MarlinFirmware/buildroot/share/vscode/create_custom_upload_command_DFU.py

#
#  Builds custom upload command
#    1) Run platformio as a subprocess to find a COM port
#    2) Build the upload command
#    3) Exit and let upload tool do the work
#
#  This script runs between completion of the library/dependencies installation and compilation.
#
#  Will continue on if a COM port isn't found so that the compilation can be done.
#

import os
import sys
from SCons.Script import DefaultEnvironment
import platform
current_OS = platform.system()

env = DefaultEnvironment()

build_type = os.environ.get("BUILD_TYPE", 'Not Set')
if not(build_type == 'upload' or build_type == 'traceback' or build_type == 'Not Set') :
  env.Replace(UPLOAD_PROTOCOL = 'teensy-gui')  # run normal Teensy2 scripts
else:

  if current_OS == 'Windows':
      avrdude_conf_path =  env.get("PIOHOME_DIR") + '\\packages\\toolchain-atmelavr\\etc\\avrdude.conf'

      source_path = env.get("PROJECTBUILD_DIR") + '\\' + env.get("PIOENV") + '\\firmware.hex'

      upload_string = 'avrdude -p usb1286 -c flip1 -C ' + avrdude_conf_path + ' -U flash:w:' + source_path + ':i'

  else:
      source_path = env.get("PROJECTBUILD_DIR") + '/' + env.get("PIOENV") + '/firmware.hex'

      upload_string = 'avrdude -p usb1286 -c flip1 -U flash:w:' + source_path + ':i'


  env.Replace(
       UPLOADCMD = upload_string,
       MAXIMUM_RAM_SIZE = 8192,
       MAXIMUM_SIZE = 130048
  )