mmc_spi_readbytes
mmc_spi_readbytes(host, 18);
status = mmc_spi_readbytes(host, n);
value = mmc_spi_readbytes(host, 1);
value = mmc_spi_readbytes(host, 1);
value = mmc_spi_readbytes(host, 1);
value = mmc_spi_readbytes(host, 1);
status = mmc_spi_readbytes(host, 1);
mmc_spi_readbytes(host, 10);