Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet

573

SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]

11063K–ATARM–05-Nov-13

Note:

1. It is assumed that this command has been correctly sent (see 

).

Send  SELECT/DESELECT_CARD

command

(1)

  to select the card

Send SET_BLOCKLEN command

(1)

 

Write using DMAC

Send WRITE_SINGLE_BLOCK

command

(1)

Configure the DMA channel X
DMAC_DADDRx  = Data Address to write
DMAC_BTSIZE = BlockLength/4

Send WRITE_SINGLE_BLOCK

command

(1)

Read status register HSMCI_SR

Poll the bit

XFRDONE = 0?

Yes

No

Yes

No

Read status register HSMCI_SR

Number of words to write = 0 ?

Poll the bit

TXRDY = 0?

HSMCI_TDR = Data to write

Number of words to write = 
Number of words to write -1

Yes

RETURN

No

Yes

No

Number of words to write = BlockLength/4

DMAC_CHEN[X] = TRUE

Reset the DMAEN bit
HSMCI_DMA &= ~DMAEN
Set the block length (in bytes)
HSMCI_BLKR |= (BlockLength) <<16)
Set the block count (if necessary)
HSMCI_BLKR |= (BlockCount << 0)

Set the DMAEN bit
HSMCI_DMA |= DMAEN
Set the block length (in bytes)
HSMCI_BLKR |= (BlockLength << 16)

RETURN