建立工程，成功创建两个虚拟串口

source/rt_thread/libcpu/arm/common/div0.c

@@ -0,0 +1,12 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ */
+void __div0 (void)
+{
+    while (1) ;
+}