Issue to configure SPI on nRF5340

Question

Hello,

I am experiencing issues with an nRF5340 board and its SPI.

I am trying to add an Pmod OLED (128x32) screen to my board, but firstly I am trying to set up the SPI communication.

I would like to make my code the more board agnostic possible so I am avoiding nRF libraries and focusing on Zephyr's ones.

I am using nRF SDK 2.0.0 with VS Code extensions.

I have activated the SPI in the prj.conf with : CONFIG_SPI=y

I have configure spi1 in the nrf5340dk_nrf5340_cpuapp.overlay like that:

&spi1 {
    compatible = "nordic,nrf-spi-common";
	status = "okay";
    
    sck-pin = < 0 >;
    miso-pin = < 1 >;
    mosi-pin = < 2 >;
    cs-gpios = < &gpio0 3 GPIO_ACTIVE_LOW >;
};

And my main.c looks like this:

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <device.h>
#include <drivers/spi.h>
#include <zephyr.h>

#define SPI		DT_NODELABEL(spi1)



void main(void)
{

	struct spi_config spi_cfg = {
		.operation= SPI_WORD_SET(8) | SPI_TRANSFER_MSB | SPI_OP_MODE_MASTER,
		.frequency = 1000000,
	};

	const char * pcLabelSpi = DT_LABEL(SPI);
	
	struct spi_dt_spec spi = {
		.bus = device_get_binding(pcLabelSpi),
		.config = spi_cfg,
	};
	if (spi.bus == NULL) {
		printk("Could not get spi device: %s\n", pcLabelSpi);
		return;
	}

	int err = 0;

	uint8_t iDataTx = 0x12;
	uint8_t * pDataTx = &iDataTx;

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

	
	while (1)
	{
		if(spi_is_ready(&spi))
		{	
			printk("SPI transmitting...\n");

			err = spi_write_dt(&spi, &tx);
			if(err)
				printk("SPI transmit failed, error: %d\n", err);
		} 
		else 
			printk("SPI not ready: %s\n", pcLabelSpi);

		k_sleep(K_SECONDS(1));
	}
}

My troubles come from the device_get_biding() function which return me a NULL so my code go into the if and stop.

I think the function return me a NULL because of the configuration but I can't find what is the problem.

Also, I tried with spi2 (which is already configured but not as I want) and the get_binding function works. So it may confirms that the issue come from my configuration.

Thanks in advance for your help.

Regards,

Sulian

Jared · Accepted Answer

Hi, 
 In NCS v2.0.0 you have to use Pin Control to specify what pins to use for the peripheral. You would have to specify the pins used for device by adding the pinctrl node to the devicetree overlay. See this for a guide on how to implement it. 
 regards 
 Jared

Issue to configure SPI on nRF5340

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