Added some symbols.

include/tm1650.h

@@ -22,10 +22,12 @@ typedef enum {
   Sym_D = 0x5e,
   Sym_E = 0x79,
   Sym_F = 0x71,
-  Sym_Minus = 0x40,
   Sym_Dot = 0x80,
+  Sym_Minus = 0x40,
   Sym_Plus = 0x46,
   Sym_H = 0x76,
+  Sym_r = 0x60,
+  Sym_o = 0x63,
   Sym_Off = 0x00
 } tm1650_sym_t;