disk_access_spi_sdhc: Missing stop/end bit #33479
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area: Disk Access
area: Drivers
bug
The issue is a bug, or the PR is fixing a bug
priority: low
Low impact/importance bug
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richardbarlow
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Mar 18, 2021
The SD Card Physical Layer specification states in Table 7-1 (in section 7.3.1.1) that the LSB of the 48 bit command must be set to 1 to act as an 'end bit'. Fixes zephyrproject-rtos#33479 Signed-off-by: Rich Barlow <[email protected]>
jfischer-no
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area: Disk Access
area: Drivers
priority: low
MaureenHelm
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Mar 19, 2021
The SD Card Physical Layer specification states in Table 7-1 (in section 7.3.1.1) that the LSB of the 48 bit command must be set to 1 to act as an 'end bit'. Fixes #33479 Signed-off-by: Rich Barlow <[email protected]>
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Describe the bug
The SD Card Physical Layer specification states in Table 7-1 (in section 7.3.1.1) that the LSB of the 48 bit command must be set to 1 to act as an 'end bit'. Zephyr currently does not set the LSB to 1 and this deviation from the standard prevents the implementation as it is from functioning with a Swissbit SFSD8192N3BM1TO-I-GE-2B1-STD (8GB microSD). Simply setting the LSB of the CRC byte to 1 in
sdhc_spi_tx_cmdfixes the issue and Zephyr can then communicate with the card.I will create a pull-request with the necessary change.
I suspect that this issue is the root cause of #29946 and #27841.
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