AX_SPI_RXFIFO
xspi->current_rx_fifo_word_for_irq = ax_spi_read(xspi, AX_SPI_RXFIFO);
ax_spi_read(xspi, AX_SPI_RXFIFO);
ax_spi_read(xspi, AX_SPI_RXFIFO); // Read and discard
xspi->current_rx_fifo_word = ax_spi_read(xspi, AX_SPI_RXFIFO);