From f73e4c3fc4cf7c166c6673329ffbfaf0f340c196 Mon Sep 17 00:00:00 2001
From: ZYH <lymz@foxmail.com>
Date: Tue, 9 Oct 2018 11:41:38 +0800
Subject: [PATCH] =?UTF-8?q?[Compoments][USB]=E5=A2=9E=E5=8A=A0=E5=AF=B9cla?=
 =?UTF-8?q?ss=E7=9A=84=E9=9D=9E=E6=B3=95=E6=B3=A8=E5=86=8C=E7=9A=84?=
 =?UTF-8?q?=E5=88=A4=E6=96=AD?=
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---
 components/drivers/usb/usbdevice/core/usbdevice.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/components/drivers/usb/usbdevice/core/usbdevice.c b/components/drivers/usb/usbdevice/core/usbdevice.c
index 574c9118d3..a55d745402 100644
--- a/components/drivers/usb/usbdevice/core/usbdevice.c
+++ b/components/drivers/usb/usbdevice/core/usbdevice.c
@@ -96,6 +96,13 @@ INIT_BOARD_EXPORT(rt_usbd_class_list_init);
 
 rt_err_t rt_usbd_class_register(udclass_t udclass)
 {
+#ifndef RT_USB_DEVICE_COMPOSITE
+    if(!rt_list_isempty(&class_list))
+    {
+        rt_kprintf("[D/USBD] If you want to use usb composite device please define RT_USB_DEVICE_COMPOSITE\n");
+        return RT_ERROR;
+    }
+#endif
     rt_list_insert_before(&class_list,&udclass->list);
     return RT_EOK;
 }
@@ -109,6 +116,11 @@ rt_err_t rt_usb_device_init(void)
     rt_list_t *i;
     udclass_t udclass;
 
+    if(rt_list_isempty(&class_list))
+    {
+        rt_kprintf("[D/USBD] No class register on usb device\n");
+        return RT_ERROR;
+    }
     /* create and startup usb device thread */
     rt_usbd_core_init();