Moved simultaneous reading and writing into SPI; removed it from I2C and UART

include/sta/bus/device.hpp

@@ -53,15 +53,6 @@ namespace sta
          */
         void transfer(const uint8_t * buffer, size_t size);
 
-        /**
-         * @brief Send and receive data simultaneously.
-         *
-         * @param txBuffer  Send buffer
-         * @param rxBuffer  Receive buffer
-         * @param size      Number of bytes to transfer
-         */
-        void transfer(const uint8_t * txBuffer, uint8_t * rxBuffer, size_t size);
-
         /**
          * @brief Read incoming data to buffer.
          *
@@ -95,4 +86,4 @@ namespace sta
     };
 } // namespace sta
 
-#endif // STA_CORE_BUS_SERIAL_DEVICE_HPP
+#endif // STA_CORE_BUS_SERIAL_DEVICE_HPP