nrf52832 use specific pin assignment can cause twi function not working

[Cooper]

Hi

I found a strange issue on nrf52832. And I use nRF5-SDK-v13.1.0.

When I assignment P0.7->SCL & P0.6->SDA, the twi function not working. But I change the assignment to P0.6->SCL & P0.7->SDA, it works fine.

There has a same issue on the other post. https://devzone.nordicsemi.com/question/131232/twi-scl-and-sda-pins-7-and-6-not-working-on-nrf52/

And I also try P0.8->SCL & P0.6->SDA, the twi function not working too.

Is it a nrf52832 design defect?

If can, somebody can check this setting to help me confirm the issue?

[Cooper]

After I check the program initial procedure. I found P0.6 is assigned to UART TX in the "log_init()". And "log_init()" is before my twi initial procedure.

And I delete the "log_init()", and the twi work normal.

This is my fault. I forgot comment "log_init()".

[endnode]

Does the video show failing case? Are these glitches when SCL goes LOW the cause on receiver side or are these valid clock-stratching situations to hold incoming data? Other than that you can still have problem with digital values and shape of LOW-HIGH slope of your signals, they seems to have some delay to reach 3V3 (or whatever is HIGH limit) and that can cause problems on receiver's side...