samples: Added tone_doremi sample

Add a tone_doremi sample to demonstrate how to sounding with tone API

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: soburi

samples/tone_doremi/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+# get value of NORMALIZED_BOARD_TARGET early
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE} COMPONENTS yaml boards)
+
+if (EXISTS ${CMAKE_CURRENT_LIST_DIR}/../../variants/${NORMALIZED_BOARD_TARGET}/${NORMALIZED_BOARD_TARGET}_${BOARD_REVISION}.overlay)
+  set(DTC_OVERLAY_FILE ${CMAKE_CURRENT_LIST_DIR}/../../variants/${NORMALIZED_BOARD_TARGET}/${NORMALIZED_BOARD_TARGET}_${BOARD_REVISION}.overlay)
+elseif (EXISTS ${CMAKE_CURRENT_LIST_DIR}/../../variants/${NORMALIZED_BOARD_TARGET}/${NORMALIZED_BOARD_TARGET}.overlay)
+  set(DTC_OVERLAY_FILE ${CMAKE_CURRENT_LIST_DIR}/../../variants/${NORMALIZED_BOARD_TARGET}/${NORMALIZED_BOARD_TARGET}.overlay)
+endif()
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(tone_doremi)
+
+target_sources(app PRIVATE src/app.cpp)
+
+zephyr_compile_options(-Wno-unused-variable -Wno-comment)

samples/tone_doremi/README.rst

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+.. _tone_doremi:
+
+Tone DoReMi
+###########
+
+Overview
+********
+
+Use tone to play the scale.
+Play Do, Re, Mi on D4 pin, then Fa, So, La on D5 pin.
+
+Building and Running
+********************
+
+Build and flash tone_doremi sample as follows,
+
+.. code-block:: sh
+
+   $> west build -p -b arduino_nano_33_ble samples/tone_doremi/
+
+   $> west flash --bossac=/home/$USER/.arduino15/packages/arduino/tools/bossac/1.9.1-arduino2/bossac

samples/tone_doremi/prj.conf

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+CONFIG_ARDUINO_API=y
+CONFIG_ARDUINO_MAX_TONES=2

samples/tone_doremi/src/app.cpp

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+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2026 TOKITA Hiroshi
+ */
+
+#include <Arduino.h>
+#include "zephyrSerial.h"
+
+#define NOTE_C4  262
+#define NOTE_D4  294
+#define NOTE_E4  330
+#define NOTE_F4  349
+#define NOTE_G4  392
+#define NOTE_A4  440
+
+void setup() {
+  Serial.begin(115200);
+}
+
+void loop() {
+  Serial.println("Do@D4");
+  tone(D4, NOTE_C4, 1000);
+  delay(1000);
+  Serial.println("Re@D4");
+  tone(D4, NOTE_D4, 1000);
+  delay(1000);
+  Serial.println("Mi@D4 - Infinity");
+  tone(D4, NOTE_E4, 0);
+  delay(1000);
+  Serial.println("Fa@D5");
+  tone(D5, NOTE_F4, 1000);
+  delay(1000);
+  Serial.println("So@D5");
+  tone(D5, NOTE_G4, 1000);
+  delay(1000);
+  Serial.println("La@D5 - Infinity");
+  tone(D5, NOTE_A4, 0);
+
+  while(true);
+}
+