New UART pin configuration issue in nrf52840dk

[pv]

In the datasheet of the nrf52840dk board, for the port P4, there are freely available pins p0.26 and p0.27. If I use those two pins in the overlay file, I am getting "Pin 26 of &gpio0 already assigned to 2 other nodes.
nrf52840dk_nrf52840.dts(182, 14):   Overlapping assignment," if it is freely available, then also I am not able to use it to configure the new UART, then how can I configure the  new UART and now I am getting doubts whether I can configure the new UART or not.

[AHaug]

Hi,

In  Issue with the new UART configuration in zephyr RTOS for nrf52840dk I explained that you could use any other GPIO that were aviailable that had not any gray text beside it. I believe this might've mislead you in selecting P0.26 and P0.27. If you flip your DK you can see that these are set up for SCL and SDA. Please try with for instance P0.28, P0.29 or P0.30. These should not give you the error message you're seeing.

Kind regards,
Andreas

[pv]

For this P0.28 and P0.29 also I am facing the same issue,where Tx pin is working and rx pin is not working,not able to receive anything.If I reset the board then at that time the light in the rx pin is getting flashed

[AHaug]

pv said:

For this P0.28 and P0.29 also I am facing the same issue,where Tx pin is working and rx pin is not working,not able to receive anything.I

Are you certain you're sending anything?

Please provide a minimal sample and I'll have a look.

Kind regards,
Andreas

[pv]

Yes I am sending 20bytes or less than 20bytes of data.