RE: Thingy91 Two UART Connections

Albrecht Markus Schellenberger — Tue, 29 Jun 2021 06:34:21 GMT

Hello Joe,

[quote user=""]It appears that the first (UART0) is running at 115200 baud and the second (UART1) is running at 1000000 baud[/quote]

Yes, that is correct! But the baud-rates can of course be modified via a devicetree overlay.

In general, UART0 is used for console logging while UART1 is used for modem tracing on the nRF9160 side. But as you can see on the Thingy:91 pin map, the UART0/UART1 pins (P0.18 - P0.25) are considered as MCU_IF for communication with the nRF52840 as well.

For more information, you can download the Thingy:91 hardware files and check the file ../PCA20035-Thingy91 Board 1_6_0/Schematic_Layout pdf files/ PCA20035_Schematic_And_PCB.pdf.

[quote user=""]Is it advisable to use only a single UART between the nRF9160 and the nRF5280 in order to free up a UART for other uses?[/quote]

In general, peripherals are shared via memory instantiation, which makes it dependent on the design and purpose of your application. But you can of course use all the UART peripherals available.

I hope this will help you! Let me know if you have any more questions.

Regards,

Markus