Support inches, fahrenheit, and kelvin

.travis.yml

@@ -105,10 +105,10 @@ script:
   - opt_enable NUM_SERVOS Z_ENDSTOP_SERVO_NR SERVO_ENDSTOP_ANGLES DEACTIVATE_SERVOS_AFTER_MOVE
   - build_marlin
   #
-  # Test EEPROM_SETTINGS & EEPROM_CHITCHAT
+  # Test EEPROM_SETTINGS, EEPROM_CHITCHAT, M100_FREE_MEMORY_WATCHER, INCH_MODE_SUPPORT, TEMPERATURE_UNITS_SUPPORT
   #
   - restore_configs
-  - opt_enable EEPROM_SETTINGS EEPROM_CHITCHAT
+  - opt_enable EEPROM_SETTINGS EEPROM_CHITCHAT M100_FREE_MEMORY_WATCHER INCH_MODE_SUPPORT TEMPERATURE_UNITS_SUPPORT
   - build_marlin
   #
   # Test DUAL_X_CARRIAGE

Marlin/Configuration.h

@@ -749,6 +749,16 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 //
 //#define M100_FREE_MEMORY_WATCHER // uncomment to add the M100 Free Memory Watcher for debug purpose
 
+//
+// G20/G21 Inch mode support
+//
+//#define INCH_MODE_SUPPORT
+
+//
+// M149 Set temperature units support
+//
+//#define TEMPERATURE_UNITS_SUPPORT
+
 // @section temperature
 
 // Preheat Constants

Marlin/M100_Free_Mem_Chk.cpp

@@ -47,22 +47,6 @@ extern void* __brkval;
 extern size_t  __heap_start, __heap_end, __flp;
 
 
-//
-// Declare all the functions we need from Marlin_Main.cpp to do the work!
-//
-
-float code_value();
-long code_value_long();
-bool code_seen(char);
-void serial_echopair_P(const char*, float);
-void serial_echopair_P(const char*, double);
-void serial_echopair_P(const char*, unsigned long);
-void serial_echopair_P(const char*, int);
-void serial_echopair_P(const char*, long);
-
-
-
-
 //
 // Utility functions used by M100 to get its work done.
 //
@@ -176,8 +160,7 @@ void gcode_M100() {
   //
 #if ENABLED(M100_FREE_MEMORY_CORRUPTOR)
   if (code_seen('C')) {
-    int x;      // x gets the # of locations to corrupt within the memory pool
-    x = code_value();
+    int x = code_value_int(); // x gets the # of locations to corrupt within the memory pool
     SERIAL_ECHOLNPGM("Corrupting free memory block.\n");
     ptr = (unsigned char*) __brkval;
     SERIAL_ECHOPAIR("\n__brkval : ", ptr);

Marlin/Marlin.h

@@ -217,6 +217,9 @@ enum AxisEnum {NO_AXIS = -1, X_AXIS = 0, A_AXIS = 0, Y_AXIS = 1, B_AXIS = 1, Z_A
 
 #define _AXIS(AXIS) AXIS ##_AXIS
 
+typedef enum { LINEARUNIT_MM = 0, LINEARUNIT_INCH = 1 } LinearUnit;
+typedef enum { TEMPUNIT_C = 0, TEMPUNIT_K = 1, TEMPUNIT_F = 2 } TempUnit;
+
 void enable_all_steppers();
 void disable_all_steppers();
 
@@ -288,9 +291,9 @@ extern bool axis_homed[3]; // axis[n].is_homed
 
 // GCode support for external objects
 bool code_seen(char);
-float code_value();
-long code_value_long();
-int16_t code_value_short();
+int code_value_int();
+float code_value_temp_abs();
+float code_value_temp_diff();
 
 #if ENABLED(DELTA)
   extern float delta[3];