Add mozc dial version.

Co-authored-by: Takashi Toyoshima <toyoshim@google.com>
Co-authored-by: Shun Ikejima <ikejima@google.com>

mozc-dial/firmware/common/motor_controller.h

@@ -0,0 +1,38 @@
+// Copyright 2025 Google Inc.
+// Use of this source code is governed by an Apache License that can be found
+// in the LICENSE file.
+
+#ifndef COMMON_MOTOR_CONTROLLER_H_
+#define COMMON_MOTOR_CONTROLLER_H_
+
+#include <cstdint>
+#include <memory>
+
+#include "pico/time.h"
+
+class MotorController final {
+ public:
+  enum class Mode { k1Motor, k9Motor };
+  explicit MotorController(Mode = Mode::k9Motor);
+  MotorController(const MotorController&) = delete;
+  MotorController& operator=(const MotorController&) = delete;
+  ~MotorController();
+
+  void Start(uint8_t index);
+  void Stop(uint8_t index);
+
+ private:
+  class Decoder;
+
+  static bool OnAlarm(repeating_timer* t);
+  void Step();
+
+  static constexpr size_t kNumOfPhases = 4;
+  static constexpr size_t kNumOfMotors = 9;
+  std::unique_ptr<Decoder> decoder_[kNumOfPhases];
+  bool started_[kNumOfMotors] = { false };
+  uint8_t phase_ = 0;
+  repeating_timer timer_;
+};
+
+#endif  // COMMON_MOTOR_CONTROLLER_H_