/*!
 * @file        readme.txt
 *
 * @brief       This file is routine instruction
 *
 * @version     V1.0.0
 *
 * @date        2022-05-25
 *
 * @attention
 *
 *  Copyright (C) 2021-2022 Geehy Semiconductor
 *
 *  You may not use this file except in compliance with the
 *  GEEHY COPYRIGHT NOTICE (GEEHY SOFTWARE PACKAGE LICENSE).
 *
 *  The program is only for reference, which is distributed in the hope
 *  that it will be usefull and instructional for customers to develop
 *  their software. Unless required by applicable law or agreed to in
 *  writing, the program is distributed on an "AS IS" BASIS, WITHOUT
 *  ANY WARRANTY OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the GEEHY SOFTWARE PACKAGE LICENSE for the governing permissions
 *  and limitations under the License.
 */


&par Example Description

This example describes how to use the usb host to enum a CDC class device.
When press key1(PA1), host will keep receiving data from device when USART1
show "Enable CDC Get data.", press key1 again will toggle the state and host
will not receive data from device.
When press key2(PA0), host will send data to device.


The USART1 is configured as follows:
    - TX:PA9, RX:PA10
    - BaudRate = 115200 baud
    - Word Length = 8 Bits
    - One Stop Bit
    - No parity
    - Hardware flow control disabled (RTS and CTS signals)
    - Receive and transmit enabled

&par Directory contents

  - USB\Host\USBH_CDC\Source\apm32f4xx_int.c              Interrupt handlers
  - USB\Host\USBH_CDC\Source\main.c                       Main program
  - USB\Host\USBH_CDC\Source\usb_user.c                   provides functions for usb user configuration
  - USB\Host\USBH_CDC\Source\usb_board.c                  board configuration

&par IDE environment

  - MDK-ARM V5.29
  - EWARM V8.50.4.26131

&par Hardware and Software environment

  - This example runs on APM32F407_EVAL Devices.
