static void transfer(int fd)
{
    /*Just try and read the JEDEC ID from the SPI NOR flash for now*/

    int ret;
    uint8_t tx[20] = {RDID,};

    uint8_t rx[20] = {0,};

    struct spi_ioc_transfer trans;
    memset(&trans, 0, sizeof(struct spi_ioc_transfer));

    trans.tx_buf = (unsigned long)tx;
    trans.rx_buf = (unsigned long)rx;
    trans.len = ARRAY_SIZE(tx);
    trans.delay_usecs = delay;
    trans.speed_hz = speed;
    trans.bits_per_word = bits;
        trans.cs_change = 0;

    ret = ioctl(fd, SPI_IOC_MESSAGE(1), &trans);
    if (ret < 1) {
        pabort("failed to send spi message");
    }

    for (ret = 0; ret < ARRAY_SIZE(rx); ret++) {
        if (!(ret % 6)) {
            puts("");
        }
        printf("%.2X ", rx[ret]);
    }
    puts("");
}