SPI example for Zephyr (nRF COnnect SDK v1.6.0-rc2)

[Fb62]

Hello,

I need an example for using the spi in zephyr and how to change the pins if necessary.

Where can I find it?

Thank you

[Albrecht Markus Schellenberger]

Hello,

Yes, there are a bunch of examples from Zephyr showing the usage of the SPI interface API.

You could for instance have a look at the SPI drivers of the BM280 sample.

For changing pins you can use a devicetree overlay file.

Regards,

Markus

[Fb62]

HI Markus,

from bme280 i get the function to get the device  and i have modified for use the spi2 

of board.dts (NRF52-DK), but i have error no device found.

How am I wrong?

Thanks

const struct device *spi2_dev;

static const struct device *get_spi2_device(void)
{
const struct device *dev;
dev= DEVICE_DT_GET_ANY(arduino_spi);

if (dev == NULL) {
/* No such node, or the node does not have status "okay". */
printk("\nError: no device found.\n");
return NULL;
}

if (!device_is_ready(dev)) {
printk("\nError: Device \"%s\" is not ready; "
"check the driver initialization logs for errors.\n",
dev->name);
return NULL;
}

printk("Found device \"%s\", getting sensor data\n", dev->name);
return dev;
}

[Albrecht Markus Schellenberger]

Hello,

DEVICE_DT_GET_ANY has the devicetree compatible as input arugment. You are using a subnode label.

So in case of nrf52dk_nrf52832 this would be:

compatible = "nordic,nrf-spi";

But using this function is probably not a good idea since you have several SPI peripherals with the same compatibale avialable. 

spi0: spi@40003000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40003000 0x1000 >;
			interrupts = < 0x3 0x1 >;
			status = "disabled";
			label = "SPI_0";
			compatible = "nordic,nrf-spi";
			sck-pin = < 0x1b >;
			mosi-pin = < 0x1a >;
			miso-pin = < 0x1c >;
		};
		spi1: spi@40004000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40004000 0x1000 >;
			interrupts = < 0x4 0x1 >;
			status = "okay";
			label = "SPI_1";
			compatible = "nordic,nrf-spi";
			sck-pin = < 0x1f >;
			mosi-pin = < 0x1e >;
			miso-pin = < 0x1d >;
		};
		spi2: arduino_spi: spi@40023000 {
			#address-cells = < 0x1 >;
			#size-cells = < 0x0 >;
			reg = < 0x40023000 0x1000 >;
			interrupts = < 0x23 0x1 >;
			status = "okay";
			label = "SPI_2";
			compatible = "nordic,nrf-spi";
			sck-pin = < 0x19 >;
			mosi-pin = < 0x17 >;
			miso-pin = < 0x18 >;
			cs-gpios = < &arduino_header 0x10 0x1 >;
		};

And as the API description states: "If there are multiple, this returns an arbitrary one."  I recommend you using this function instead.

Regards,

Markus

[Fb62]

Hi Markus,

Hi Markus,

thanks for your help, but still i can't understand how to open the SPI2, using the functions you suggest. An example is available that uses these functions.

Thanks in advance.

Fausto

[Fb62]

Hi Markus,

Hi Markus,

thanks for your help, but still i can't understand how to open the SPI2, using the functions you suggest. An example is available that uses these functions.

Thanks in advance.

Fausto