✨ Configurations embed and retrieve (#21321, #23303)

Marlin/Configuration_adv.h

@@ -1593,6 +1593,14 @@
     #define SD_FIRMWARE_UPDATE_INACTIVE_VALUE 0xFF
   #endif
 
+  /**
+   * Enable this option if you have more than ~3K of unused flash space.
+   * Marlin will embed all settings in the firmware binary as compressed data.
+   * Use 'M503 C' to write the settings out to the SD Card as 'mc.zip'.
+   * See docs/ConfigEmbedding.md for details on how to use 'mc-apply.py'.
+   */
+  //#define CONFIGURATION_EMBEDDING
+
   // Add an optimized binary file transfer mode, initiated with 'M28 B1'
   //#define BINARY_FILE_TRANSFER
 

Marlin/src/gcode/eeprom/M500-M504.cpp

@@ -25,6 +25,11 @@
 #include "../../core/serial.h"
 #include "../../inc/MarlinConfig.h"
 
+#if ENABLED(CONFIGURATION_EMBEDDING)
+  #include "../../sd/SdBaseFile.h"
+  #include "../../mczip.h"
+#endif
+
 /**
  * M500: Store settings in EEPROM
  */
@@ -50,9 +55,22 @@ void GcodeSuite::M502() {
 
   /**
    * M503: print settings currently in memory
+   *
+   * With CONFIGURATION_EMBEDDING:
+   *   C<flag> : Save the full Marlin configuration to SD Card as "mc.zip"
    */
   void GcodeSuite::M503() {
     (void)settings.report(!parser.boolval('S', true));
+
+    #if ENABLED(CONFIGURATION_EMBEDDING)
+      if (parser.seen_test('C')) {
+        SdBaseFile file;
+        const uint16_t size = sizeof(mc_zip);
+        // Need to create the config size on the SD card
+        if (file.open("mc.zip", O_WRITE|O_CREAT) && file.write(pgm_read_ptr(mc_zip), size) != -1 && file.close())
+          SERIAL_ECHO_MSG("Configuration saved as 'mc.zip'");
+      }
+    #endif
   }
 
 #endif // !DISABLE_M503

Marlin/src/gcode/host/M115.cpp

@@ -24,7 +24,6 @@
 #include "../../inc/MarlinConfig.h"
 #include "../queue.h"           // for getting the command port
 
-
 #if ENABLED(M115_GEOMETRY_REPORT)
   #include "../../module/motion.h"
 #endif
@@ -33,13 +32,25 @@
   #include "../../feature/caselight.h"
 #endif
 
+//#define MINIMAL_CAP_LINES // Don't even mention the disabled capabilities
+
 #if ENABLED(EXTENDED_CAPABILITIES_REPORT)
-  static void cap_line(FSTR_P const name, bool ena=false) {
-    SERIAL_ECHOPGM("Cap:");
-    SERIAL_ECHOF(name);
-    SERIAL_CHAR(':', '0' + ena);
-    SERIAL_EOL();
-  }
+  #if ENABLED(MINIMAL_CAP_LINES)
+    #define cap_line(S,C) if (C) _cap_line(S)
+    static void _cap_line(FSTR_P const name) {
+      SERIAL_ECHOPGM("Cap:");
+      SERIAL_ECHOF(name);
+      SERIAL_ECHOLNPGM(":1");
+    }
+  #else
+    #define cap_line(V...) _cap_line(V)
+    static void _cap_line(FSTR_P const name, bool ena=false) {
+      SERIAL_ECHOPGM("Cap:");
+      SERIAL_ECHOF(name);
+      SERIAL_CHAR(':', '0' + ena);
+      SERIAL_EOL();
+    }
+  #endif
 #endif
 
 /**
@@ -167,6 +178,9 @@ void GcodeSuite::M115() {
     // MEATPACK Compression
     cap_line(F("MEATPACK"), SERIAL_IMPL.has_feature(port, SerialFeature::MeatPack));
 
+    // CONFIG_EXPORT
+    cap_line(F("CONFIG_EXPORT"), ENABLED(CONFIG_EMBED_AND_SAVE_TO_SD));
+
     // Machine Geometry
     #if ENABLED(M115_GEOMETRY_REPORT)
       const xyz_pos_t bmin = { 0, 0, 0 },

Marlin/src/inc/Conditionals_adv.h

@@ -1004,3 +1004,9 @@
 #if EITHER(MEATPACK_ON_SERIAL_PORT_1, MEATPACK_ON_SERIAL_PORT_2)
   #define HAS_MEATPACK 1
 #endif
+
+// AVR are (usually) too limited in resources to store the configuration into the binary
+#if !defined(FORCE_CONFIG_EMBED) && (defined(__AVR__) || DISABLED(SDSUPPORT) || EITHER(SDCARD_READONLY, DISABLE_M503))
+  #undef CONFIGURATION_EMBEDDING
+  #define CANNOT_EMBED_CONFIGURATION defined(__AVR__)
+#endif

Marlin/src/inc/Warnings.cpp

@@ -549,3 +549,7 @@
 #elif !USE_SENSORLESS && ENABLED(USES_DIAG_PINS)
   #warning "Driver DIAG pins must be physically removed unless SENSORLESS_HOMING is enabled. (See https://bit.ly/2ZPRlt0)"
 #endif
+
+#if CANNOT_EMBED_CONFIGURATION
+  #warning "Disabled CONFIGURATION_EMBEDDING because the target usually has less flash storage. Define FORCE_CONFIG_EMBED to override."
+#endif

Marlin/src/pins/stm32g0/pins_BTT_SKR_MINI_E3_V3_0.h

@@ -150,7 +150,7 @@
  *  (LCD_D4) PB9  | 5  6   PA10 (BTN_EN2)
  *          RESET | 7  8 | PA9  (BTN_EN1)
  * (BTN_ENC) PA15 | 9 10 | PB5  (BEEPER)
- *                 ------ 
+ *                 ------
  *                  EXP1
  */
 #define EXP1_09_PIN                         PA15