drivers/wiznet5k: Get low-level W5500 driver working.

This patch implements the basic SPI read/write functions for the W5500
chip.  It also allows _WIZCHIP_ to be configured externally to select the
specific Wiznet chip.

drivers/wiznet5k/ethernet/w5500/w5500.c

@@ -57,6 +57,16 @@
 
 ////////////////////////////////////////////////////
 
+#define LPC_SSP0 (0)
+
+static void Chip_SSP_ReadFrames_Blocking(int dummy, uint8_t *buf, uint32_t len) {
+    WIZCHIP.IF.SPI._read_bytes(buf, len);
+}
+
+static void Chip_SSP_WriteFrames_Blocking(int dummy, const uint8_t *buf, uint32_t len) {
+    WIZCHIP.IF.SPI._write_bytes(buf, len);
+}
+
 uint8_t  WIZCHIP_READ(uint32_t AddrSel)
 {
    uint8_t ret;

drivers/wiznet5k/ethernet/w5500/w5500.h

@@ -44,7 +44,6 @@
 
 #include <stdint.h>
 #include "../wizchip_conf.h"
-#include "board.h"
 
 #define _W5500_IO_BASE_              0x00000000
 

drivers/wiznet5k/ethernet/wizchip_conf.h

@@ -56,7 +56,9 @@
  * @todo You should select one, \b 5100, \b 5200 ,\b 5500 or etc. \n\n
  *       ex> <code> #define \_WIZCHIP_      5500 </code>
  */
+#ifndef _WIZCHIP_
 #define _WIZCHIP_                      5200   // 5100, 5200, 5500
+#endif
 
 #define _WIZCHIP_IO_MODE_NONE_         0x0000
 #define _WIZCHIP_IO_MODE_BUS_          0x0100 /**< Bus interface mode */