Maxim Integrated MAX32665 - Figure 9-1: DMA Block-Chaining Flowchart

MAX32665-MAX32668 User Guide
Maxim Integrated Page 229 of 457
Figure 9-1: DMA Block-Chaining Flowchart
DMA TRANSFER
RESET DMA
rlden = 0
chen = 0
ctz_st = 1
CONFIGURE DMA
TRANSFER PARAMETERS
Set brst, dstinc, dstwd,
srcinc, and srcwd
CONFIGURE DMA
TRANSFER PARAMETERS
Set DMACHn_SRC,
DMACHn_DST, and
DMACHn_CNT
Need to send
more data than specified
in DMACHn_CNT?
DMA TRANSFER
COMPLETE
START DMA TRANSFER
rlden = 0
chen = 1
WAIT FOR TRANSFER
COMPLETE
ch_st == 0
(Set chdien = 1 to generate
interrupt on completion.)
CLEAR CTZ FLAG
ctz_st = 1
CONFIGURE RELOAD
VALUES
Set DMAn_SRC_RLD,
DMAn_DST_RLD, and
DMA_CNT_RLD
WAIT FOR TRANSFER
PAUSED
ch_st == 0
(Set ctzien = 1 to generate
interrupt on channel
stop.)
PAUSE DMA TRANSFER
chen = 0
WAIT FOR RELOAD TO
OCCUR
ctz_st == 1
(Set ctzien = 1 to generate
interrupt on reload.)
START DMA TRANSFER
rlden = 1
chen = 1
DMACHn_CNT
and DMA_CNT_RLD both
Transferred?
CNT == 0?
Need to send more
datathan specified in
DMACHn_CNT?
Y
N
Y
N
N
Y