SPI for waveshare display module alongside uart peripheral

RE: SPI for waveshare display module alongside uart peripheral

jasansingh — Mon, 13 Oct 2025 19:34:47 GMT

I am using the uart straight out of peripheral uart sample, which is uaing uart20 and the spi block I using is spi00

/ {

chosen {

nordic,nus-uart = &uart20;

};

#include "../common/common-pinctrl.dtsi"

&spi00 {

status = "okay";

compatible = "nordic,nrf-spis";

pinctrl-0 = <&spi_slave_dummy>;

pinctrl-names = "default";

def-char = <0x44>;

/delete-property/ pinctrl-1;

/delete-property/ rx-delay-supported;

/delete-property/ rx-delay;

};

&spi30 {

status = "okay";

compatible = "nordic,nrf-spis";

pinctrl-0 = <&spi_slave_dummy>;

pinctrl-names = "default";

def-char = <0x33>;

/delete-property/ rx-delay-supported;

/delete-property/ rx-delay;

};

RE: SPI for waveshare display module alongside uart peripheral

Susheel Nuguru — Mon, 13 Oct 2025 19:19:01 GMT

Jason,

When you have a peripheral that shares the same ID, like UART00 and SPIS00, then they cannot be used at the same time as they share the resources on the chip. This is documented here.

If you want to use UART and SPI together make sure you use UARTXX and SPISYY and XX≠YY then you can use both at the same time.

Since you want to use logs that use UART00, then make sure not to use any other serial instance like TWIM00, TWIS00, SPIS00 and SPIM00. Use any other available instance of the peripheral.

RE: SPI for waveshare display module alongside uart peripheral

jasansingh — Mon, 13 Oct 2025 19:07:57 GMT

Hi Susheel

Thanks for looking into this, I do not see the conflict after disabling UART, But I want to keep the uart functionality and add the display interface along with the existing code.

Do you know how can I make this possible

Thanks again
Jasan Singh

RE: SPI for waveshare display module alongside uart peripheral

Susheel Nuguru — Mon, 13 Oct 2025 18:50:44 GMT

Hi,

If you are using serial logs using UART then it is possible that you also have UART00 enabled for those logs and that conflicts with your SPIS00 use. Try disabling the logs and see if the conflict goes away.

You can add the below in your project overlay file

&uart00 {
	status = "disabled";
};

And the below in prj.conf

CONFIG_LOG=n
CONFIG_SERIAL=n