建立工程，成功创建两个虚拟串口

source/OpenAMP/libmetal/lib/include/metal/sleep.h

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+/*
+ * Copyright (c) 2016, Xilinx Inc. and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * @file	sleep.h
+ * @brief	Sleep primitives for libmetal.
+ */
+
+#ifndef __METAL_SLEEP__H__
+#define __METAL_SLEEP__H__
+
+#include <metal/system/generic/sleep.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** \defgroup sleep Sleep Interfaces
+ *  @{ */
+
+/**
+ * @brief      delay in microseconds
+ *             delay the next execution in the calling thread
+ *             fo usec microseconds.
+ *
+ * @param[in]  usec      microsecond intervals
+ * @return     0 on success, non-zero for failures
+ */
+static inline int metal_sleep_usec(unsigned int usec)
+{
+	return __metal_sleep_usec(usec);
+}
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __METAL_SLEEP__H__ */
+