Merge pull request #6373 from mtowara/mt_makefile_fix

Fix Makefile build

Marlin/Makefile

 	temperature.cpp cardreader.cpp configuration_store.cpp \
 	watchdog.cpp SPI.cpp servo.cpp Tone.cpp ultralcd.cpp digipot_mcp4451.cpp \
 	dac_mcp4728.cpp vector_3.cpp qr_solve.cpp endstops.cpp stopwatch.cpp utility.cpp \
-	printcounter.cpp nozzle.cpp
+	printcounter.cpp nozzle.cpp serial.cpp
 ifeq ($(LIQUID_TWI2), 0)
 CXXSRC += LiquidCrystal.cpp
 else

Marlin/pinsDebug.h

 
 // manually add pins that have names that are macros which don't play well with these macros
 #if SERIAL_PORT == 0 && (AVR_ATmega2560_FAMILY || AVR_ATmega1284_FAMILY)
-  static const unsigned char RXD_NAME[] PROGMEM = {"RXD"};
-  static const unsigned char TXD_NAME[] PROGMEM = {"TXD"};
+  static const char RXD_NAME[] PROGMEM = {"RXD"};
+  static const char TXD_NAME[] PROGMEM = {"TXD"};
 #endif
 
 /////////////////////////////////////////////////////////////////////////////
   // manually add pins ...
   #if SERIAL_PORT == 0
     #if AVR_ATmega2560_FAMILY
-      {RXD_NAME, 0, 1},
-      {TXD_NAME, 1, 1},
+      {RXD_NAME, "0", "1"},
+      {TXD_NAME, "1", "1"},
     #elif AVR_ATmega1284_FAMILY
-      {RXD_NAME, 8, 1},
-      {TXD_NAME, 9, 1},
+      {RXD_NAME, "8", "1"},
+      {TXD_NAME, "9", "1"},
     #endif
   #endif
 
 
 
 
-const uint8_t* const PWM_other[][3] PROGMEM = {
+const volatile uint8_t* const PWM_other[][3] PROGMEM = {
     {&TCCR0A, &TCCR0B, &TIMSK0},
     {&TCCR1A, &TCCR1B, &TIMSK1},
   #if defined(TCCR2A) && defined(COM2A1)
 };
 
 
-const uint8_t* const PWM_OCR[][3] PROGMEM = {
+const volatile uint8_t* const PWM_OCR[][3] PROGMEM = {
 
   #ifdef TIMER0A
     {&OCR0A,&OCR0B,0},