Add first rudimentary support for Anycubic Touchscreen usind serial interface.

Marlin/src/lcd/anycubic_touchscreen.h

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+/*
+ AnycubicTouchscreen.h  --- Support for Anycubic i3 Mega TFT
+  Created by Christian Hopp on 2017-12-09
+  Modiefied by Oliver Köster on 2020-06-02
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ This library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#ifndef anycubic_touchscreen_h
+#define anycubic_touchscreen_h
+
+#include <stdio.h>
+#include "../inc/MarlinConfig.h"
+
+char *itostr2(const uint8_t &x);
+
+#ifndef ULTRA_LCD
+char *itostr3(const int);
+char *ftostr32(const float &);
+#endif
+
+#define TFTBUFSIZE 4
+#define TFT_MAX_CMD_SIZE 96
+#define MSG_MY_VERSION "V116"
+
+#define ANYCUBIC_TFT_STATE_IDLE 0
+#define ANYCUBIC_TFT_STATE_SDPRINT 1
+#define ANYCUBIC_TFT_STATE_SDPAUSE 2
+#define ANYCUBIC_TFT_STATE_SDPAUSE_REQ 3
+#define ANYCUBIC_TFT_STATE_SDPAUSE_OOF 4
+#define ANYCUBIC_TFT_STATE_SDSTOP_REQ 5
+#define ANYCUBIC_TFT_STATE_SDOUTAGE 99
+
+class AnycubicTouchscreenClass
+{
+public:
+  AnycubicTouchscreenClass();
+  void Setup();
+  void CommandScan();
+  void BedHeatingStart();
+  void BedHeatingDone();
+  void HeatingDone();
+  void HeatingStart();
+  void FilamentRunout();
+  void KillTFT();
+  char TFTstate = ANYCUBIC_TFT_STATE_IDLE;
+
+  /**
+  * Anycubic TFT pause states:
+  *
+  * 0 - printing / stopped
+  * 1 - regular pause
+  * 2 - M600 pause
+  * 3 - filament runout pause
+  * 4 - nozzle timeout on M600
+  * 5 - nozzle timeout on filament runout
+  */
+  uint8_t ai3m_pause_state = 0;
+
+private:
+  char TFTcmdbuffer[TFTBUFSIZE][TFT_MAX_CMD_SIZE];
+  int TFTbuflen = 0;
+  int TFTbufindr = 0;
+  int TFTbufindw = 0;
+  char serial3_char;
+  int serial3_count = 0;
+  char *TFTstrchr_pointer;
+  char FlagResumFromOutage = 0;
+  uint16_t filenumber = 0;
+  unsigned long starttime = 0;
+  unsigned long stoptime = 0;
+  uint8_t tmp_extruder = 0;
+  char LastSDstatus = 0;
+  uint16_t HeaterCheckCount = 0;
+  bool IsParked = false;
+
+  struct OutageDataStruct
+  {
+    char OutageDataVersion;
+    char OutageFlag;
+    float last_position[XYZE];
+    float last_bed_temp;
+    float last_hotend_temp;
+    long lastSDposition;
+  } OutageData;
+
+  void WriteOutageEEPromData();
+  void ReadOutageEEPromData();
+
+  float CodeValue();
+  bool CodeSeen(char);
+  void Ls();
+  void StartPrint();
+  void PausePrint();
+  void StopPrint();
+  void StateHandler();
+  void GetCommandFromTFT();
+  void CheckSDCardChange();
+  void CheckHeaterError();
+  void HandleSpecialMenu();
+  void FilamentChangePause();
+  void FilamentChangeResume();
+  void ReheatNozzle();
+  void ParkAfterStop();
+
+  char SelectedDirectory[30];
+  uint8_t SpecialMenu = false;
+
+#if ENABLED(ANYCUBIC_FILAMENT_RUNOUT_SENSOR)
+  char FilamentTestStatus = false;
+  char FilamentTestLastStatus = false;
+  bool FilamentSetMillis = true;
+#endif
+};
+
+extern AnycubicTouchscreenClass AnycubicTouchscreen;
+
+#endif