Which macro to get sck, mosi and miso pin on spi master

[ngbe]

Hello,

I works with Zephyr, VCS, SDK 2.0.0

I don't find how to get pin number from the DTS pinctrl .

In this folowing code, I want to replace magic number (uplighted in yellow) by macro to acces data of the DTS 

Thank's by advance for your help,

    nrfx_spim_config_t spim_config = NRFX_SPIM_DEFAULT_CONFIG(NRFX_SPIM_PIN_NOT_USED,NRFX_SPIM_PIN_NOT_USED,NRFX_SPIM_PIN_NOT_USED,NRFX_SPIM_PIN_NOT_USED/*NRF_DT_GPIOS_TO_PSEL(SPIM_NODE, cs_gpios)*/);

    spim_config.sck_pin=6+32*1;

    spim_config.mosi_pin=7+32*1;

    spim_config.miso_pin=17+32*0;

    spim_config.frequency = NRF_SPIM_FREQ_1M;

    spim_config.skip_gpio_cfg = true;

    spim_config.skip_psel_cfg = false;

    nrfx_spim_init(&spi_rfid_instance, &spim_config, spi_rfid_handler, NULL);

And my DTS are

&spi1 {

    compatible = "nordic,nrf-spim";

    status = "okay";

    pinctrl-0 = <&spi1_default>;

    pinctrl-1 = <&spi1_sleep>;

    pinctrl-names = "default", "sleep";

    //cs-gpios = <&gpio0 27 GPIO_ACTIVE_LOW>;

};

    spi1_default: spi1_default {

        group1 {

            psels = <NRF_PSEL(SPIM_SCK, 1, 6)>,

                <NRF_PSEL(SPIM_MOSI, 1, 7)>,

                <NRF_PSEL(SPIM_MISO, 0, 17)>;

        };

    };

    spi1_sleep: spi1_sleep {

        group1 {

            psels = <NRF_PSEL(SPIM_SCK, 1, 6)>,

                <NRF_PSEL(SPIM_MOSI, 1, 7)>,

                <NRF_PSEL(SPIM_MISO, 0, 17)>;

            low-power-enable;

        };

    };

[Simon]

Update 30.06.2022: Added strikethrough to an incorrect statement.

I would recommend you to use the Zephyr API. Then the information specified in DTS will automatically get picked up by the SPI drivers without you needing to do anything. It is also much less complicated to use.

However, you might have chosen to use the nrfx drivers for a specific reason, but I thought it would be nice to inform you in case you weren't aware.

To answer your question, you could take a look at the file spi_nrfx_spim.c to see how to get the pin number from the DTS pinctrl (use DT_PROP_OR or DT_PROP macros)

https://github.com/nrfconnect/sdk-zephyr/blob/v3.0.99-ncs1/drivers/spi/spi_nrfx_spim.c#L487-L488

https://github.com/nrfconnect/sdk-zephyr/blob/v3.0.99-ncs1/drivers/spi/spi_nrfx_spim.c#L511-L515

https://github.com/nrfconnect/sdk-zephyr/blob/v3.0.99-ncs1/drivers/spi/spi_nrfx_spim.c#L510

Best regards,

Simon

[ngbe]

Hello Simon,

Thank you for your reply,
I took your advice and it is all right with Zephyr API.

Note that I have to add following properties in "zephyr/dts/bindings/spi/nordic,nrf-spim.yaml"

   spi-max-frequency:
      type: int
      required: false
      default: 4000000
      description: Maximum clock frequency of device's SPI interface in Hz

    duplex:
      type: int
      default: 0
      required: false
      description: |
        Duplex mode, full or half. By default it's always full duplex thus 0
        as this is, by far, the most common mode.
        Use the macros not the actual enum value, here is the concordance
        list (see dt-bindings/spi/spi.h)
          0    SPI_FULL_DUPLEX
          2048 SPI_HALF_DUPLEX
      enum:
        - 0
        - 2048

    frame-format:
      type: int
      default: 0
      required: false
      description: |
        Motorola or TI frame format. By default it's always Motorola's,
        thus 0 as this is, by far, the most common format.
        Use the macros not the actual enum value, here is the concordance
        list (see dt-bindings/spi/spi.h)
          0     SPI_FRAME_FORMAT_MOTOROLA
          32768 SPI_FRAME_FORMAT_TI
      enum:
        - 0
        - 32768

WIthout that , SPI_CONFIG_DT fail .

struct spi_dt_spec	spi_rfid={ 
	.bus=DEVICE_DT_GET(SPI_RFID_NODE), 
	.config=SPI_CONFIG_DT(SPI_RFID_NODE,SPI_OP_MODE_MASTER | SPI_WORD_SET(8) | SPI_MODE_CPHA | SPI_MODE_CPOL,0),
};

Regards,

Stéphane