: https://github.com/zephyrproject-rtos/zephyr/issues/new/choose.

It would be nice if you could link to the issue in this ticket.