✨ Option to reset EEPROM on first run (#23276)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/Configuration.h

 #define EEPROM_BOOT_SILENT    // Keep M503 quiet and only give errors during first load
 #if ENABLED(EEPROM_SETTINGS)
   //#define EEPROM_AUTO_INIT  // Init EEPROM automatically on any errors.
+  //#define EEPROM_INIT_NOW   // Init EEPROM on first boot after a new build.
 #endif
 
 //

Marlin/src/module/settings.cpp

  */
 
 // Change EEPROM version if the structure changes
-#define EEPROM_VERSION "V85"
+#define EEPROM_VERSION "V86"
 #define EEPROM_OFFSET 100
 
 // Check the integrity of data offsets.
  */
 typedef struct SettingsDataStruct {
   char      version[4];                                 // Vnn\0
+  #if ENABLED(EEPROM_INIT_NOW)
+    uint32_t build_hash;                                // Unique build hash
+  #endif
   uint16_t  crc;                                        // Data Checksum
 
   //
   // DISTINCT_E_FACTORS
   //
-  uint8_t   esteppers;                                  // DISTINCT_AXES - LINEAR_AXES
+  uint8_t e_factors;                                    // DISTINCT_AXES - LINEAR_AXES
 
+  //
+  // Planner settings
+  //
   planner_settings_t planner_settings;
 
   xyze_float_t planner_max_jerk;                        // M205 XYZE  planner.max_jerk
   float planner_junction_deviation_mm;                  // M205 J     planner.junction_deviation_mm
 
+  //
+  // Home Offset
+  //
   xyz_pos_t home_offset;                                // M206 XYZ / M665 TPZ
 
+  //
+  // Hotend Offset
+  //
   #if HAS_HOTEND_OFFSET
     xyz_pos_t hotend_offset[HOTENDS - 1];               // M218 XYZ
   #endif
 
   const char version[4] = EEPROM_VERSION;
 
+  #if ENABLED(EEPROM_INIT_NOW)
+    constexpr uint32_t strhash32(const char *s, const uint32_t h=0) {
+      return *s ? strhash32(s + 1, ((h + *s) << (*s & 3)) ^ *s) : h;
+    }
+    constexpr uint32_t build_hash = strhash32(__DATE__ __TIME__);
+  #endif
+
   bool MarlinSettings::eeprom_error, MarlinSettings::validating;
   int MarlinSettings::eeprom_index;
   uint16_t MarlinSettings::working_crc;
 
   bool MarlinSettings::size_error(const uint16_t size) {
     if (size != datasize()) {
-      DEBUG_ERROR_MSG("EEPROM datasize error.");
+      DEBUG_ERROR_MSG("EEPROM datasize error."
+        #if ENABLED(MARLIN_DEV_MODE)
+          " (Actual:", size, " Expected:", datasize(), ")"
+        #endif
+      );
       return true;
     }
     return false;
     // Write or Skip version. (Flash doesn't allow rewrite without erase.)
     TERN(FLASH_EEPROM_EMULATION, EEPROM_SKIP, EEPROM_WRITE)(ver);
 
-    EEPROM_SKIP(working_crc); // Skip the checksum slot
+    #if ENABLED(EEPROM_INIT_NOW)
+      EEPROM_SKIP(build_hash);  // Skip the hash slot
+    #endif
+
+    EEPROM_SKIP(working_crc);   // Skip the checksum slot
 
     working_crc = 0; // clear before first "real data"
 
-    const uint8_t esteppers = COUNT(planner.settings.axis_steps_per_mm) - LINEAR_AXES;
-    _FIELD_TEST(esteppers);
-    EEPROM_WRITE(esteppers);
+    const uint8_t e_factors = DISTINCT_AXES - (LINEAR_AXES);
+    _FIELD_TEST(e_factors);
+    EEPROM_WRITE(e_factors);
 
     //
     // Planner Motion
       eeprom_index = EEPROM_OFFSET;
 
       EEPROM_WRITE(version);
+      #if ENABLED(EEPROM_INIT_NOW)
+        EEPROM_WRITE(build_hash);
+      #endif
       EEPROM_WRITE(final_crc);
 
       // Report storage size
     char stored_ver[4];
     EEPROM_READ_ALWAYS(stored_ver);
 
-    uint16_t stored_crc;
-    EEPROM_READ_ALWAYS(stored_crc);
-
     // Version has to match or defaults are used
     if (strncmp(version, stored_ver, 3) != 0) {
       if (stored_ver[3] != '\0') {
       eeprom_error = true;
     }
     else {
+
+      // Optionally reset on the first boot after flashing
+      #if ENABLED(EEPROM_INIT_NOW)
+        uint32_t stored_hash;
+        EEPROM_READ_ALWAYS(stored_hash);
+        if (stored_hash != build_hash) { EEPROM_FINISH(); return true; }
+      #endif
+
+      uint16_t stored_crc;
+      EEPROM_READ_ALWAYS(stored_crc);
+
       float dummyf = 0;
       working_crc = 0;  // Init to 0. Accumulated by EEPROM_READ
 
-      _FIELD_TEST(esteppers);
+      _FIELD_TEST(e_factors);
 
-      // Number of esteppers may change
-      uint8_t esteppers;
-      EEPROM_READ_ALWAYS(esteppers);
+      // Number of e_factors may change
+      uint8_t e_factors;
+      EEPROM_READ_ALWAYS(e_factors);
 
       //
       // Planner Motion
       {
         // Get only the number of E stepper parameters previously stored
         // Any steppers added later are set to their defaults
-        uint32_t tmp1[LINEAR_AXES + esteppers];
-        float tmp2[LINEAR_AXES + esteppers];
-        feedRate_t tmp3[LINEAR_AXES + esteppers];
+        uint32_t tmp1[LINEAR_AXES + e_factors];
+        float tmp2[LINEAR_AXES + e_factors];
+        feedRate_t tmp3[LINEAR_AXES + e_factors];
         EEPROM_READ((uint8_t *)tmp1, sizeof(tmp1)); // max_acceleration_mm_per_s2
         EEPROM_READ(planner.settings.min_segment_time_us);
         EEPROM_READ((uint8_t *)tmp2, sizeof(tmp2)); // axis_steps_per_mm
         EEPROM_READ((uint8_t *)tmp3, sizeof(tmp3)); // max_feedrate_mm_s
 
         if (!validating) LOOP_DISTINCT_AXES(i) {
-          const bool in = (i < esteppers + LINEAR_AXES);
+          const bool in = (i < e_factors + LINEAR_AXES);
           planner.settings.max_acceleration_mm_per_s2[i] = in ? tmp1[i] : pgm_read_dword(&_DMA[ALIM(i, _DMA)]);
           planner.settings.axis_steps_per_mm[i]          = in ? tmp2[i] : pgm_read_float(&_DASU[ALIM(i, _DASU)]);
           planner.settings.max_feedrate_mm_s[i]          = in ? tmp3[i] : pgm_read_float(&_DMF[ALIM(i, _DMF)]);
       return success;
     }
     reset();
-    #if ENABLED(EEPROM_AUTO_INIT)
+    #if EITHER(EEPROM_AUTO_INIT, EEPROM_INIT_NOW)
       (void)save();
       SERIAL_ECHO_MSG("EEPROM Initialized");
     #endif

buildroot/share/PlatformIO/scripts/preflight-checks.py

 		#
 		# Give warnings on every build
 		#
-		warnfile = os.path.join(env['PROJECT_BUILD_DIR'], build_env, "src", "src", "inc", "Warnings.cpp.o")
+		srcpath = os.path.join(env['PROJECT_BUILD_DIR'], build_env, "src", "src")
+		warnfile = os.path.join(srcpath, "inc", "Warnings.cpp.o")
 		if os.path.exists(warnfile):
 			os.remove(warnfile)
 
 		#
+		# Rebuild 'settings.cpp' for EEPROM_INIT_NOW
+		#
+		if 'EEPROM_INIT_NOW' in env['MARLIN_FEATURES']:
+			setfile = os.path.join(srcpath, "module", "settings.cpp.o")
+			if os.path.exists(setfile):
+				os.remove(setfile)
+
+		#
 		# Check for old files indicating an entangled Marlin (mixing old and new code)
 		#
 		mixedin = []