PIO env for MKS Nano boards in STM32 (#19905)

Marlin/src/pins/stm32f1/pins_MKS_ROBIN_NANO_V2.h

  * MKS Robin nano (STM32F130VET6) board pin assignments
  */
 
-#if NOT_TARGET(__STM32F1__)
+#if NOT_TARGET(__STM32F1__, STM32F1)
   #error "Oops! Select an STM32F1 board in 'Tools > Board.'"
 #elif HOTENDS > 2 || E_STEPPERS > 2
   #error "MKS Robin nano supports up to 2 hotends / E-steppers. Comment out this line to continue."

platformio.ini

 # RUMBA32
 #
 [env:rumba32]
-platform      = ${common_stm32.platform}
-extends       = common_stm32
-build_flags   = ${common_stm32.build_flags}
+platform        = ${common_stm32.platform}
+extends         = common_stm32
+build_flags     = ${common_stm32.build_flags}
   -Os
   -DHAL_PCD_MODULE_ENABLED
   -DDISABLE_GENERIC_SERIALUSB
   -DHAL_UART_MODULE_ENABLED
   -DTIMER_SERIAL=TIM9
-board         = rumba32_f446ve
+board           = rumba32_f446ve
 upload_protocol = dfu
-monitor_speed = 500000
+monitor_speed   = 500000
+
+#
+# MKS Robin Nano V1.2 and V2 using hal STM32
+#
+[env:mks_robin_nano35_stm32]
+platform             = ${common_stm32.platform}
+extends              = common_stm32
+build_flags          = ${common_stm32.build_flags} -DMCU_STM32F103VE -DSS_TIMER=4 -DENABLE_HWSERIAL3 -DTRANSFER_CLOCK_DIV=8
+board                = genericSTM32F103VE
+board_build.core     = stm32
+board_build.variant  = MARLIN_F103Vx
+board_build.ldscript = ldscript.ld
+board_build.offset   = 0x7000
+board_build.firmware = Robin_nano35.bin
+board_upload.offset_address = 0x08007000
+build_unflags        = ${common_stm32.build_unflags} -DUSBCON -DUSBD_USE_CDC
+debug_tool           = jlink
+upload_protocol      = jlink
+extra_scripts        = ${common.extra_scripts}
+  pre:buildroot/share/PlatformIO/scripts/generic_create_variant.py
+  buildroot/share/PlatformIO/scripts/stm32_bootloader.py
+  buildroot/share/PlatformIO/scripts/mks_encrypt.py
 
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