SD_ARG_CMD52_WRITE
ISSET(arg, SD_ARG_CMD52_WRITE) ? "write" : "read");
SD_ARG_CMD52_WRITE, false);
SD_ARG_CMD52_WRITE|SD_ARG_CMD52_EXCHANGE, false);
SD_ARG_CMD52_WRITE, true);
SD_ARG_CMD52_WRITE, true) == 0)