Got compiler error "undefined reference to `__device_dts_ord_88'" when adding SPI to overlay.

Question

Hello dear Nordic team,

I'm quite experienced in developing under SDK V15 and V17 but absolutely novice for nRF Connect SDK so my question may seem ridiculos. Hope someone will help me.

Environment

OS: Windows 10

Toolchain: All recommended tools installed through the Toolchain Manager v1.2.1 including VS Code 1.73.1

SDK: nRF Connect SDK V2.1.2

Project

Modified demo project from SDK: ncs\v2.1.2\nrf\samples\bluetooth\peripheral_uart

Hardware

nRF52 DK(PCA10040)

Purpose

Get familiarized with development environment, Zephyr OS and coding concepts. Originally we are planning the new project based on nRF5340, but at meantime I'm using nRF52 DK for test project. Main goal is to have generic BLE connectivity and working UART, GPIOs, ADC and connect WS2812 LEDs via SPIM. Yes I know about demo project for controlling WS2812, but I want to put my hands on all settings I can in order to get understading about how it works.

Also I found 2 similar cases which didn't help me:

Zephyr WS2812 Driver undefined reference to `__device_dts_ord_68'

Implementing WS2812 Driver NCS (undefined reference to `__device_dts_ord_61')

Problem

Attempting to add SPI to overlay file leads to compiler error "undefined reference to `__device_dts_ord_88'". Here is what I have added to main.c file:

//Define SPI node
#define SPI_NODE DT_NODELABEL(spi1) //test
static const struct device *my_spi = DEVICE_DT_GET(SPI_NODE); //test

//Following snippet temporary added to uart_init() function:
if (!device_is_ready(my_spi))
        return -ENODEV;

Overlay file:

/*
 * Copyright (c) 2022 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
/ {
	chosen {
		nordic,nus-uart = &uart0;
	};

	
};

spi_1: &spi1 {
	compatible = "nordic,nrf-spim";
	status = "okay";
	miso-pin = <0xFF>;
	mosi-pin = <25>;
	sck-pin = <0xFF>;
	label = "WS_SPI";
};

The interesting point is if I comment out device_is_ready(my_spi) invokation project builds sucessfully. Same effect if I modify overlay like this:

/*
 * Copyright (c) 2022 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
 */
 
/ {
	chosen {
		nordic,nus-uart = &uart0;
	};

	
};

/ {
	chosen {
		nordic,spi = &spi1;
	};	
};

It makes me think that build system does not accept any modification of standard spi definition in device tree.

Where I go wrong?

Any help is appreciated! Thanks!

Einarh · Accepted Answer

Hello 
 undefined reference to `__device_dts_ord_88 
 It's correct that this is caused by an ill-defined devicetree. 
 I would suggest you have a look at the generated devicetree in build/zephyr/zephyr.dts to get an overview over what the devicetree looks like. 
 Not very many NCS versions ago, the peripheral config format you are using in your overlay was replaced by Zephyr's own Pin control API: 
 https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/ug_pinctrl.html 
 If there exists an up to date demo project for the sensor you are using, I would really recommend having a look at the devicetree in that project to help you get started. 
 Best regards, 
 Einar

Got compiler error "undefined reference to `__device_dts_ord_88'" when adding SPI to overlay.

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