// .....
char buffer[512];
//......

    SDMMC1->IDMABSIZE = (sizeof(buffer)/4/8) << SDMMC_IDMABSIZE_IDMABNDT_Pos;
    SDMMC1->IDMACTRL |= SDMMC_IDMA_IDMAEN_Msk;
    SDMMC1->IDMABASER = (unsigned int)buffer;

    SDMMC1->DLEN   = sizeof(buffer);
    SDMMC1->DTIMER = 0xFFFFFFFF;           // max timeout
    SDMMC1->DCTRL = (9<<SDMMC_DCTRL_DBLOCKSIZE_Pos) |
        SDMMC_DCTRL_DTDIR     // read
        | SDMMC_DCTRL_DTEN;

    while(!(SDMMC1->STA & SDMMC_STA_DPSMACT));

    SDMMC1->ICR |= 0xFFFFFFFF;

    SDMMC1->ARG = lba;
    SDMMC1->CMD = (17 << SDMMC_CMD_CMDINDEX_Pos) |
                    SDMMC_CMD_WAITRESP_0 |
                    SDMMC_CMD_CPSMEN;

    while (!(SDMMC1->STA & (SDMMC_STA_CMDSENT | SDMMC_STA_CMDREND | SDMMC_STA_CTIMEOUT | SDMMC_STA_CCRCFAIL)));

    if(SDMMC1->STA & SDMMC_STA_CTIMEOUT || SDMMC1->STA & SDMMC_STA_CCRCFAIL){
        return ;
    }

// here infinite loop. I use debugger to check buffer value.