SPI Pins in nrf9160dk_nrf9160_common.dts

[Canastra]

Hi

in Zephir nrf9160dk_nrf9160_common.dts the SPI pins are defined

&spi3 {
compatible = "nordic,nrf-spim";
status = "okay";
sck-pin = <19>;
mosi-pin = <18>;
miso-pin = <17>;
};

But in the scematic of nRF9160DK an SPI is defined on following PINs.

P0.11 MOSI

P0.12 MISO

P0.13 SCK

Is there a reason to define useless pins?

RetoFelix

[Albrecht Markus Schellenberger]

Hello RetoFelix,

Yes, they are labeled with SPI pins because the external memory controller is using an SPI interface.

The nRF9160 has four SPI peripherals, and you can easily assign the pins P0.11, 12 and 13 to any of them by using a devicetree overlay file.

However, we have chosen to assign the pins P0.17, 18 and 19 to SPI3 to make it as easy as possible for our customers getting started with the nRF9160 peripherals. And since those pins are exposed on the nRF9160 DK, I can’t see any mismatch here.

Regards,

Markus