Which pins are suitable for using SPI and Uart in nRF9160DK

[Parth Sagar]

I am using nRF9160Dk and I am facing some issues in configuring the SPI and uart.

I am able to get my UART working properly with the following pins

&uart1 {
compatible = "nordic,nrf-uarte";
current-speed = <115200>;
status = "okay";
tx-pin = <10>;
rx-pin = <11>;
rts-pin = <0xFFFFFFFF>;
cts-pin = <0xFFFFFFFF>;
};

Even the SPI works fine with the following pins

&spi3 {
//compatible = "nordic,nrf-spim";
status = "okay";
sck-pin = <10>;
mosi-pin = <11>; 
miso-pin = <12>; 
cs-gpios = <&gpio0 13 0>; 
//int1-gpios = <&gpio0 2 0>;
sdhc0: sdhc@0 {
compatible = "zephyr,mmc-spi-slot";
reg = <0>;
status = "okay";
label = "SDHC0";
//spi-max-frequency = <24000000>;
spi-max-frequency = <12000000>;
//int1-gpios = <&gpio0 2 0>;

};
};

Since my 10 and 11 pins are overlapped I need different pin number to make both of them work at the same time, but unfortunately, with any other pin assignments, my example doesnot work. I did not find any documentation on which pins should I use for SPI/Uart.

If anyone can help me with this, it would be great

[Simon]

The nrf52840 on the nRF9160 DK act as a board controller and will route the GPIO pins as seen here. In order to change how the GPIO pins of the nRF9160 are routed, you have to add configurations from https://github.com/nrfconnect/sdk-zephyr/blob/master/boards/arm/nrf9160dk_nrf52840/Kconfig to the prj.conf of e.g. the hello_world sample and program it to the nrf9160dk_nrf52840 board.

Take a look at this case, which explains this in more depth.

Best regards,

Simon