add same7x to board list

docs/reference/supported.rst

@@ -175,6 +175,12 @@ SAMD51 & SAME54
 -  `D5035-01 <https://github.com/RudolphRiedel/USB_CAN-FD>`__
 -  `Microchip SAME54 Xplained Pro <https://www.microchip.com/developmenttools/productdetails/atsame54-xpro>`__
 
+SAME7x
+^^^^^^
+
+- `Microchip SAME70 Xplained <https://www.microchip.com/en-us/development-tool/ATSAME70-XPLD>`_
+- `QMTECH ATSAME70N19 <https://www.aliexpress.com/item/1005003173783268.html>`_
+
 SAMG
 ^^^^
 

src/class/vendor/vendor_device.c

@@ -207,6 +207,8 @@ uint16_t vendord_open(uint8_t rhport, tusb_desc_interface_t const * desc_itf, ui
     // Open endpoint pair with usbd helper
     TU_ASSERT(usbd_open_edpt_pair(rhport, p_desc, desc_itf->bNumEndpoints, TUSB_XFER_BULK, &p_vendor->ep_out, &p_vendor->ep_in), 0);
 
+    drv_len += desc_itf->bNumEndpoints*sizeof(tusb_desc_endpoint_t);
+
     // Prepare for incoming data
     if ( p_vendor->ep_out )
     {