diff --git a/Ethernet/socket.c b/Ethernet/socket.c
index 4f6ee50..44e0ff1 100644
--- a/Ethernet/socket.c
+++ b/Ethernet/socket.c
@@ -59,6 +59,11 @@
 //#define SOCK_ANY_PORT_NUM  0xC000;
 #define SOCK_ANY_PORT_NUM  0xC000
 
+// Static prototypes
+static int8_t connect_IO_6(uint8_t sn, uint8_t * addr, uint16_t port, uint8_t addrlen);
+static int32_t sendto_IO_6(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t port, uint8_t addrlen);
+static int32_t recvfrom_IO_6(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t *port, uint8_t *addrlen);
+
 static uint16_t sock_any_port = SOCK_ANY_PORT_NUM;
 static uint16_t sock_io_mode = 0;
 static uint16_t sock_is_sending = 0;
@@ -196,8 +201,8 @@ inline uint8_t inline_CheckAddrlen_W6x00(void) {
 
 int8_t socket(uint8_t sn, uint8_t protocol, uint16_t port, uint8_t flag) {
 
-    uint8_t taddr[16];
-    uint16_t local_port = 0;
+    //uint8_t taddr[16];
+    //uint16_t local_port = 0;
     CHECK_SOCKNUM();
     switch (protocol & 0x0F) {
 #ifdef IPV6_AVAILABLE
@@ -1033,6 +1038,7 @@ static int32_t recvfrom_IO_6(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t *
         while (getSn_CR(sn));
 
 #else
+        (void)addrlen; // Unused
         if (sock_remained_size[sn] == 0) {
             wiz_recv_data(sn, head, 8);
             setSn_CR(sn, Sn_CR_RECV);
diff --git a/Ethernet/socket.h b/Ethernet/socket.h
index 292844c..42a856b 100644
--- a/Ethernet/socket.h
+++ b/Ethernet/socket.h
@@ -311,7 +311,7 @@ int8_t  listen(uint8_t sn);
          In block io mode, it does not return until connection is completed. \n
          In Non-block io mode(@ref SF_IO_NONBLOCK), it returns @ref SOCK_BUSY immediately.
 */
-static int8_t connect_IO_6(uint8_t sn, uint8_t * addr, uint16_t port, uint8_t addrlen);
+//static int8_t connect_IO_6(uint8_t sn, uint8_t * addr, uint16_t port, uint8_t addrlen);
 //int8_t connect(uint8_t sn, uint8_t * addr, uint16_t port, uint8_t addrlen);
 
 /**
@@ -401,7 +401,7 @@ int32_t recv(uint8_t sn, uint8_t * buf, uint16_t len);
          In non-block io mode(@ref SF_IO_NONBLOCK), It return @ref SOCK_BUSY immediately when SOCKET transimttable buffer size is not enough.
 */
 //int32_t sendto(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t port, uint8_t addrlen);
-static int32_t sendto_IO_6(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t port, uint8_t addrlen);
+//static int32_t sendto_IO_6(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t port, uint8_t addrlen);
 
 /**
     @ingroup WIZnet_socket_APIs
@@ -436,7 +436,7 @@ static int32_t sendto_IO_6(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * ad
          In non-block io mode(@ref SF_IO_NONBLOCK), it return @ref SOCK_BUSY immediately when SOCKET RX buffer is empty. \n
 */
 //int32_t recvfrom(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t *port, uint8_t *addrlen);
-static int32_t recvfrom_IO_6(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t *port, uint8_t *addrlen);
+//static int32_t recvfrom_IO_6(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t *port, uint8_t *addrlen);
 
 
 /////////////////////////////
diff --git a/Ethernet/wizchip_conf.c b/Ethernet/wizchip_conf.c
index 9409b60..a364688 100644
--- a/Ethernet/wizchip_conf.c
+++ b/Ethernet/wizchip_conf.c
@@ -58,6 +58,24 @@
 //M20150401 : Remove ; in the default callback function such as wizchip_cris_enter(), wizchip_cs_select() and etc.
 /////////////
 
+// Prototypes to avoid compiler warnings:
+void wizchip_cris_enter(void);
+void wizchip_cris_exit(void);
+void wizchip_cs_select(void);
+void wizchip_cs_deselect(void);
+iodata_t wizchip_bus_readdata(uint32_t AddrSel);
+void wizchip_bus_writedata(uint32_t AddrSel, iodata_t wb);
+void wizchip_bus_read_buf(uint32_t AddrSel, iodata_t* buf, int16_t len, uint8_t addrinc);
+void wizchip_bus_write_buf(uint32_t AddrSel, iodata_t* buf, int16_t len, uint8_t addrinc);
+iodata_t wizchip_bus_readbyte(void);
+uint8_t wizchip_spi_readbyte(void);
+void wizchip_spi_writebyte(uint8_t wb);
+void wizchip_spi_readburst(uint8_t* pBuf, uint16_t len);
+void wizchip_spi_writeburst(uint8_t* pBuf, uint16_t len);
+void wizchip_qspi_read(uint8_t opcode, uint16_t addr, uint8_t* pBuf, uint16_t len);
+void wizchip_qspi_write(uint8_t opcode, uint16_t addr, uint8_t* pBuf, uint16_t len);
+void reg_wizchip_busbuf_cbfunc(void(*busbuf_rb)(uint32_t AddrSel, iodata_t* pBuf, int16_t len, uint8_t addrinc), void (*busbuf_wb)(uint32_t AddrSel, iodata_t* pBuf, int16_t len, uint8_t addrinc));
+
 /**
     @brief Default function to enable interrupt.
     @note This function help not to access wrong address. If you do not describe this function or register any functions,
@@ -127,7 +145,7 @@ void 	wizchip_bus_writedata(uint32_t AddrSel, iodata_t wb)  {
     @sa wizchip_bus_write_buf()
 */
 void wizchip_bus_read_buf(uint32_t AddrSel, iodata_t* buf, int16_t len, uint8_t addrinc) {
-    uint16_t i;
+    int16_t i;
     if (addrinc) {
         addrinc = sizeof(iodata_t);
     }
@@ -151,7 +169,7 @@ void wizchip_bus_read_buf(uint32_t AddrSel, iodata_t* buf, int16_t len, uint8_t
     @sa wizchip_bus_read_buf()
 */
 void wizchip_bus_write_buf(uint32_t AddrSel, iodata_t* buf, int16_t len, uint8_t addrinc) {
-    uint16_t i;
+    int16_t i;
     if (addrinc) {
         addrinc = sizeof(iodata_t);
     }
@@ -179,7 +197,7 @@ uint8_t wizchip_spi_readbyte(void)        {
     null function is called.
 */
 //void 	wizchip_spi_writebyte(uint8_t wb) {};
-void 	wizchip_spi_writebyte(uint8_t wb) {}
+void 	wizchip_spi_writebyte(uint8_t wb) { (void)wb; }
 
 /**
     @brief Default function to burst read in SPI interface.
@@ -221,14 +239,14 @@ void 	wizchip_spi_writeburst(uint8_t* pBuf, uint16_t len) {}
     @note This function help not to access wrong address. If you do not describe this function or register any functions,
     null function is called.
 */
-void wizchip_qspi_read(uint8_t opcode, uint16_t addr, uint8_t* pBuf, uint16_t len) {}
+void wizchip_qspi_read(uint8_t opcode, uint16_t addr, uint8_t* pBuf, uint16_t len) { (void)opcode; (void)addr; (void)pBuf; (void)len; }
 
 /**
     @brief Default function to write in QSPI interface.
     @note This function help not to access wrong address. If you do not describe this function or register any functions,
     null function is called.
 */
-void wizchip_qspi_write(uint8_t opcode, uint16_t addr, uint8_t* pBuf, uint16_t len) {}
+void wizchip_qspi_write(uint8_t opcode, uint16_t addr, uint8_t* pBuf, uint16_t len) { (void)opcode; (void)addr; (void)pBuf; (void)len; }
 
 #endif
 /**
@@ -270,7 +288,9 @@ _WIZCHIP  WIZCHIP = {
             //wizchip_bus_readbyte,
             //wizchip_bus_writebyte
             wizchip_bus_readdata,
-            wizchip_bus_writedata
+            wizchip_bus_writedata,
+            NULL,
+            NULL
         },
 
     }