
723
11028E–ATARM–22-Apr-13
SAM9G46
h.
Program LLI_W(n).DMAC_CFGx register for channel x with the following field’s
values:
–FIFOCFG defines the watermark of the DMA channel FIFO.
–DST_REP is set to zero. Addresses are contiguous.
–SRC_H2SEL is set to true to enable hardware handshaking on the destination.
–SRC_PER is programmed with the hardware handshaking ID of the targeted
HSMCI Host Controller.
i.
Program LLI_W(n).DMAC_DSCRx with the address of LLI_W(n+1) descriptor. And
set the DSCRx_IF to the AHB Layer ID. This operation actually links descriptors
together. If LLI_W(n) is the last descriptor then LLI_W(n).DMAC_DSCRx points to
0.
j.
Program DMAC_CTRLBx register for channel x with 0. its content is updated with
the LLI Fetch operation.
k.
Program DMAC_DSCRx register for channel x with the address of LLI_W(0).
l.
Enable Channel x writing one to DMAC_CHER[x]. The DMA is ready and waiting
for request.
8.
Poll CBTC[x] bit in the DMAC_EBCISR Register.
9.
If a new list of buffer shall be transferred repeat step 6. Check and handle HSMCI
errors.
10. Poll FIFOEMPTY field in the HSMCI_SR.
11. Send The STOP_TRANSMISSION command writing the HSMCI_ARG then the
HSMCI_CMDR.
12. Wait for XFRDONE in HSMCI_SR register.
36.8.8.2
Block Length is Not Multiple of 4. (ROPT field in HSMCI_DMA register set to 0)
Two DMA Transfer descriptors are used to perform the HSMCI block transfer.
1.
Use the previous step to configure the HSMCI to perform a READ_MULTIPLE_BLOCK
command.
2.
Issue a READ_MULTIPLE_BLOCK command.
3.
Program the DMA Controller to use a list of descriptors.
a.
Read the channel register to choose an available (disabled) channel.
b.
Clear any pending interrupts on the channel from the previous DMAC transfer by
reading the DMAC_EBCISR register.
c.
For every block of data repeat the following procedure:
d.
Program the channel registers in the Memory for the first descriptor. This descriptor
will be word oriented. This descriptor is referred to as LLI_W(n) standing for LLI
word oriented transfer for block n.
e.
The LLI_W(n).DMAC_SADDRx field in memory must be set with the starting
address of the HSMCI_FIFO address.
f.
The LLI_W(n).DMAC_DADDRx field in the memory must be word aligned.
g.
Program LLI_W(n).DMAC_CTRLAx with the following field’s values:
–DST_WIDTH is set to WORD.
–SRC_WIDTH is set to WORD.
–SCSIZE must be set according to the value of HSMCI_DMA, CHKSIZE field.
–BTSIZE is programmed with block_length/4. If BTSIZE is zero, this descriptor is
skipped later.