I'm trying to port GRBL 1.1 to the STM32F746 chip. Tell me the solution, thanks.

Revision:
0:9dcf85d9b2f3
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/usb/usb_desc.c.bak	Mon Sep 04 12:05:05 2017 +0000
@@ -0,0 +1,159 @@
+/******************** (C) COPYRIGHT 2011 STMicroelectronics ********************
+* File Name          : usb_desc.c
+* Author             : MCD Application Team
+* Version            : V3.3.0
+* Date               : 21-March-2011
+* Description        : Descriptors for Virtual Com Port Demo
+********************************************************************************
+* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
+* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
+* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
+* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
+* CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
+* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
+*******************************************************************************/
+
+/* Includes ------------------------------------------------------------------*/
+#include "usb_lib.h"
+#include "usb_desc.h"
+
+/* USB Standard Device Descriptor */
+const uint8_t Virtual_Com_Port_DeviceDescriptor[] =
+  {
+    0x12,   /* bLength */
+    USB_DEVICE_DESCRIPTOR_TYPE,     /* bDescriptorType */
+    0x00,
+    0x02,   /* bcdUSB = 2.00 */
+    0x02,   /* bDeviceClass: CDC */
+    0x00,   /* bDeviceSubClass */
+    0x00,   /* bDeviceProtocol */
+    0x40,   /* bMaxPacketSize0 */
+    0x83,
+    0x04,   /* idVendor = 0x0483 */
+    0x40,
+    0x57,   /* idProduct = 0x7540 */
+    0x00,
+    0x02,   /* bcdDevice = 2.00 */
+    1,              /* Index of string descriptor describing manufacturer */
+    2,              /* Index of string descriptor describing product */
+    3,              /* Index of string descriptor describing the device's serial number */
+    0x01    /* bNumConfigurations */
+  };
+
+const uint8_t Virtual_Com_Port_ConfigDescriptor[] =
+  {
+    /*Configuration Descriptor*/
+    0x09,   /* bLength: Configuration Descriptor size */
+    USB_CONFIGURATION_DESCRIPTOR_TYPE,      /* bDescriptorType: Configuration */
+    VIRTUAL_COM_PORT_SIZ_CONFIG_DESC,       /* wTotalLength:no of returned bytes */
+    0x00,
+    0x02,   /* bNumInterfaces: 2 interface */
+    0x01,   /* bConfigurationValue: Configuration value */
+    0x00,   /* iConfiguration: Index of string descriptor describing the configuration */
+    0xC0,   /* bmAttributes: self powered */
+    0x32,   /* MaxPower 0 mA */
+    /*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 Management 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 */
+  };
+
+/* USB String Descriptors */
+const uint8_t Virtual_Com_Port_StringLangID[VIRTUAL_COM_PORT_SIZ_STRING_LANGID] =
+  {
+    VIRTUAL_COM_PORT_SIZ_STRING_LANGID,
+    USB_STRING_DESCRIPTOR_TYPE,
+    0x09,
+    0x04 /* LangID = 0x0409: U.S. English */
+  };
+
+const uint8_t Virtual_Com_Port_StringVendor[VIRTUAL_COM_PORT_SIZ_STRING_VENDOR] =
+  {
+    VIRTUAL_COM_PORT_SIZ_STRING_VENDOR,     /* Size of Vendor string */
+    USB_STRING_DESCRIPTOR_TYPE,             /* bDescriptorType*/
+    /* Manufacturer: "tomeko.net" */
+    't', 0, 'o', 0, 'm', 0, 'e', 0, 'k', 0, 'o', 0, ' ', 0, 'n', 0,
+    'e', 0, 't', 0
+  };
+
+const uint8_t Virtual_Com_Port_StringProduct[VIRTUAL_COM_PORT_SIZ_STRING_PRODUCT] =
+  {
+    VIRTUAL_COM_PORT_SIZ_STRING_PRODUCT,          /* bLength */
+    USB_STRING_DESCRIPTOR_TYPE,        /* bDescriptorType */
+    /* Product name: "miniscope v2c" */
+    'm', 0, 'i', 0, 'n', 0, 'i', 0, 's', 0, 'c', 0, 'o', 0, 'p', 0,
+    'e', 0, ' ', 0, 'v', 0, '2', 0, 'c', 0
+  };
+
+uint8_t Virtual_Com_Port_StringSerial[VIRTUAL_COM_PORT_SIZ_STRING_SERIAL] =
+  {
+    VIRTUAL_COM_PORT_SIZ_STRING_SERIAL,           /* bLength */
+    USB_STRING_DESCRIPTOR_TYPE,                   /* bDescriptorType */
+    'S', 0, 'T', 0, 'M', 0, '3', 0, '2', 0, '1', 0, '0', 0
+  };
+
+/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/