RE: How to configure the SPIM MOSI/MISO/SCK pins

Kazi Afroza Sultana — Mon, 01 Dec 2025 14:07:05 GMT

Hello,

You set SPIM in the device tree using zephyr's pincntrl and in the code you used nrfx nrfx_spim_init() configuration, which are completely independent.

You can look at this Lesson 5 - Serial Peripheral Interface (SPI) - Nordic Developer Academy lesson from devacademy to know how to implement SPI in the application.

RE: How to configure the SPIM MOSI/MISO/SCK pins

Scigrapher — Sat, 29 Nov 2025 19:34:30 GMT

In your main.c, it looks like you're setting the all the pins to NRFX_SPIM_PIN_NOT_USED and using it like that. What happens if you put the correct pin values?

What you're doing seems pretty manual. Here's an example of something I'm working on... Note that I'm using an nRF54l15, so device names and pins will be different. The waveshare_epd device is specific to my stuff - In this example I'm using SPI to connect to a display device from Waveshare. You'll want to replace that with a reference to the driver for your device that's on the SPI bus. If it's a custom device (or no definition already exists for it), you'll need a YAML file that describes it.

&pinctrl {

spi22_default: spi22_default {

group1 {

psels = <NRF_PSEL(SPIM_SCK, 1, 11)>,

<NRF_PSEL(SPIM_MOSI, 1, 12)>,

<NRF_PSEL(SPIM_MISO, 1, 13)>; /* optional, write-only display */

};

};

spi22_sleep: spi22_sleep {

group1 {

psels = <NRF_PSEL(SPIM_SCK, 1, 11)>,

<NRF_PSEL(SPIM_MOSI, 1, 12)>,

<NRF_PSEL(SPIM_MISO, 1, 13)>;

low-power-enable;

};

};

};

&spi22 {

compatible = "nordic,nrf-spim";

status = "okay";

pinctrl-0 = <&spi22_default>;

pinctrl-1 = <&spi22_sleep>;

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

cs-gpios = <&gpio1 3 GPIO_ACTIVE_LOW>; /* Chip select */

clock-frequency = <20000000>;

waveshare_epd: epd@0 {

compatible = "waveshare,4in-eink";

reg = <0>;

spi-max-frequency = <20000000>;

dc-gpios = <&gpio0 0 0>;

rst-gpios = <&gpio0 1 0>;

busy-gpios = <&gpio0 2 GPIO_ACTIVE_HIGH>;

pwr-gpios = <&npm1300_gpio 2 GPIO_ACTIVE_HIGH>;

buck-en-gpios = <&npm1300_gpio 1 GPIO_ACTIVE_HIGH>;

spi-rx-bits = <0>; /* write-only */

};

};

And that sets up the device for me. I don't init the SPI bus. The code does:

// Get reference to SPI device from devicetree

#define SPIOP SPI_WORD_SET(8) | SPI_TRANSFER_MSB

struct spi_dt_spec spispec = SPI_DT_SPEC_GET(DT_NODELABEL(waveshare_epd), SPIOP, 0);
...

if (!spi_is_ready_dt(&spispec)) {

LOG_ERR("SPI controller not ready");

return;

}

...

gpio_pin_set_dt(&cs_pin, 0);

struct spi_buf tx_spi_buf = {.buf = &cmd, .len = 1};

struct spi_buf_set tx_spi_buf_set = {.buffers = &tx_spi_buf, .count = 1};

int err = spi_write_dt(&spispec, &tx_spi_buf_set);

if (err < 0) {

LOG_ERR("spi_write_dt() failed, err %d", err);

}

gpio_pin_set_dt(&cs_pin, 1);