USB复合设备的实现
USB复合设备一般用Interface Association Descriptor（IAD）实现，就是在要合并的接口前加上IAD描述符。
IAD描述符：
typedef struct _USBInterfaceAssociationDescriptor {
BYTE bLength: 0x08 //描述符大小
BYTE bDescriptorType: 0x0B //IAD描述符类型
BYTE bFirstInterface: 0x00 //起始接口
BYTE bInterfaceCount: 0x02 //接口数
BYTE bFunctionClass: 0x0E //类型代码
BYTE bFunctionSubClass: 0x03 //子类型代码
BYTE bFunctionProtocol: 0x00 //协议代码
BYTE iFunction: 0x04 //描述字符串索引
}
参考资料 http://www.microsoft.com/whdc/archive/IAD.mspx
这里有我发布的stm32虚拟双串口的例子http://www.ourdev.cn/bbs/bbs_content.jsp?bbs_sn=4028048 下载
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