should fix #184

only response up to EP0 size with get device descriptor if not
addressed.

src/device/usbd.c

@@ -44,6 +44,7 @@ typedef struct {
   struct TU_ATTR_PACKED
   {
     volatile uint8_t connected    : 1;
+    volatile uint8_t addressed    : 1;
     volatile uint8_t configured   : 1;
     volatile uint8_t suspended    : 1;
 
@@ -478,6 +479,7 @@ static bool process_control_request(uint8_t rhport, tusb_control_request_t const
           // Depending on mcu, status phase could be sent either before or after changing device address
           // Therefore DCD must include zero-length status response
           dcd_set_address(rhport, (uint8_t) p_request->wValue);
+          _usbd_dev.addressed = 1;
           return true; // skip status
         break;
 
@@ -752,7 +754,17 @@ static bool process_get_descriptor(uint8_t rhport, tusb_control_request_t const
   switch(desc_type)
   {
     case TUSB_DESC_DEVICE:
-      return tud_control_xfer(rhport, p_request, (void*) tud_descriptor_device_cb(), sizeof(tusb_desc_device_t));
+    {
+      uint16_t len = sizeof(tusb_desc_device_t);
+
+      // Only send up to EP0 Packet Size if not addressed
+      if ((CFG_TUD_ENDPOINT0_SIZE < sizeof(tusb_desc_device_t)) && !_usbd_dev.addressed)
+      {
+        len = CFG_TUD_ENDPOINT0_SIZE;
+      }
+
+      return tud_control_xfer(rhport, p_request, (void*) tud_descriptor_device_cb(), len);
+    }
     break;
 
     case TUSB_DESC_BOS:
@@ -820,6 +832,7 @@ void dcd_event_handler(dcd_event_t const * event, bool in_isr)
 
     case DCD_EVENT_UNPLUGGED:
       _usbd_dev.connected = 0;
+      _usbd_dev.addressed = 0;
       _usbd_dev.configured = 0;
       _usbd_dev.suspended = 0;
       osal_queue_send(_usbd_q, event, in_isr);