建立工程，成功创建两个虚拟串口

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

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+/*
+ * Copyright (c) 2018, Linaro Limited. and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * @file	freertos/sleep.h
+ * @brief	FreeRTOS sleep primitives for libmetal.
+ */
+
+#ifndef __METAL_SLEEP__H__
+#error "Include metal/sleep.h instead of metal/freertos/sleep.h"
+#endif
+
+#ifndef __METAL_FREERTOS_SLEEP__H__
+#define __METAL_FREERTOS_SLEEP__H__
+
+#include <FreeRTOS.h>
+#include <task.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline int __metal_sleep_usec(unsigned int usec)
+{
+	const TickType_t xDelay = usec / portTICK_PERIOD_MS;
+	vTaskDelay(xDelay);
+	return 0;
+}
+
+/** @} */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __METAL_FREERTOS_SLEEP__H__ */