<p><b>@bergzand</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10916#discussion_r256531383">sys/usb/usbus/usbus.c</a>:</p>
<pre style='color:#555'>> +                }
+                else if (usbus->setup_state == USBUS_SETUPRQ_OUTDATA && ep->dir == USB_EP_DIR_OUT) {
+                    /* Ready in ZLP */
+                    usbus->setup_state = USBUS_SETUPRQ_INACK;
+                    usbus->in->driver->ready(usbus->in, 0);
+                }
+                else if (ep->dir == USB_EP_DIR_OUT) {
+                    memset(&usbus->builder, 0, sizeof(usbus_controlbuilder_t));
+                    memcpy(&usbus->setup, usbus->out->buf, sizeof(usb_setup_t));
+                    usbus->builder.reqlen = usbus->setup.length;
+                    usbus->out->driver->ready(usbus->out, 0);
+                    recv_setup(usbus, ep);
+                }
+                break;
+            case USBDEV_EVENT_TR_FAIL:
+                if (ep->dir == USB_EP_DIR_OUT) {
</pre>
<p>Done</p>

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