建立工程，成功创建两个虚拟串口

source/OpenAMP/libmetal/lib/system/linux/sleep.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2018, Linaro Limited. and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * @file	linux/sleep.h
+ * @brief	linux sleep primitives for libmetal.
+ */
+
+#ifndef __METAL_SLEEP__H__
+#error "Include metal/sleep.h instead of metal/linux/sleep.h"
+#endif
+
+#ifndef __METAL_LINUX_SLEEP__H__
+#define __METAL_LINUX_SLEEP__H__
+
+#include <unistd.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline int __metal_sleep_usec(unsigned int usec)
+{
+	return usleep(usec);
+}
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __METAL_LINUX_SLEEP__H__ */