RE: nRF9160 DK UART configuration

Martin Lesund — Fri, 24 May 2019 09:01:20 GMT

Hi Erik,

For most of the nrf91 applications, the default software settings for UART0 and UART1 are that they are routed to VCOM0 and VCOM2 respectively.

The UART0 is the "primary" UART which you get the console data as well as the data from the AT host library if you have that enabled.

The UART1 can be used for modem tracing when you have enabled the BSD_LIBRARY_TRACE_ENABLED config.

CONFIG_BSD_LIBRARY_TRACE_ENABLED=y

That feature is used in combination with the "Trace collector" application in "nRF Connect for Desktop" as described here.

If you want to route UART0 or UART1 to the external pins for the nRF91 DK you can follow the instructions in this thread.

The LTE Sensor Gateway Sample is programmed to use the UART2 from the nRF91 to communicate with the nRF52 to send data.

That's why you can see that UART2 has been enabled in that sample.

For your last question, that should be sufficient to turn of Flow control for the chosen UART.

Best Regards,

Martin L.