make custom Anycubic touchscreen implementation an ExtUI module

Start migration to ExtUI module. We do not yet change much of the custom
logic, but this brings us closer to upstream and allows use of some
integration hooks with less patching required.

Marlin/src/lcd/extui/knutwurst/knutwurst_extui.cpp

@@ -0,0 +1,122 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * lcd/extui/knutwurst/knutwurst_extui.cpp
+ */
+
+#include "../../../inc/MarlinConfigPre.h"
+
+#if ENABLED(ANYCUBIC_TOUCHSCREEN)
+
+#include "anycubic_touchscreen.h"
+#include "../ui_api.h"
+
+#include <Arduino.h>    // for the ::tone() call
+
+namespace ExtUI {
+  void onStartup()        { AnycubicTouchscreen.Setup(); }
+  void onIdle()           { AnycubicTouchscreen.CommandScan(); }
+  void onPrinterKilled(FSTR_P const error, FSTR_P const component) { AnycubicTouchscreen.KillTFT(); }
+  void onMediaInserted()  { AnycubicTouchscreen.SDCardStateChange(true); }
+  void onMediaError()     { AnycubicTouchscreen.SDCardError(); }
+  void onMediaRemoved()   { AnycubicTouchscreen.SDCardStateChange(false); }
+  void onPlayTone(const uint16_t frequency, const uint16_t duration) {
+    TERN_(SPEAKER, ::tone(BEEPER_PIN, frequency, duration));
+  }
+  void onPrintTimerStarted()  { }
+  void onPrintTimerPaused()   { }
+  void onPrintTimerStopped()  { }
+  void onFilamentRunout(const extruder_t extruder)   { AnycubicTouchscreen.FilamentRunout(); }
+  void onUserConfirmRequired(const char * const msg) { AnycubicTouchscreen.UserConfirmRequired(msg); }
+  void onStatusChanged(const char * const msg) {}
+
+  void onHomingStart() {}
+  void onHomingDone() {}
+  void onPrintDone() {}
+
+  void onFactoryReset() {}
+
+  void onStoreSettings(char *buff) {
+    // Called when saving to EEPROM (i.e. M500). If the ExtUI needs
+    // permanent data to be stored, it can write up to eeprom_data_size bytes
+    // into buff.
+
+    // Example:
+    //  static_assert(sizeof(myDataStruct) <= eeprom_data_size);
+    //  memcpy(buff, &myDataStruct, sizeof(myDataStruct));
+  }
+
+  void onLoadSettings(const char *buff) {
+    // Called while loading settings from EEPROM. If the ExtUI
+    // needs to retrieve data, it should copy up to eeprom_data_size bytes
+    // from buff
+
+    // Example:
+    //  static_assert(sizeof(myDataStruct) <= eeprom_data_size);
+    //  memcpy(&myDataStruct, buff, sizeof(myDataStruct));
+  }
+
+  void onPostprocessSettings() {
+    // Called after loading or resetting stored settings
+  }
+
+  void onSettingsStored(bool success) {
+    // Called after the entire EEPROM has been written,
+    // whether successful or not.
+  }
+
+  void onSettingsLoaded(bool success) {
+    // Called after the entire EEPROM has been read,
+    // whether successful or not.
+  }
+
+  #if HAS_MESH
+    void onLevelingStart() {}
+    void onLevelingDone() {}
+
+    void onMeshUpdate(const int8_t xpos, const int8_t ypos, const_float_t zval) {
+      // Called when any mesh points are updated
+    }
+
+    void onMeshUpdate(const int8_t xpos, const int8_t ypos, probe_state_t state) {
+      // Called when any mesh points are updated
+    }
+  #endif
+
+  #if ENABLED(POWER_LOSS_RECOVERY)
+    void onPowerLossResume() {
+      // Called on resume from power-loss
+    }
+  #endif
+
+  #if HAS_PID_HEATING
+    void onPidTuning(const result_t rst) {
+      // Called for temperature PID tuning result
+    }
+  #endif
+
+  void onSteppersDisabled() {}
+  void onSteppersEnabled()  {}
+}
+
+#endif // ANYCUBIC_TOUCHSCREEN