code: def main(jlink_serial, device):
      
      buf = StringIO.StringIO()
      jlink = pylink.JLink(log=buf.write, detailed_log=buf.write)
      jlink.open(serial_no=jlink_serial)
  
      jlink.set_tif(pylink.enums.JLinkInterfaces.SWD)
      jlink.connect(device, verbose=True)
  
      # Figure out our original endianess first.
      big_endian = jlink.set_little_endian()
      if big_endian:
          jlink.set_big_endian()
  
      print('Target Endian Mode: %s Endian' % ('Big' if big_endian else 'Little'))
docs: Main function.
  
      Args:
        jlink_serial (str): the J-Link serial number
        device (str): the target CPU
  
      Returns:
        ``None``
  
      Raises:
        JLinkException: on error