Error while trying to config SPI in VS code .

[Manas_punjabi]

HI i am working with the nrf 52833 dk board using  nrf connect and trying to implement SPI ,

#define SPI3_NODE DT_NODELABEL(SPI_3)

static const struct spi_dt_spec* dev_spi = SPI_DT_SPEC_GET(SPI3_NODE,SPI_OP_MODE_MASTER,1);

I am getting this error - identifier "__device_dts_ord_DT_N_NODELABEL_SPI_3_BUS_ORD" is undefined. 

I am new to ncs and zephyr , so what is causing this error?

[Marte Myrvold]

Hi,

Please try using this SPI example made by a former colleague of mine as a starting point instead: https://github.com/crfosse/ncs_projects/tree/main/peripheral_zephyr/spi

Best regards,

Marte

[Manas_punjabi]

Hi , thank you for your response,

A little simple doubt I have  ,after reading through the sample , what is the difference in using the CS pin through the 

spi_cs_control                                          and 

cs-gpios = <&gpio0 16 GPIO_ACTIVE_LOW>;

[Manas_punjabi]

If possible could you help me out in trying to use the 1st sample only , I am trying to implement flash and the only thing I want to try first is getting the manufacture ID.

[Manas_punjabi]

#include <zephyr.h>
#include <sys/printk.h>
#include <device.h>
#include <drivers/spi.h>
#include <hal/nrf_gpio.h>

#define CS_PIN 16

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,
};

const struct device * spi_dev;

static void spi_init(void)
{
	#define SPI_3 DT_NODELABEL(spi3)
	const struct device *spi_dev = device_get_binding(DT_LABEL(SPI_3));
}

void spi_test_send(void)
{
	int err;
	static uint8_t tx_buffer[1];
	static uint8_t rx_buffer[1];

	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
	};
	nrf_gpio_cfg_output(CS_PIN);
		// GPIO_SetBits(SPI_CS_MS_DEMO_PIN);
		nrf_gpio_pin_set(CS_PIN);
		// GPIO_ResetBits(SPI_CS_MS_DEMO_PIN);
		nrf_gpio_pin_clear(CS_PIN);
		tx_buffer[0]=0x9F;
		// SPI_Send_Receive_Data(&a, &a1);
		err = spi_transceive(spi_dev, &spi_cfg, &tx, &rx);
	if (err) {
		printk("SPI error: %d\n", err);
	}else{
		printk("TX sent: %x\n", tx_buffer[0]);
		printk("RX recv: %x\n", rx_buffer[0]);
	}

		nrf_gpio_pin_set(CS_PIN);
	
}

void main(void)
{
	printk("SPIM Example\n");
	spi_init();

	while (1) {
		spi_test_send();
		k_sleep(K_SECONDS(1));
	}
}

this is the code i am working with , what changes do you suggest i make 

I cannot establish a connection only with the spi device .

[Marte Myrvold]

Hi,

Have you checked that the SPI device is found? For example:

if (spi_dev == NULL) {
	printk("Could not get %s device\n", spiName);
	return;
}

Best regards,

Marte

[Manas_punjabi]

yes i have managed to get that , 

err = spi_transceive(spi_dev, &spi_cfg, &tx, &rx);
	if (err) {
		printk("SPI error: %d\n", err);
		}

im getting error value to be -22

[Marte Myrvold]

Hi,

I do not believe you get the SPI device successfully. You are creating a new spi_dev inside of spi_init(). Try the following instead:

const struct device * spi_dev;

static void spi_init(void)
{
	#define SPI_3 DT_NODELABEL(spi3)
	spi_dev = device_get_binding(DT_LABEL(SPI_3));
	if (spi_dev == NULL) {
		printk("Could not get device\n");
		return;
	}
}

Then remove everything on lines 47 to 53, i.e. this part:

nrf_gpio_cfg_output(CS_PIN);
// GPIO_SetBits(SPI_CS_MS_DEMO_PIN);
nrf_gpio_pin_set(CS_PIN);
// GPIO_ResetBits(SPI_CS_MS_DEMO_PIN);
nrf_gpio_pin_clear(CS_PIN);
tx_buffer[0]=0x9F;
// SPI_Send_Receive_Data(&a, &a1);

And also remove nrf_gpio_pin_set(CS_PIN); on line 62.

Best regards,

Marte