⚡️ BTT002 (STM32F407VET6) variant, MK3_FAN_PINS flag (#23093)

Marlin/src/pins/pins.h

 #elif MB(BTT_GTR_V1_0)
   #include "stm32f4/pins_BTT_GTR_V1_0.h"        // STM32F4                                env:BIGTREE_GTR_V1_0 env:BIGTREE_GTR_V1_0_usb_flash_drive
 #elif MB(BTT_BTT002_V1_0)
-  #include "stm32f4/pins_BTT_BTT002_V1_0.h"     // STM32F4                                env:BIGTREE_BTT002
+  #include "stm32f4/pins_BTT_BTT002_V1_0.h"     // STM32F4                                env:BIGTREE_BTT002 env:BIGTREE_BTT002_VET6
 #elif MB(BTT_E3_RRF)
   #include "stm32f4/pins_BTT_E3_RRF.h"          // STM32F4                                env:BIGTREE_E3_RRF
 #elif MB(BTT_SKR_V2_0_REV_A)

Marlin/src/pins/stm32f4/pins_BTT_BTT002_V1_0.h

 
 #define BOARD_INFO_NAME "BTT BTT002 V1.0"
 
+//#define MK3_FAN_PINS
+
 #define USES_DIAG_PINS
 
 // Ignore temp readings during development.
 //
 #define HEATER_0_PIN                        PE6   // Heater0
 #define HEATER_BED_PIN                      PE5   // Hotbed
-#define FAN_PIN                             PB8   // Fan1
-#define FAN1_PIN                            PB9   // Fan0
+
+#ifndef FAN_PIN
+  #ifdef MK3_FAN_PINS
+    #define FAN_PIN                         PB8   // Fan1
+  #else
+    #define FAN_PIN                         PB9   // Fan0
+  #endif
+#endif
+
+#ifndef FAN1_PIN
+  #ifdef MK3_FAN_PINS
+    #define FAN1_PIN                        PB9   // Fan0
+  #else
+    #define FAN1_PIN                        PB8   // Fan1
+  #endif
+#endif
 
 /**
  * -----------------------------------BTT002 V1.0----------------------------------------

buildroot/share/PlatformIO/boards/marlin_BigTree_BTT002_VET6.json

+{
+  "build": {
+    "core": "stm32",
+    "cpu": "cortex-m4",
+    "extra_flags": "-DSTM32F4 -DSTM32F407xx -DSTM32F40_41xxx",
+    "f_cpu": "168000000L",
+    "hwids": [
+      [
+        "0x1EAF",
+        "0x0003"
+      ],
+      [
+        "0x0483",
+        "0x3748"
+      ]
+    ],
+    "mcu": "stm32f407vet6",
+    "variant": "MARLIN_BIGTREE_BTT002"
+  },
+  "debug": {
+    "jlink_device": "STM32F407VE",
+    "openocd_target": "stm32f4x",
+    "svd_path": "STM32F40x.svd"
+  },
+  "frameworks": [
+    "arduino"
+  ],
+  "name": "STM32F407VE (192k RAM. 512k Flash)",
+  "upload": {
+    "disable_flushing": false,
+    "maximum_ram_size": 131072,
+    "maximum_size": 524288,
+    "protocol": "stlink",
+    "protocols": [
+      "stlink",
+      "dfu",
+      "jlink"
+    ],
+    "offset_address": "0x8008000",
+    "require_upload_port": true,
+    "use_1200bps_touch": false,
+    "wait_for_upload_port": false
+  },
+  "url": "https://www.st.com/en/microcontrollers-microprocessors/stm32f407ve.html",
+  "vendor": "ST"
+}

ini/stm32f4.ini

                      -DPIN_SERIAL2_TX=PD_5
 
 #
+# BigTreeTech BTT002 V1.x with 512k of flash (STM32F407VET6 ARM Cortex-M4)
+#
+[env:BIGTREE_BTT002_VET6]
+platform          = ${env:BIGTREE_BTT002.platform}
+extends           = env:BIGTREE_BTT002
+board             = marlin_BigTree_BTT002_VET6
+
+#
 # BigTreeTech SKR V2.0 (STM32F407VGT6 ARM Cortex-M4) with USB Flash Drive Support
 #
 [env:BIGTREE_SKR_2]