RE: Unreliable Uarte between the nRF9160DK and the nRF52840DK

Vidar Berg — Tue, 21 Dec 2021 14:13:06 GMT

Hello,

Please verify that you have the same IO voltage on both sides of the connection. The IO voltage on the 9160DK is 1.8v by default (see VDD supply rail for changing the IO voltage) whereas the nRF52840 DK has 3 volts when supplied through the main USB port. I would expect the communication to be unreliable at best if the voltages don't match.

The pins you have selected should be available by default according to the nRF9160 DK board control table.

Best regards,

Vidar

RE: Unreliable Uarte between the nRF9160DK and the nRF52840DK

Christopher Hunt — Tue, 21 Dec 2021 06:51:48 GMT

Just to add: I've used a logic analyser to verify that bits are being tx and rx. Every now and again, the tx from the nRF9160DK client lasts about 3000ms instead of 3ms. I don't know if this helps or not.