Malyan LCD feedrate, better temp handling.

Marlin/src/lcd/malyanlcd.cpp

 // Track incoming command bytes from the LCD
 int inbound_count;
 
+// For sending print completion messages
+bool last_printing_status = false;
+uint8_t last_percent_done = 100;
+
 // Everything written needs the high bit set.
 void write_to_lcd_P(const char * const message) {
   char encoded_message[MAX_CURLY_COMMAND];
  * {C:P050}
  * Set temp for bed to 50
  *
+ * {C:S09} set feedrate to 90 %.
+ * {C:S12} set feedrate to 120 %.
+ *
  * the command portion begins after the :
  */
 void process_lcd_c_command(const char* command) {
   switch (command[0]) {
+    case 'C': {
+      int raw_feedrate = atoi(command + 1);
+      feedrate_percentage = raw_feedrate * 10;
+      feedrate_percentage = constrain(feedrate_percentage, 10, 999);
+    } break;
     case 'T': {
-      // M104 S<temperature>
-      char cmd[20];
-      sprintf_P(cmd, PSTR("M104 S%s"), command + 1);
-      enqueue_and_echo_command_now(cmd);
+      thermalManager.setTargetHotend(atoi(command + 1), 0);
     } break;
-
     case 'P': {
-      // M140 S<temperature>
-      char cmd[20];
-      sprintf_P(cmd, PSTR("M140 S%s"), command + 1);
-      enqueue_and_echo_command_now(cmd);
+      thermalManager.setTargetBed(atoi(command + 1));
     } break;
 
     default:
       #if ENABLED(SDSUPPORT)
         // cancel print
         write_to_lcd_P(PSTR("{SYS:CANCELING}"));
+        last_printing_status = false;
         card.stopSDPrint(
           #if SD_RESORT
             true
         }
         else {
           char message_buffer[MAX_CURLY_COMMAND];
-          sprintf_P(message_buffer, PSTR("{PRINTFILE:%s}"), card.filename);
+          sprintf_P(message_buffer, PSTR("{PRINTFILE:%s}"), card.longest_filename());
           write_to_lcd(message_buffer);
           write_to_lcd_P(PSTR("{SYS:BUILD}"));
           card.openAndPrintFile(card.filename);
 
     case 'H':
       // Home all axis
-      enqueue_and_echo_command("G28");
+      enqueue_and_echo_command("G28", false);
       break;
 
     case 'L': {
         uint16_t file_count = card.get_num_Files();
         for (uint16_t i = 0; i < file_count; i++) {
           card.getfilename(i);
-          sprintf_P(message_buffer, card.filenameIsDir ? PSTR("{DIR:%s}") : PSTR("{FILE:%s}"), card.filename);
+          sprintf_P(message_buffer, card.filenameIsDir ? PSTR("{DIR:%s}") : PSTR("{FILE:%s}"), card.longest_filename());
           write_to_lcd(message_buffer);
         }
 
 /**
  * UC means connected.
  * UD means disconnected
- * The stock firmware considers USB initialied as "connected."
+ * The stock firmware considers USB initialized as "connected."
  */
 void update_usb_status(const bool forceUpdate) {
   static bool last_usb_connected_status = false;
   }
 
   #if ENABLED(SDSUPPORT)
-    // If there's a print in progress, we need to emit the status as
-    // {TQ:<PERCENT>}
+    // The way last printing status works is simple:
+    // The UI needs to see at least one TQ which is not 100%
+    // and then when the print is complete, one which is.
     if (card.sdprinting) {
-      // We also need to send: T:-2538.0 E:0
-      // I have no idea what this means.
-      char message_buffer[10];
-      sprintf_P(message_buffer, PSTR("{TQ:%03i}"), card.percentDone());
-      write_to_lcd(message_buffer);
+      if (card.percentDone() != last_percent_done) {
+        char message_buffer[10];
+        last_percent_done = card.percentDone();
+        sprintf_P(message_buffer, PSTR("{TQ:%03i}"), last_percent_done);
+        write_to_lcd(message_buffer);
+
+        if (!last_printing_status) last_printing_status = true;
+      }
+    }
+    else {
+      // If there was a print in progress, we need to emit the final
+      // print status as {TQ:100}. Reset last percent done so a new print will
+      // issue a percent of 0.
+      if (last_printing_status) {
+        last_printing_status = false;
+        last_percent_done = 100;
+        write_to_lcd_P(PSTR("{TQ:100}"));
+      }
     }
   #endif
 }