环境:
    开发版: M483KG
    usb转uart:   PL 2303/ FT 232

目的:       如何使用HSUSBH_USBH_VCOM 读写PL 2303/ FT 232?

问题:
    插拔PL2303/FR232装置，会显示Connect device， disconnect device
    但是不知道如何传收资料。

    讯息如下:
+---------------------------------------------------------+
|           M480 USB Host VCOM sample program             |
+---------------------------------------------------------+
|  (NOTE: This sample supports only one CDC device, but   |
|         driver supports multiple CDC devices. If you    |
|         want to support multiple CDC devices, you       |
|         have to modify this sample.                     |
+---------------------------------------------------------+
USB static memory: 6/256, heap used: 0
Connect device =>
New full-speed device address 2 assigned.
USB static memory: 7/256, heap used: 568
disconnect device...
USB static memory: 6/256, heap used: 0
USB static memory: 6/256, heap used: 0
Connect device =>
New full-speed device address 3 assigned.
USB static memory: 7/256, heap used: 568
disconnect device...
USB static memory: 6/256, heap used: 0
USB static memory: 6/256, heap used: 0
Connect device =>
New full-speed device address 4 assigned.
USB static memory: 7/256, heap used: 568