Homing direction pin bits fixed. Lite refactoring of settings.

limits.c

@@ -80,9 +80,8 @@ static void homing_cycle(bool x_axis, bool y_axis, bool z_axis, int8_t pos_dir,
   uint32_t dt_min = lround(1000000*60/(ds*homing_rate)); // Cruising (usec/step)
   uint32_t dt = 1000000*60/MINIMUM_STEPS_PER_MINUTE; // Initial (usec/step)
       
-  // Determine default out_bits set. Direction fixed and step pin inverted
+  // Set default out_bits. 
-  uint8_t out_bits0 = DIRECTION_MASK; 
+  uint8_t out_bits0 = settings.invert_mask;
-  out_bits0 ^= settings.invert_mask;  // Apply the global step and direction invert mask
   if (!pos_dir) { out_bits0 ^= DIRECTION_MASK; }   // Invert bits, if negative dir.
   
   // Initialize stepping variables

settings.c

@@ -75,9 +75,12 @@ typedef struct {
 #define DEFAULT_HOMING_DEBOUNCE_DELAY 100 // msec (0-65k)
 #define DEFAULT_STEPPER_IDLE_LOCK_TIME 25 // msec (0-255)
 // #define DEFAULT_AUTO_START 1 // true
+// #define DEFAULT_INCHES_MODE 1 // true
 // #define DEFAULT_BLOCK_DELETE 0  // false
 
-void settings_reset() {
+void settings_reset(bool reset_all) {
+  // Reset all settings or only the migration settings to the new version.
+  if (reset_all) {
     settings.steps_per_mm[X_AXIS] = DEFAULT_X_STEPS_PER_MM;
     settings.steps_per_mm[Y_AXIS] = DEFAULT_Y_STEPS_PER_MM;
     settings.steps_per_mm[Z_AXIS] = DEFAULT_Z_STEPS_PER_MM;
@@ -89,6 +92,16 @@ void settings_reset() {
     settings.invert_mask = DEFAULT_STEPPING_INVERT_MASK;
     settings.junction_deviation = DEFAULT_JUNCTION_DEVIATION;
   }
+  // New settings since last version
+  settings.flags = 0;
+  // if (DEFAULT_AUTO_START) { settings.flags |= FLAG_BIT_AUTO_START; }
+  // if (DEFAULT_INCHES_MODE) { settings.flags |= FLAG_BIT_INCHES_MODE; }
+  if (DEFAULT_HOMING_ENABLE) { settings.flags |= FLAG_BIT_HOMING_ENABLE; }  
+  settings.homing_feed_rate = DEFAULT_HOMING_FEEDRATE;
+  settings.homing_seek_rate = DEFAULT_HOMING_RAPID_FEEDRATE;
+  settings.homing_debounce_delay = DEFAULT_HOMING_DEBOUNCE_DELAY;
+  settings.stepper_idle_lock_time = DEFAULT_STEPPER_IDLE_LOCK_TIME;
+}
 
 void settings_dump() {
   printPgmString(PSTR("$0 = ")); printFloat(settings.steps_per_mm[X_AXIS]);
@@ -107,7 +120,7 @@ void settings_dump() {
   printPgmString(PSTR(" (mm/min homing feed rate)\r\n$12 = ")); printFloat(settings.homing_seek_rate);
   printPgmString(PSTR(" (mm/min homing seek rate)\r\n$13 = ")); printInteger(settings.homing_debounce_delay);
   printPgmString(PSTR(" (milliseconds homing debounce delay)\r\n$14 = ")); printInteger(settings.stepper_idle_lock_time);
-  printPgmString(PSTR(" (milliseconds stepper idle lock time)\r\n")); 
+  printPgmString(PSTR(" (milliseconds stepper idle lock time)")); 
   printPgmString(PSTR("\r\n'$x=value' to set parameter or just '$' to dump current settings\r\n"));
 }
 
@@ -173,17 +186,8 @@ int read_settings() {
       if (!(memcpy_from_eeprom_with_checksum((char*)&settings, 1, sizeof(settings_v2_v4_t)))) {
         return(false);
       }     
-      
+      settings_reset(false);        
-      settings.flags = 0;
-      // if (DEFAULT_AUTO_START) { settings.flags |= FLAG_BIT_AUTO_START; }
-      if (DEFAULT_HOMING_ENABLE) { settings.flags |= FLAG_BIT_HOMING_ENABLE; }  
-      settings.homing_feed_rate = DEFAULT_HOMING_FEEDRATE;
-      settings.homing_seek_rate = DEFAULT_HOMING_RAPID_FEEDRATE;
-      settings.homing_debounce_delay = DEFAULT_HOMING_DEBOUNCE_DELAY;
-      settings.stepper_idle_lock_time = DEFAULT_STEPPER_IDLE_LOCK_TIME;
-        
       write_settings();
-      
     } else if (version >= 50) {
       // Developmental settings. Version numbers greater than or equal to 50 are temporary.
       // Currently, this will update the user settings to v4 and the remainder of the settings
@@ -191,17 +195,8 @@ int read_settings() {
       
       // Grab settings regardless of error.
       memcpy_from_eeprom_with_checksum((char*)&settings, 1, sizeof(settings_t));
-
+      settings_reset(false);
-      settings.flags = 0;
-      // if (DEFAULT_AUTO_START) { settings.flags |= FLAG_BIT_AUTO_START; }
-      if (DEFAULT_HOMING_ENABLE) { settings.flags |= FLAG_BIT_HOMING_ENABLE; }  
-      settings.homing_feed_rate = DEFAULT_HOMING_FEEDRATE;
-      settings.homing_seek_rate = DEFAULT_HOMING_RAPID_FEEDRATE;
-      settings.homing_debounce_delay = DEFAULT_HOMING_DEBOUNCE_DELAY;
-      settings.stepper_idle_lock_time = DEFAULT_STEPPER_IDLE_LOCK_TIME;
-      
       write_settings();
-      
     } else {      
       return(false);
     }
@@ -252,7 +247,7 @@ void settings_store_setting(int parameter, float value) {
 void settings_init() {
   if(!read_settings()) {
     printPgmString(PSTR("Warning: Failed to read EEPROM settings. Using defaults.\r\n"));
-    settings_reset();
+    settings_reset(true);
     write_settings();
     settings_dump();
   }

settings.h

@@ -29,11 +29,12 @@
 
 // Version of the EEPROM data. Will be used to migrate existing data from older versions of Grbl
 // when firmware is upgraded. Always stored in byte 0 of eeprom
-#define SETTINGS_VERSION 50
+#define SETTINGS_VERSION 51
 
 // Define bit flag masks in settings.flag.
 #define FLAG_BIT_HOMING_ENABLE      bit(0)
 //#define FLAG_BIT_AUTO_START         bit(1)
+//#define FLAG_BIT_INCHES_MODE            bit(2)
 
 // Current global settings (persisted in EEPROM from byte 1 onwards)
 typedef struct {