Resolved conflicts

2026-01-18 16:27:34 +01:00 · 2019-12-24 01:07:22 +01:00
parent ce621f0a1b 588c05f6b4
commit a159d80b1c
62 changed files with 478 additions and 290 deletions
--- a/.github/workflows/ci-workflow.yml
+++ b/.github/workflows/ci-workflow.yml
@@ -14,7 +14,8 @@ jobs:
  build-device-n0100:
    runs-on: ubuntu-latest
    steps:
-      - run: sudo apt-get install binutils-arm-none-eabi build-essential gcc-arm-none-eabi imagemagick libfreetype6-dev libjpeg-dev libpng-dev pkg-config
+      - run: sudo apt-get install build-essential imagemagick libfreetype6-dev libjpeg-dev libpng-dev pkg-config
+      - uses: numworks/setup-arm-toolchain@v1
      - uses: actions/checkout@v1
      - run: make -j2 MODEL=n0100 epsilon.dfu
      - run: make -j2 MODEL=n0100 epsilon.onboarding.dfu
@@ -30,7 +31,8 @@ jobs:
  build-device-n0110:
    runs-on: ubuntu-latest
    steps:
-      - run: sudo apt-get install binutils-arm-none-eabi build-essential gcc-arm-none-eabi imagemagick libfreetype6-dev libjpeg-dev libpng-dev pkg-config
+      - run: sudo apt-get install build-essential imagemagick libfreetype6-dev libjpeg-dev libpng-dev pkg-config
+      - uses: numworks/setup-arm-toolchain@v1
      - uses: actions/checkout@v1
      - run: make -j2 epsilon.dfu
      - run: make -j2 epsilon.onboarding.dfu
--- a/apps/Makefile
+++ b/apps/Makefile
@@ -92,6 +92,10 @@ $(call object_for,$(all_app_src)): $(BUILD_DIR)/python/port/genhdr/qstrdefs.gene

 apps_tests_src = $(app_calculation_test_src) $(app_probability_test_src) $(app_regression_test_src) $(app_sequence_test_src) $(app_shared_test_src) $(app_statistics_test_src) $(app_solver_test_src)

+apps_tests_src += $(addprefix apps/,\
+  global_preferences.cpp \
+)
+
 # Configure variants
 apps_all_src = $(app_src)
 apps_all_src += $(apps_launch_default_src) $(apps_launch_on_boarding_src
--- a/apps/apps_container.cpp
+++ b/apps/apps_container.cpp
@@ -201,8 +201,8 @@ bool AppsContainer::processEvent(Ion::Events::Event event) {
  // Warning: if the window is dirtied, you need to call window()->redraw()
  if (event == Ion::Events::USBPlug) {
    if (Ion::USB::isPlugged()) {
-      if (GlobalPreferences::sharedGlobalPreferences()->examMode()) {
-        displayExamModePopUp(false);
+      if (GlobalPreferences::sharedGlobalPreferences()->isInExamMode()) {
+        displayExamModePopUp(GlobalPreferences::ExamMode::Off);
        window()->redraw();
      } else {
        Ion::USB::enable();
@@ -251,8 +251,8 @@ void AppsContainer::run() {
   * and it is visible when reflashing a N0100 (there is some noise on the
   * screen before the logo appears). */
  Ion::Display::pushRectUniform(screenRect, KDColorWhite);
-  if (GlobalPreferences::sharedGlobalPreferences()->examMode()) {
-    activateExamMode();
+  if (GlobalPreferences::sharedGlobalPreferences()->isInExamMode()) {
+    activateExamMode(GlobalPreferences::sharedGlobalPreferences()->examMode());
  }
  refreshPreferences();

@@ -313,8 +313,8 @@ void AppsContainer::reloadTitleBarView() {
  m_window.reloadTitleBarView();
 }

-void AppsContainer::displayExamModePopUp(bool activate) {
-  m_examPopUpController.setActivatingExamMode(activate);
+void AppsContainer::displayExamModePopUp(GlobalPreferences::ExamMode mode) {
+  m_examPopUpController.setTargetExamMode(mode);
  s_activeApp->displayModalViewController(&m_examPopUpController, 0.f, 0.f, Metric::ExamPopUpTopMargin, Metric::PopUpRightMargin, Metric::ExamPopUpBottomMargin, Metric::PopUpLeftMargin);
 }

@@ -329,7 +329,7 @@ void AppsContainer::shutdownDueToLowBattery() {
  }
  while (Ion::Battery::level() == Ion::Battery::Charge::EMPTY) {
    Ion::Backlight::setBrightness(0);
-    if (!GlobalPreferences::sharedGlobalPreferences()->examMode()) {
+    if (!GlobalPreferences::sharedGlobalPreferences()->isInExamMode()) {
      /* Unless the LED is lit up for the exam mode, switch off the LED. IF the
       * low battery event happened during the Power-On Self-Test, a LED might
       * have stayed lit up. */
@@ -362,7 +362,8 @@ void AppsContainer::redrawWindow(bool force) {
  m_window.redraw(force);
 }

-void AppsContainer::activateExamMode() {
+void AppsContainer::activateExamMode(GlobalPreferences::ExamMode examMode) {
+  assert(examMode == GlobalPreferences::ExamMode::Standard || examMode == GlobalPreferences::ExamMode::Dutch);
  reset();
  Preferences * preferences = Preferences::sharedPreferences();
  switch ((int)preferences->colorOfLED()) {
@@ -379,6 +380,14 @@ void AppsContainer::activateExamMode() {
      Ion::LED::setColor(KDColorYellow);
      break;
  }
+  /* The Dutch exam mode LED is supposed to be orange but we can only make
+   * blink "pure" colors: with RGB leds on or off (as the PWM is used for
+   * blinking). The closest "pure" color is Yellow. Moreover, Orange LED is
+   * already used when the battery is charging. Using yellow, we can assert
+   * that the yellow LED only means that Dutch exam mode is on and avoid
+   * confusing states when the battery is charging and states when the Dutch
+   * exam mode is on. */
+  // Ion::LED::setColor(examMode == GlobalPreferences::ExamMode::Dutch ? KDColorYellow : KDColorRed);
  Ion::LED::setBlinking(1000, 0.1f);
 }

--- a/apps/apps_container.h
+++ b/apps/apps_container.h
@@ -13,6 +13,7 @@
 #include "exam_pop_up_controller_delegate.h"
 #include "battery_timer.h"
 #include "suspend_timer.h"
+#include "global_preferences.h"
 #include "backlight_dimming_timer.h"
 #include "shared/global_context.h"
 #include "on_boarding/pop_up_controller.h"
@@ -41,12 +42,12 @@ public:
  bool updateBatteryState();
  void refreshPreferences();
  void reloadTitleBarView();
-  void displayExamModePopUp(bool activate);
+  void displayExamModePopUp(GlobalPreferences::ExamMode mode);
  void shutdownDueToLowBattery();
  void setShiftAlphaStatus(Ion::Events::ShiftAlphaStatus newStatus);
  OnBoarding::PopUpController * promptController();
  void redrawWindow(bool force = false);
-  void activateExamMode();
+  void activateExamMode(GlobalPreferences::ExamMode examMode);
  // Exam pop-up controller delegate
  void examDeactivatingPopUpIsDismissed() override;
  // Ion::StorageDelegate
--- a/apps/calculation/calculation.cpp
+++ b/apps/calculation/calculation.cpp
@@ -1,5 +1,6 @@
 #include "calculation.h"
 #include "../shared/poincare_helpers.h"
+#include "../global_preferences.h"
 #include <poincare/exception_checkpoint.h>
 #include <poincare/undefined.h>
 #include <poincare/unreal.h>
@@ -123,7 +124,9 @@ Calculation::DisplayOutput Calculation::displayOutput(Context * context) {
  }
  if (shouldOnlyDisplayExactOutput()) {
    m_displayOutput = DisplayOutput::ExactOnly;
-  } else if (input().recursivelyMatches(
+  // Force all results to be ApproximateOnly in Dutch exam mode
+  } else if (GlobalPreferences::sharedGlobalPreferences()->examMode() == GlobalPreferences::ExamMode::Dutch ||
+      input().recursivelyMatches(
        [](const Expression e, Context * c) {
          constexpr int approximateOnlyTypesCount = 9;
          /* If the input contains the following types, we only display the
--- a/apps/exam_pop_up_controller.cpp
+++ b/apps/exam_pop_up_controller.cpp
@@ -10,14 +10,14 @@ using namespace Poincare;
 ExamPopUpController::ExamPopUpController(ExamPopUpControllerDelegate * delegate) :
  ViewController(nullptr),
  m_contentView(this),
-  m_isActivatingExamMode(false),
+  m_targetExamMode(GlobalPreferences::ExamMode::Unknown),
  m_delegate(delegate)
 {
 }

-void ExamPopUpController::setActivatingExamMode(bool activatingExamMode) {
-  m_isActivatingExamMode = activatingExamMode;
-  m_contentView.setMessages(activatingExamMode);
+void ExamPopUpController::setTargetExamMode(GlobalPreferences::ExamMode mode) {
+  m_targetExamMode = mode;
+  m_contentView.setMessagesForExamMode(mode);
 }

 View * ExamPopUpController::view() {
@@ -25,7 +25,7 @@ View * ExamPopUpController::view() {
 }

 void ExamPopUpController::viewDidDisappear() {
-  if (m_isActivatingExamMode == false) {
+  if (m_targetExamMode == GlobalPreferences::ExamMode::Off) {
    m_delegate->examDeactivatingPopUpIsDismissed();
  }
 }
@@ -53,13 +53,15 @@ ExamPopUpController::ContentView::ContentView(Responder * parentResponder) :
  }, parentResponder), KDFont::SmallFont),
  m_okButton(parentResponder, I18n::Message::Ok, Invocation([](void * context, void * sender) {
    ExamPopUpController * controller = (ExamPopUpController *)context;
-    GlobalPreferences::sharedGlobalPreferences()->setExamMode(controller->isActivatingExamMode());
+    GlobalPreferences::ExamMode mode = controller->targetExamMode();
+    assert(mode != GlobalPreferences::ExamMode::Unknown);
+    GlobalPreferences::sharedGlobalPreferences()->setExamMode(mode);
    AppsContainer * container = AppsContainer::sharedAppsContainer();
-    if (controller->isActivatingExamMode()) {
-      container->activateExamMode();
-    } else {
+    if (mode == GlobalPreferences::ExamMode::Off) {
      Ion::LED::setColor(KDColorBlack);
      Ion::LED::updateColorWithPlugAndCharge();
+    } else {
+      container->activateExamMode(mode);
    }
    container->refreshPreferences();
    Container::activeApp()->dismissModalViewController();
@@ -89,15 +91,20 @@ int ExamPopUpController::ContentView::selectedButton() {
  return 1;
 }

-void ExamPopUpController::ContentView::setMessages(bool activingExamMode) {
-  if (activingExamMode) {
+void ExamPopUpController::ContentView::setMessagesForExamMode(GlobalPreferences::ExamMode mode) {
+  if (mode == GlobalPreferences::ExamMode::Off) {
+    m_messageTextView1.setMessage(I18n::Message::ExitExamMode1);
+    m_messageTextView2.setMessage(I18n::Message::ExitExamMode2);
+    m_messageTextView3.setMessage(I18n::Message::Default);
+  } else if (mode == GlobalPreferences::ExamMode::Standard) {
    m_messageTextView1.setMessage(I18n::Message::ActiveExamModeMessage1);
    m_messageTextView2.setMessage(I18n::Message::ActiveExamModeMessage2);
    m_messageTextView3.setMessage(I18n::Message::ActiveExamModeMessage3);
  } else {
-    m_messageTextView1.setMessage(I18n::Message::ExitExamMode1);
-    m_messageTextView2.setMessage(I18n::Message::ExitExamMode2);
-    m_messageTextView3.setMessage(I18n::Message::Default);
+    assert(mode == GlobalPreferences::ExamMode::Dutch);
+    m_messageTextView1.setMessage(I18n::Message::ActiveDutchExamModeMessage1);
+    m_messageTextView2.setMessage(I18n::Message::ActiveDutchExamModeMessage2);
+    m_messageTextView3.setMessage(I18n::Message::ActiveDutchExamModeMessage3);
  }
 }

--- a/apps/exam_pop_up_controller.h
+++ b/apps/exam_pop_up_controller.h
@@ -3,6 +3,7 @@

 #include <escher.h>
 #include "exam_pop_up_controller_delegate.h"
+#include "global_preferences.h"

 class HighContrastButton : public Button {
 public:
@@ -13,8 +14,8 @@ public:
 class ExamPopUpController : public ViewController {
 public:
  ExamPopUpController(ExamPopUpControllerDelegate * delegate);
-  void setActivatingExamMode(bool activingExamMode);
-  bool isActivatingExamMode() const { return m_isActivatingExamMode; }
+  void setTargetExamMode(GlobalPreferences::ExamMode mode);
+  GlobalPreferences::ExamMode targetExamMode() const { return m_targetExamMode; }
  // View Controller
  View * view() override;
  void viewDidDisappear() override;
@@ -28,7 +29,7 @@ private:
    void drawRect(KDContext * ctx, KDRect rect) const override;
    void setSelectedButton(int selectedButton);
    int selectedButton();
-    void setMessages(bool activingExamMode);
+    void setMessagesForExamMode(GlobalPreferences::ExamMode mode);
  private:
    constexpr static KDCoordinate k_buttonMargin = 10;
    constexpr static KDCoordinate k_buttonHeight = 20;
@@ -45,7 +46,7 @@ private:
    MessageTextView m_messageTextView3;
  };
  ContentView m_contentView;
-  bool m_isActivatingExamMode;
+  GlobalPreferences::ExamMode m_targetExamMode;
  ExamPopUpControllerDelegate * m_delegate;
 };

--- a/apps/global_preferences.cpp
+++ b/apps/global_preferences.cpp
@@ -5,20 +5,26 @@ GlobalPreferences * GlobalPreferences::sharedGlobalPreferences() {
  return &globalPreferences;
 }

-bool GlobalPreferences::examMode() const {
+GlobalPreferences::ExamMode GlobalPreferences::examMode() const {
  if (m_examMode == ExamMode::Unknown) {
-    m_examMode = (ExamMode)Ion::ExamMode::FetchExamMode();
+    uint8_t mode = Ion::ExamMode::FetchExamMode();
+    assert(mode >= 0 && mode < 3); // mode can be cast in ExamMode (Off, Standard or Dutch)
+    m_examMode = (ExamMode)mode;
  }
-  assert((int)m_examMode == 0 || (int)m_examMode == 1);
-  return (bool)m_examMode;
+  return m_examMode;
 }

-void GlobalPreferences::setExamMode(bool activateExamMode) {
-  if (((bool)examMode()) == activateExamMode) {
+void GlobalPreferences::setExamMode(ExamMode mode) {
+  ExamMode currentMode = examMode();
+  if (currentMode == mode) {
    return;
  }
-  Ion::ExamMode::ToggleExamMode();
-  m_examMode = (ExamMode)activateExamMode;
+  assert(mode != ExamMode::Unknown);
+  int8_t deltaMode = (int8_t)mode - (int8_t)currentMode;
+  deltaMode = deltaMode < 0 ? deltaMode + 3 : deltaMode;
+  assert(deltaMode > 0);
+  Ion::ExamMode::IncrementExamMode(deltaMode);
+  m_examMode = mode;
 }

 void GlobalPreferences::setBrightnessLevel(int brightnessLevel) {
--- a/apps/global_preferences.h
+++ b/apps/global_preferences.h
@@ -5,11 +5,18 @@

 class GlobalPreferences {
 public:
+  enum class ExamMode : int8_t {
+    Unknown = -1,
+    Off = 0,
+    Standard = 1,
+    Dutch = 2
+  };
  static GlobalPreferences * sharedGlobalPreferences();
  I18n::Language language() const { return m_language; }
  void setLanguage(I18n::Language language) { m_language = language; }
-  bool examMode() const;
-  void setExamMode(bool activateExamMode);
+  bool isInExamMode() const { return (int8_t)examMode() > 0; }
+  ExamMode examMode() const;
+  void setExamMode(ExamMode examMode);
  bool showPopUp() const { return m_showPopUp; }
  void setShowPopUp(bool showPopUp) { m_showPopUp = showPopUp; }
  int brightnessLevel() const { return m_brightnessLevel; }
@@ -22,13 +29,8 @@ private:
    m_showPopUp(true),
    m_brightnessLevel(Ion::Backlight::MaxBrightness) {}
  I18n::Language m_language;
-  enum class ExamMode : uint8_t {
-    Deactivate = 0,
-    Activate = 1,
-    Unknown = 2
-  };
-  static_assert((uint8_t)GlobalPreferences::ExamMode::Deactivate == 0, "GlobalPreferences::setExamMode and examMode() are not right");
-  static_assert((uint8_t)GlobalPreferences::ExamMode::Activate == 1, "GlobalPreferences::setExamMode and examMode() are not right");
+  static_assert((int8_t)GlobalPreferences::ExamMode::Off == 0, "GlobalPreferences::isInExamMode() is not right");
+  static_assert((int8_t)GlobalPreferences::ExamMode::Unknown < 0, "GlobalPreferences::isInExamMode() is not right");
  mutable ExamMode m_examMode;
  bool m_showPopUp;
  int m_brightnessLevel;
--- a/apps/home/base.de.i18n
+++ b/apps/home/base.de.i18n
@@ -1,2 +1,5 @@
 Apps = "Anwendungen"
 AppsCapital = "OMEGA"
+AppsCapital = "ANWENDUNGEN"
+ForbidenAppInExamMode1 = "This application is"
+ForbidenAppInExamMode2 = "forbidden in exam mode"
--- a/apps/home/base.en.i18n
+++ b/apps/home/base.en.i18n
@@ -1,2 +1,5 @@
 Apps = "Applications"
 AppsCapital = "OMEGA"
+AppsCapital = "APPLICATIONS"
+ForbidenAppInExamMode1 = "This application is"
+ForbidenAppInExamMode2 = "forbidden in exam mode"
--- a/apps/home/base.es.i18n
+++ b/apps/home/base.es.i18n
@@ -1,2 +1,5 @@
 Apps = "Aplicaciones"
 AppsCapital = "OMEGA"
+AppsCapital = "APLICACIONES"
+ForbidenAppInExamMode1 = "This application is"
+ForbidenAppInExamMode2 = "forbidden in exam mode"
--- a/apps/home/base.fr.i18n
+++ b/apps/home/base.fr.i18n
@@ -1,2 +1,5 @@
 Apps = "Applications"
 AppsCapital = "OMEGA"
+AppsCapital = "APPLICATIONS"
+ForbidenAppInExamMode1 = "This application is"
+ForbidenAppInExamMode2 = "forbidden in exam mode"
--- a/apps/home/base.pt.i18n
+++ b/apps/home/base.pt.i18n
@@ -1,2 +1,5 @@
 Apps = "Aplicações"
 AppsCapital = "OMEGA"
+AppsCapital = "APLICAÇÕES"
+ForbidenAppInExamMode1 = "This application is"
+ForbidenAppInExamMode2 = "forbidden in exam mode"
--- a/apps/home/controller.cpp
+++ b/apps/home/controller.cpp
@@ -58,9 +58,14 @@ Controller::Controller(Responder * parentResponder, SelectableTableViewDataSourc
 bool Controller::handleEvent(Ion::Events::Event event) {
  if (event == Ion::Events::OK || event == Ion::Events::EXE) {
    AppsContainer * container = AppsContainer::sharedAppsContainer();
-    bool switched = container->switchTo(container->appSnapshotAtIndex(selectionDataSource()->selectedRow()*k_numberOfColumns+selectionDataSource()->selectedColumn()+1));
-    assert(switched);
-    (void) switched; // Silence compilation warning about unused variable.
+    ::App::Snapshot * selectedSnapshot = container->appSnapshotAtIndex(selectionDataSource()->selectedRow()*k_numberOfColumns+selectionDataSource()->selectedColumn()+1);
+    if (GlobalPreferences::sharedGlobalPreferences()->examMode() == GlobalPreferences::ExamMode::Dutch && selectedSnapshot->descriptor()->name() == I18n::Message::CodeApp) {
+      App::app()->displayWarning(I18n::Message::ForbidenAppInExamMode1, I18n::Message::ForbidenAppInExamMode2);
+    } else {
+      bool switched = container->switchTo(selectedSnapshot);
+      assert(switched);
+      (void) switched; // Silence compilation warning about unused variable.
+    }
    return true;
  }

--- a/apps/on_boarding/logo_controller.cpp
+++ b/apps/on_boarding/logo_controller.cpp
@@ -49,8 +49,8 @@ void LogoController::viewDidDisappear() {
    Ion::LED::setColor(m_previousLEDColor);
    /* TODO: instead of setting again the exam mode, put the previous led color
     * AND BLINKING.*/
-    if (GlobalPreferences::sharedGlobalPreferences()->examMode()) {
-      AppsContainer::sharedAppsContainer()->activateExamMode();
+    if (GlobalPreferences::sharedGlobalPreferences()->isInExamMode()) {
+      AppsContainer::sharedAppsContainer()->activateExamMode(GlobalPreferences::sharedGlobalPreferences()->examMode());
    }
  }
  ViewController::viewDidDisappear();
--- a/apps/on_boarding/power_on_self_test.cpp
+++ b/apps/on_boarding/power_on_self_test.cpp
@@ -20,7 +20,7 @@ KDColor PowerOnSelfTest::Perform() {
      resultColor = KDColorRed;
    }
  } else {
-    resultColor = KDColorBlue;
+    resultColor = KDColorPurple;
  }
  Ion::LED::setColor(resultColor);
  return previousLEDColor;
--- a/apps/settings/base.de.i18n
+++ b/apps/settings/base.de.i18n
@@ -9,6 +9,7 @@ ComplexFormat = "Komplex"
 ExamMode = "Testmodus"
 ActivateExamMode = "Starten Testmodus"
 ExamModeActive = "Wieder starten Testmodus"
+ActivateDutchExamMode = "Activate Dutch exam mode"
 About = "Über"
 Degrees = "Grad "
 Gradians = "Gone "
--- a/apps/settings/base.en.i18n
+++ b/apps/settings/base.en.i18n
@@ -9,6 +9,7 @@ ComplexFormat = "Complex format"
 ExamMode = "Exam mode"
 ActivateExamMode = "Activate exam mode"
 ExamModeActive = "Reactivate exam mode"
+ActivateDutchExamMode = "Activate Dutch exam mode"
 About = "About"
 Degrees = "Degrees "
 Gradians = "Gradians "
--- a/apps/settings/base.es.i18n
+++ b/apps/settings/base.es.i18n
@@ -9,6 +9,7 @@ ComplexFormat = "Forma compleja"
 ExamMode = "Modo examen"
 ActivateExamMode = "Activar el modo examen"
 ExamModeActive = "Reactivar el modo examen"
+ActivateDutchExamMode = "Activate Dutch exam mode"
 About = "Acerca"
 Degrees = "Grados "
 Gradians = "Gradianes "
--- a/apps/settings/base.fr.i18n
+++ b/apps/settings/base.fr.i18n
@@ -9,6 +9,7 @@ ComplexFormat = "Forme complexe"
 ExamMode = "Mode examen"
 ActivateExamMode = "Activer le mode examen"
 ExamModeActive = "Réactiver le mode examen"
+ActivateDutchExamMode = "Activate Dutch exam mode"
 About = "À propos"
 Degrees = "Degrés "
 Gradians = "Grades "
--- a/apps/settings/base.pt.i18n
+++ b/apps/settings/base.pt.i18n
@@ -9,6 +9,7 @@ ComplexFormat = "Complexos"
 ExamMode = "Modo de exame"
 ActivateExamMode = "Ativar o modo de exame"
 ExamModeActive = "Reativar o modo de exame"
+ActivateDutchExamMode = "Activate Dutch exam mode"
 About = "Acerca"
 Degrees = "Graus "
 Gradians = "Grados "
--- a/apps/settings/main_controller_prompt_beta.cpp
+++ b/apps/settings/main_controller_prompt_beta.cpp
@@ -14,7 +14,7 @@ constexpr SettingsMessageTree s_symbolChildren[4] = {SettingsMessageTree(I18n::M

 //sub-menus
 constexpr SettingsMessageTree s_modelMathOptionsChildren[5] = {SettingsMessageTree(I18n::Message::AngleUnit, s_modelAngleChildren, 3), SettingsMessageTree(I18n::Message::DisplayMode, s_modelFloatDisplayModeChildren, 4), SettingsMessageTree(I18n::Message::EditionMode, s_modelEditionModeChildren, 2), SettingsMessageTree(I18n::Message::ComplexFormat, s_modelComplexFormatChildren, 3), SettingsMessageTree(I18n::Message::SymbolMultiplication, s_symbolChildren, 4)};
-constexpr SettingsMessageTree s_modelExamChildren[3] = {SettingsMessageTree(I18n::Message::LEDColor, s_ledColorChildren, 4), SettingsMessageTree(I18n::Message::SymbolicEnabled), SettingsMessageTree(I18n::Message::ActivateExamMode)};
+constexpr SettingsMessageTree s_modelExamChildren[3] = {SettingsMessageTree(I18n::Message::LEDColor, s_ledColorChildren, 4), SettingsMessageTree(I18n::Message::SymbolicEnabled), SettingsMessageTree(I18n::Message::ActivateExamMode), SettingsMessageTree(I18n::Message::ActivateDutchExamMode)};
 constexpr SettingsMessageTree s_accessibilityChildren[6] = {SettingsMessageTree(I18n::Message::AccessibilityInvertColors), SettingsMessageTree(I18n::Message::AccessibilityMagnify),SettingsMessageTree(I18n::Message::AccessibilityGamma),SettingsMessageTree(I18n::Message::AccessibilityGammaRed),SettingsMessageTree(I18n::Message::AccessibilityGammaGreen),SettingsMessageTree(I18n::Message::AccessibilityGammaBlue)};
 #ifdef USERNAME
 constexpr SettingsMessageTree s_modelAboutChildren[7] = {SettingsMessageTree(I18n::Message::Username), SettingsMessageTree(I18n::Message::SoftwareVersion), SettingsMessageTree(I18n::Message::CustomSoftwareVersion), SettingsMessageTree(I18n::Message::MicroPythonVersion), SettingsMessageTree(I18n::Message::SerialNumber), SettingsMessageTree(I18n::Message::FccId), SettingsMessageTree(I18n::Message::Contributors, s_contributorsChildren, 5)};
@@ -26,7 +26,7 @@ constexpr SettingsMessageTree s_modelMenu[] =
  {SettingsMessageTree(I18n::Message::MathOptions, s_modelMathOptionsChildren, 5),
    SettingsMessageTree(I18n::Message::Brightness),
    SettingsMessageTree(I18n::Message::Language),
-    SettingsMessageTree(I18n::Message::ExamMode, s_modelExamChildren, 3),
+    SettingsMessageTree(I18n::Message::ExamMode, s_modelExamChildren, 4),
    SettingsMessageTree(I18n::Message::BetaPopUp),
    SettingsMessageTree(I18n::Message::Accessibility, s_accessibilityChildren, 6),
 #ifdef USERNAME
--- a/apps/settings/main_controller_prompt_none.cpp
+++ b/apps/settings/main_controller_prompt_none.cpp
@@ -15,7 +15,7 @@ constexpr SettingsMessageTree s_symbolChildren[4] = {SettingsMessageTree(I18n::M

 //sub-menus
 constexpr SettingsMessageTree s_modelMathOptionsChildren[5] = {SettingsMessageTree(I18n::Message::AngleUnit, s_modelAngleChildren, 3), SettingsMessageTree(I18n::Message::DisplayMode, s_modelFloatDisplayModeChildren, 4), SettingsMessageTree(I18n::Message::EditionMode, s_modelEditionModeChildren, 2), SettingsMessageTree(I18n::Message::ComplexFormat, s_modelComplexFormatChildren, 3), SettingsMessageTree(I18n::Message::SymbolMultiplication, s_symbolChildren, 4)};
-constexpr SettingsMessageTree s_modelExamChildren[3] = {SettingsMessageTree(I18n::Message::LEDColor, s_ledColorChildren, 4), SettingsMessageTree(I18n::Message::SymbolicEnabled), SettingsMessageTree(I18n::Message::ActivateExamMode)};
+constexpr SettingsMessageTree s_modelExamChildren[3] = {SettingsMessageTree(I18n::Message::LEDColor, s_ledColorChildren, 4), SettingsMessageTree(I18n::Message::SymbolicEnabled), SettingsMessageTree(I18n::Message::ActivateExamMode), SettingsMessageTree(I18n::Message::ActivateDutchExamMode)};
 constexpr SettingsMessageTree s_accessibilityChildren[6] = {SettingsMessageTree(I18n::Message::AccessibilityInvertColors), SettingsMessageTree(I18n::Message::AccessibilityMagnify),SettingsMessageTree(I18n::Message::AccessibilityGamma),SettingsMessageTree(I18n::Message::AccessibilityGammaRed),SettingsMessageTree(I18n::Message::AccessibilityGammaGreen),SettingsMessageTree(I18n::Message::AccessibilityGammaBlue)};
 #ifdef USERNAME
 constexpr SettingsMessageTree s_modelAboutChildren[7] = {SettingsMessageTree(I18n::Message::Username), SettingsMessageTree(I18n::Message::SoftwareVersion), SettingsMessageTree(I18n::Message::CustomSoftwareVersion), SettingsMessageTree(I18n::Message::MicroPythonVersion), SettingsMessageTree(I18n::Message::SerialNumber), SettingsMessageTree(I18n::Message::FccId), SettingsMessageTree(I18n::Message::Contributors, s_contributorsChildren, 5)};
@@ -27,7 +27,7 @@ constexpr SettingsMessageTree s_modelMenu[] =
  {SettingsMessageTree(I18n::Message::MathOptions, s_modelMathOptionsChildren, 5),
    SettingsMessageTree(I18n::Message::Brightness),
    SettingsMessageTree(I18n::Message::Language),
-    SettingsMessageTree(I18n::Message::ExamMode, s_modelExamChildren, 3),
+    SettingsMessageTree(I18n::Message::ExamMode, s_modelExamChildren, 4),
    SettingsMessageTree(I18n::Message::Accessibility, s_accessibilityChildren, 6),
 #ifdef USERNAME
    SettingsMessageTree(I18n::Message::About, s_modelAboutChildren, 7)};
--- a/apps/settings/main_controller_prompt_update.cpp
+++ b/apps/settings/main_controller_prompt_update.cpp
@@ -14,7 +14,7 @@ constexpr SettingsMessageTree s_symbolChildren[4] = {SettingsMessageTree(I18n::M

 //sub-menus
 constexpr SettingsMessageTree s_modelMathOptionsChildren[5] = {SettingsMessageTree(I18n::Message::AngleUnit, s_modelAngleChildren, 3), SettingsMessageTree(I18n::Message::DisplayMode, s_modelFloatDisplayModeChildren, 4), SettingsMessageTree(I18n::Message::EditionMode, s_modelEditionModeChildren, 2), SettingsMessageTree(I18n::Message::ComplexFormat, s_modelComplexFormatChildren, 3), SettingsMessageTree(I18n::Message::SymbolMultiplication, s_symbolChildren, 4)};
-constexpr SettingsMessageTree s_modelExamChildren[3] = {SettingsMessageTree(I18n::Message::LEDColor, s_ledColorChildren, 4), SettingsMessageTree(I18n::Message::SymbolicEnabled), SettingsMessageTree(I18n::Message::ActivateExamMode)};
+constexpr SettingsMessageTree s_modelExamChildren[3] = {SettingsMessageTree(I18n::Message::LEDColor, s_ledColorChildren, 4), SettingsMessageTree(I18n::Message::SymbolicEnabled), SettingsMessageTree(I18n::Message::ActivateExamMode), SettingsMessageTree(I18n::Message::ActivateDutchExamMode)};
 constexpr SettingsMessageTree s_accessibilityChildren[6] = {SettingsMessageTree(I18n::Message::AccessibilityInvertColors), SettingsMessageTree(I18n::Message::AccessibilityMagnify),SettingsMessageTree(I18n::Message::AccessibilityGamma),SettingsMessageTree(I18n::Message::AccessibilityGammaRed),SettingsMessageTree(I18n::Message::AccessibilityGammaGreen),SettingsMessageTree(I18n::Message::AccessibilityGammaBlue)};
 #ifdef USERNAME
 constexpr SettingsMessageTree s_modelAboutChildren[7] = {SettingsMessageTree(I18n::Message::Username), SettingsMessageTree(I18n::Message::SoftwareVersion), SettingsMessageTree(I18n::Message::CustomSoftwareVersion), SettingsMessageTree(I18n::Message::MicroPythonVersion), SettingsMessageTree(I18n::Message::SerialNumber), SettingsMessageTree(I18n::Message::FccId), SettingsMessageTree(I18n::Message::Contributors, s_contributorsChildren, 5)};
@@ -26,7 +26,7 @@ constexpr SettingsMessageTree s_modelMenu[] =
  {SettingsMessageTree(I18n::Message::MathOptions, s_modelMathOptionsChildren, 5),
    SettingsMessageTree(I18n::Message::Brightness),
    SettingsMessageTree(I18n::Message::Language),
-    SettingsMessageTree(I18n::Message::ExamMode, s_modelExamChildren, 3),
+    SettingsMessageTree(I18n::Message::ExamMode, s_modelExamChildren, 4),
    SettingsMessageTree(I18n::Message::UpdatePopUp),
    SettingsMessageTree(I18n::Message::Accessibility, s_accessibilityChildren, 6),
 #ifdef USERNAME
--- a/apps/settings/sub_menu/exam_mode_controller.cpp
+++ b/apps/settings/sub_menu/exam_mode_controller.cpp
@@ -1,6 +1,7 @@
 #include "exam_mode_controller.h"
 #include "../../global_preferences.h"
 #include "../../apps_container.h"
+#include <apps/i18n.h>
 #include <assert.h>
 #include <cmath>
 #include <poincare/preferences.h>
@@ -17,17 +18,31 @@ ExamModeController::ExamModeController(Responder * parentResponder) :
  m_examModeCell(I18n::Message::Default, KDFont::LargeFont),
  m_ledCell(KDFont::LargeFont, KDFont::SmallFont),
  m_symbolicCell(I18n::Message::SymbolicEnabled, KDFont::LargeFont)
+  m_cell{MessageTableCell(I18n::Message::ExamModeActive, KDFont::LargeFont), MessageTableCell(I18n::Message::ActivateDutchExamMode, KDFont::LargeFont)}
 {
 }

-void ExamModeController::didEnterResponderChain(Responder * previousFirstResponder) {
-  m_selectableTableView.reloadData();
+int ExamModeController::initialSelectedRow() const {
+  int row = selectedRow();
+  if (row >= numberOfRows()) {
+    return numberOfRows()-1;
+  } else if (row < 0) {
+    return 0;
+  }
+  return row;
 }

 bool ExamModeController::handleEvent(Ion::Events::Event event) {
  I18n::Message childLabel = m_messageTreeModel->children(selectedRow())->label();
  if (event == Ion::Events::OK || event == Ion::Events::EXE || event == Ion::Events::Right) {
-    if (GlobalPreferences::sharedGlobalPreferences()->examMode()) {
+    if (GlobalPreferences::sharedGlobalPreferences()->isInExamMode()) {
+      // If the exam mode is already on, this re-activate the same exam mode
+      mode = GlobalPreferences::sharedGlobalPreferences()->examMode();
+      if (childLabel == I18n::Message::ActivateExamMode || childLabel == I18n::Message::ExamModeActive)
+        AppsContainer::sharedAppsContainer()->displayExamModePopUp(true);
+      return true;
+    } else if (childLabel == I18n::Message::ActivateDutchExamMode) {
+      mode = GlobalPreferences::ExamMode::Dutch
      if (childLabel == I18n::Message::ActivateExamMode || childLabel == I18n::Message::ExamModeActive)
        AppsContainer::sharedAppsContainer()->displayExamModePopUp(true);
      return true;
@@ -53,6 +68,13 @@ bool ExamModeController::handleEvent(Ion::Events::Event event) {
  return GenericSubController::handleEvent(event);
 }

+int ExamModeController::numberOfRows() const {
+  if (GlobalPreferences::sharedGlobalPreferences()->language() != I18n::Language::EN || GlobalPreferences::sharedGlobalPreferences()->isInExamMode()) {
+    return 1;
+  }
+  return GenericSubController::numberOfRows();
+}
+
 HighlightCell * ExamModeController::reusableCell(int index, int type) {
  assert(index == 0);
  if (type == 0) {
@@ -76,14 +98,21 @@ int ExamModeController::reusableCellCount(int type) {
      assert(false);
      return 0;
  }
+  /*assert(type == 0);
+  assert(index >= 0 && index < k_maxNumberOfCells);
+  return &m_cell[index];*/
 }

+/*int ExamModeController::reusableCellCount(int type) {
+  return k_maxNumberOfCells;
+}*/
+
 void ExamModeController::willDisplayCellForIndex(HighlightCell * cell, int index) {
  Preferences * preferences = Preferences::sharedPreferences();
  GenericSubController::willDisplayCellForIndex(cell, index);
  I18n::Message thisLabel = m_messageTreeModel->children(index)->label();

-  if (GlobalPreferences::sharedGlobalPreferences()->examMode() && (thisLabel == I18n::Message::ActivateExamMode || thisLabel == I18n::Message::ExamModeActive)) {
+  if (GlobalPreferences::sharedGlobalPreferences()->isInExamMode() && (thisLabel == I18n::Message::ActivateExamMode || thisLabel == I18n::Message::ExamModeActive)) {
    MessageTableCell * myCell = (MessageTableCell *)cell;
    myCell->setMessage(I18n::Message::ExamModeActive);
  }
--- a/apps/settings/sub_menu/exam_mode_controller.h
+++ b/apps/settings/sub_menu/exam_mode_controller.h
@@ -9,17 +9,23 @@ namespace Settings {
 class ExamModeController : public GenericSubController {
 public:
  ExamModeController(Responder * parentResponder);
-  void didEnterResponderChain(Responder * previousFirstResponder) override;
  bool handleEvent(Ion::Events::Event event) override;
+  int numberOfRows() const override;
  HighlightCell * reusableCell(int index, int type) override;
  int reusableCellCount(int type) override;
  void willDisplayCellForIndex(HighlightCell * cell, int index) override;
  int typeAtLocation(int i, int j) override;
 private:
+<<<<<<< HEAD
  MessageTableCell m_examModeCell;
  MessageTableCellWithChevronAndMessage m_ledCell;
  PreferencesController m_preferencesController;
  MessageTableCellWithSwitch m_symbolicCell;
+=======
+  int initialSelectedRow() const override;
+  static constexpr int k_maxNumberOfCells = 2;
+  MessageTableCell m_cell[k_maxNumberOfCells];
+>>>>>>> upstream/master
 };

 }
--- a/apps/settings/sub_menu/generic_sub_controller.cpp
+++ b/apps/settings/sub_menu/generic_sub_controller.cpp
@@ -26,8 +26,12 @@ View * GenericSubController::view() {
  return &m_selectableTableView;
 }

+void GenericSubController::didEnterResponderChain(Responder * previousFirstResponder) {
+  selectCellAtLocation(0, initialSelectedRow());
+  m_selectableTableView.reloadData();
+}
+
 void GenericSubController::didBecomeFirstResponder() {
-  selectCellAtLocation(0, 0);
  Container::activeApp()->setFirstResponder(&m_selectableTableView);
 }

@@ -75,10 +79,6 @@ void GenericSubController::setMessageTreeModel(const MessageTree * messageTreeMo
  m_messageTreeModel = (MessageTree *)messageTreeModel;
 }

-void GenericSubController::viewWillAppear() {
-  m_selectableTableView.reloadData();
-}
-
 void GenericSubController::viewDidDisappear() {
  m_selectableTableView.deselectTable();
 }
--- a/apps/settings/sub_menu/generic_sub_controller.h
+++ b/apps/settings/sub_menu/generic_sub_controller.h
@@ -11,6 +11,7 @@ public:
  GenericSubController(Responder * parentResponder);
  const char * title() override;
  View * view() override;
+  void didEnterResponderChain(Responder * previousFirstResponder) override;
  void didBecomeFirstResponder() override;
  bool handleEvent(Ion::Events::Event event) override;
  int numberOfRows() const override;
@@ -20,10 +21,10 @@ public:
  virtual int typeAtLocation(int i, int j) override;
  void willDisplayCellForIndex(HighlightCell * cell, int index) override;
  void setMessageTreeModel(const MessageTree * messageTreeModel);
-  void viewWillAppear() override;
  void viewDidDisappear() override;
 protected:
  StackViewController * stackController() const;
+  virtual int initialSelectedRow() const { return 0; }
  constexpr static KDCoordinate k_topBottomMargin = 13;
  SelectableTableView m_selectableTableView;
  MessageTree * m_messageTreeModel;
--- a/apps/settings/sub_menu/preferences_controller.cpp
+++ b/apps/settings/sub_menu/preferences_controller.cpp
@@ -23,7 +23,6 @@ PreferencesController::PreferencesController(Responder * parentResponder) :
 }

 void PreferencesController::didBecomeFirstResponder() {
-  selectCellAtLocation(0, valueIndexForPreference(m_messageTreeModel->label()));
  Container::activeApp()->setFirstResponder(&m_selectableTableView);
 }

@@ -188,7 +187,7 @@ void PreferencesController::setPreferenceWithValueIndex(I18n::Message message, i
  }
 }

-int PreferencesController::valueIndexForPreference(I18n::Message message) {
+int PreferencesController::valueIndexForPreference(I18n::Message message) const {
  Preferences * preferences = Preferences::sharedPreferences();
  if (message == I18n::Message::AngleUnit) {
    return (int)preferences->angleUnit();
--- a/apps/settings/sub_menu/preferences_controller.h
+++ b/apps/settings/sub_menu/preferences_controller.h
@@ -18,9 +18,10 @@ protected:
  constexpr static int k_totalNumberOfCell = 4;
 private:
  constexpr static const KDFont * k_layoutFont = KDFont::SmallFont;
+  int initialSelectedRow() const override { return valueIndexForPreference(m_messageTreeModel->label()); }
  Poincare::Layout layoutForPreferences(I18n::Message message);
  void setPreferenceWithValueIndex(I18n::Message message, int valueIndex);
-  int valueIndexForPreference(I18n::Message message);
+  int valueIndexForPreference(I18n::Message message) const;
  MessageTableCellWithExpression m_cells[k_totalNumberOfCell];
 };

--- a/apps/shared.de.i18n
+++ b/apps/shared.de.i18n
@@ -2,6 +2,9 @@ ActivateDeactivate = "Aktivieren/Deaktivieren"
 ActiveExamModeMessage1 = "Alle Ihre Daten werden "
 ActiveExamModeMessage2 = "gelöscht, wenn Sie den "
 ActiveExamModeMessage3 = "Testmodus einschalten."
+ActiveDutchExamModeMessage1 = "All your data will be deleted when"
+ActiveDutchExamModeMessage2 = "you activate the exam mode. Python"
+ActiveDutchExamModeMessage3 = "application will be unavailable."
 Axis = "Achsen"
 Cancel = "Abbrechen"
 ClearColumn = "Spalte löschen"
--- a/apps/shared.en.i18n
+++ b/apps/shared.en.i18n
@@ -2,6 +2,9 @@ ActivateDeactivate = "Turn on/off"
 ActiveExamModeMessage1 = "All your data will be "
 ActiveExamModeMessage2 = "deleted when you activate "
 ActiveExamModeMessage3 = "the exam mode."
+ActiveDutchExamModeMessage1 = "All your data will be deleted when"
+ActiveDutchExamModeMessage2 = "you activate the exam mode. Python"
+ActiveDutchExamModeMessage3 = "application will be unavailable."
 Axis = "Axes"
 Cancel = "Cancel"
 ClearColumn = "Clear column"
--- a/apps/shared.es.i18n
+++ b/apps/shared.es.i18n
@@ -2,6 +2,9 @@ ActivateDeactivate = "Activar/Desactivar"
 ActiveExamModeMessage1 = "Todos sus datos se "
 ActiveExamModeMessage2 = "eliminaran al activar "
 ActiveExamModeMessage3 = "el modo examen."
+ActiveDutchExamModeMessage1 = "All your data will be deleted when"
+ActiveDutchExamModeMessage2 = "you activate the exam mode. Python"
+ActiveDutchExamModeMessage3 = "application will be unavailable."
 Axis = "Ejes"
 Cancel = "Cancelar"
 ClearColumn = "Borrar la columna"
--- a/apps/shared.fr.i18n
+++ b/apps/shared.fr.i18n
@@ -2,6 +2,9 @@ ActivateDeactivate = "Activer/Désactiver"
 ActiveExamModeMessage1 = "Toutes vos données seront "
 ActiveExamModeMessage2 = "supprimées si vous activez "
 ActiveExamModeMessage3 = "le mode examen."
+ActiveDutchExamModeMessage1 = "All your data will be deleted when"
+ActiveDutchExamModeMessage2 = "you activate the exam mode. Python"
+ActiveDutchExamModeMessage3 = "application will be unavailable."
 Axis = "Axes"
 Cancel = "Annuler"
 ClearColumn = "Effacer la colonne"
--- a/apps/shared.pt.i18n
+++ b/apps/shared.pt.i18n
@@ -2,6 +2,9 @@ ActivateDeactivate = "Activar/Desactivar"
 ActiveExamModeMessage1 = "Todos os seus dados serão "
 ActiveExamModeMessage2 = "apagados se você ligar "
 ActiveExamModeMessage3 = "o modo de exame."
+ActiveDutchExamModeMessage1 = "All your data will be deleted when"
+ActiveDutchExamModeMessage2 = "you activate the exam mode. Python"
+ActiveDutchExamModeMessage3 = "application will be unavailable."
 Axis = "Eixos"
 Cancel = "Cancelar"
 ClearColumn = "Excluir coluna"
--- a/apps/solver/equation_store.cpp
+++ b/apps/solver/equation_store.cpp
@@ -1,6 +1,7 @@
 #include "equation_store.h"
 #include "../constant.h"
 #include "../shared/poincare_helpers.h"
+#include "../global_preferences.h"
 #include <limits.h>

 #include <poincare/constant.h>
@@ -193,6 +194,8 @@ EquationStore::Error EquationStore::exactSolve(Poincare::Context * context) {
    }
  }
  // Create the results' layouts
+  // In Dutch exam mode, display only approximate solutions
+  bool forbidExactSolutions = GlobalPreferences::sharedGlobalPreferences()->examMode() == GlobalPreferences::ExamMode::Dutch;
  int solutionIndex = 0;
  int initialNumberOfSolutions = m_numberOfSolutions <= k_maxNumberOfExactSolutions ? m_numberOfSolutions : -1;
  // We iterate through the solutions and the potential delta
@@ -211,7 +214,9 @@ EquationStore::Error EquationStore::exactSolve(Poincare::Context * context) {
      char approximateBuffer[::Constant::MaxSerializedExpressionSize];
      m_exactSolutionExactLayouts[solutionIndex].serializeForParsing(exactBuffer, ::Constant::MaxSerializedExpressionSize);
      m_exactSolutionApproximateLayouts[solutionIndex].serializeForParsing(approximateBuffer, ::Constant::MaxSerializedExpressionSize);
-      m_exactSolutionIdentity[solutionIndex] = strcmp(exactBuffer, approximateBuffer) == 0;
+      /* Cheat: declare exact and approximate solutions to be identical in
+       * Dutch exam mode to display only the approximate solutions. */
+      m_exactSolutionIdentity[solutionIndex] = forbidExactSolutions || strcmp(exactBuffer, approximateBuffer) == 0;
      if (!m_exactSolutionIdentity[solutionIndex]) {
        char buffer[::Constant::MaxSerializedExpressionSize];
        m_exactSolutionEquality[solutionIndex] = exactSolutions[i].isEqualToItsApproximationLayout(exactSolutionsApproximations[i], buffer, ::Constant::MaxSerializedExpressionSize, preferences->complexFormat(), preferences->angleUnit(), preferences->displayMode(), preferences->numberOfSignificantDigits(), context);
--- a/apps/title_bar_view.cpp
+++ b/apps/title_bar_view.cpp
@@ -71,7 +71,7 @@ void TitleBarView::layoutSubviews() {
  m_preferenceView.setFrame(KDRect(Metric::TitleBarExternHorizontalMargin, 0, m_preferenceView.minimalSizeForOptimalDisplay().width(), bounds().height()));
  KDSize batterySize = m_batteryView.minimalSizeForOptimalDisplay();
  m_batteryView.setFrame(KDRect(bounds().width() - batterySize.width() - Metric::TitleBarExternHorizontalMargin, (bounds().height()- batterySize.height())/2, batterySize));
-  if (GlobalPreferences::sharedGlobalPreferences()->examMode()) {
+  if (GlobalPreferences::sharedGlobalPreferences()->isInExamMode()) {
    m_examModeIconView.setFrame(KDRect(k_examIconMargin, (bounds().height() - k_examIconHeight)/2, k_examIconWidth, k_examIconHeight));
  } else {
    m_examModeIconView.setFrame(KDRectZero);
--- a/build/targets.device.mak
+++ b/build/targets.device.mak
@@ -60,22 +60,3 @@ $(BUILD_DIR)/bench.flash.$(EXE): LDSCRIPT = ion/src/$(PLATFORM)/$(MODEL)/interna
 bench_src = $(ion_xip_src) $(liba_src) $(kandinsky_src) $(poincare_src) $(libaxx_src) $(app_shared_src) $(ion_target_device_bench_src)
 $(BUILD_DIR)/bench.ram.$(EXE): $(call object_for,$(bench_src))
 $(BUILD_DIR)/bench.flash.$(EXE): $(call object_for,$(bench_src))
-
-.PHONY: %.two_binaries
-%.two_binaries: %.elf
-	@echo "Building an internal and an external binary for     $<"
-	$(Q) $(OBJCOPY) -O binary -j .text.external -j .rodata.external -j .exam_mode_buffer $< $(basename $<).external.bin
-	$(Q) $(OBJCOPY) -O binary -R .text.external -R .rodata.external -R .exam_mode_buffer $< $(basename $<).internal.bin
-	@echo "Padding $(basename $<).external.bin and $(basename $<).internal.bin"
-	$(Q) printf "\xFF\xFF\xFF\xFF" >> $(basename $<).external.bin
-	$(Q) printf "\xFF\xFF\xFF\xFF" >> $(basename $<).internal.bin
-
-.PHONY: binpack
-binpack: $(BUILD_DIR)/flasher.light.bin $(BUILD_DIR)/epsilon.onboarding.two_binaries
-	rm -rf $(BUILD_DIR)/binpack
-	mkdir -p $(BUILD_DIR)/binpack
-	cp $(BUILD_DIR)/flasher.light.bin $(BUILD_DIR)/binpack
-	cp $(BUILD_DIR)/epsilon.onboarding.internal.bin $(BUILD_DIR)/epsilon.onboarding.external.bin $(BUILD_DIR)/binpack
-	cd $(BUILD_DIR) && for binary in flasher.light.bin epsilon.onboarding.internal.bin epsilon.onboarding.external.bin; do shasum -a 256 -b binpack/$${binary} > binpack/$${binary}.sha256;done
-	cd $(BUILD_DIR) && tar cvfz binpack-$(MODEL)-`git rev-parse HEAD | head -c 7`.tgz binpack/*
-
--- a/build/targets.device.n0110.mak
+++ b/build/targets.device.n0110.mak
@@ -19,3 +19,31 @@ $(BUILD_DIR)/test.external_flash.write.$(EXE): $(BUILD_DIR)/quiz/src/test_ion_ex
 	    sleep 2; \
 	fi
 	$(Q) $(PYTHON) build/device/dfu.py -u $(word 1,$^)
+
+.PHONY: %.two_binaries
+%.two_binaries: %.elf
+	@echo "Building an internal and an external binary for     $<"
+	$(Q) $(OBJCOPY) -O binary -j .text.external -j .rodata.external -j .exam_mode_buffer $(BUILD_DIR)/$< $(BUILD_DIR)/$(basename $<).external.bin
+	$(Q) $(OBJCOPY) -O binary -R .text.external -R .rodata.external -R .exam_mode_buffer $(BUILD_DIR)/$< $(BUILD_DIR)/$(basename $<).internal.bin
+	@echo "Padding $(basename $<).external.bin and $(basename $<).internal.bin"
+	$(Q) printf "\xFF\xFF\xFF\xFF" >> $(basename $<).external.bin
+	$(Q) printf "\xFF\xFF\xFF\xFF" >> $(basename $<).internal.bin
+
+.PHONY: binpack
+binpack:
+	rm -rf build/binpack
+	mkdir -p build/binpack
+	make clean
+	make -j8 $(BUILD_DIR)/flasher.light.bin
+	cp $(BUILD_DIR)/flasher.light.bin build/binpack
+	make clean
+	make -j8 $(BUILD_DIR)/bench.flash.bin
+	make -j8 $(BUILD_DIR)/bench.ram.bin
+	cp $(BUILD_DIR)/bench.ram.bin $(BUILD_DIR)/bench.flash.bin build/binpack
+	make clean
+	make -j8 $(BUILD_DIR)/epsilon.onboarding.update.two_binaries
+	cp $(BUILD_DIR)/epsilon.onboarding.update.internal.bin $(BUILD_DIR)/epsilon.onboarding.update.external.bin build/binpack
+	make clean
+	cd build && for binary in flasher.light.bin bench.flash.bin bench.ram.bin epsilon.onboarding.internal.bin epsilon.onboarding.external.bin; do shasum -a 256 -b binpack/$${binary} > binpack/$${binary}.sha256;done
+	cd build && tar cvfz binpack-`git rev-parse HEAD | head -c 7`.tgz binpack
+	rm -rf build/binpack
--- a/escher/include/escher/responder.h
+++ b/escher/include/escher/responder.h
@@ -5,16 +5,17 @@

 class Responder {
 public:
-  Responder(Responder * parentResponder);
+  Responder(Responder * parentResponder) : m_parentResponder(parentResponder) {}
  virtual bool handleEvent(Ion::Events::Event event) { return false; }; // Default implementation does nothing
-  virtual void didBecomeFirstResponder();
-  virtual void willResignFirstResponder();
-  virtual void didEnterResponderChain(Responder * previousFirstResponder);
-  virtual void willExitResponderChain(Responder * nextFirstResponder);
-  Responder * parentResponder() const;
+  virtual void didBecomeFirstResponder() {}
+  virtual void willResignFirstResponder() {}
+  virtual void didEnterResponderChain(Responder * previousFirstResponder) {}
+  virtual void willExitResponderChain(Responder * nextFirstResponder) {}
+  Responder * parentResponder() const { return m_parentResponder; }
  Responder * commonAncestorWith(Responder * responder);
-  void setParentResponder(Responder * responder);
+  void setParentResponder(Responder * responder) { m_parentResponder = responder; }
 private:
+  bool hasAncestor(Responder * responder) const;
  Responder * m_parentResponder;
 };

--- a/escher/src/responder.cpp
+++ b/escher/src/responder.cpp
@@ -2,62 +2,29 @@
 #include <escher/container.h>
 #include <assert.h>

-Responder::Responder(Responder * parentResponder) :
-  m_parentResponder(parentResponder)
-{
-}
-
-Responder * Responder::parentResponder() const {
-  return m_parentResponder;
-}
-
-void Responder::setParentResponder(Responder * responder) {
-  m_parentResponder = responder;
-}
-
-void Responder::didBecomeFirstResponder() {
-}
-
-void Responder::willResignFirstResponder() {
-}
-
-void Responder::didEnterResponderChain(Responder * previousFirstResponder) {
-}
-
-void Responder::willExitResponderChain(Responder * nextFirstResponder) {
-}

 Responder * Responder::commonAncestorWith(Responder * responder) {
  if (responder == nullptr) {
    return nullptr;
  }
-  if (this == responder) {
-    return this;
+  Responder * p = this;
+  while (p != nullptr) {
+    if (responder->hasAncestor(p)) {
+      return p;
+    }
+    p = p->parentResponder();
  }
-  Responder * rootResponder = this;
-  while (rootResponder->parentResponder() != responder && rootResponder->parentResponder() != nullptr) {
-    rootResponder = rootResponder->parentResponder();
-  }
-  if (rootResponder->parentResponder() == responder) {
-    return responder;
-  }
-  rootResponder = responder;
-  while (rootResponder->parentResponder() != this && rootResponder->parentResponder() != nullptr) {
-    rootResponder = rootResponder->parentResponder();
-  }
-  if (rootResponder->parentResponder() == this) {
-    return this;
-  }
-  Responder * r = nullptr;
-  if (parentResponder()) {
-    r = parentResponder()->commonAncestorWith(responder);
-   }
-   Responder * s = nullptr;
-   if (responder->parentResponder()) {
-    s = commonAncestorWith(responder->parentResponder());
-   }
-   if (r) {
-    return r;
-  }
-  return s;
+  return nullptr;
+}
+
+bool Responder::hasAncestor(Responder * responder) const {
+  assert(responder != nullptr);
+  Responder * p = const_cast<Responder *>(this);
+  while (p != nullptr) {
+    if (p == responder) {
+      return true;
+    }
+    p = p->parentResponder();
+  }
+  return false;
 }
--- a/ion/include/ion/exam_mode.h
+++ b/ion/include/ion/exam_mode.h
@@ -1,11 +1,15 @@
 #ifndef ION_EXAM_MODE_H
 #define ION_EXAM_MODE_H

+extern "C" {
+#include <stdint.h>
+}
+
 namespace Ion {
 namespace ExamMode {

-bool FetchExamMode();
-void ToggleExamMode();
+uint8_t FetchExamMode();
+void IncrementExamMode(uint8_t delta);

 }
 }
--- a/ion/src/device/Makefile
+++ b/ion/src/device/Makefile
@@ -19,20 +19,5 @@ ion_src += $(addprefix ion/src/shared/, \

 ION_DEVICE_SFLAGS = -Iion/src/device/$(MODEL) -Iion/src/device/shared

-$(call object_for,$(ion_device_src) $(dfu_src) $(ion_target_device_flasher_light_src) $(ion_target_device_flasher_verbose_src) $(usb_src) $(ion_target_device_bench_src) $(ion_device_dfu_xip_src) $(ion_device_dfu_relocated_src) $(ion_console_uart_src)): SFLAGS += $(ION_DEVICE_SFLAGS)
+$(call object_for,$(sort $(ion_device_src) $(dfu_src) $(ion_target_device_flasher_light_src) $(ion_target_device_flasher_verbose_src) $(usb_src) $(ion_target_device_bench_src) $(ion_device_dfu_xip_src) $(ion_device_dfu_relocated_src) $(ion_console_uart_src))): SFLAGS += $(ION_DEVICE_SFLAGS)
 ion_src += $(ion_device_src)
-
-# When using the register.h C++ file in production mode, we expect the compiler
-# to completely inline all bit manipulations. For some reason, if we build using
-# the -Os optimization flag, GCC doesn't inline everything and and ends up
-# emitting calls to aeabi_llsl for 64-bits registers. This is very sub-optimal
-# so we're enforcing -O3 for this specific file.
-
-ifneq ($(DEBUG),1)
-ifneq ($(COMPILER),llvm)
-$(BUILD_DIR)/ion/src/device/led.o: SFLAGS+=-O3
-$(BUILD_DIR)/ion/src/device/console.o: SFLAGS+=-O3
-$(BUILD_DIR)/ion/src/device/display.o: SFLAGS+=-O3
-$(BUILD_DIR)/ion/src/device/swd.o: SFLAGS+=-O3
-endif
-endif
--- a/ion/src/device/n0100/drivers/config/external_flash.h
+++ b/ion/src/device/n0100/drivers/config/external_flash.h
@@ -22,7 +22,10 @@ using namespace Regs;

 constexpr static uint32_t StartAddress = 0xFFFFFFFF;
 constexpr static uint32_t EndAddress = 0xFFFFFFFF;
-constexpr static int NumberOfSectors = 0;
+constexpr static int NumberOf4KSectors = 0;
+constexpr static int NumberOf32KSectors = 0;
+constexpr static int NumberOf64KSectors = 0;
+constexpr static int NumberOfSectors = NumberOf4KSectors + NumberOf32KSectors + NumberOf64KSectors;
 constexpr static AFGPIOPin Pins[] = {};

 }
--- a/ion/src/device/n0110/drivers/cache.cpp
+++ b/ion/src/device/n0110/drivers/cache.cpp
@@ -7,43 +7,39 @@ namespace Cache {
 using namespace Regs;

 void privateCleanInvalidateDisableDCache(bool clean, bool invalidate, bool disable) {
+  // Select Level 1 data cache
  CORTEX.CSSELR()->set(0);
  dsb();

-  // Associativity = 6
-
-  uint32_t sets = CORTEX.CCSIDR()->getNUMSETS();
-  uint32_t ways = CORTEX.CCSIDR()->getASSOCIATIVITY();
-
+  // Disable D-Cache
  if (disable) {
    CORTEX.CCR()->setDC(false);
    dsb();
  }

-  do {
-    uint32_t w = ways;
-    do {
-      if (clean) {
-        if (invalidate) {
-          class CORTEX::DCCISW dccisw;
-          dccisw.setSET(sets);
-          dccisw.setWAY(w);
-          CORTEX.DCCISW()->set(dccisw);
-        } else {
-          class CORTEX::DCCSW dccsw;
-          dccsw.setSET(sets);
-          dccsw.setWAY(w);
-          CORTEX.DCCSW()->set(dccsw);
-        }
-      } else if (invalidate) {
-        class CORTEX::DCISW dcisw;
-        dcisw.setSET(sets);
-        dcisw.setWAY(w);
-        CORTEX.DCISW()->set(dcisw);
-      }
-      __asm volatile("nop");
-    } while (w-- != 0);
-  } while (sets-- != 0);
+  // Pick the right DC??SW register according to invalidate/disable parameters
+  volatile CORTEX::DCSW * target = nullptr;
+  if (clean && invalidate) {
+    target = CORTEX.DCCISW();
+  } else if (clean) {
+    target = CORTEX.DCCSW();
+  } else {
+    assert(invalidate);
+    target = CORTEX.DCISW();
+  }
+
+  class CORTEX::CCSIDR ccsidr = CORTEX.CCSIDR()->get();
+  uint32_t sets = ccsidr.getNUMSETS();
+  uint32_t ways = ccsidr.getASSOCIATIVITY();
+
+  for (int set = sets; set >= 0; set--) {
+    for (int way = ways; way >= 0; way--) {
+      class CORTEX::DCSW dcsw;
+      dcsw.setSET(set);
+      dcsw.setWAY(way);
+      target->set(dcsw);
+    }
+  }

  dsb();
  isb();
@@ -69,7 +65,7 @@ void cleanDCache() {

 void enableDCache() {
  invalidateDCache();
-  CORTEX.CCR()->setDC(true);
+  CORTEX.CCR()->setDC(true); // Enable D-cache
  dsb();
  isb();
 }
@@ -81,14 +77,14 @@ void disableDCache() {
 void invalidateICache() {
  dsb();
  isb();
-  CORTEX.ICIALLU()->set(0);
+  CORTEX.ICIALLU()->set(0); // Invalidate I-cache
  dsb();
  isb();
 }

 void enableICache() {
  invalidateICache();
-  CORTEX.CCR()->setIC(true);
+  CORTEX.CCR()->setIC(true); // Enable I-cache
  dsb();
  isb();
 }
@@ -96,8 +92,10 @@ void enableICache() {
 void disableICache() {
  dsb();
  isb();
-  CORTEX.CCR()->setIC(false);
-  invalidateICache();
+  CORTEX.CCR()->setIC(false); // Disable I-cache
+  CORTEX.ICIALLU()->set(0); // Invalidate I-cache
+  dsb();
+  isb();
 }


--- a/ion/src/device/n0110/drivers/config/external_flash.h
+++ b/ion/src/device/n0110/drivers/config/external_flash.h
@@ -22,7 +22,12 @@ using namespace Regs;

 constexpr static uint32_t StartAddress = 0x90000000;
 constexpr static uint32_t EndAddress = 0x90800000;
-constexpr static int NumberOfSectors = 128;
+
+constexpr static int NumberOf4KSectors = 8;
+constexpr static int NumberOf32KSectors = 1;
+constexpr static int NumberOf64KSectors = 128 - 1;
+constexpr static int NumberOfSectors = NumberOf4KSectors + NumberOf32KSectors + NumberOf64KSectors;
+
 constexpr static AFGPIOPin Pins[] = {
  AFGPIOPin(GPIOB, 2,  GPIO::AFR::AlternateFunction::AF9, GPIO::PUPDR::Pull::None, GPIO::OSPEEDR::OutputSpeed::Fast),
  AFGPIOPin(GPIOB, 6,  GPIO::AFR::AlternateFunction::AF10,  GPIO::PUPDR::Pull::None, GPIO::OSPEEDR::OutputSpeed::Fast),
--- a/ion/src/device/n0110/drivers/config/usb.h
+++ b/ion/src/device/n0110/drivers/config/usb.h
@@ -14,7 +14,7 @@ constexpr static AFGPIOPin VbusPin = AFGPIOPin(GPIOA, 9, GPIO::AFR::AlternateFun
 constexpr static AFGPIOPin DmPin = AFGPIOPin(GPIOA, 11, GPIO::AFR::AlternateFunction::AF10, GPIO::PUPDR::Pull::None, GPIO::OSPEEDR::OutputSpeed::Fast);
 constexpr static AFGPIOPin DpPin = AFGPIOPin(GPIOA, 12, GPIO::AFR::AlternateFunction::AF10, GPIO::PUPDR::Pull::None, GPIO::OSPEEDR::OutputSpeed::Fast);

-constexpr static const char * InterfaceStringDescriptor = "@Flash/0x08000000/04*016Kg/0x90000000/64*064Kg,64*064Kg";
+constexpr static const char * InterfaceStringDescriptor = "@Flash/0x08000000/04*016Kg/0x90000000/08*004Kg,01*032Kg,63*064Kg,64*064Kg";

 }
 }
--- a/ion/src/device/n0110/drivers/led.cpp
+++ b/ion/src/device/n0110/drivers/led.cpp
@@ -9,7 +9,7 @@ namespace LED {

 KDColor updateColorWithPlugAndCharge() {
  KDColor ledColor = getColor();
-  if (GlobalPreferences::sharedGlobalPreferences()->examMode()) { // If exam mode is on, we do not update the LED with the plugged/charging state
+  if (GlobalPreferences::sharedGlobalPreferences()->isInExamMode() { // If exam mode is on, we do not update the LED with the plugged/charging state
    if (USB::isPlugged()) {
      ledColor = Battery::isCharging() ? KDColorOrange : KDColorGreen;
    } else {
--- a/ion/src/device/shared/drivers/exam_mode.cpp
+++ b/ion/src/device/shared/drivers/exam_mode.cpp
@@ -3,14 +3,14 @@
 #include "flash.h"
 #include <assert.h>

-namespace Ion {
-namespace ExamMode {
-
 extern "C" {
  extern char _exam_mode_buffer_start;
  extern char _exam_mode_buffer_end;
 }

+namespace Ion {
+namespace ExamMode {
+
 char ones[Config::ExamModeBufferSize]
  __attribute__((section(".exam_mode_buffer")))
  __attribute__((used))
@@ -18,33 +18,24 @@ char ones[Config::ExamModeBufferSize]

 /* The exam mode is written in flash so that it is resilient to resets.
 * We erase the dedicated flash sector (all bits written to 1) and, upon
- * activating or deactivating the exam mode we write one bit to 0. To determine
- * if we are in exam mode, we count the number of leading 0 bits. If it is even,
- * the exam mode is deactivated, if it is odd, the exam mode is activated. */
+ * deactivating or activating standard or Dutch exam mode we write one or two
+ * bits to 0. To determine in which exam mode we are, we count the number of
+ * leading 0 bits. If it is equal to:
+ * - 0[3]: the exam mode is off;
+ * - 1[3]: the standard exam mode is activated;
+ * - 2[3]: the Dutch exam mode is activated. */

 /* significantExamModeAddress returns the first uint32_t * in the exam mode
- * flash sector that does not point to 0. If this flash sector has only 0s, it
- * is erased (to 1) and significantExamModeAddress returns the start of the
- * sector. */
+ * flash sector that does not point to 0. If this flash sector has only 0s or
+ * if it has only one 1, it is erased (to 1) and significantExamModeAddress
+ * returns the start of the sector. */

-uint32_t * SignificantExamModeAddress() {
-  uint32_t * persitence_start = (uint32_t *)&_exam_mode_buffer_start;
-  uint32_t * persitence_end = (uint32_t *)&_exam_mode_buffer_end;
-  while (persitence_start < persitence_end && *persitence_start == 0x0) {
-    // Skip even number of zero bits
-    persitence_start++;
-  }
-  if (persitence_start == persitence_end) {
-    assert(Ion::Device::Flash::SectorAtAddress((uint32_t)&_exam_mode_buffer_start) >= 0);
-    Ion::Device::Flash::EraseSector(Ion::Device::Flash::SectorAtAddress((uint32_t)&_exam_mode_buffer_start));
-    return (uint32_t *)&_exam_mode_buffer_start;
-  }
-  return persitence_start;
-}
+constexpr static size_t numberOfBitsInByte = 8;

-size_t firstOneBit(int i, size_t size) {
+// if i = 0b000011101, firstOneBitInByte(i) returns 5
+size_t numberOfBitsAfterLeadingZeroes(int i) {
  int minShift = 0;
-  int maxShift = size;
+  int maxShift = numberOfBitsInByte;
  while (maxShift > minShift+1) {
    int shift = (minShift + maxShift)/2;
    int shifted = i >> shift;
@@ -57,23 +48,72 @@ size_t firstOneBit(int i, size_t size) {
  return maxShift;
 }

-bool FetchExamMode() {
-  uint32_t * readingAddress = SignificantExamModeAddress();
-  size_t numberOfLeading0 = 32 - firstOneBit(*readingAddress, 32);
-  return numberOfLeading0 % 2 == 1;
+uint8_t * SignificantExamModeAddress() {
+  uint32_t * persitence_start_32 = (uint32_t *)&_exam_mode_buffer_start;
+  uint32_t * persitence_end_32 = (uint32_t *)&_exam_mode_buffer_end;
+  assert(persitence_end_32 - persitence_start_32 % 4 == 0);
+  while (persitence_start_32 < persitence_end_32 && *persitence_start_32 == 0x0) {
+    // Scan by groups of 32 bits to reach first non-zero bit
+    persitence_start_32++;
+  }
+  uint8_t * persitence_start_8 = (uint8_t *)persitence_start_32;
+  uint8_t * persitence_end_8 = (uint8_t *)persitence_end_32;
+  while (persitence_start_8 < persitence_end_8 && *persitence_start_8 == 0x0) {
+    // Scan by groups of 8 bits to reach first non-zero bit
+    persitence_start_8++;
+  }
+  if (persitence_start_8 == persitence_end_8
+  // we can't toggle from 0[3] to 2[3] when there is only one 1 bit in the whole sector
+  || (persitence_start_8 + 1 == persitence_end_8 && *persitence_start_8 == 1)) {
+    assert(Ion::Device::Flash::SectorAtAddress((uint32_t)&_exam_mode_buffer_start) >= 0);
+    Ion::Device::Flash::EraseSector(Ion::Device::Flash::SectorAtAddress((uint32_t)&_exam_mode_buffer_start));
+    return (uint8_t *)&_exam_mode_buffer_start;
+  }
+
+  return persitence_start_8;
 }

-void ToggleExamMode() {
-  uint32_t * writingAddress = SignificantExamModeAddress();
+uint8_t FetchExamMode() {
+  uint8_t * readingAddress = SignificantExamModeAddress();
+  // Count the number of 0[3] before reading address
+  uint32_t nbOfZerosBefore = ((readingAddress - (uint8_t *)&_exam_mode_buffer_start) * numberOfBitsInByte) % 3;
+  // Count the number of 0[3] at reading address
+  size_t numberOfLeading0 = (numberOfBitsInByte - numberOfBitsAfterLeadingZeroes(*readingAddress)) % 3;
+  return (nbOfZerosBefore + numberOfLeading0) % 3;
+}
+
+void IncrementExamMode(uint8_t delta) {
+  assert(delta == 1 || delta == 2);
+  uint8_t * writingAddress = SignificantExamModeAddress();
  assert(*writingAddress != 0);
-  // Compute the new value with one bit switched
-  uint8_t numberOfLeadingZeroes = 32 - firstOneBit(*writingAddress, 32);
-  /* When writing in flash, we can only switch a 1 to a 0. If we want to switch
-   * the fifth bit in a byte, we can thus write "11110111". */
-  uint32_t newValue = ~(1 << (31 - numberOfLeadingZeroes));
+  size_t nbOfTargetedOnes = numberOfBitsAfterLeadingZeroes(*writingAddress);
+
+  // Compute the new value with delta bits switched to 0.
+  /* We write in 2 bytes instead of 1, in case there was only one bit
+   * left to 1 in writingAddress. */
+  nbOfTargetedOnes += numberOfBitsInByte;
+  nbOfTargetedOnes -= delta;
+  constexpr size_t newValueSize = sizeof(uint16_t)/sizeof(uint8_t);
+  uint8_t newValue[newValueSize];
+  if (nbOfTargetedOnes > numberOfBitsInByte) {
+    size_t nbOfTargetedOnesInFirstByte = nbOfTargetedOnes - numberOfBitsInByte;
+    assert(nbOfTargetedOnesInFirstByte <= numberOfBitsInByte);
+    newValue[0] = ((uint16_t)1 << nbOfTargetedOnesInFirstByte) - 1;
+    newValue[1] = 0xFF;
+  } else {
+    assert(nbOfTargetedOnes <= numberOfBitsInByte);
+    newValue[0] = 0;
+    newValue[1] = ((uint16_t)1 << nbOfTargetedOnes) - 1;
+  }

  // Write the value in flash
-  Ion::Device::Flash::WriteMemory((uint8_t *)writingAddress, (uint8_t *)&newValue, sizeof(uint32_t));
+  /* As the number of changed bits is capped by 2, if *writingAddress has more
+   * than one remaining 1 bit, we know we toggle bits only in the first byte of
+   * newValue. We can settle for writing one byte instead of two. */
+  size_t writtenFlash = *writingAddress == 1 ? sizeof(uint16_t) : sizeof(uint8_t);
+  /* Avoid writing out of sector */
+  assert(writingAddress < (uint8_t *)&_exam_mode_buffer_end - 1 || (writingAddress == (uint8_t *)&_exam_mode_buffer_end - 1 && writtenFlash == 1));
+  Ion::Device::Flash::WriteMemory(writingAddress, newValue, writtenFlash);
 }

 }
--- a/ion/src/device/shared/drivers/external_flash.cpp
+++ b/ion/src/device/shared/drivers/external_flash.cpp
@@ -71,6 +71,8 @@ enum class Command : uint8_t {
  Reset = 0x99,
  // Erase the whole chip or a 64-Kbyte block as being "1"
  ChipErase = 0xC7,
+  Erase4KbyteBlock = 0x20,
+  Erase32KbyteBlock = 0x52,
  Erase64KbyteBlock = 0xD8,
  SetReadParameters = 0xC0,
  DeepPowerDown = 0xB9,
@@ -79,6 +81,8 @@ enum class Command : uint8_t {
 };

 static constexpr uint8_t NumberOfAddressBitsIn64KbyteBlock = 16;
+static constexpr uint8_t NumberOfAddressBitsIn32KbyteBlock = 15;
+static constexpr uint8_t NumberOfAddressBitsIn4KbyteBlock = 12;

 class ExternalFlashStatusRegister {
 public:
@@ -367,10 +371,23 @@ void shutdown() {
 }

 int SectorAtAddress(uint32_t address) {
+  /* WARNING: this code assumes that the flash sectors are of increasing size:
+   * first all 4K sectors, then all 32K sectors, and finally all 64K sectors. */
  int i = address >> NumberOfAddressBitsIn64KbyteBlock;
-  if (i >= Config::NumberOfSectors) {
+  if (i > Config::NumberOf64KSectors) {
    return -1;
  }
+  if (i >= 1) {
+    return Config::NumberOf4KSectors + Config::NumberOf32KSectors + i - 1;
+  }
+  i = address >> NumberOfAddressBitsIn32KbyteBlock;
+  if (i >= 1) {
+    i = Config::NumberOf4KSectors + i - 1;
+    assert(i >= 0 && i <= Config::NumberOf32KSectors);
+    return i;
+  }
+  i = address >> NumberOfAddressBitsIn4KbyteBlock;
+  assert(i <= Config::NumberOf4KSectors);
  return i;
 }

@@ -408,7 +425,22 @@ void __attribute__((noinline)) EraseSector(int i) {
  unlockFlash();
  send_command(Command::WriteEnable);
  wait();
-  send_write_command(Command::Erase64KbyteBlock, reinterpret_cast<uint8_t *>(i << NumberOfAddressBitsIn64KbyteBlock), nullptr, 0);
+  /* WARNING: this code assumes that the flash sectors are of increasing size:
+   * first all 4K sectors, then all 32K sectors, and finally all 64K sectors. */
+  if (i < Config::NumberOf4KSectors) {
+    send_write_command(Command::Erase4KbyteBlock, reinterpret_cast<uint8_t *>(i << NumberOfAddressBitsIn4KbyteBlock), nullptr, 0);
+  } else if (i < Config::NumberOf4KSectors + Config::NumberOf32KSectors) {
+    /* If the sector is the number Config::NumberOf4KSectors, we want to write
+     * at the address 1 << NumberOfAddressBitsIn32KbyteBlock, hence the formula
+     * (i - Config::NumberOf4KSectors + 1). */
+    send_write_command(Command::Erase32KbyteBlock, reinterpret_cast<uint8_t *>((i - Config::NumberOf4KSectors + 1) << NumberOfAddressBitsIn32KbyteBlock), nullptr, 0);
+  } else {
+    /* If the sector is the number
+     * Config::NumberOf4KSectors - Config::NumberOf32KSectors, we want to write
+     * at the address 1 << NumberOfAddressBitsIn32KbyteBlock, hence the formula
+     * (i - Config::NumberOf4KSectors - Config::NumberOf32KSectors + 1). */
+    send_write_command(Command::Erase64KbyteBlock, reinterpret_cast<uint8_t *>((i - Config::NumberOf4KSectors - Config::NumberOf32KSectors + 1) << NumberOfAddressBitsIn64KbyteBlock), nullptr, 0);
+  }
  wait();
  set_as_memory_mapped();
 }
--- a/ion/src/device/shared/drivers/external_flash.h
+++ b/ion/src/device/shared/drivers/external_flash.h
@@ -15,7 +15,12 @@
 *   2^7                64KiB blocks   0x..0000 - 0x..FFFF
 *   2^7 * 2            32KiB blocks   0x..0000 - 0x..7FFF or 0x..8000 - 0x..FFFF
 *   2^7 * 2 * 2^3       4KiB blocks   0x...000 - 0x...FFF
- *   2^7 * 2 * 2^3 * 2^4 256B pages    0x....00 - 0x....FF */
+ *   2^7 * 2 * 2^3 * 2^4 256B pages    0x....00 - 0x....FF
+ *
+ * To be able to erase a small sector for the exam mode, we say that the flash
+ * is cut into 8 + 1 + 2^7-1 = 136 sectors: 8 sectors of 4Kb, 1 sector of 32Kb
+ * and 2^7-1 sectors of 64Kb. These sectors are the smallest erasable units. If
+ * need be, we can define more sectors to erase even more finely the flash. */

 namespace Ion {
 namespace Device {
--- a/ion/src/device/shared/drivers/reset.cpp
+++ b/ion/src/device/shared/drivers/reset.cpp
@@ -12,7 +12,13 @@ using namespace Regs;

 void core() {
  // Perform a full core reset
+  Ion::Device::Cache::dsb(); // Complete all memory accesses
  CORTEX.AIRCR()->requestReset();
+  Ion::Device::Cache::dsb();
+  // Wait until reset
+  while (true) {
+    asm("nop");
+  }
 }

 /* We isolate the jump code that needs to be executed from the internal
@@ -41,8 +47,7 @@ void __attribute__((noinline)) internalFlashJump(uint32_t jumpIsrVectorAddress)

 void jump(uint32_t jumpIsrVectorAddress) {
  // Disable cache before reset
-  Ion::Device::Cache::disableDCache();
-  Ion::Device::Cache::disableICache();
+  Ion::Device::Cache::disable();

  /* Shutdown all clocks and periherals to mimic a hardware reset. */
  Board::shutdownPeripherals();
--- a/ion/src/device/shared/regs/cortex.h
+++ b/ion/src/device/shared/regs/cortex.h
@@ -72,6 +72,7 @@ public:
 #if REGS_CORTEX_CONFIG_CACHE
  class CCSIDR : public Register32 {
  public:
+    using Register32::Register32;
    REGS_FIELD(ASSOCIATIVITY, uint16_t, 12, 3);
    REGS_FIELD(NUMSETS, uint16_t, 27, 13);
  };
@@ -100,25 +101,20 @@ public:
    using Register32::Register32;
  };

-  class DCISW : public Register32 {
+  class DCSW : public Register32 {
  public:
-    DCISW() : Register32(0) {}
+    DCSW() : Register32(0) {}
    REGS_FIELD(SET, uint16_t, 13, 5);
    REGS_FIELD(WAY, uint8_t, 31, 30);
  };

-  class DCCSW : public Register32 {
-  public:
-    DCCSW() : Register32(0) {}
-    REGS_FIELD(SET, uint16_t, 13, 5);
-    REGS_FIELD(WAY, uint8_t, 31, 30);
+  class DCISW : public DCSW {
  };

-  class DCCISW : public Register32 {
-  public:
-    DCCISW() : Register32(0) {}
-    REGS_FIELD(SET, uint16_t, 13, 5);
-    REGS_FIELD(WAY, uint8_t, 31, 30);
+  class DCCSW : public DCSW {
+  };
+
+  class DCCISW : public DCSW {
  };
 #endif

--- a/ion/src/device/shared/regs/register.h
+++ b/ion/src/device/shared/regs/register.h
@@ -4,6 +4,8 @@
 #include <stdint.h>
 #include <assert.h>

+#define always_inline __attribute__((always_inline))
+
 namespace Ion {
 namespace Device {
 namespace Regs {
@@ -22,7 +24,7 @@ public:
  T get() volatile {
    return m_value;
  }
-  void setBitRange(uint8_t high, uint8_t low, T value) volatile {
+  always_inline void setBitRange(uint8_t high, uint8_t low, T value) volatile {
    m_value = bit_range_set_value(high, low, m_value, value);
  }
  T getBitRange(uint8_t high, uint8_t low) volatile {
@@ -57,8 +59,8 @@ typedef Register<uint64_t> Register64;
 }
 }

-#define REGS_FIELD_R(name,type,high,low) type get##name() volatile { return (type)getBitRange(high,low); };
-#define REGS_FIELD_W(name,type,high,low) void set##name(type v) volatile { static_assert(sizeof(type) <= 4, "Invalid size"); setBitRange(high, low, static_cast<uint32_t>(v)); };
+#define REGS_FIELD_R(name,type,high,low) always_inline type get##name() volatile { return (type)getBitRange(high,low); };
+#define REGS_FIELD_W(name,type,high,low) always_inline void set##name(type v) volatile { static_assert(sizeof(type) <= 4, "Invalid size"); setBitRange(high, low, static_cast<uint32_t>(v)); };
 #define REGS_FIELD(name,type,high,low) REGS_FIELD_R(name,type,high,low); REGS_FIELD_W(name,type,high,low);
 #define REGS_TYPE_FIELD(name,high,low) REGS_FIELD(name,name,high,low)
 #define REGS_BOOL_FIELD(name,bit) REGS_FIELD(name,bool,bit,bit)
--- a/ion/src/shared/dummy/exam_mode.cpp
+++ b/ion/src/shared/dummy/exam_mode.cpp
@@ -3,11 +3,11 @@
 namespace Ion {
 namespace ExamMode {

-bool FetchExamMode() {
+uint8_t FetchExamMode() {
  return false;
 }

-void ToggleExamMode() {
+void IncrementExamMode(uint8_t delta) {
 }

 }
--- a/kandinsky/include/kandinsky/color.h
+++ b/kandinsky/include/kandinsky/color.h
@@ -46,5 +46,6 @@ constexpr KDColor KDColorGreen = KDColor::RGB24(0x00FF00);
 constexpr KDColor KDColorBlue = KDColor::RGB24(0x0000FF);
 constexpr KDColor KDColorYellow = KDColor::RGB24(0xFFFF00);
 constexpr KDColor KDColorOrange = KDColor::RGB24(0xFF9900);
+constexpr KDColor KDColorPurple = KDColor::RGB24(0xFF00DD);

 #endif
--- a/poincare/include/poincare/approximation_helper.h
+++ b/poincare/include/poincare/approximation_helper.h
@@ -9,6 +9,7 @@
 namespace Poincare {

 namespace ApproximationHelper {
+  template <typename T> int PositiveIntegerApproximationIfPossible(const ExpressionNode * expression, bool * isUndefined, Context * context, Preferences::ComplexFormat complexFormat, Preferences::AngleUnit angleUnit);
  template <typename T> std::complex<T> TruncateRealOrImaginaryPartAccordingToArgument(std::complex<T> c);

  template <typename T> using ComplexCompute = Complex<T>(*)(const std::complex<T>, Preferences::ComplexFormat complexFormat, Preferences::AngleUnit angleUnit);
--- a/poincare/src/approximation_helper.cpp
+++ b/poincare/src/approximation_helper.cpp
@@ -15,6 +15,18 @@ template <typename T> T absMod(T a, T b) {
  return result > b/2 ? b-result : result;
 }

+static inline int absInt(int x) { return x < 0 ? -x : x; }
+
+template <typename T> int ApproximationHelper::PositiveIntegerApproximationIfPossible(const ExpressionNode * expression, bool * isUndefined, Context * context, Preferences::ComplexFormat complexFormat, Preferences::AngleUnit angleUnit) {
+  Evaluation<T> evaluation = expression->approximate(T(), context, complexFormat, angleUnit);
+  T scalar = evaluation.toScalar();
+  if (std::isnan(scalar) || scalar != (int)scalar) {
+    *isUndefined = true;
+    return 0;
+  }
+  return absInt((int)scalar);
+}
+
 template <typename T> std::complex<T> ApproximationHelper::TruncateRealOrImaginaryPartAccordingToArgument(std::complex<T> c) {
  T arg = std::arg(c);
  T precision = 10*Expression::Epsilon<T>();
@@ -92,6 +104,8 @@ template<typename T> MatrixComplex<T> ApproximationHelper::ElementWiseOnComplexM
  return matrix;
 }

+template int Poincare::ApproximationHelper::PositiveIntegerApproximationIfPossible<float>(Poincare::ExpressionNode const*, bool*, Poincare::Context*, Poincare::Preferences::ComplexFormat, Poincare::Preferences::AngleUnit);
+template int Poincare::ApproximationHelper::PositiveIntegerApproximationIfPossible<double>(Poincare::ExpressionNode const*, bool*, Poincare::Context*, Poincare::Preferences::ComplexFormat, Poincare::Preferences::AngleUnit);
 template std::complex<float> Poincare::ApproximationHelper::TruncateRealOrImaginaryPartAccordingToArgument<float>(std::complex<float>);
 template std::complex<double> Poincare::ApproximationHelper::TruncateRealOrImaginaryPartAccordingToArgument<double>(std::complex<double>);
 template Poincare::Evaluation<float> Poincare::ApproximationHelper::Map(const Poincare::ExpressionNode * expression, Poincare::Context * context, Poincare::Preferences::ComplexFormat, Poincare::Preferences::AngleUnit angleUnit, Poincare::ApproximationHelper::ComplexCompute<float> compute);
--- a/poincare/src/great_common_divisor.cpp
+++ b/poincare/src/great_common_divisor.cpp
@@ -1,5 +1,6 @@
 #include <poincare/great_common_divisor.h>

+#include <poincare/approximation_helper.h>
 #include <poincare/arithmetic.h>
 #include <poincare/layout_helper.h>
 #include <poincare/rational.h>
@@ -27,22 +28,20 @@ Expression GreatCommonDivisorNode::shallowReduce(ReductionContext reductionConte

 template<typename T>
 Evaluation<T> GreatCommonDivisorNode::templatedApproximate(Context * context, Preferences::ComplexFormat complexFormat, Preferences::AngleUnit angleUnit) const {
-  Evaluation<T> f1Input = childAtIndex(0)->approximate(T(), context, complexFormat, angleUnit);
-  Evaluation<T> f2Input = childAtIndex(1)->approximate(T(), context, complexFormat, angleUnit);
-  T f1 = f1Input.toScalar();
-  T f2 = f2Input.toScalar();
-  if (std::isnan(f1) || std::isnan(f2) || f1 != (int)f1 || f2 != (int)f2) {
+  bool isUndefined = false;
+  int a = ApproximationHelper::PositiveIntegerApproximationIfPossible<T>(childAtIndex(0), &isUndefined, context, complexFormat, angleUnit);
+  int b = ApproximationHelper::PositiveIntegerApproximationIfPossible<T>(childAtIndex(1), &isUndefined, context, complexFormat, angleUnit);
+  if (isUndefined) {
    return Complex<T>::Undefined();
  }
-  int a = (int)f2;
-  int b = (int)f1;
-  if (f1 > f2) {
+  if (b > a) {
+    int temp = b;
    b = a;
-    a = (int)f1;
+    a = temp;
  }
  int r = 0;
  while((int)b!=0){
-    r = a - ((int)(a/b))*b;
+    r = a - (a/b)*b;
    a = b;
    b = r;
  }
--- a/poincare/src/least_common_multiple.cpp
+++ b/poincare/src/least_common_multiple.cpp
@@ -1,4 +1,5 @@
 #include <poincare/least_common_multiple.h>
+#include <poincare/approximation_helper.h>
 #include <poincare/rational.h>
 #include <poincare/undefined.h>
 #include <poincare/arithmetic.h>
@@ -27,26 +28,24 @@ Expression LeastCommonMultipleNode::shallowReduce(ReductionContext reductionCont

 template<typename T>
 Evaluation<T> LeastCommonMultipleNode::templatedApproximate(Context * context, Preferences::ComplexFormat complexFormat, Preferences::AngleUnit angleUnit) const {
-  Evaluation<T> f1Input = childAtIndex(0)->approximate(T(), context, complexFormat, angleUnit);
-  Evaluation<T> f2Input = childAtIndex(1)->approximate(T(), context, complexFormat, angleUnit);
-  T f1 = f1Input.toScalar();
-  T f2 = f2Input.toScalar();
-  if (std::isnan(f1) || std::isnan(f2) || f1 != (int)f1 || f2 != (int)f2) {
+  bool isUndefined = false;
+  int a = ApproximationHelper::PositiveIntegerApproximationIfPossible<T>(childAtIndex(0), &isUndefined, context, complexFormat, angleUnit);
+  int b = ApproximationHelper::PositiveIntegerApproximationIfPossible<T>(childAtIndex(1), &isUndefined, context, complexFormat, angleUnit);
+  if (isUndefined) {
    return Complex<T>::Undefined();
  }
-  if (f1 == 0.0f || f2 == 0.0f) {
+  if (a == 0 || b == 0) {
    return Complex<T>::Builder(0.0);
  }
-  int a = (int)f2;
-  int b = (int)f1;
-  if (f1 > f2) {
+  if (b > a) {
+    int temp = b;
    b = a;
-    a = (int)f1;
+    a = temp;
  }
  int product = a*b;
  int r = 0;
  while((int)b!=0){
-    r = a - ((int)(a/b))*b;
+    r = a - (a/b)*b;
    a = b;
    b = r;
  }
--- a/poincare/test/approximation.cpp
+++ b/poincare/test/approximation.cpp
@@ -269,12 +269,18 @@ QUIZ_CASE(poincare_approximation_function) {

  assert_expression_approximates_to<float>("gcd(234,394)", "2");
  assert_expression_approximates_to<double>("gcd(234,394)", "2");
+  assert_expression_approximates_to<float>("gcd(-234,394)", "2");
+  assert_expression_approximates_to<double>("gcd(234,-394)", "2");
+  assert_expression_approximates_to<float>("gcd(-234,-394)", "2");

  assert_expression_approximates_to<float>("im(2+3𝐢)", "3");
  assert_expression_approximates_to<double>("im(2+3𝐢)", "3");

  assert_expression_approximates_to<float>("lcm(234,394)", "46098");
  assert_expression_approximates_to<double>("lcm(234,394)", "46098");
+  assert_expression_approximates_to<float>("lcm(-234,394)", "46098");
+  assert_expression_approximates_to<double>("lcm(234,-394)", "46098");
+  assert_expression_approximates_to<float>("lcm(-234,-394)", "46098");

  assert_expression_approximates_to<float>("int(x,x, 1, 2)", "1.5");
  assert_expression_approximates_to<double>("int(x,x, 1, 2)", "1.5");