Datasheet

SAM3X / SAM3A [DATASHEET]
Atmel-11057C-ATARM-SAM3X-SAM3A-Datasheet_23-Mar-15
932
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 descrip-
tor 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.