Function _send_cmd

components/drivers/spi/dev_spi_msd.c:137–268

}

static rt_err_t _send_cmd(
    struct rt_spi_device *device,
    uint8_t cmd,
    uint32_t arg,
    uint8_t crc,
    response_type type,
    uint8_t *response
)
{
    struct rt_spi_message message;
    uint8_t cmd_buffer[8];
    uint8_t recv_buffer[sizeof(cmd_buffer)];
    uint32_t i;

    cmd_buffer[0] = DUMMY;
    cmd_buffer[1] = (cmd | 0x40);
    cmd_buffer[2] = (uint8_t)(arg >> 24);
    cmd_buffer[3] = (uint8_t)(arg >> 16);
    cmd_buffer[4] = (uint8_t)(arg >> 8);
    cmd_buffer[5] = (uint8_t)(arg);

    if (crc == 0x00)
    {
        crc = crc7(&cmd_buffer[1], 5);
        crc = (crc << 1) | 0x01;
    }
    cmd_buffer[6] = (crc);

    cmd_buffer[7] = DUMMY;

    /* initial message */
    message.send_buf = cmd_buffer;
    message.recv_buf = recv_buffer;
    message.length = sizeof(cmd_buffer);
    message.cs_take = message.cs_release = 0;

    _wait_ready(device);

    /* transfer message */
    device->bus->ops->xfer(device, &message);

    for (i = CARD_NCR; i < (CARD_NCR_MAX + 1); i++)
    {
        uint8_t send = DUMMY;

        /* initial message */
        message.send_buf = &send;
        message.recv_buf = response;
        message.length = 1;
        message.cs_take = message.cs_release = 0;

        /* transfer message */
        device->bus->ops->xfer(device, &message);

        if (0 == (response[0] & 0x80))
        {
            break;
        }