added support for silently upgrading from old settings record w/o accelleration parameters

config.c

@@ -28,6 +28,17 @@
 
 settings_t settings;
 
+// Version 1 outdated settings record
+typedef struct {
+  double steps_per_mm[3];
+  uint8_t microsteps;
+  uint8_t pulse_microseconds;
+  double default_feed_rate;
+  double default_seek_rate;
+  uint8_t invert_mask;
+  double mm_per_arc_segment;
+} settings_v1_t;
+
 void reset_settings() {
   settings.steps_per_mm[0] = X_STEPS_PER_MM;
   settings.steps_per_mm[1] = Y_STEPS_PER_MM;
@@ -37,7 +48,7 @@ void reset_settings() {
   settings.default_seek_rate = RAPID_FEEDRATE;
   settings.acceleration = DEFAULT_ACCELERATION;
   settings.mm_per_arc_segment = MM_PER_ARC_SEGMENT;
-  settings.invert_mask = STEPPING_INVERT_MASK;
+  settings.invert_mask = DEFAULT_STEPPING_INVERT_MASK;
   settings.max_jerk = DEFAULT_MAX_JERK;
 }
 
@@ -57,22 +68,33 @@ void dump_settings() {
   printPgmString(PSTR("\r\n'$x=value' to set parameter or just '$' to dump current settings\r\n"));
 }
 
-int read_settings() {
-  // Check version-byte of eeprom
-  uint8_t version = eeprom_get_char(0);
-  if (version != SETTINGS_VERSION) { return(FALSE); }
-  // Read settings-record and check checksum
-  if (!(memcpy_from_eeprom_with_checksum((char*)&settings, 1, sizeof(settings_t)))) {
-    return(FALSE);
-  }
-  return(TRUE);
-}
-
 void write_settings() {
   eeprom_put_char(0, SETTINGS_VERSION);
   memcpy_to_eeprom_with_checksum(1, (char*)&settings, sizeof(settings_t));
 }
 
+int read_settings() {
+  // Check version-byte of eeprom
+  uint8_t version = eeprom_get_char(0);
+  
+  if (version == SETTINGS_VERSION) {
+    // Read settings-record and check checksum
+    if (!(memcpy_from_eeprom_with_checksum((char*)&settings, 1, sizeof(settings_t)))) {
+      return(FALSE);
+    }
+  } else if (version == 1) {
+    // Migrate from old settings version
+    if (!(memcpy_from_eeprom_with_checksum((char*)&settings, 1, sizeof(settings_v1_t)))) {
+      return(FALSE);
+    }
+    settings.acceleration = DEFAULT_ACCELERATION;
+    settings.max_jerk = DEFAULT_MAX_JERK;
+  } else {      
+    return(FALSE);
+  }
+  return(TRUE);
+}
+
 // A helper method to set settings from command line
 void store_setting(int parameter, double value) {
   switch(parameter) {
@@ -93,6 +115,7 @@ void store_setting(int parameter, double value) {
   printPgmString(PSTR("Stored new setting\r\n"));
 }
 
+// Initialize the config subsystem
 void config_init() {
   if(read_settings()) {
     printPgmString(PSTR("'$' to dump current settings\r\n"));

config.h

@@ -85,37 +85,20 @@ void dump_settings();
 // A helper method to set new settings from command line
 void store_setting(int parameter, double value);
 
-
 // Default settings (used when resetting eeprom-settings)
 #define MICROSTEPS 8
 #define X_STEPS_PER_MM (94.488188976378*MICROSTEPS)
 #define Y_STEPS_PER_MM (94.488188976378*MICROSTEPS)
 #define Z_STEPS_PER_MM (94.488188976378*MICROSTEPS)
 #define STEP_PULSE_MICROSECONDS 30
-
 #define MM_PER_ARC_SEGMENT 0.1
-
 #define RAPID_FEEDRATE 480.0 // in millimeters per minute
 #define DEFAULT_FEEDRATE 480.0
 #define DEFAULT_ACCELERATION (DEFAULT_FEEDRATE/100.0)
 #define DEFAULT_MAX_JERK 50.0
-
+#define DEFAULT_STEPPING_INVERT_MASK 0
-// Use this line for default operation (step-pulses high)
-#define STEPPING_INVERT_MASK 0
-// Uncomment this line for inverted stepping (step-pulses low, rest high)
-// #define STEPPING_INVERT_MASK (STEP_MASK)
-// Uncomment this line to invert all step- and direction bits
-// #define STEPPING_INVERT_MASK (STEPPING_MASK)
-// Or bake your own like this adding any step-bits or directions you want to invert:
-// #define STEPPING_INVERT_MASK (STEP_MASK | (1<<X_DIRECTION_BIT) | (1<<Y_DIRECTION_BIT))
 
 // The temporal resolution of the acceleration management subsystem
 #define ACCELERATION_TICKS_PER_SECOND 10L
 
-// Some useful constants
-#define STEP_MASK ((1<<X_STEP_BIT)|(1<<Y_STEP_BIT)|(1<<Z_STEP_BIT)) // All step bits
-#define DIRECTION_MASK ((1<<X_DIRECTION_BIT)|(1<<Y_DIRECTION_BIT)|(1<<Z_DIRECTION_BIT)) // All direction bits
-#define STEPPING_MASK (STEP_MASK | DIRECTION_MASK) // All stepping-related bits (step/direction)
-#define LIMIT_MASK ((1<<X_LIMIT_BIT)|(1<<Y_LIMIT_BIT)|(1<<Z_LIMIT_BIT)) // All limit bits
-
 #endif