// sddef.h

typedef enum {
  SDCC_STANDARD,
  SDCC_APP_CMD
} SD_COMMAND_CLASS;
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Windows Driver Kit DDI reference (ne-sddef-sd_command_class)

SD_COMMAND_CLASS enumeration

Description

The SD_COMMAND_CLASS enumeration lists the classes of Secure Digital (SD) card commands.

Constants

`SDCC_STANDARD`

Indicates an SD card command from the standard command set. This command set includes command codes 0 to 63.

`SDCC_APP_CMD`

Indicates an SD command from the application command set. This command set includes command codes 0 to 63, preceded by the application command escape code 55.

SD card drivers should not issue CMD55 (APP_CMD) commands through the SD bus interface. The bus driver will automatically issue the CMD55 command on behalf of the SD card driver when the command class is SDCC_APP_CMD.

SD_COMMAND_CLASS - NtDoc