Add RM68120 driver (UNTESTED!)

TFT_Drivers/RM68120_Defines.h

+// Change the width and height if required (defined in portrait mode)
+// or use the constructor to over-ride defaults
+// RM68120_DRIVER
+
+#define TFT_WIDTH  480
+#define TFT_HEIGHT 800
+
+//Set driver type common to all TBD initialisation options
+#ifndef RM68120_DRIVER
+  #define RM68120_DRIVER
+#endif
+
+// Delay between some initialisation commands
+#define TFT_INIT_DELAY 0x80 // Not used unless commandlist invoked
+
+// Generic commands used by TFT_eSPI.cpp
+#define TFT_NOP     0x0000
+#define TFT_SWRST   0x0100
+
+#define TFT_CASET   0x2A00
+#define TFT_PASET   0x2B00
+#define TFT_RAMWR   0x2C00
+
+#define TFT_RAMRD   0x2E00
+#define TFT_IDXRD   0xDD00 // ILI9341 only, indexed control register read
+
+#define TFT_MADCTL  0x3600
+#define TFT_MAD_MY  0x80
+#define TFT_MAD_MX  0x40
+#define TFT_MAD_MV  0x20
+#define TFT_MAD_ML  0x10
+#define TFT_MAD_BGR 0x08
+#define TFT_MAD_MH  0x04
+#define TFT_MAD_RGB 0x00
+
+#ifdef TFT_RGB_ORDER
+  #if (TFT_RGB_ORDER == 1)
+    #define TFT_MAD_COLOR_ORDER TFT_MAD_RGB
+  #else
+    #define TFT_MAD_COLOR_ORDER TFT_MAD_BGR
+  #endif
+#else
+  #define TFT_MAD_COLOR_ORDER TFT_MAD_RGB
+#endif
+
+#define TFT_INVOFF  0x2000
+#define TFT_INVON   0x2100

TFT_Drivers/RM68120_Rotation.h

+
+// This is the command sequence that rotates the RM68120 driver coordinate frame
+
+  rotation = m % 4; // Limit the range of values to 0-3
+
+  writecommand(TFT_MADCTL);
+  switch (rotation) {
+    case 0:
+      writedata(TFT_MAD_COLOR_ORDER);
+      _width  = _init_width;
+      _height = _init_height;
+      break;
+    case 1:
+      writedata(TFT_MAD_MV | TFT_MAD_MX | TFT_MAD_COLOR_ORDER);
+      _width  = _init_height;
+      _height = _init_width;
+      break;
+    case 2:
+      writedata(TFT_MAD_MX | TFT_MAD_MY | TFT_MAD_COLOR_ORDER);
+      _width  = _init_width;
+      _height = _init_height;
+      break;
+    case 3:
+      writedata(TFT_MAD_MV | TFT_MAD_MY | TFT_MAD_COLOR_ORDER);
+      _width  = _init_height;
+      _height = _init_width;
+      break;
+
+  }