Unable to Read Temperature values from STS40-CD1B-R3 Sensor in peripheral_ht Sample

[venkatesh@ivativ]

Hi Team,

Hello Team,

I'm currently working on integrating the Sensirion STS40-CD1B-R3 temperature sensor into the peripheral_ht . To do this, I pulled the STS40 driver code from the official Sensirion GitHub(GitHub - Sensirion/embedded-i2c-sts4x: Embedded driver for Sensirions STS4x temperature sensor) repository and integrated it into the sample.

However, I'm unable to retrieve valid temperature readings from the sensor.

from the board schematic, pull-ups are present at SDA and SCL lines of nrf52840 MCU.

Attached the project folder below.
peripheral_ht_STS40.zip

could you please help me, where I'm going wrong?
Best Regards,
Venkatesh K.

[venkatesh@ivativ]

in the debug log, i didn't get any instead boot-up messages

[Vidar Berg]

Hi,

Does this mean you are not seeing any log messages from main()? Are you looking at the logs from RTT or UART? I can see logging over UART is disabled in the version you sent me at least. 

Best regards,

Vidar

[venkatesh@ivativ]

Hi Vidar, 

I enabled RTT logs in prj.conf. so i was looking at RTT and it is not printing instead of boot-up messages.

Best Regards,
Venkatesh

[Vidar Berg]

Hi Venkatesh,

Did RTT logging stopped working at some point, or has it never worked with this project? Are you able to get RTT logs when using the SDK samples? And are you able to do any debugging to check if the program even reaches main()?

[venkatesh@ivativ]

Hi,
RTT loggings and UART are working in other projects. but in this project only i was not getting logs to debug.



BR,
Venkatesh K.

[Vidar Berg]

Hi,

sensirion_i2c_hal_write() is being called before sensirion_i2c_hal_init() which causes the device 'i2c_dev' pointer to be passed to i2c_write before it has been initialized. 

Best regards,

Vidar

[venkatesh@ivativ]

Hi Vidar,

I’m glad you just solved my issue. You absolutely ACE’d it!
Thanks for your help—I’m getting correct temperature readings now.



Best Regards,
Venkatesh.