nrf9160 custom board - connect UART and send AT commands

[john_b]

I am working on a custom board with the nRF9160 SiP. It comes with pre-programmed modem firmware. Header pins for UART1 and UART2 are provided on the custom board. Is it possible to connect directly to the UART and send AT commands? Or do I need to program the nRF9160 with a sample application using nRF9160 DK or jlink programmer first?

Thanks in advance

[Håkon Alseth]

Hi,

 

 

Is it possible to connect directly to the UART and send AT commands? Or do I need to program the nRF9160 with a sample application using nRF9160 DK or jlink programmer first?

 You will need to flash this sample to your board:

https://github.com/NordicPlayground/fw-nrfconnect-nrf/tree/master/samples/nrf9160/at_client

 

at_client uses UART0, so if this differs from the nRF9160-DK pin output, you need to change the pin out to match yours.

This is done by creating a at_client/nrf9160_pca10090ns.overlay file containing this:

&uart0 {
	status = "okay";
	tx-pin = <10>;
	rx-pin = <11>;
	rts-pin = <0xFFFFFFFF>;
	cts-pin = <0xFFFFFFFF>;
};

 

And copying this one for the secure region as well, located in ncs/nrf/samples/nrf9160/spm/nrf9160_pca10090.overlay (note the lack of ns prefix).

 

Kind regards,

Håkon

[john_b]

My apologies for the late response, Hakan. I have flashed the at client sample to the nRF9160 custom board after creating the at_client/nrf9160_pca10090ns.overlay as you suggested and it works well.

Thanks a lot for your support. Please close this ticket.

Kind Regards,

John