/**
  **************************************************************************
  * @file     readme.txt
  * @brief    readme
  **************************************************************************
  */

  this demo shows how to use the usb otg host peripheral with usb cdc devices.

  when an usb device is attached to the host port, the device is enumerated and
  checked whether it cdc device.

  this example supports cdc devices with protocol 0x00 or 0x01 to
  improve compatibility with composite devices such as e-Link32 Pro Debug Adapter.
