MMCSPI_POLL_LEN
uint8_t pollbuf[MMCSPI_POLL_LEN];
err = mmcspi_do_spi_read(dev, pollbuf, MMCSPI_POLL_LEN);
for (i = 0; i < MMCSPI_POLL_LEN; i++) {
} while (MMCSPI_POLL_LEN == i);
non_token_bytes = MMCSPI_POLL_LEN - i - 1;
uint8_t txbuf[max(MMCSPI_POLL_LEN, 2)];
uint8_t pollbuf[MMCSPI_POLL_LEN];
err = mmcspi_do_spi_read(dev, pollbuf, MMCSPI_POLL_LEN);
for (i = 0; i < MMCSPI_POLL_LEN; i++) {
} while (MMCSPI_POLL_LEN == i);