HiTechnic IRSeeker2 constants

HTIR2_MODE_1200 HTIR2_MODE_600 HTIR2_REG_AC01 HTIR2_REG_AC02 HTIR2_REG_AC03 HTIR2_REG_AC04 HTIR2_REG_AC05 HTIR2_REG_ACDIR HTIR2_REG_DC01 HTIR2_REG_DC02 HTIR2_REG_DC03 HTIR2_REG_DC04 HTIR2_REG_DC05 HTIR2_REG_DCAVG HTIR2_REG_DCDIR HTIR2_REG_MODE

#define HTIR2_REG_DCDIR   0x42 IRSeeker2 DC direction register