nRF9160 Lora SPI

[isurki]

Dear Community;

We are trying to send data via Lora using a nRF9160. The Lora transreceiver we are using is a RFM95W(Semtech SX1272). There are samples of code to receive and send messages under /zephyr/samples/drivers/lora/ . I can open any of those prejects with SEGGER but not compile them. It pops up this error: 

"No default LoRa radio specified in DT"

We don´t know how to specify Lora device in DT, so far we have tried this in .overlay:

&spi3 { 
    compatible = "nordic,nrf-spim"; 
    status = "okay";
    sck-pin = <20>;
    mosi-pin = <21>;
    miso-pin = <22>;
    cs-gpios = <&gpio0 19 GPIO_ACTIVE_LOW>;
};

and this in prj.conf:

CONFIG_LOG=y
CONFIG_SPI=y
CONFIG_GPIO=y
CONFIG_LORA=y
CONFIG_LORA_SX12XX=y
CONFIG_PRINTK=y
CONFIG_SPI_3=y

Any help is appreciated.

Regards.

[Håkon Alseth]

Hi,

 

You need to define the sx12xx device in dts as well, similar like in this thread:

https://devzone.nordicsemi.com/f/nordic-q-a/68747/board-nrf52dk_nrf52832-do-not-work-with-zephyr/291141#291141

 

Could you try this and see if this works?

 

Kind regards,

Håkon

[isurki]

Hi,

Thank you for your fast answer. We are using the Actinius Icarus nRF9160 board. If I have understood well the file to modified would be /boards/arm/actinius_icarus/actinius_icarus_ns.dts,  and there I need to add 

		lora0 = &lora;

and

&spi3 {
	compatible = "nordic,nrf-spi";
	status = "okay";
	sck-pin = <25>;
	mosi-pin = <23>;
	miso-pin = <24>;
	cs-gpios = <&gpio0 22 GPIO_ACTIVE_LOW>;

	lora: sx1276@0 {
		compatible = "semtech,sx1276";
		reg = <0>;
		label = "sx1276";

		dio-gpios = <&gpio0 13 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
					<&gpio0 14 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
					<&gpio0 15 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
					<&gpio0 16 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
					<&gpio0 29 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>;
		reset-gpios = <&gpio0 3 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
		rfo-enable-gpios		 = 	<&gpio0 30 GPIO_ACTIVE_HIGH>;
		spi-max-frequency		 = 	<1000000>;
		power-amplifier-output	 = "rfo";

/*
		rfi-enable-gpios			= <&gpio0 xx GPIO_ACTIVE_HIGH>;
		power-amplifier-output		= "pa-boost";
		pa-boost-enable-gpios		= <&gpio0 xx GPIO_ACTIVE_HIGH>;
		antenna-enable-gpios		= <&gpio0 xx GPIO_ACTIVE_HIGH>;
		tcxo-power-gpios			= <&gpio0 xx GPIO_ACTIVE_HIGH>;
		tcxo-power-startup-delay-ms	= <5>;
*/
	};
};

Right?

Regards.

[Håkon Alseth]

Hi,

 

You could add this to your specific project instead of altering the board file.

This is done by creating a file named $(BOARD).overlay (actinius_icarus_ns.overlay in your case), and placing it in your application folder (where your prj.conf also lies).

Then add the specific overlay, in your case for &spi3.

 

Kind regards,

Håkon

[isurki]

Hi, 

That makes more sense, however I was not sure...

Now, I have in samples/drivers/lora/send this actinius_icarus_ns.overlay file:

&uart0 {
    current-speed = <115200>;
    status = "okay";
    tx-pin = <23>;
    rx-pin = <24>;
};

&uart1 {
    status = "disabled";
};

&spi3 {
    compatible = "nordic,nrf-spi";
    status = "okay";
    sck-pin = <20>;
    mosi-pin = <21>;
    miso-pin = <22>;
    cs-gpios = <&gpio0 19 GPIO_ACTIVE_LOW>;
    lora: sx1276@0 {
	compatible = "semtech,sx1276";
	reg = <0>;
	label = "sx1276";

	dio-gpios = <&gpio0 13 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
		<&gpio0 14 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
		<&gpio0 15 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
		<&gpio0 16 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
		<&gpio0 29 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>;
	reset-gpios = <&gpio0 3 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
	rfo-enable-gpios		 = 	<&gpio0 30 GPIO_ACTIVE_HIGH>;
	spi-max-frequency		 = 	<1000000>;
	power-amplifier-output	 = "rfo";

/*
	rfi-enable-gpios			= <&gpio0 xx GPIO_ACTIVE_HIGH>;
	power-amplifier-output		= "pa-boost";
	pa-boost-enable-gpios		= <&gpio0 xx GPIO_ACTIVE_HIGH>;
	antenna-enable-gpios		= <&gpio0 xx GPIO_ACTIVE_HIGH>;
	tcxo-power-gpios			= <&gpio0 xx GPIO_ACTIVE_HIGH>;
	tcxo-power-startup-delay-ms	= <5>;
*/
	};
};

and this prj.conf:

CONFIG_LOG=y
CONFIG_SPI=y
CONFIG_GPIO=y
CONFIG_LORA=y
CONFIG_LORA_SX12XX=y
CONFIG_PRINTK=y
CONFIG_SPI_3=y

With that configuration I can´t even open the project with Segger:

CMake Error at ../../../../cmake/extensions.cmake:398 (add_library):
  No SOURCES given to target: drivers__spi
Call Stack (most recent call first):
  ../../../../cmake/extensions.cmake:375 (zephyr_library_named)
  ../../../../drivers/spi/CMakeLists.txt:3 (zephyr_library)



error: cmake failed
create_nordic_project.py failed (1)


Regards.

[Håkon Alseth]

Hi,

 

My apologies. The nrf9160 (and nrf53-series) does not have the legacy "spi" module, so you need to specify it to be "nordic,nrf-spim" instead.

The sample asks for "lora0" device, so we also need to provide an alias from "lora" to "lora0" in the overlay file.

Here's an example .overlay that I used to test-compile this project:

/ {
	aliases {
		lora0 = &lora;
	};
};

&uart0 {
    current-speed = <115200>;
    status = "okay";
    tx-pin = <23>;
    rx-pin = <24>;
};

&uart1 {
    status = "disabled";
};

&spi3 {
    compatible = "nordic,nrf-spim";
    status = "okay";
    sck-pin = <20>;
    mosi-pin = <21>;
    miso-pin = <22>;
    cs-gpios = <&gpio0 19 GPIO_ACTIVE_LOW>;
    lora: sx1276@0 {
		compatible = "semtech,sx1276";
		reg = <0>;
		label = "sx1276";

		dio-gpios = <&gpio0 13 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
			<&gpio0 14 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
			<&gpio0 15 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
			<&gpio0 16 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>,
			<&gpio0 29 (GPIO_PULL_DOWN | GPIO_ACTIVE_HIGH)>;
		reset-gpios = <&gpio0 3 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
		rfo-enable-gpios		 = 	<&gpio0 30 GPIO_ACTIVE_HIGH>;
		spi-max-frequency		 = 	<1000000>;
		power-amplifier-output	 = "rfo";

	/*
		rfi-enable-gpios			= <&gpio0 xx GPIO_ACTIVE_HIGH>;
		power-amplifier-output		= "pa-boost";
		pa-boost-enable-gpios		= <&gpio0 xx GPIO_ACTIVE_HIGH>;
		antenna-enable-gpios		= <&gpio0 xx GPIO_ACTIVE_HIGH>;
		tcxo-power-gpios			= <&gpio0 xx GPIO_ACTIVE_HIGH>;
		tcxo-power-startup-delay-ms	= <5>;
	*/
	};
};

 

Could you try this one and see if it works better at your end?

 

Kind regards,

Håkon