SPI example for nRF52833 with nRF Connect SDK 2.3.0

Question

Dear Support Team, 
 
 I just started evaluating a nRF52833 DK board with the nRF Connect SDK 2.3.0. At this point I would like to start playing with the SPI but unfortunately I can't find any working example that I could use. 
 Could you please point me to a working example without using the deprecated configuration parameters? 
 
 Thank you very much in advance and all the best, 
 Viktor

ViktorVarjas · Accepted Answer

Hi Marte!

I managed to make the communication to the sensor work! I post the solution here so others can use it as well.

Thanks again for the help!

Overlay:

&pinctrl {
	spi1_default: spi1_default {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 31)>,
					<NRF_PSEL(SPIM_MOSI, 0, 30)>,
					<NRF_PSEL(SPIM_MISO, 0, 29)>;
		};
	};

	spi1_sleep: spi1_sleep {
		group1 {
			psels = <NRF_PSEL(SPIM_SCK, 0, 31)>,
					<NRF_PSEL(SPIM_MOSI, 0, 30)>,
					<NRF_PSEL(SPIM_MISO, 0, 29)>;
			low-power-enable;
		};
	};
};

my_spi_master: &spi1 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	pinctrl-0 = <&spi1_default>;
	pinctrl-1 = <&spi1_sleep>;
	cs-gpios = <&gpio0 28 GPIO_ACTIVE_LOW>;
	reg_my_spi_master: spi-dev-a@0 {
		reg = <0>;
	};
};

SPI initialization:

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/devicetree.h>
#include <zephyr/drivers/gpio.h>
#include <zephyr/drivers/spi.h>

#define MY_SPI_MASTER DT_NODELABEL(my_spi_master)

// SPI master functionality
const struct device *spi_dev;

struct spi_cs_control spim_cs = {
	.gpio = SPI_CS_GPIOS_DT_SPEC_GET(DT_NODELABEL(reg_my_spi_master)),
	.delay = 0,
};


static const struct spi_config spi_cfg = {
	.operation = SPI_WORD_SET(8) | SPI_TRANSFER_MSB |
				 SPI_MODE_CPOL | SPI_MODE_CPHA,
	.frequency = 4000000,
	.slave = 0,
	.cs = &spim_cs,
};

static void spi_init(void)
{
	spi_dev = DEVICE_DT_GET(MY_SPI_MASTER);
	if(!device_is_ready(spi_dev)) {
		printk("SPI master device not ready!\n");
	}
	if(!device_is_ready(spim_cs.gpio.port)){
		printk("SPI master chip select device not ready!\n");
	}
}

Test code that reads the accelerometer device ID:

static int spi_test(void)
{
	static uint8_t tx_buffer[3];
	static uint8_t rx_buffer[3];

	const struct spi_buf tx_buf = {
		.buf = tx_buffer,
		.len = sizeof(tx_buffer)
	};
	const struct spi_buf_set tx = {
		.buffers = &tx_buf,
		.count = 1
	};

	struct spi_buf rx_buf = {
		.buf = rx_buffer,
		.len = sizeof(rx_buffer),
	};
	const struct spi_buf_set rx = {
		.buffers = &rx_buf,
		.count = 1
	};


	/*
	first 2 bytes of tx specify read/write action and on which register to perform
	last byte of rx contains the respons from the accelerometer
	*/
	tx_buffer[0] = XL367_REG_READ;
	tx_buffer[1] = XL367_DEVID_AD;

	int error = spi_transceive(spi_dev, &spi_cfg, &tx, &rx);
	if(error != 0){
		printk("SPI transceive error: %i\n", error);
		return error;
	}


	if(DEVICE_ID == rx_buffer[2])
	{
		printk("Successfull ACC communication\n");
	}
	else
	{
		printk("Faild ACC communication\n");
	}

	return 0;
}

SPI example for nRF52833 with nRF Connect SDK 2.3.0

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