added comments

interfaces/spich.hpp

@@ -4,6 +4,8 @@
 #include "pin.hpp"
 #include "spi.hpp"
 
+// spi channel has a hardware spi object and a pin object for the chipselect. 
+
 template <typename DerivedPin,
           typename DerivedSPI>
 struct SPICH
@@ -19,11 +21,14 @@ struct SPICH
     uint8_t read_write_u8(const uint8_t& data)
     {
         uint8_t temp;
+
+        // spiHwCH.takeMutex();
         chipSelect.write(false);
         
         temp = spiHwCH.trx_u8(data);
 
         chipSelect.write(true);
+        // spiHwCH.releaseMutex();
         return temp;
     }
 
@@ -57,7 +62,7 @@ struct SPICH
 
         chipSelect.write(true);
     }
-    
+
     private:
 
     // hardware resources