first commit

include/w5500.h

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+#ifndef W5500_H
+#define W5500_H
+
+#include <stdint.h>
+
+// Sets the CS pin low
+void W5500_Select(void);
+
+// Sets the CS pin high
+void W5500_Unselect(void);
+
+// Reads a byte via SPI
+uint8_t W5500_ReadByte(void);
+
+// Writes a byte via SPI
+void W5500_WriteByte(uint8_t byte);
+
+// Reads multiple bytes via SPI
+void W5500_ReadBuff(uint8_t* buff, uint16_t len);
+
+// Writes multiple bytes via SPI
+void W5500_WriteBuff(uint8_t* buff, uint16_t len);
+
+#endif  // W5500_H