Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet
Product codes
ATSAM4S-WPIR-RD
SAM4S Series [DATASHEET]
Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14
894
Figure 38-9.
Write Functional Flow Diagram
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 PDC
Reset the PDCMODE bit
HSMCI_MR &= ~PDCMODE
Set the block length
HSMCI_BLKR |= (BlockLength <<16)
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)
HSMCI_MR |= PDCMODE
Set the block length
HSMCI_BLKR |= (BlockLength << 16)
Configure the PDC channel
HSMCI_TPR = Data Buffer Address
HSMCI_TCR = BlockLength/4
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
Number of words to write -1
Yes
RETURN
No
Yes
No
Number of words to write = BlockLength/4
HSMCI_PTCR = TXTEN