Function init_sd

components/drivers/sdio/dev_sd.c:816–869

* Starting point for SD card init. */

 * Starting point for SD card init.
 */
rt_int32_t init_sd(struct rt_mmcsd_host *host, rt_uint32_t ocr)
{
    rt_int32_t err = -RT_EINVAL;
    rt_uint32_t  current_ocr;
    /*
     * We need to get OCR a different way for SPI.
     */
    if (controller_is_spi(host))
    {
        mmcsd_go_idle(host);

        err = mmcsd_spi_read_ocr(host, 0, &ocr);
        if (err)
            goto _err;
    }

    current_ocr = mmcsd_select_voltage(host, ocr);

    /*
     * Can we support the voltage(s) of the card(s)?
     */
    if (!current_ocr)
    {
        err = -RT_ERROR;
        goto _err;
    }

    /*
     * Detect and init the card.
     */
    err = mmcsd_sd_init_card(host, current_ocr);
    if (err)
        goto _err;

    mmcsd_host_unlock(host);

    err = rt_mmcsd_blk_probe(host->card);
    if (err)
        goto remove_card;
    mmcsd_host_lock(host);

    return 0;

remove_card:
    mmcsd_host_lock(host);
    rt_mmcsd_blk_remove(host->card);
    rt_free(host->card);
    host->card = RT_NULL;
_err:

    LOG_D("init SD card failed!");

    return err;
}