Using 2 devices on the same SPI

Question

Hello, I am currently working with NRF5340-DK dev kit and I want to use 2 SPI devices connected on the same SPI bus OR use 2 different SPI instances, however none of these 2 approaches is working. This is my overlay file when trying to use the same SPI bus for two devices:

&spi4 {
    status = "okay";
    pinctrl-names = "default";
    pinctrl-0 = <&spi4_default>;

    cs-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>,  
               <&gpio1 10 GPIO_ACTIVE_LOW>;  
   
    canbus0:mcp2515@0 {
		compatible = "microchip,mcp2515";
		spi-max-frequency = <1000000>;
		int-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>; 
		status = "okay";
        sample-point = <750>;
		reg = <0x0>;
		osc-freq = <20000000>;
		bus-speed = <500000>;
		#address-cells = <1>;
		#size-cells = <0>;
	};

    canbus1: mcp2515@1 {
        compatible = "microchip,mcp2515";
        spi-max-frequency = <1000000>;
        int-gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
        status = "okay";
        sample-point = <750>;
        reg = <0x1>;
        osc-freq = <20000000>;
        bus-speed = <500000>;
        #address-cells = <1>;
        #size-cells = <0>;
    };
};

When I try to compile I get this:
devicetree error: pinctrl-names property in /soc/peripheral@50000000/spi@a000 in /home/portilha/ncs/v2.6.99-cs2/zephyr/misc/empty_file.c has 1 strings, expected 2 strings

The other approach was to use SPI4 and SPI3. For SPI4 its all good, however when I try to use the SPI3 pins that I've defined it does not work properly. Is there any problem with the chosen pins? They don´t conflict with any other in use peripheral:

&spi3 {
    status = "okay";
    cs-gpios = <&gpio1 12 GPIO_ACTIVE_LOW>;
    pinctrl-0 = <&spi3_default>;
    pinctrl-names = "default";
   
    canbus: mcp2515@0 {
        compatible = "microchip,mcp2515";
        spi-max-frequency = <1000000>;
        int-gpios = <&gpio1 6 GPIO_ACTIVE_LOW>;
        status = "okay";
        sample-point = <750>;
        reg = <0x0>;
        osc-freq = <20000000>;
        bus-speed = <500000>;
        #address-cells = <1>;
        #size-cells = <0>;
    };
};


&pinctrl {
    spi4_default: spi4_default {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 1, 15)>,
                    <NRF_PSEL(SPIM_MOSI, 1, 13)>,
                    <NRF_PSEL(SPIM_MISO, 1, 14)>;
        };
    };

    spi3_default: spi3_default {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 0, 27)>,
                    <NRF_PSEL(SPIM_MOSI, 0, 10)>,
                    <NRF_PSEL(SPIM_MISO, 0, 2)>;
        };
    };
};

Can anybody help?
BR

runsiv · Accepted Answer

Hi

I suspect you are missing a group in pinctrl

try to add sleep group as below, and add the group to pinctrl-names so that it would be pinctrl-names = "default", "sleep";

  spi3_sleep: spi3_sleep {
        group1 {
            psels = <NRF_PSEL(SPIM_SCK, 0, 27)>,
                    <NRF_PSEL(SPIM_MOSI, 0, 10)>,
                    <NRF_PSEL(SPIM_MISO, 0, 2)>;
        };
    };

and delete the spi4 group that is not in use.

This is for using 1 SPI peripheral

Regards

Runar

Using 2 devices on the same SPI

Top Replies