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;

        };

    };

[Tristen]

To answer your original question (for cases like mine where I use PINCTRL but also had to use the NRFX SPI driver for one of my SPI peripherals in order to utilize PPI), I did not find any DT macros that would just do this. Understanding the Device Tree, you can use a combination of other macros to access pin info. Here's an example:

dtsi file:

...    

    spi1_default: spi1_default {

        group1 {

            psels = <NRF_PSEL(SPIM_SCK, 1, 9)>,

                    <NRF_PSEL(SPIM_MOSI, 1, 8)>,

                    <NRF_PSEL(SPIM_MISO, 0, 4)>;

        };

    };

...

dts file:

...
&spi1 {
    compatible = "nordic,nrf-spim";
    status = "okay";
    pinctrl-0 = <&spi1_default>;
    pinctrl-1 = <&spi1_sleep>;
    pinctrl-names = "default", "sleep";
    cs-gpios = <&gpio0 31 GPIO_ACTIVE_LOW>;
};
...

application:

#define SPI_NODE DT_NODELABEL(spi1)

#define SPI_PINCTRL_NODE DT_CHILD(DT_PINCTRL_0(SPI_NODE, 0), group1)

Then in your SPI Configuration structure, you can grab the property like this:

nrfx_spim_config_t xSpiConfig = {

.sck_pin        = (uint8_t)DT_PROP_BY_IDX(SPI_PINCTRL_NODE, psels, 0) & 0x3F,

.mosi_pin       = (uint8_t)DT_PROP_BY_IDX(SPI_PINCTRL_NODE, psels, 1) & 0x3F,

.miso_pin       = (uint8_t)DT_PROP_BY_IDX(SPI_PINCTRL_NODE, psels, 2) & 0x3F,

.ss_pin         = DT_GPIO_PIN_BY_IDX(SPI_NODE, cs_gpios, 0),
...

The psel property will return a 32-bit configuration (defined in nrf-pinctrl.h), but you just need the first 6 bits.

If anyone knows an easier way, please share. 

[ngbe]

Hello Tristen,

Interesting, thank you for you experience sharing.

Stéphane

[Simon]

Hello Stéphane,

It seems like I was wrong in my first reply. The spi_nrfx_spim.c will not use the DT_PROP macros to get the sck, mosi and miso pins when pinctrl is enabled due to this check. Instead it will configure it through pin_ctrl_apply_state()-->pin_ctrl_apply_state_direct()-->pin_ctrl_configure_pins()

Please use the approach by Tristen instead:   RE: Which macro to get sck, mosi and miso pin on spi master  

I will get back to you if I find a better approach

Best regards,

simon