added basic outline of spi structure

interfaces/spi.hpp

@@ -0,0 +1,16 @@
+#ifndef _SPI_HPP_
+#define _SPI_HPP_
+
+#include <stdint.h>
+
+template <typename Derived>
+struct SPI
+{
+    uint8_t trx_u8(const uint8_t& data);
+    
+    void tx(const uint8_t& data);
+    
+    uint8_t rx();
+};
+
+#endif // _SPI_HPP_

interfaces/spich.hpp

@@ -0,0 +1,68 @@
+#ifndef _SPICH_HPP_
+#define _SPICH_HPP_
+
+#include "pin.hpp"
+#include "spi.hpp"
+
+template <typename DerivedPin,
+          typename DerivedSPI>
+struct SPICH
+{
+    SPICH(Pin<DerivedPin>& csPin,
+            SPI<DerivedSPI>& spi) :
+        chipSelect(csPin),
+        spiHwCH(spi) 
+    {
+
+    }
+
+    uint8_t read_write_u8(const uint8_t& data)
+    {
+        uint8_t temp;
+        chipSelect.write(false);
+        
+        temp = spiHwCH.trx_u8(data);
+
+        chipSelect.write(true);
+        return temp;
+    }
+
+    void readArray(const uint8_t& address,
+                   uint8_t[] buffer,
+                   const uint8_t& len)
+    {
+        chipSelect.write(false);
+
+        spiHwCH.tx(address);
+
+        for(uint8_t i = 0; i < len;i++) {
+            buffer[i] = spiHwCH.rx();
+        };
+
+        chipSelect.write(true);
+    }
+
+
+    void writeArray(const uint8_t& address,
+                    const uint8_t[] buffer,
+                    const uint8_t& len)
+    {
+        chipSelect.write(false);
+
+        spiHwCH.tx(address);
+
+        for(uint8_t i = 0; i < len;i++) {
+            spiHwCH.tx(buffer[i]);
+        };
+
+        chipSelect.write(true);
+    }
+    
+    private:
+
+    // hardware resources
+    Pin<DerivedPin> chipSelect;
+    SPI<DerivedSPI> spiHwCH;
+};
+
+#endif // _SPICH_HPP_