SD卡读写配置流程图
2019-11-11 13:44:23 0 举报
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SD卡读写配置流程图
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BUS WIDTH 1-BIT
1-bit
set sdclk frequency
TRANS DIR WRDAT PRES OFF
400KB/.../12M/24M
set sdio control block count
set sdio control block size
check card type
set DMA lengthset mramset DMA hw start
set card block size
start
BUS WIDTH 4-BIT
check card bus width
set sdio control bus width
fixed 512 bytes
set card bus width
4-bit
end
set trans mode
DMA Init
send CMD55(arg=RCA)send ACMD6
card type=SDSC
send CMD16
card type=SDHC/SDXC
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