I2C

[Himanshu_flexe]

Title: Issue with I2C (TWI) Communication on nRF52840 (SDK 16, Segger 8.2a)

Description:

I am working with the nRF52840 using nRF SDK 16 in Segger Embedded Studio 8.2a. As I am new to the SDK, I started with an I2C (TWI) scanner code to detect my sensor (HTU with address 0x40). However, I am facing an issue where no devices are detected.

Observations & Debugging Attempts:

Hardware Setup:

I am using P0.26 for SDA and P0.27 for SCL.

I have verified the connections, and the sensor is powered correctly.

Oscilloscope Observations:

When probing the SDA and SCL lines, both remain at 3.3V (high state).

There is no clock signal on the SCL line, meaning communication is not being initiated.

Software Modifications & Issues:

Initially, I encountered an error related to vprintf, which was resolved by removing the related file.

The program now compiles and flashes successfully, but no devices are detected during scanning.

Questions:

Why is the SCL line not toggling?

Do I need to configure any additional settings in sdk_config.h or modify my TWI initialization?

Are external pull-up resistors required on the SDA and SCL lines for proper operation?

Is there anything else I should check to establish proper I2C communication?

Any guidance on resolving this issue would be greatly appreciated.

[Himanshu_flexe]

Hi, 

thanks for the reply .

i resolve the isssue of SDA and scl not toggling  ,  i am using nrf52840 DK , it  was the issue in my code now i m am usimng P0.27  and P90.26 for SCL and SDA but stiil it is not able to detect  my htdu sensor  whose adress is 0X40 .
As suggested by you i will switch to nrf connect sdk , can you tell me or share me resources how to learn it efectively beacuse it take lot of time to me understnd it and sometime i get overwhelmed with the tyhing not working 

[Einar Thorsrud]

Hi,

I am glad to hear you resolved the first issue. When switching to the nRF Connect SDK I recommend going through the nRF Connect SDK Fundamentals course. This takes about a day, but will get you started with all the tools and the basic understanding of how to work with the SDK. At a later point, I also recommend going through nRF Connect SDK Intermediate which covers more advanced topics. Other than that, the SDK documentation is quite extensive.