ADD mail box for pedal device

multi_tasking/pedal_device.hpp

@@ -33,22 +33,30 @@ namespace multi_tasking {
 
 class PedalDevice {
    public:
-    PedalDevice(Callback<void()> cbOnLeft,
-                Callback<void()> cbOnRight);  // NOLINT(runtime/references)
+    explicit PedalDevice(Mail<uint32_t, 16>* mailBox);  // NOLINT(runtime/references)
 
     // make the class non copyable
     PedalDevice(PedalDevice&)            = delete;
     PedalDevice& operator=(PedalDevice&) = delete;
 
     // method called for updating the bike system
-    std::chrono::milliseconds getCurrentRotationTime();
+    static std::chrono::milliseconds getCurrentRotationTime(uint32_t step);
 
    private:
+    // private methods
+    void onLeft();
+    void onRight();
+    void increaseRotationSpeed();
+    void decreaseRotationSpeed();
+
+    void sendMail(uint32_t data);
     // data members
     volatile uint32_t _currentStep = static_cast<uint32_t>(
         (bike_computer::kInitialPedalRotationTime - bike_computer::kMinPedalRotationTime)
             .count() /
         bike_computer::kDeltaPedalRotationTime.count());
+
+    Mail<uint32_t, 16>* _mailBox;
 };
 
 }  // namespace multi_tasking