Datasheet

SAM4E [DATASHEET]
Atmel-11157D-ATARM-SAM4E16-SAM4E8-Datasheet_12-Jun-14
1114
Figure 41-9. Write Functional Flow Diagram
Note: 1. It is assumed that this command has been correctly sent (see Figure 41-7).
The flowchart in Figure 41-10 shows how to manage a multiple write block transfer with the PDC. Polling or
interrupt method can be used to wait for the end of write according to the contents of the HSMCI_IMR.
Send SELECT/DESELECT_CARD
command
(1)
to select the card
Send SET_BLOCKLEN command
(1)
Write using PDC
Reset the PDCMODE bit
HSMCI_MR &= ~PDCMODE
Set the block length
HSMCI_BLKR |= (BlockLength <<16)
Send WRITE_SINGLE_BLOCK
command
(1)
Set the PDCMODE bit
HSMCI_MR |= PDCMODE
Set the block length
HSMCI_BLKR |= (BlockLength << 16)
Configure the PDC channel
HSMCI_TPR = Data Buffer Address
HSMCI_TCR = BlockLength/4
Send WRITE_SINGLE_BLOCK
command
(1)
Read status register HSMCI_SR
Poll the bit
NOTBUSY= 0?
Yes
RETURN
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
HSMCI_PTCR = TXTEN