Code cleanup

Ongoing refactoring... it compiles, but that's about it

src/Buzzer.cpp

@@ -1,53 +1,50 @@
-#include "Buzzer.h"
+#include "buzzer.h"
 #include <Arduino.h>
-#include "Config.h"
+#include "config.h"
 
-void buzzStartup()
+
+void Buzzer::playNote(uint16_t frequency, uint16_t duration)
 {
-  tone(PinBuzzer, 1000);
-  delay(50);
-  noTone(PinBuzzer);  
+  tone(PinBuzzer, frequency);
+  delay(duration);
+  noTone(PinBuzzer);
 }
 
 
-void buzzSelect()
+void Buzzer::startup()
 {
-  tone(PinBuzzer, 1000);
-  delay(1);
-  noTone(PinBuzzer);  
+  playNote(1000, 50);
 }
 
 
-void buzzClick()
+void Buzzer::select()
 {
-  tone(PinBuzzer, 1000);
-  delay(25);
-  noTone(PinBuzzer);  
+  playNote(1000, 1);
 }
 
 
-void buzzCompleted()
+void Buzzer::click()
+{
+  playNote(1000, 25);
+}
+
+
+void Buzzer::completed()
 {
   for (int i = 0; i < 3; i++)
   {
-    tone(PinBuzzer, 1000);
-    delay(250);
-    noTone(PinBuzzer);    
-
+    playNote(1000, 250);
     delay(500);
   }
 }
 
 
-void buzzMemoryCleared()
+void Buzzer::memoryCleared()
 {
   for (int i = 0; i < 5; i++)
   {
-    tone(PinBuzzer, 1000);
-    delay(25);
-    noTone(PinBuzzer);    
-
+    playNote(1000, 25);
     delay(250);
-  }  
+  }
 }
 

src/Buzzer.h

@@ -1,10 +1,19 @@
-#ifndef __Buzzer
-#define __Buzzer
+#ifndef __buzzer
+#define __buzzer
 
-void buzzStartup();
-void buzzSelect();
-void buzzClick();
-void buzzCompleted();
-void buzzMemoryCleared();
+#include <Arduino.h>
+
+class Buzzer
+{
+  protected:
+    static void playNote(uint16_t frequency, uint16_t duration);
+
+  public:
+    static void startup();
+    static void select();
+    static void click();
+    static void completed();
+    static void memoryCleared();
+};
 
 #endif

src/Config.cpp

@@ -1,6 +1,6 @@
 #include "Config.h"
 
-byte LCDCharArrowRightMap[8] = {
+uint8_t LCDCharArrowRightMap[8] = {
   B00000,
   B01000,
   B01100,
@@ -10,7 +10,7 @@ byte LCDCharArrowRightMap[8] = {
   B00000,
 };
 
-byte LCDCharArrowLeftMap[8] = {
+uint8_t LCDCharArrowLeftMap[8] = {
   B00000,
   B00100,
   B01100,
@@ -20,7 +20,7 @@ byte LCDCharArrowLeftMap[8] = {
   B00000,
 };
 
-byte LCDCharArrowRightHollowMap[8] = {
+uint8_t LCDCharArrowRightHollowMap[8] = {
   B00000,
   B01000,
   B00100,
@@ -30,7 +30,7 @@ byte LCDCharArrowRightHollowMap[8] = {
   B00000,
 };
 
-byte LCDCharArrowLeftHollowMap[8] = {
+uint8_t LCDCharArrowLeftHollowMap[8] = {
   B00000,
   B00100,
   B01000,
@@ -40,7 +40,7 @@ byte LCDCharArrowLeftHollowMap[8] = {
   B00000,
 };
 
-byte LCDCharUpDownMap[8] = {
+uint8_t LCDCharUpDownMap[8] = {
   B00000,
   B00100,
   B01110,

src/Config.h

@@ -1,43 +1,44 @@
 #ifndef __Config
 #define __Config
 
-#include "Arduino.h"
+#include <Arduino.h>
+
+const int PinLCDRS = 7;
+const int PinLCDEN = 8;
+const int PinLCDDB4 = 9;
+const int PinLCDDB5 = 10;
+const int PinLCDDB6 = 11;
+const int PinLCDDB7 = 12;
+const int PinEncoderClock = 2;
+const int PinEncoderData = 3;
+const int PinButton = 4;
+const int PinBuzzer = 5;
+const int PinLED = 6;
+
+const int LCDWidth = 16;
+const int LCDHeight = 2;
+
+const int EncoderSensitivity = 4;
+const int SmallStep = 1;
+const int LargeStepTreshold = 60;
+const int LargeStep = 10;
+
+const int MenuTimeout = 2000;
 
 
-static const int PinLCDRS = 7;
-static const int PinLCDEN = 8;
-static const int PinLCDDB4 = 9;
-static const int PinLCDDB5 = 10;
-static const int PinLCDDB6 = 11;
-static const int PinLCDDB7 = 12;
-static const int PinEncoderClock = 2;
-static const int PinEncoderData = 3;
-static const int PinButton = 4;
-static const int PinBuzzer = 5;
-static const int PinLED = 6;
+const uint32_t DefaultExposureTime = 60;
+const uint8_t DefaultExposureIntensity = 100;
 
-// You probably don't wanna change these without a proper review of the code, since most of it assumes 16x2 anyways
-static const int LCDWidth = 16;
-static const int LCDHeight = 2;
+const uint8_t LCDCharArrowRight = 0;
+const uint8_t LCDCharArrowLeft = 1;
+const uint8_t LCDCharArrowRightHollow = 2;
+const uint8_t LCDCharArrowLeftHollow = 3;
+const uint8_t LCDCharUpDown = 4;
 
-static const int EncoderSensitivity = 4;
-static const int SmallStep = 1;
-static const int LargeStepTreshold = 60;
-static const int LargeStep = 10;
-
-static const int MenuTimeout = 2000;
-
-
-static const uint8_t LCDCharArrowRight = 0;
-static const uint8_t LCDCharArrowLeft = 1;
-static const uint8_t LCDCharArrowRightHollow = 2;
-static const uint8_t LCDCharArrowLeftHollow = 3;
-static const uint8_t LCDCharUpDown = 4;
-
-extern byte LCDCharArrowRightMap[8];
-extern byte LCDCharArrowLeftMap[8];
-extern byte LCDCharArrowRightHollowMap[8];
-extern byte LCDCharArrowLeftHollowMap[8];
-extern byte LCDCharUpDownMap[8];
+extern uint8_t LCDCharArrowRightMap[8];
+extern uint8_t LCDCharArrowLeftMap[8];
+extern uint8_t LCDCharArrowRightHollowMap[8];
+extern uint8_t LCDCharArrowLeftHollowMap[8];
+extern uint8_t LCDCharUpDownMap[8];
 
 #endif

src/ExposureTimer.cpp

@@ -1,26 +0,0 @@
-#include "ExposureTimer.h"
-#include <EEPROM.h>
-
-unsigned int ExposureTime = 0;
-unsigned long ExposureTimerStart = 0;
-
-void ResetExposureTime()
-{
-  EEPROM.get(0, ExposureTime);
-}
-
-
-void StartExposureTimer(unsigned long currentTime)
-{
-  EEPROM.put(0, ExposureTime);
-  ExposureTimerStart = currentTime;
-}
-
-
-String FormatTime(unsigned int Time)
-{
-  String minutes = String(ExposureTime / 60);
-  String seconds = String(ExposureTime % 60);
-
-  return minutes + ':' + (seconds.length() == 1 ? '0' + seconds : seconds);
-}

src/ExposureTimer.h

@@ -1,15 +0,0 @@
-#ifndef __ExposureTimer
-#define __ExposureTimer
-
-#include "Arduino.h"
-
-extern unsigned int ExposureTime;
-extern unsigned long ExposureTimerStart;
-
-
-void ResetExposureTime();
-void StartExposureTimer(unsigned long currentTime);
-
-String FormatTime(unsigned int Time);
-
-#endif

src/Screen/BaseMenuScreen.cpp

@@ -1,119 +0,0 @@
-#include "Screen/BaseMenuScreen.h"
-#include "Config.h"
-#include "Buzzer.h"
-
-
-void BaseMenuScreen::setEnableMenuScroll(bool value)
-{
-  if (value != mEnableMenuScroll)
-  {
-    mEnableMenuScroll = value;
-    printScrollIndicators();
-  }
-}
-
-
-void BaseMenuScreen::onShow()
-{
-  printTitle();
-  printScrollIndicators();
-  printValue();
-}
-
-
-void BaseMenuScreen::onHide()
-{
-}
-
-
-void BaseMenuScreen::printTitle()
-{
-  LiquidCrystal* display = getDisplay();
-
-  const char* title = getTitle();
-  uint8_t titleLength = strlen(title);
-  uint8_t maxWidth = LCDWidth - 2;
-
-  display->setCursor(1, 0);
-
-  if (titleLength >= maxWidth)
-  {
-    // Title too long, cut off
-    char* character = (char*)title;
-    for (uint8_t i = 0; i < maxWidth; i++)
-    {
-      display->write(byte(*character));
-      character++;
-    }
-  }
-  else
-  {
-    // Center title
-    uint8_t offset = (maxWidth - titleLength) / 2;
-
-    for (uint8_t i = 0; i < offset; i++)
-      display->write(' ');
-
-    display->print(title);
-    offset += titleLength;
-
-    while (offset < LCDWidth - 2)
-    {
-      display->print(' ');
-      offset++;
-    }
-  }
-}
-
-
-void BaseMenuScreen::printScrollIndicators()
-{
-  LiquidCrystal* display = getDisplay();
-
-  display->setCursor(0, 0);
-  if (hasPrevious())
-    display->write(getEnableMenuScroll() ? LCDCharArrowLeft : LCDCharArrowLeftHollow);
-  else
-    display->write(' ');
-
-  display->setCursor(LCDWidth - 1, 0);
-  if (hasNext())
-    display->write(getEnableMenuScroll() ? LCDCharArrowRight : LCDCharArrowRightHollow);
-  else
-    display->write(' ');
-}
-
-
-void BaseMenuScreen::printValue()
-{
-  LiquidCrystal* display = getDisplay();
-
-  display->setCursor(0, 1);
-  for (uint8_t x = 0; x < LCDWidth; x++)
-    display->write(' ');
-}
-
-
-
-void BaseMenuScreen::onEncoder(long lastPosition, long newPosition)
-{
-  if (mEnableMenuScroll)
-  {
-    if (newPosition > lastPosition)
-    {
-      if (hasNext())
-      {
-        buzzSelect();
-        gotoNext();
-      }
-    }
-    else
-    {
-      if (hasPrevious())
-      {
-        buzzSelect();
-        gotoPrevious();
-      }
-    }
-  }
-}

src/Screen/BaseMenuScreen.h

@@ -1,41 +0,0 @@
-#ifndef __BaseMenuScreen
-#define __BaseMenuScreen
-
-#include <stdbool.h>
-#include "ScreenManager.h"
-
-/*
- * Base menu screen
- *   Provides the base for a menu screen, allows scrolling to
- *   the previous or next menu screen or performs an action.
- */
-class BaseMenuScreen : public BaseScreen
-{
-  private:
-    bool mEnableMenuScroll = true;
-
-  protected:
-    bool getEnableMenuScroll() { return mEnableMenuScroll; }
-    void setEnableMenuScroll(bool value);
-
-    virtual bool hasPrevious() = 0;
-    virtual bool hasNext() = 0;
-
-    virtual const char* getTitle() = 0;
-    virtual void gotoPrevious() {}
-    virtual void gotoNext() {}
-
-    void printTitle();
-    void printScrollIndicators();
-    virtual void printValue();
-
-  public:
-    BaseMenuScreen(ScreenManager* screenManager) : BaseScreen(screenManager) { }
-
-    virtual void onShow();
-    virtual void onHide();
-
-    virtual void onEncoder(long lastPosition, long newPosition);
-};
-
-#endif

src/Screen/IntensityScreen.cpp

@@ -1,84 +0,0 @@
-#include "Screen/IntensityScreen.h"
-#include "Screen/SetTimeScreen.h"
-#include "Screen/StartScreen.h"
-#include "ExposureTimer.h"
-#include "Buzzer.h"
-#include "Config.h"
-
-
-void IntensityScreen::printValue()
-{
-  LiquidCrystal* display = getDisplay();
-  display->setCursor(0, 1);
-
-  String intensity = "100%";
-  uint8_t offset = (LCDWidth - intensity.length()) / 2;
-
-  for (uint8_t space = 0; space < offset; space++)
-    display->print(' ');
-
-  display->print(intensity);
-  offset += intensity.length();
-
-  if (getEditMode())
-  {
-    display->write(LCDCharUpDown);
-    offset++;
-  }
-
-  for (uint8_t space = offset; space < LCDWidth; space++)
-    display->print(' ');
-}
-
-
-void IntensityScreen::gotoPrevious()
-{
-  buzzSelect();
-  getScreenManager()->show<SetTimeScreen>();
-}
-
-
-void IntensityScreen::gotoNext()
-{
-  buzzSelect();
-  getScreenManager()->show<StartScreen>();
-}
-
-
-void IntensityScreen::onHide()
-{
-}
-
-
-void IntensityScreen::onButton()
-{
-  buzzSelect();
-  setEditMode(!getEditMode());
-  printValue();
-}
-
-
-void IntensityScreen::onEncoder(long lastPosition, long newPosition)
-{
-  if (getEditMode())
-  {
-    buzzSelect();
-
-/*
-    if (newPosition > lastPosition)
-      ExposureTime += ExposureTime >= LargeStepTreshold ? LargeStep : SmallStep;
-    else if (ExposureTime > 0)
-      ExposureTime -= ExposureTime > LargeStepTreshold ? LargeStep : SmallStep;
-      */
-
-    printValue();
-  }
-  else
-    BaseMenuScreen::onEncoder(lastPosition, newPosition);
-}
-
-
-void IntensityScreen::onTick()
-{
-}
-

src/Screen/IntensityScreen.h

@@ -1,36 +0,0 @@
-#ifndef __IntensityScreen
-#define __IntensityScreen
-
-#include "ScreenManager.h"
-#include "Screen/BaseMenuScreen.h"
-
-/*
- * Intensity screen
- *   Allows changing of the intensity.
- */
-class IntensityScreen : public BaseMenuScreen
-{
-  protected:
-    inline bool getEditMode() { return !getEnableMenuScroll(); }
-    inline void setEditMode(bool value) { setEnableMenuScroll(!value); }
-
-    bool hasPrevious() { return true; }
-    bool hasNext() { return true; }
-
-    const char* getTitle() { return "Intensity"; }
-    void gotoPrevious();
-    void gotoNext();
-
-    void printValue();
-
-  public:
-    IntensityScreen(ScreenManager* screenManager) : BaseMenuScreen(screenManager) { }
-
-    void onHide();
-
-    void onButton();
-    void onEncoder(long lastPosition, long newPosition);
-    void onTick();
-};
-
-#endif

src/Screen/SetTimeScreen.h

@@ -1,35 +0,0 @@
-#ifndef __SetTimeScreen
-#define __SetTimeScreen
-
-#include "ScreenManager.h"
-#include "Screen/BaseMenuScreen.h"
-
-/*
- * Time screen
- *   Allows changing of the exposure time.
- */
-class SetTimeScreen : public BaseMenuScreen
-{
-  protected:
-    inline bool getEditMode() { return !getEnableMenuScroll(); }
-    inline void setEditMode(bool value) { setEnableMenuScroll(!value); }
-
-    bool hasPrevious() { return false; }
-    bool hasNext() { return true; }
-
-    const char* getTitle() { return "Time"; }
-    void gotoNext();
-
-    void printValue();
-
-  public:
-    SetTimeScreen(ScreenManager* screenManager) : BaseMenuScreen(screenManager) { }
-
-    void onHide();
-
-    void onButton();
-    void onEncoder(long lastPosition, long newPosition);
-    void onTick();
-};
-
-#endif

src/Screen/StartScreen.cpp

@@ -1,30 +0,0 @@
-#include "Screen/StartScreen.h"
-#include "Screen/IntensityScreen.h"
-#include "ExposureTimer.h"
-#include "Buzzer.h"
-#include "Config.h"
-
-
-void StartScreen::gotoPrevious()
-{
-  buzzSelect();
-  getScreenManager()->show<IntensityScreen>();
-}
-
-
-void StartScreen::onHide()
-{
-}
-
-
-void StartScreen::onButton()
-{
-  buzzSelect();
-  //setEditMode(!getEditMode());
-}
-
-
-void StartScreen::onTick()
-{
-}
-

src/Screen/StartScreen.h

@@ -1,29 +0,0 @@
-#ifndef __StartScreen
-#define __StartScreen
-
-#include "ScreenManager.h"
-#include "Screen/BaseMenuScreen.h"
-
-/*
- * Start screen
- *   Allows starting the exposure.
- */
-class StartScreen : public BaseMenuScreen
-{
-  protected:
-    bool hasPrevious() { return true; }
-    bool hasNext() { return false; }
-
-    const char* getTitle() { return "Start"; }
-    void gotoPrevious();
-
-  public:
-    StartScreen(ScreenManager* screenManager) : BaseMenuScreen(screenManager) { }
-
-    void onHide();
-
-    void onButton();
-    void onTick();
-};
-
-#endif

src/display.cpp

@@ -0,0 +1,23 @@
+#include "display.h"
+#include "config.h"
+
+
+void LCDPrintLine(LiquidCrystal* display, uint8_t y, char* value, uint8_t margin)
+{
+
+}
+
+
+void LCDPrintLineCentered(LiquidCrystal* display, uint8_t y, char* value, uint8_t margin)
+{
+
+}
+
+
+const char* FormatTime(unsigned int time)
+{
+  String minutes = String(time / 60);
+  String seconds = String(time % 60);
+
+  return (minutes + ':' + (seconds.length() == 1 ? '0' + seconds : seconds)).c_str();
+}

src/display.h

@@ -0,0 +1,13 @@
+#ifndef __display
+#define __display
+
+#include <Arduino.h>
+#include <LiquidCrystal.h>
+
+
+void LCDPrintLine(LiquidCrystal* display, uint8_t y, const char* value, uint8_t margin = 0);
+void LCDPrintLineCentered(LiquidCrystal* display, uint8_t y, const char* value, uint8_t margin = 0);
+
+const char* FormatTime(unsigned int time);
+
+#endif

src/main.cpp

@@ -2,20 +2,20 @@
 #include <Bounce2.h>
 #include <Encoder.h>
 #include <LiquidCrystal.h>
-#include "Config.h"
-#include "ScreenManager.h"
-#include "Screen/SetTimeScreen.h"
-#include "Buzzer.h"
-#include "ExposureTimer.h"
+#include "config.h"
+#include "screen.h"
+#include "screen/menu.h"
+#include "buzzer.h"
+#include "state.h"
 
 
 LiquidCrystal lcd(PinLCDRS, PinLCDEN, PinLCDDB4, PinLCDDB5, PinLCDDB6, PinLCDDB7);
 
 
-// Before uploading the sketch, upload it once with ClearEEPROM defined to
-// zero out the memory.
-//#define ClearEEPROM
-#ifndef ClearEEPROM
+// Before uploading the sketch, upload it once with ResetEEPROM defined to
+// write the default values to the EEPROM
+//#define ResetEEPROM
+#ifndef ResetEEPROM
 
 ScreenManager* screenManager;
 unsigned long currentTime;
@@ -34,7 +34,7 @@ void setup()
   button.attach(PinButton);
   button.interval(5);
 
-  ResetExposureTime();
+  LoadSettings();
 
   lcd.createChar(LCDCharArrowRight, LCDCharArrowRightMap);
   lcd.createChar(LCDCharArrowLeft, LCDCharArrowLeftMap);
@@ -44,9 +44,9 @@ void setup()
   lcd.begin(LCDWidth, LCDHeight);
 
   screenManager = new ScreenManager(&lcd, &currentTime);
-  screenManager->show<SetTimeScreen>();
+  screenManager->show<MenuScreen>();
 
-  buzzStartup();
+  Buzzer::startup();
 }
 
 
@@ -89,16 +89,21 @@ void setup()
 
   for (int i = 0 ; i < EEPROM.length() ; i++)
   {
-    EEPROM.write(i, 0);
+    EEPROM.update(i, 0);
   }
 
+  ExposureTime = DefaultExposureTime;
+  ExposureIntensity = DefaultExposureIntensity;
+  SaveSettings();
+
   lcd.setCursor(0, 0);
   lcd.print("Memory cleared");
 
-  buzzMemoryCleared();
+  Buzzer::memoryCleared();
 }
 
 void loop()
 {
 }
+
 #endif

src/menu/intensity.cpp

@@ -0,0 +1,46 @@
+#include "intensity.h"
+
+/*
+  LiquidCrystal* display = getDisplay();
+  display->setCursor(0, 1);
+
+  String intensity = "100%";
+  uint8_t offset = (LCDWidth - intensity.length()) / 2;
+
+  for (uint8_t space = 0; space < offset; space++)
+    display->print(' ');
+
+  display->print(intensity);
+  offset += intensity.length();
+
+  if (getEditMode())
+  {
+    display->write(LCDCharUpDown);
+    offset++;
+  }
+
+  for (uint8_t space = offset; space < LCDWidth; space++)
+    display->print(' ');
+
+*/
+
+char* IntensityMenuItem::getTitle()
+{
+  return NULL;
+}
+
+
+char* IntensityMenuItem::getValue()
+{
+  return NULL;
+}
+
+
+void IntensityMenuItem::incValue()
+{
+}
+
+
+void IntensityMenuItem::decValue()
+{
+}

src/menu/intensity.h

@@ -0,0 +1,20 @@
+#ifndef __intensitymenuitem
+#define __intensitymenuitem
+
+#include "screen/menu.h"
+
+class IntensityMenuItem : public MenuItem
+{
+  public:
+    IntensityMenuItem() : MenuItem() { }
+
+    char* getTitle();
+    char* getValue();
+
+    bool editable() { return true; }
+
+    void incValue();
+    void decValue();
+};
+
+#endif

src/menu/time.cpp

@@ -1,74 +1,54 @@
-#include "Screen/SetTimeScreen.h"
-#include "Screen/IntensityScreen.h"
-#include "ExposureTimer.h"
-#include "Buzzer.h"
-#include "Config.h"
-
-
-void SetTimeScreen::printValue()
-{
-  LiquidCrystal* display = getDisplay();
-  display->setCursor(0, 1);
-
-  String time = FormatTime(ExposureTime);
-  uint8_t offset = (LCDWidth - time.length()) / 2;
-
-  for (uint8_t space = 0; space < offset; space++)
-    display->print(' ');
-
-  display->print(time);
-  offset += time.length();
-
-  if (getEditMode())
-  {
-    display->write(LCDCharUpDown);
-    offset++;
-  }
-
-  for (uint8_t space = offset; space < LCDWidth; space++)
-    display->print(' ');
-}
-
-
-void SetTimeScreen::gotoNext()
-{
-  buzzSelect();
-  getScreenManager()->show<IntensityScreen>();
-}
-
-
-void SetTimeScreen::onHide()
-{
-}
-
-
-void SetTimeScreen::onButton()
-{
-  buzzSelect();
-  setEditMode(!getEditMode());
-  printValue();
-}
-
-
-void SetTimeScreen::onEncoder(long lastPosition, long newPosition)
-{
-  if (getEditMode())
-  {
-    buzzSelect();
-
-    if (newPosition > lastPosition)
-      ExposureTime += ExposureTime >= LargeStepTreshold ? LargeStep : SmallStep;
-    else if (ExposureTime > 0)
-      ExposureTime -= ExposureTime > LargeStepTreshold ? LargeStep : SmallStep;
-
-    printValue();
-  }
-  else
-    BaseMenuScreen::onEncoder(lastPosition, newPosition);
-}
-
-
-void SetTimeScreen::onTick()
-{
-}
-
+#include "time.h"
+
+/*
+  LiquidCrystal* display = getDisplay();
+  display->setCursor(0, 1);
+
+  String time = FormatTime(ExposureTime);
+  uint8_t offset = (LCDWidth - time.length()) / 2;
+
+  for (uint8_t space = 0; space < offset; space++)
+    display->print(' ');
+
+  display->print(time);
+  offset += time.length();
+
+  if (getEditMode())
+  {
+    display->write(LCDCharUpDown);
+    offset++;
+  }
+
+  for (uint8_t space = offset; space < LCDWidth; space++)
+    display->print(' ');
+
+
+
+
+
+    if (newPosition > lastPosition)
+      ExposureTime += ExposureTime >= LargeStepTreshold ? LargeStep : SmallStep;
+    else if (ExposureTime > 0)
+      ExposureTime -= ExposureTime > LargeStepTreshold ? LargeStep : SmallStep;
+*/
+
+char* TimeMenuItem::getTitle()
+{
+  return NULL;
+}
+
+
+char* TimeMenuItem::getValue()
+{
+  return NULL;
+}
+
+
+void TimeMenuItem::incValue()
+{
+}
+
+
+void TimeMenuItem::decValue()
+{
+}

src/menu/time.h

@@ -0,0 +1,20 @@
+#ifndef __timemenuitem
+#define __timemenuitem
+
+#include "screen/menu.h"
+
+class TimeMenuItem : public MenuItem
+{
+  public:
+    TimeMenuItem() : MenuItem() { }
+
+    char* getTitle();
+    char* getValue();
+
+    bool editable() { return true; }
+
+    void incValue();
+    void decValue();
+};
+
+#endif

src/screen.cpp

@@ -1,5 +1,5 @@
-#include "ScreenManager.h"
-#include "Config.h"
+#include "screen.h"
+#include "config.h"
 
 
 ScreenManager* BaseScreen::getScreenManager()

src/screen.h

@@ -1,9 +1,8 @@
-#ifndef __ScreenManager
-#define __ScreenManager
+#ifndef __screen
+#define __screen
 
 #include <LiquidCrystal.h>
 
-
 class ScreenManager;
 
 

src/screen/countdown.cpp

@@ -1,28 +1,27 @@
-#include "CountdownScreen.h"
-#include "Screen/SetTimeScreen.h"
-#include "ExposureTimer.h"
-#include "Config.h"
-#include "Buzzer.h"
+#include "countdown.h"
+#include "screen/menu.h"
+#include "display.h"
+#include "state.h"
+#include "config.h"
+#include "buzzer.h"
 
 
 void CountdownScreen::printRemainingTime()
 {
-  getDisplay()->setCursor(0, 1);
-  String time = FormatTime(ExposureTime - ((getCurrentTime() - ExposureTimerStart) / 1000));
+  const char* time = FormatTime(ExposureTime - ((getCurrentTime() - ExposureTimerStart) / 1000));
 
   // TODO blank out, center, etc
-  getDisplay()->print(time);
+  LCDPrintLineCentered(getDisplay(), 1, time);
 }
 
 
 void CountdownScreen::onShow()
 {
-  mLastDisplayed = -1;
-
-  getDisplay()->setCursor(0, 0);
-  getDisplay()->print("Exposing...     ");
+  mLastDisplayed = (uint32_t)-1;
 
+  LCDPrintLine(getDisplay(), 0, "Exposing...");
   printRemainingTime();
+
   digitalWrite(PinLED, HIGH);
 }
 
@@ -36,8 +35,8 @@ void CountdownScreen::onHide()
 void CountdownScreen::onButton()
 {
   // TODO Confirmation?
-  buzzClick();
-  getScreenManager()->show<SetTimeScreen>();
+  Buzzer::click();
+  getScreenManager()->show<MenuScreen>();
 }
 
 
@@ -49,7 +48,7 @@ void CountdownScreen::onEncoder(long lastPosition, long newPosition)
 
 void CountdownScreen::onTick()
 {
-  long elapsed = (getCurrentTime() - ExposureTimerStart) / 1000;
+  uint32_t elapsed = (getCurrentTime() - ExposureTimerStart) / 1000;
 
   if (elapsed >= ExposureTime)
   {
@@ -59,10 +58,10 @@ void CountdownScreen::onTick()
     printRemainingTime();
     digitalWrite(PinLED, LOW);
 
-    buzzCompleted();
+    Buzzer::completed();
 
     ExposureTimerStart = 0;
-    getScreenManager()->show<SetTimeScreen>();
+    getScreenManager()->show<MenuScreen>();
   }
   else if (elapsed != mLastDisplayed)
   {

src/screen/countdown.h

@@ -1,7 +1,7 @@
-#ifndef __CountdownScreen
-#define __CountdownScreen
+#ifndef __countdown
+#define __countdown
 
-#include "ScreenManager.h"
+#include "screen.h"
 
 /*
  * Countdown screen
@@ -10,7 +10,7 @@
 class CountdownScreen : public BaseScreen
 {
   private:
-    int mLastDisplayed;
+    uint32_t mLastDisplayed;
 
   protected:
     void printRemainingTime();

src/screen/menu.cpp

@@ -0,0 +1,151 @@
+#include "screen/menu.h"
+#include "config.h"
+#include "buzzer.h"
+
+#include "menu/time.h"
+
+
+MenuScreen::MenuScreen(ScreenManager* screenManager) : BaseScreen(screenManager)
+{
+  mCount = 3;
+  mItems = new MenuItem*[mCount];
+
+  mItems[0] = new TimeMenuItem();
+  mItems[1] = new TimeMenuItem();
+  mItems[2] = new TimeMenuItem();
+}
+
+
+MenuScreen::~MenuScreen()
+{
+  for (uint8_t i = 0; i < mCount; i++)
+    delete mItems[i];
+
+  delete[] mItems;
+}
+
+
+void MenuScreen::onShow()
+{
+  printFullUpdate();
+}
+
+
+void MenuScreen::onHide()
+{
+}
+
+
+void MenuScreen::printFullUpdate()
+{
+  printTitle();
+  printScrollIndicators();
+  printValue();
+}
+
+
+void MenuScreen::printTitle()
+{
+  LiquidCrystal* display = getDisplay();
+
+  const char* title = mItems[mSelected]->getTitle();
+  uint8_t titleLength = strlen(title);
+  uint8_t maxWidth = LCDWidth - 2;
+
+  display->setCursor(1, 0);
+
+  if (titleLength >= maxWidth)
+  {
+    // Title too long, cut off
+    char* character = (char*)title;
+    for (uint8_t i = 0; i < maxWidth; i++)
+    {
+      display->write(byte(*character));
+      character++;
+    }
+  }
+  else
+  {
+    // Center title
+    uint8_t offset = (maxWidth - titleLength) / 2;
+
+    for (uint8_t i = 0; i < offset; i++)
+      display->write(' ');
+
+    display->print(title);
+    offset += titleLength;
+
+    while (offset < LCDWidth - 2)
+    {
+      display->print(' ');
+      offset++;
+    }
+  }
+}
+
+
+void MenuScreen::printScrollIndicators()
+{
+  LiquidCrystal* display = getDisplay();
+
+  display->setCursor(0, 0);
+  if (mSelected > 0)
+    display->write(mEditing ? LCDCharArrowLeftHollow : LCDCharArrowLeft);
+  else
+    display->write(' ');
+
+  display->setCursor(LCDWidth - 1, 0);
+  if (mSelected < mCount - 1)
+    display->write(mEditing ? LCDCharArrowRightHollow : LCDCharArrowRight);
+  else
+    display->write(' ');
+}
+
+
+void MenuScreen::printValue()
+{
+  LiquidCrystal* display = getDisplay();
+
+  display->setCursor(0, 1);
+  for (uint8_t x = 0; x < LCDWidth; x++)
+    display->write(' ');
+}
+
+
+
+void MenuScreen::onButton()
+{
+}
+
+
+void MenuScreen::onEncoder(long lastPosition, long newPosition)
+{
+  if (!mEditing)
+  {
+    if (newPosition > lastPosition)
+    {
+      if (mSelected < mCount - 1)
+      {
+        Buzzer::select();
+        mSelected++;
+
+        printFullUpdate();
+      }
+    }
+    else
+    {
+      if (mSelected > 0)
+      {
+        Buzzer::select();
+        mSelected--;
+
+        printFullUpdate();
+      }
+    }
+  }
+}
+
+
+void MenuScreen::onTick()
+{
+}

src/screen/menu.h

@@ -0,0 +1,51 @@
+#ifndef __menuscreen
+#define __menuscreen
+
+#include "screen.h"
+
+class MenuItem
+{
+  public:
+    virtual ~MenuItem() { }
+
+    virtual char* getTitle() = 0;
+    virtual char* getValue() { return NULL; }
+
+    virtual bool editable() { return false; }
+
+    // Editable = true
+    virtual void incValue() { }
+    virtual void decValue() { }
+
+    // Editable = false
+    virtual void execute(ScreenManager* screenManager) { }
+};
+
+class MenuScreen : public BaseScreen
+{
+  private:
+    uint8_t mCount;
+    MenuItem** mItems;
+    uint8_t mSelected = 0;
+    bool mEditing = false;
+
+  protected:
+    void printFullUpdate();
+
+    void printTitle();
+    void printScrollIndicators();
+    void printValue();
+
+  public:
+    MenuScreen(ScreenManager* screenManager);
+    ~MenuScreen();
+
+    void onShow();
+    void onHide();
+
+    void onButton();
+    void onEncoder(long lastPosition, long newPosition);
+    void onTick();
+};
+
+#endif

src/state.cpp

@@ -0,0 +1,34 @@
+#include "state.h"
+#include "config.h"
+#include <EEPROM.h>
+
+uint32_t ExposureTime = DefaultExposureTime;
+uint8_t ExposureIntensity = DefaultExposureIntensity;
+uint32_t ExposureTimerStart = 0;
+
+
+void LoadSettings()
+{
+  uint16_t offset = 0;
+  EEPROM.get(offset, ExposureTime);
+  offset += sizeof(ExposureTime);
+
+  EEPROM.get(offset, ExposureIntensity);
+}
+
+
+void SaveSettings()
+{
+  uint16_t offset = 0;
+  EEPROM.put(offset, ExposureTime);
+  offset += sizeof(ExposureTime);
+
+  EEPROM.put(offset, ExposureIntensity);
+}
+
+
+void StartExposureTimer(unsigned long currentTime)
+{
+  SaveSettings();
+  ExposureTimerStart = currentTime;
+}

src/state.h

@@ -0,0 +1,17 @@
+#ifndef __state
+#define __state
+
+#include <Arduino.h>
+
+extern uint32_t ExposureTime;
+extern uint8_t ExposureIntensity;
+
+extern uint32_t ExposureTimerStart;
+
+
+void LoadSettings();
+void SaveSettings();
+
+void StartExposureTimer(unsigned long currentTime);
+
+#endif