设备驱动经过两次自动搜索和安装，廉价的STM32F1芯片实现了双路的USB转RS485通信硬件桥，驱动是微软自家的，
其中一路信号在大虾开发板上通信测试通过，大虾开发板带有CH341电路，这个芯片的驱动也是自动安装的。
作为一个符合微软标准的USB复合设备(USB composite device)，本人设计的这款USB智能通讯产品，能被xpsp3, win7, win10所支持。
建议使用比较新的系统，在linux系统下，测试只能支持一个。
USB串行设备的配置描述常量数组如下所示，该描述不涉及代码部分，需要了解USB通讯协议。虽说是落后的USB1.1，可以满足常规
工作的需求。国内的专用芯片只有USB1.1全速的，USB2.0高速或USB3.0国内没有芯片可用，意法半导体的STM32F1或STM32L1可
替代国内专用芯片的大部分功能，关键是还能实现智能通讯，专用芯片不能编程，功能太单一。
const uint8_t Virtual_Com_Port_ConfigDescriptor[] =
{
/*Configuation Descriptor*/
0x09, /* bLength: Configuation Descriptor size */
USB_CONFIGURATION_DESCRIPTOR_TYPE, /* bDescriptorType: Configuration */
VIRTUAL_COM_PORT_SIZ_CONFIG_DESC, /* wTotalLength:no of returned bytes */
0x00,
0x04, /* bNumInterfaces: 4 interface */
0x01, /* bConfigurationValue: Configuration value */
0x00, /* iConfiguration: Index of string descriptor describing the configuration */
0xC0, /* bmAttributes: self powered */
0x32, /* MaxPower 100 mA */
/*IAD Configuation Descriptor*/
0x08, /* bLength: Interface Descriptor size */
0x0B, /* bDescriptorType: IAD */
0x00, /* bFirstInterface */
0x02, /* bInterfaceCount */
0x02, /* bFunctionClass: CDC */
0x02, /* bFunctionSubClass */
0x01, /* bFunctionProtocol */
0x02, /* iFunction */
/*Interface Descriptor*/
0x09, /* bLength: Interface Descriptor size */
USB_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType: Interface */
/* Interface descriptor type */
0x00, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x01, /* bNumEndpoints: One endpoints used */
0x02, /* bInterfaceClass: Communication Interface Class */
0x02, /* bInterfaceSubClass: Abstract Control Model */
0x01, /* bInterfaceProtocol: Common AT commands */
0x00, /* iInterface: */
/*Header Functional Descriptor*/
0x05, /* bLength: Endpoint Descriptor size */
0x24, /* bDescriptorType: CS_INTERFACE */
0x00, /* bDescriptorSubtype: Header Func Desc */
0x10, /* bcdCDC: spec release number */
0x01,
/*Call Managment Functional Descriptor*/
0x05, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x01, /* bDescriptorSubtype: Call Management Func Desc */
0x00, /* bmCapabilities: D0+D1 */
0x01, /* bDataInterface: 1 */
/*ACM Functional Descriptor*/
0x04, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x02, /* bDescriptorSubtype: Abstract Control Management desc */
0x02, /* bmCapabilities */
/*Union Functional Descriptor*/
0x05, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x06, /* bDescriptorSubtype: Union func desc */
0x00, /* bMasterInterface: Communication class interface */
0x01, /* bSlaveInterface0: Data Class Interface */
/*Endpoint 2 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType: Endpoint */
0x82, /* bEndpointAddress: (IN2) */
0x03, /* bmAttributes: Interrupt */
VIRTUAL_COM_PORT_INT_SIZE, /* wMaxPacketSize: */
0x00,
0xFF, /* bInterval: */
/*Data class interface descriptor*/
0x09, /* bLength: Endpoint Descriptor size */
USB_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType: */
0x01, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x02, /* bNumEndpoints: Two endpoints used */
0x0A, /* bInterfaceClass: CDC */
0x00, /* bInterfaceSubClass: */
0x00, /* bInterfaceProtocol: */
0x00, /* iInterface: */
/*Endpoint 3 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType: Endpoint */
0x03, /* bEndpointAddress: (OUT3) */
0x02, /* bmAttributes: Bulk */
VIRTUAL_COM_PORT_DATA_SIZE, /* wMaxPacketSize: */
0x00,
0x00, /* bInterval: ignore for Bulk transfer */
/*Endpoint 1 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType: Endpoint */
0x81, /* bEndpointAddress: (IN1) */
0x02, /* bmAttributes: Bulk */
VIRTUAL_COM_PORT_DATA_SIZE, /* wMaxPacketSize: */
0x00,
0x00, /* bInterval */
/*IAD Configuation Descriptor*/
0x08, /* bLength: Interface Descriptor size */
0x0B, /* bDescriptorType: IAD */
0x02, /* bFirstInterface */
0x02, /* bInterfaceCount */
0x02, /* bFunctionClass: CDC */
0x02, /* bFunctionSubClass */
0x01, /* bFunctionProtocol */
0x02, /* iFunction */
/*Interface Descriptor*/
0x09, /* bLength: Interface Descriptor size */
USB_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType: Interface */
/* Interface descriptor type */
0x02, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x01, /* bNumEndpoints: One endpoints used */
0x02, /* bInterfaceClass: Communication Interface Class */
0x02, /* bInterfaceSubClass: Abstract Control Model */
0x01, /* bInterfaceProtocol: Common AT commands */
0x00, /* iInterface: */
/*Header Functional Descriptor*/
0x05, /* bLength: Endpoint Descriptor size */
0x24, /* bDescriptorType: CS_INTERFACE */
0x00, /* bDescriptorSubtype: Header Func Desc */
0x10, /* bcdCDC: spec release number */
0x01,
/*Call Managment Functional Descriptor*/
0x05, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x01, /* bDescriptorSubtype: Call Management Func Desc */
0x00, /* bmCapabilities: D0+D1 */
0x03, /* !! bDataInterface: */
/*ACM Functional Descriptor*/
0x04, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x02, /* bDescriptorSubtype: Abstract Control Management desc */
0x02, /* bmCapabilities */
/*Union Functional Descriptor*/
0x05, /* bFunctionLength */
0x24, /* bDescriptorType: CS_INTERFACE */
0x06, /* bDescriptorSubtype: Union func desc */
0x02, /* !! bMasterInterface: Communication class interface */
0x03, /* !! bSlaveInterface0: Data Class Interface */
/*Endpoint 2 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType: Endpoint */
0x85, /* bEndpointAddress: (IN2) */
0x03, /* bmAttributes: Interrupt */
VIRTUAL_COM_PORT_INT_SIZE, /* wMaxPacketSize: */
0x00,
0xFF, /* bInterval: */
/*Data class interface descriptor*/
0x09, /* bLength: Endpoint Descriptor size */
USB_INTERFACE_DESCRIPTOR_TYPE, /* bDescriptorType: */
0x03, /* bInterfaceNumber: Number of Interface */
0x00, /* bAlternateSetting: Alternate setting */
0x02, /* bNumEndpoints: Two endpoints used */
0x0A, /* bInterfaceClass: CDC */
0x00, /* bInterfaceSubClass: */
0x00, /* bInterfaceProtocol: */
0x00, /* iInterface: */
/*Endpoint 3 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType: Endpoint */
0x06, /* bEndpointAddress: (OUT3) */
0x02, /* bmAttributes: Bulk */
VIRTUAL_COM_PORT_DATA_SIZE, /* wMaxPacketSize: */
0x00,
0x00, /* bInterval: ignore for Bulk transfer */
/*Endpoint 1 Descriptor*/
0x07, /* bLength: Endpoint Descriptor size */
USB_ENDPOINT_DESCRIPTOR_TYPE, /* bDescriptorType: Endpoint */
0x84, /* bEndpointAddress: (IN1) */
0x02, /* bmAttributes: Bulk */
VIRTUAL_COM_PORT_DATA_SIZE, /* wMaxPacketSize: */
0x00,
0x00 /* bInterval */
};
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