Add more DWIN commands, docs (#19395)

Marlin/src/lcd/dwin/dwin_lcd.cpp

   DWIN_Send(i);
 }
 
+// Draw a point
+//  width: point width   0x01-0x0F
+//  height: point height 0x01-0x0F
+//  x,y: upper left point
+void DWIN_Draw_Point(uint8_t width, uint8_t height, uint16_t x, uint16_t y) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x02);
+  DWIN_Byte(i, width);
+  DWIN_Byte(i, height);
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  DWIN_Send(i);
+}
+
 // Draw a line
 //  color: Line segment color
 //  xStart/yStart: Start point
                       uint16_t color, uint16_t bColor, uint16_t x, uint16_t y, char *string) {
   size_t i = 0;
   DWIN_Byte(i, 0x11);
+  // Bit 7: widthAdjust
+  // Bit 6: bShow
+  // Bit 5-4: Unused (0)
+  // Bit 3-0: size
   DWIN_Byte(i, (widthAdjust * 0x80) | (bShow * 0x40) | size);
   DWIN_Word(i, color);
   DWIN_Word(i, bColor);
                           uint16_t bColor, uint8_t iNum, uint16_t x, uint16_t y, uint16_t value) {
   size_t i = 0;
   DWIN_Byte(i, 0x14);
+  // Bit 7: bshow
+  // Bit 6: 1 = signed; 0 = unsigned number;
+  // Bit 5: zeroFill
+  // Bit 4: zeroMode
+  // Bit 3-0: size
   DWIN_Byte(i, (bShow * 0x80) | (zeroFill * 0x20) | (zeroMode * 0x10) | size);
   DWIN_Word(i, color);
   DWIN_Word(i, bColor);
   DWIN_Send(i);
 }
 
+// Animate a series of icons
+//  animID: Animation ID; 0x00-0x0F
+//  animate: true on; false off;
+//  libID: Icon library ID
+//  picIDs: Icon starting ID
+//  picIDe: Icon ending ID
+//  x/y: Upper-left point
+//  interval: Display time interval, unit 10mS
+void DWIN_ICON_Animation(uint8_t animID, bool animate, uint8_t libID, uint8_t picIDs, uint8_t picIDe, uint16_t x, uint16_t y, uint16_t interval) {
+  NOMORE(x, DWIN_WIDTH - 1);
+  NOMORE(y, DWIN_HEIGHT - 1); // -- ozy -- srl
+  size_t i = 0;
+  DWIN_Byte(i, 0x28);
+  DWIN_Word(i, x);
+  DWIN_Word(i, y);
+  // Bit 7: animation on or off
+  // Bit 6: start from begin or end
+  // Bit 5-4: unused (0)
+  // Bit 3-0: animID
+  DWIN_Byte(i, (animate * 0x80) | 0x40 | animID);
+  DWIN_Byte(i, libID);
+  DWIN_Byte(i, picIDs);
+  DWIN_Byte(i, picIDe);
+  DWIN_Byte(i, interval);
+  DWIN_Send(i);
+}
+
+// Animation Control
+//  state: 16 bits, each bit is the state of an animation id
+void DWIN_ICON_AnimationControl(uint16_t state) {
+  size_t i = 0;
+  DWIN_Byte(i, 0x28);
+  DWIN_Word(i, state);
+  DWIN_Send(i);
+}
+
+/*---------------------------------------- Memory functions ----------------------------------------*/
+// The LCD has an additional 32KB SRAM and 16KB Flash
+
+// Data can be written to the sram and save to one of the jpeg page files
+
+// Write Data Memory
+//  command 0x31
+//  Type: Write memory selection; 0x5A=SRAM; 0xA5=Flash
+//  Address: Write data memory address; 0x000-0x7FFF for SRAM; 0x000-0x3FFF for Flash
+//  Data: data
+//
+//  Flash writing returns 0xA5 0x4F 0x4B
+
+// Read Data Memory
+//  command 0x32
+//  Type: Read memory selection; 0x5A=SRAM; 0xA5=Flash
+//  Address: Read data memory address; 0x000-0x7FFF for SRAM; 0x000-0x3FFF for Flash
+//  Length: leangth of data to read; 0x01-0xF0
+//
+//  Response:
+//    Type, Address, Length, Data
+
+// Write Picture Memory
+//  Write the contents of the 32KB SRAM data memory into the designated image memory space
+//  Issued: 0x5A, 0xA5, PIC_ID
+//  Response: 0xA5 0x4F 0x4B
+//
+//  command 0x33
+//  0x5A, 0xA5
+//  PicId: Picture Memory location, 0x00-0x0F
+//
+//  Flash writing returns 0xA5 0x4F 0x4B
+
 #endif // DWIN_CREALITY_LCD

Marlin/src/lcd/dwin/dwin_lcd.h

 //  color: Clear screen color
 void DWIN_Frame_Clear(const uint16_t color);
 
+// Draw a point
+//  width: point width   0x01-0x0F
+//  height: point height 0x01-0x0F
+//  x,y: upper left point
+void DWIN_Draw_Point(uint8_t width, uint8_t height, uint16_t x, uint16_t y);
+
 // Draw a line
 //  color: Line segment color
 //  xStart/yStart: Start point
 //  x/y: Screen paste point
 void DWIN_Frame_AreaCopy(uint8_t cacheID, uint16_t xStart, uint16_t yStart,
                          uint16_t xEnd, uint16_t yEnd, uint16_t x, uint16_t y);
+
+// Animate a series of icons
+//  animID: Animation ID  up to 16
+//  animate: animation on or off
+//  libID: Icon library ID
+//  picIDs: Icon starting ID
+//  picIDe: Icon ending ID
+//  x/y: Upper-left point
+//  interval: Display time interval, unit 10mS
+void DWIN_ICON_Animation(uint8_t animID, bool animate, uint8_t libID, uint8_t picIDs, 
+                         uint8_t picIDe, uint16_t x, uint16_t y, uint16_t interval);
+
+// Animation Control
+//  state: 16 bits, each bit is the state of an animation id
+void DWIN_ICON_AnimationControl(uint16_t state);