AW_SPI_FIFO_SIZE
for (i = 0; i < (AW_SPI_FIFO_SIZE - txcnt); i++) {
((3 * AW_SPI_FIFO_SIZE / 4) << AW_SPI_FCR_TX_TRIG_SHIFT) |
((AW_SPI_FIFO_SIZE / 4) << AW_SPI_FCR_RX_TRIG_SHIFT));