添加rtthread相关代码

riscv/rtthread/components/utilities/ulog/backend/console_be.c

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2006-2022, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-09-04     armink       the first version
+ */
+
+#include <rthw.h>
+#include <ulog.h>
+
+#ifdef ULOG_BACKEND_USING_CONSOLE
+
+#if defined(ULOG_ASYNC_OUTPUT_BY_THREAD) && ULOG_ASYNC_OUTPUT_THREAD_STACK < 384
+#error "The thread stack size must more than 384 when using async output by thread (ULOG_ASYNC_OUTPUT_BY_THREAD)"
+#endif
+
+static struct ulog_backend console = { 0 };
+
+void ulog_console_backend_output(struct ulog_backend *backend, rt_uint32_t level, const char *tag, rt_bool_t is_raw,
+        const char *log, rt_size_t len)
+{
+    rt_kputs(log);
+
+}
+
+int ulog_console_backend_init(void)
+{
+    ulog_init();
+    console.output = ulog_console_backend_output;
+
+    ulog_backend_register(&console, "console", RT_TRUE);
+
+    return 0;
+}
+INIT_PREV_EXPORT(ulog_console_backend_init);
+
+#endif /* ULOG_BACKEND_USING_CONSOLE */