sample: drivers: dali: add a logger sample

A sample that logs frames on a DALI bus to UART/RTT.

Signed-off-by: Markus Becker <markushx@gmail.com>

Author: markushx

samples/drivers/dali_logger/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(dali_app LANGUAGES C)
+
+include(${ZEPHYR_BASE}/samples/subsys/usb/common/common.cmake)
+target_sources(app PRIVATE src/main.c)

samples/drivers/dali_logger/README.rst

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+.. zephyr:code-sample:: dali-logger
+   :name: Digital Addressable Lighting Interface (DALI) logger
+   :relevant-api: dali
+
+   Log activity on a DALI bus to UART.
+
+Overview
+********
+
+This sample utilizes the :ref:`dali <dali_api>` driver API to log DALI frames to UART.
+
+Building and Running
+********************
+
+The interface to the DALI bus is defined in the board's devicetree. For details see the dali_ sample.
+
+.. note:: For proper operation a DALI specific physical interface is required.
+
+Building and Running for Nordic nRF52840
+============================================
+The :zephyr_file:`samples/drivers/dali_logger/boards/nrf52840dk/nrf52840.overlay`
+is specifically for the Mikroe-2672 DALI2 click development board
+used as physical interface to the DALI bus. This board uses negative
+logic for signal transmission (Tx Low <-> DALI Bus Idle).
+The sample can be build and executed for the
+:zephyr:board:`nrf52840` as follows:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/drivers/dali
+   :board: nrf52840dk/nrf52840
+   :goals: build flash
+   :compact:
+
+Sample outout
+=============
+
+You should see log on DALI, when there's activity on the bus.

samples/drivers/dali_logger/boards/nrf52840dk_nrf52840.overlay

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+/*
+ * Copyright 2025 by Markus Becker
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * add DALI 2 Click (MIKROE-2672)
+ * via Arduino UNO click shield (MIKROE-1581)
+ * to nRF52840 DK (pca10056)
+ * DALI 2 Click
+ *   DALI TX 2
+ *   DALI RX 15
+ * Arduino UNO click shield:
+ *   DALI TX 2  > A3
+ *   DALI RX 15 > D2
+ * nRF52840 DK:
+ *   DALI TX A3 > P0.29
+ *   DALI RX D2 > P1.03
+ */
+
+/ {
+	dali0: dali {
+		compatible = "zephyr,dali-pwm";
+		status = "okay";
+		counter = <&timer2>;
+		pwms = <&pwm0 0 PWM_USEC(41) PWM_POLARITY_NORMAL>;
+		rx-gpios = <&gpio1 3 GPIO_ACTIVE_HIGH>; // D2
+		tx-flank-shift-us = <(-35)>;
+		rx-flank-shift-us = <(-59)>;
+		tx-rx-propagation-max-us = <2400>;
+		rx-max-latency-us = <80>;
+		rx-grey-area-us = <800>;
+	};
+};
+
+&pinctrl {
+	pwm0_default: pwm0_default {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 0, 29)>; // A3
+			nordic,invert;
+		};
+	};
+
+	pwm0_sleep: pwm0_sleep {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 0, 29)>; // A3
+			low-power-enable;
+		};
+	};
+};
+
+&timer2 {
+	compatible = "nordic,nrf-timer";
+	status = "okay";
+	prescaler = <4>;
+};

samples/drivers/dali_logger/prj.conf

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+CONFIG_DALI=y
+
+CONFIG_LOG=y
+CONFIG_LOG_BACKEND_SHOW_COLOR=n
+CONFIG_LOG_BACKEND_SHOW_LEVEL=n
+CONFIG_LOG_FUNC_NAME_PREFIX_DBG=n
+CONFIG_LOG_BACKEND_SHOW_TIMESTAMP=y
+CONFIG_LOG_BACKEND_FORMAT_TIMESTAMP=n
+
+CONFIG_DALI_LOW_LEVEL_LOG_LEVEL_OFF=y

samples/drivers/dali_logger/sample.yaml

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+sample:
+  description: DALI Logger application
+  name: dali-logger
+common:
+  build_only: true
+  integration_platforms:
+    - nrf52840dk/nrf52840
+tests:
+  app.default: {}
+  app.debug:
+    extra_overlay_confs:
+      - debug.conf

samples/drivers/dali_logger/src/main.c

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+/*
+ * Copyright (c) 2025 by Markus Becker <markushx@gmail.com>
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/device.h>
+#include <zephyr/drivers/dali.h>
+
+#include <zephyr/logging/log.h>
+LOG_MODULE_REGISTER(D, LOG_LEVEL_INF);
+
+static uint32_t packet_counter;
+
+void dali_rx_callback(const struct device *dev, struct dali_frame frame, void *user_data)
+{
+	LOG_INF("RX %u %u %x", packet_counter++, frame.event_type, frame.data);
+}
+
+#define DALI_NODE DT_NODELABEL(dali0)
+
+int main(void)
+{
+	LOG_INF("DALI Logger");
+	LOG_INF("Target board: %s", CONFIG_BOARD_TARGET);
+
+	/* get the DALI device */
+	const struct device *dali_dev = DEVICE_DT_GET(DALI_NODE);
+
+	if (!device_is_ready(dali_dev)) {
+		LOG_ERR("failed to get DALI device.");
+		return 0;
+	}
+
+	dali_receive(dali_dev, dali_rx_callback, NULL);
+
+	/* idle and wait for callbacks */
+	for (;;) {
+		k_sleep(K_MSEC(60000));
+		LOG_INF("ALIVE");
+	}
+	return 0;
+}