SD卡读/写操作流程图
2019-11-11 13:44:22 0 举报SD卡读/写操作流程图
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TRANS DIR WRDAT PRES ON
set dma saddr
send CMD7(arg=RCA)
start write
TRANS DIR RDDAT PRES ON
send CMD24
TRANS DIR WRDAT PRES OFF
send CMD7(arg=0)
end read
multi blocks mode
select card
send CMD17
send CMD23(multi blocks mode)
end write
start read
set trans mode
single block mode
send CMD18
check single/multi mode
send CMD25
cancel selected card
wait data comple
read multi blocks
write multi blocks
SDIO R/W config
set card block count
write single block
read single block
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