已经完成了网络，DI口，RS485的数据透传，可通过RS485接收数据

User/ioLibrary_Driver/Internet/TFTP/netutil.h

@@ -0,0 +1,27 @@
+
+#ifndef __NETUTIL_H__
+#define __NETUTIL_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+
+#define SYSTEM_LITTLE_ENDIAN
+
+int8_t* inet_ntoa(uint32_t addr);
+int8_t* inet_ntoa_pad(uint32_t addr);
+uint32_t inet_addr(uint8_t* addr);
+uint16_t swaps(uint16_t i);
+uint32_t swapl(uint32_t l);
+uint16_t htons(uint16_t hostshort);
+uint32_t htonl(uint32_t hostlong);
+uint32_t ntohs(uint16_t netshort);
+uint32_t ntohl(uint32_t netlong);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif