Added flags for RP register

Author: Optix

hardware.inc

@@ -607,9 +607,15 @@ HDMA5F_BUSY EQU %10000000 ; 0=Busy (DMA still in progress), 1=Transfer complete
 ; --
 ; -- RP ($FF56)
 ; -- Infrared Communications Port (R/W)
+; -- CGB Mode Only
 ; --
 rRP EQU $FF56
 
+RPF_ENREAD   EQU %11000000
+RPF_DATAIN   EQU %00000010 ; 0=Receiving IR Signal, 1=Normal
+RPF_WRITE_HI EQU %00000001
+RPF_WRITE_LO EQU %00000000
+
 
 ; --
 ; -- BCPS ($FF68)