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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/10916#discussion_r269905341">sys/usb/usbus/usbus_fmt.c</a>:</p>
<pre style='color:#555'>> +size_t usbus_fmt_hdr_conf(usbus_t *usbus)
+{
+    size_t len = 0;
+    usb_descriptor_configuration_t conf;
+
+    memset(&conf, 0, sizeof(usb_descriptor_configuration_t));
+    conf.length = sizeof(usb_descriptor_configuration_t);
+    conf.type = USB_TYPE_DESCRIPTOR_CONFIGURATION;
+    conf.total_length = sizeof(usb_descriptor_configuration_t);
+    conf.val = 1;
+    conf.attributes = USB_CONF_ATTR_RESERVED;
+    if (USB_CONFIG_SELF_POWERED) {
+        conf.attributes |= USB_CONF_ATTR_SELF_POWERED;
+    }
+    /* Todo: upper bound */
+    conf.max_power = USB_CONFIG_MAX_POWER / 2;
</pre>
<p>I would be very happy !</p>

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