BL653 Trouble Getting SPI_DT_SPEC_GET

[LeviRand]

Hello,

I am using SDK v2.9.1 for a Bl653 (NRF52833) and was trying to use the Nordic Academy Example for how to setup the SPI bus. The Nordic Academy example states we must reference a SPI device "node", however, for the BL653 there does not seem to be one in any device tree files. I have tried using the name of the device "spi1" and the nrf52833's node for SPI but both of these result in a compilation error due to device tree linkage issues.

The device tree macro I am using:

struct spi_dt_spec spiSpec = SPI_DT_SPEC_GET(DT_NODELABEL(Some Node Goes Here), SPIOP, 0);

Bl653 Device Tree Overlay:

&spi1 {
	compatible = "nordic,nrf-spim";
	interrupts = <4 2>;
	status = "okay";
	cs-gpios = <&gpio0 28 GPIO_ACTIVE_LOW>;
	pinctrl-0 = <&spi1_default>;
	pinctrl-1 = <&spi1_sleep>;
	pinctrl-names = "default", "sleep";
};

Below is the NRF52833's device tree SPI declaration with the required SPI node "st25r3911b."

&spi0 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	cs-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>;

	pinctrl-0 = <&spi0_default_alt>;
	pinctrl-1 = <&spi0_sleep_alt>;
	pinctrl-names = "default", "sleep";
	st25r3911b@0 {
		compatible = "st,st25r3911b";
		reg = <0>;
		spi-max-frequency = <4000000>;
		irq-gpios = <&gpio0 3 GPIO_ACTIVE_HIGH>;
		led-nfca-gpios = <&gpio0 29 GPIO_ACTIVE_HIGH>;
	};
};

What node or alternative code should I be using to get my SPI bus working for the Bl653?

[Menon]

Hello,

Thank you for sharing the detailed build logs. While checking the logs, I noticed that the issue might be that the SPI device node is missing in the device tree macro. I believe you can configure the SPI device using the macro.

struct spi_dt_spec spiSpec = SPI_DT_SPEC_GET(DT_NODELABEL(st25r3911b), SPIOP, 0);

 

In your device tree, make sure to add a label, as DT_NODELABEL() works only with a label.

st25r3911b: st25r3911b@0 {
    compatible = "st,st25r3911b";
    ..
    ...
    
    
};

Check this device tree reference section.

Kind Regards,

Abhijith

[LeviRand]

Yes, this seems to be the answer!

I am able to get the project to compile when updating my devicetree overlay. The key factor was adding the label "st25r3911b:" before "st25r3911b@0" as you mentioned. For what I have seen, the examples for the nRF52833 don't have this label. Here is my device tree setup for anyone with the same problem.

I don't have my equipment to test currently, but will test Monday and verify the answer if this works.

Abhijith, I had a question that arose from this discussion. The irq-gpios and led-nfca-gpios properties are required to build the project properly, but I was unable to find documentation on what these do. Do you know?

Thanks for the help so far!

[Menon]

Hello,

LeviRand said:

I had a question that arose from this discussion. The irq-gpios and led-nfca-gpios properties are required to build the project properly, but I was unable to find documentation on what these do. Do you know?

This is not part of the standard SPI peripheral; I believe it comes from the NFC reader driver module you're using. Most likely, the driver itself is requesting and using the irq-gpios and led-nfca-gpios.

Could you let me know which driver you're using? Alternatively, you can check the driver code to see how the GPIOs are being configured or accessed.

Kind regards,
Abhijith