Add Lerdge S,X,K (#18302)

platformio.ini

@@ -821,6 +821,46 @@ build_flags       = ${common_stm32.build_flags}
 extra_scripts     = pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
 lib_ignore        = Adafruit NeoPixel, SailfishLCD, SlowSoftI2CMaster, SoftwareSerial
 
+#
+# Lerdge base
+#
+[lerdge_common]
+platform           = ${common_stm32.platform}
+extends            = common_stm32
+board              = LERDGE
+board_build.offset = 0x10000
+extra_scripts      = pre:buildroot/share/PlatformIO/scripts/copy_marlin_variant_to_framework.py
+                     buildroot/share/PlatformIO/scripts/stm32_bootloader.py
+                     buildroot/share/PlatformIO/scripts/lerdge.py
+build_flags        = ${common_stm32.build_flags}
+  -DSTM32F4 -DSTM32F4xx -DTARGET_STM32F4
+  -DDISABLE_GENERIC_SERIALUSB -DARDUINO_ARCH_STM32 -DARDUINO_LERDGE
+  -DTRANSFER_CLOCK_DIV=8
+build_unflags      = ${common_stm32.build_unflags} -DUSBCON -DUSBD_USE_CDC -DUSBD_VID=0x0483
+
+#
+# Lerdge X
+#
+[env:LERDGEX]
+extends              = lerdge_common
+board_build.firmware = Lerdge_X_firmware_force.bin
+
+#
+# Lerdge S
+#
+[env:LERDGES]
+extends              = lerdge_common
+board_build.firmware = Lerdge_firmware_force.bin
+
+#
+# Lerdge K
+#
+[env:LERDGEK]
+extends              = lerdge_common
+board_build.firmware = Lerdge_K_firmware_force.bin
+build_flags          = ${lerdge_common.build_flags}
+  -DLERDGEK
+
 #
 # RUMBA32
 #