LU_FUNCTION_R2
gpx_viper_write(ss, LU_FUNCTION_R2, FULL_SRC_RESOLUTION | LF_ZEROS);
write_ID(adder, LU_FUNCTION_R2, (FULL_SRC_RESOLUTION | LF_SOURCE));
write_ID(adder, LU_FUNCTION_R2, FULL_SRC_RESOLUTION | LF_SOURCE |