LAUNCHXL-F28379D: AdaFruit MicroSD Breakout Board and sd_card example not working

I am struggling to get the sd_card example working for the LAUNCHXL-F28379D.  I purchased a MicroSD breakout board from adafruit (www.adafruit.com/.../254).   I made the following connections:

CS->GPIO125, DI->GPIO122, DO->GPIO124, CLK->GPIO123

I believe these are the correct connections from looking at the mmc-F2837x.c file in the example project.  I also tested the pins with a multimeter during debug and they appear to be working correctly.

Unfortunately, I cannot get the disk to initialize.  Specifically, in the disk_intitialize function below, the send_cmd (highlighted in red) times out waiting for a response.

Does anyone have any insight into this problem?  I know that the microsd is working and that the breakout board is at least partially working as the led lights up when toggling the CS.

DSTATUS disk_initialize(BYTE drv /* Physical drive nmuber (0) */)

{
    BYTE n, ty, ocr[4];


    if (drv) return STA_NOINIT;            /* Supports only single drive */
    if (Stat & STA_NODISK) return Stat;    /* No card in the socket */

    power_on();                            /* Force socket power on */
    send_initial_clock_train();

    SELECT();                /* CS = L */
    ty = 0;
    if (send_cmd(CMD0, 0) == 1)              /* Enter Idle state */
    {
        Timer1 = 100;                        /* Initialization timeout of 1000 msec */
        if (send_cmd(CMD8, 0x1AA) == 1)      /* SDC Ver2+ */
        {
            for (n = 0; n < 4; n++) ocr[n] = rcvr_spi();
            if (ocr[2] == 0x01 && ocr[3] == 0xAA)      /* The card can work at vdd range of 2.7-3.6V */
            {
                do
                {
                    if (send_cmd(CMD55, 0) <= 1 && send_cmd(CMD41, 1UL << 30) == 0)    break;    /* ACMD41 with HCS bit */
                }
                while (Timer1);
                if (Timer1 && send_cmd(CMD58, 0) == 0)      /* Check CCS bit */
                {
                    for (n = 0; n < 4; n++) ocr[n] = rcvr_spi();
                    ty = (ocr[0] & 0x40) ? 6 : 2;
                }
            }
        }
        else                                /* SDC Ver1 or MMC */
        {
            ty = (send_cmd(CMD55, 0) <= 1 && send_cmd(CMD41, 0) <= 1) ? 2 : 1;    /* SDC : MMC */
            do
            {
                if (ty == 2)
                {
                    if (send_cmd(CMD55, 0) <= 1 && send_cmd(CMD41, 0) == 0) break;    /* ACMD41 */
                }
                else
                {
                    if (send_cmd(CMD1, 0) == 0) break;                                /* CMD1 */
                }
            }
            while (Timer1);
            if (!Timer1 || send_cmd(CMD16, 512) != 0)    /* Select R/W block length */
                ty = 0;
        }
    }
    CardType = ty;
    DESELECT();            /* CS = H */
    rcvr_spi();            /* Idle (Release DO) */

    if (ty)              /* Initialization succeded */
    {
        Stat &= ~STA_NOINIT;        /* Clear STA_NOINIT */
        set_max_speed();
    }
    else                /* Initialization failed */
    {
        power_off();
    }

    return Stat;
}