I2C not working in nRF54L15DK

[Raja Reddy]

Hi,

We developed an application on the nRF52833 and are now porting it to the nRF54L15. As part of this process, I'm integrating an external RTC via I2C on the nRF54L15DK. After modifying the overlay file accordingly, the i2c write operation returns a -5 error (input/output error). What could be the possible cause?

Note: The application was working on the nRF52833.

moreover CONFIG_I2C is enabled in "prj.cfg" file.

[Charlie]

Hi Raja,

Thanks for reaching out with your questions. I have two suggestions for your debugging process:

1. This seems similar to a previous ticket. Could you refer to the solution mentioned here:
   Nordic DevZone - I2C device_is_ready failed with init_res -5

2. Try using a logic analyzer to compare the I2C communication between the two applications to identify any differences.

Let me know if you need further assistance!

Best regards,
Charlie

[Raja Reddy]

Hi Charlie,

Thank you for your response regarding the I2C issue.

It's now working perfectly!

[Charlie]

Good to know! You are welcome.

Charlie

[zak_2020]

Which pins did you use then? Thanks in advance.

[ab73291833]

I also encountered this error when trying to use the i2c22 instance. I was using P1.04 for SCL and P1.07 for SDA. My project was working on the nrf5340dk, but I kept seeing the -5 return code when trying to interface with any I2C peripherals on the nrf54l15dk. The fix I found was to switch to the TWIM33 instance, after I did this all my peripherals started working as per normal. To do this you just need to change i2c22 to i2c30 in the overlay file shown above. 

Note that TWIM33 only works on Port 0 as described in the datasheet.

I used P0.03 for SCL (as this is a clock pin) and P0.02 for SDA.