add interface descriptor template

src/class/cdc/cdc_device.h

@@ -104,6 +104,38 @@ bool cdcd_control_request_complete (uint8_t rhport, tusb_control_request_t const
 bool cdcd_xfer_cb            (uint8_t rhport, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes);
 void cdcd_reset              (uint8_t rhport);
 
+
+//--------------------------------------------------------------------+
+// Interface Descriptor Template
+//--------------------------------------------------------------------+
+
+// Length of template descriptor: 66 bytes
+#define TUD_CDC_DESC_LEN  (8+9+5+5+4+5+7+9+7+7)
+
+// CDC Descriptor Template
+// interface number, string index, EP notification address and size, EP data address (out,in) and size.
+#define TUD_CDC_DESCRIPTOR(_itfnum, _stridx, _ep_notif, _ep_notif_size, _epout, _epin, _epsize) \
+  /* Interface Associate */\
+  0x08, TUSB_DESC_INTERFACE_ASSOCIATION, _itfnum, 0x02, TUSB_CLASS_CDC, CDC_COMM_SUBCLASS_ABSTRACT_CONTROL_MODEL, CDC_COMM_PROTOCOL_ATCOMMAND, 0x00,\
+  /* CDC Control Interface */\
+  0x09, TUSB_DESC_INTERFACE, _itfnum, 0x00, 0x01, TUSB_CLASS_CDC, CDC_COMM_SUBCLASS_ABSTRACT_CONTROL_MODEL, CDC_COMM_PROTOCOL_ATCOMMAND, _stridx,\
+  /* CDC Header */\
+  0x05, TUSB_DESC_CLASS_SPECIFIC, CDC_FUNC_DESC_HEADER, U16_TO_U8S_LE(0x0120),\
+  /* CDC Call */\
+  0x05, TUSB_DESC_CLASS_SPECIFIC, CDC_FUNC_DESC_CALL_MANAGEMENT, 0x00, (_itfnum) + 1,\
+  /* CDC ACM: support line request */\
+  0x04, TUSB_DESC_CLASS_SPECIFIC, CDC_FUNC_DESC_ABSTRACT_CONTROL_MANAGEMENT, 0x02,\
+  /* CDC Union */\
+  0x05, TUSB_DESC_CLASS_SPECIFIC, CDC_FUNC_DESC_UNION, _itfnum, (_itfnum) + 1,\
+  /* Endpoint Notification */\
+  0x07, TUSB_DESC_ENDPOINT, _ep_notif, TUSB_XFER_INTERRUPT, U16_TO_U8S_LE(_ep_notif_size), 0x10,\
+  /* CDC Data Interface */\
+  0x09, TUSB_DESC_INTERFACE, (_itfnum)+1, 0x00, 0x02, TUSB_CLASS_CDC_DATA, 0x00, 0x00, 0x00,\
+  /* Endpoint Out */\
+  0x07, TUSB_DESC_ENDPOINT, _epout, TUSB_XFER_BULK, U16_TO_U8S_LE(_epsize), 0x00,\
+  /* Endpoint In */\
+  0x07, TUSB_DESC_ENDPOINT, _epin, TUSB_XFER_BULK, U16_TO_U8S_LE(_epsize), 0x00
+
 #ifdef __cplusplus
  }
 #endif

src/class/msc/msc_device.h

@@ -47,7 +47,7 @@ TU_VERIFY_STATIC(CFG_TUD_MSC_BUFSIZE < UINT16_MAX, "Size is not correct");
 #endif
 
 #ifndef CFG_TUD_MSC_BUFSIZE
-  #error CFG_TUD_MSC_BUFSIZE must be defined, value of CFG_TUD_MSC_BLOCK_SZ should work well, the more the better
+  #error CFG_TUD_MSC_BUFSIZE must be defined, value of a block size should work well, the more the better
 #endif
 
 #ifndef CFG_TUD_MSC_VENDOR
@@ -62,6 +62,24 @@ TU_VERIFY_STATIC(CFG_TUD_MSC_BUFSIZE < UINT16_MAX, "Size is not correct");
   #error CFG_TUD_MSC_PRODUCT_REV 4-byte string must be defined
 #endif
 
+
+//--------------------------------------------------------------------+
+// Interface Descriptor Template
+//--------------------------------------------------------------------+
+
+// Length of template descriptor: 23 bytes
+#define TUD_MSC_DESC_LEN    (9 + 7 + 7)
+
+// Interface Number, EP Out & EP In address
+#define TUD_MSC_DESCRIPTOR(_itfnum, _stridx, _epout, _epin, _epsize) \
+  /* Interface */\
+  0x09, TUSB_DESC_INTERFACE, _itfnum, 0x00, 0x02, TUSB_CLASS_MSC, MSC_SUBCLASS_SCSI, MSC_PROTOCOL_BOT, _stridx,\
+  /* Endpoint Out */\
+  0x07, TUSB_DESC_ENDPOINT, _epout, TUSB_XFER_BULK, U16_TO_U8S_LE(_epsize), 0x00,\
+  /* Endpoint In */\
+  0x07, TUSB_DESC_ENDPOINT, _epin, TUSB_XFER_BULK, U16_TO_U8S_LE(_epsize), 0x00
+
+
 /** \addtogroup ClassDriver_MSC
  *  @{
  * \defgroup MSC_Device Device