minor edits after verifying refactored grbl on real hardware

main.c

@@ -38,6 +38,7 @@ int main(void)
   spindle_init(); // initialize spindle controller
   gc_init(); // initialize gcode-parser
   sp_init(); // initialize the serial protocol
+//  sd_raw_init());
   
   DDRD |= (1<<3)|(1<<4)|(1<<5);