已经完成了网络，DI口，RS485的数据透传，可通过RS485接收数据

User/Loopback/loopback.h

@@ -0,0 +1,41 @@
+#ifndef _LOOPBACK_H_
+#define _LOOPBACK_H_
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+#include <stdint.h>
+
+
+/* Loopback test debug message printout enable */
+#define _LOOPBACK_DEBUG_
+
+/* DATA_BUF_SIZE define for Loopback example */
+#ifndef DATA_BUF_SIZE
+#define DATA_BUF_SIZE 2048
+#endif
+
+/************************/
+/* Select LOOPBACK_MODE */
+/************************/
+#define LOOPBACK_MAIN_NOBLOCK 0
+#define LOOPBACK_MODE LOOPBACK_MAIN_NOBLOCK
+
+	/* TCP server Loopback test example */
+	int32_t loopback_tcps(uint8_t sn, uint8_t *buf, uint16_t port);
+
+	/* TCP client Loopback test example */
+	int32_t loopback_tcpc(uint8_t sn, uint8_t *buf, uint8_t *destip, uint16_t destport);
+
+	/* UDP Loopback test example */
+	int32_t loopback_udps(uint8_t sn, uint8_t *buf, uint16_t port);
+
+	/* UDP Client Loopback test example */
+	int32_t loopback_udpc(uint8_t sn, uint8_t *buf, uint8_t *destip, uint16_t destport);
+#ifdef __cplusplus
+}
+#endif
+
+#endif