Improved printable implementation; data reading with macro

include/sta/debug/printing/printable_uart.hpp

@@ -37,12 +37,12 @@ namespace sta
         void print(const char * str, size_t length, bool newline = false) override;
 
         /**
-         * @brief Read string.
-         *
-         * @param str       String buffer
-         * @param length    String length
+         * @brief Read bytes.
+         * 
+         * @param buffer    Byte buffer
+         * @param length    Buffer length
          */
-        void read(char * str, size_t length) override;
+        void read(uint8_t * str, size_t length) override;
         
     private:
         UART * intf_;