static BOOL ReadBlock (U32 bl, U8 *buf, U32 cnt) {
/* Read one or more 512 byte blocks from Flash Card. */
U32 i;

SDIO->DLEN = cnt * 512;
SDIO->DTIMER = cnt * DATA_RD_TOUT_VALUE;

SDIO->DCTRL = SDIO_DCTRL_DBLOCKSIZE_3 | SDIO_DCTRL_DBLOCKSIZE_0 |
SDIO_DCTRL_DMAEN | SDIO_DCTRL_DTDIR |
SDIO_DCTRL_DTEN ;

for (i = DMA_TOUT; i; i--) {
if (DMA2->LISR & DMA_LISR_TEIF3) {
break;
}

if (DMA2->LISR & DMA_LISR_TCIF3) {
if ((SDIO->STA & (SDIO_STA_DBCKEND|SDIO_STA_DATAEND)) == (SDIO_STA_DBCKEND|SDIO_STA_DATAEND)) {
/* Data transfer finished. */
return (__TRUE);
}
}
}
/* DMA Transfer timeout. */
return (__FALSE);
}