javascript - CCID slot status byte -

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reading ccid specifications, wondering intrinsic structure of slot status (bstatus byte), set in header of response (inbound bulk transfer) message.

only first 2 , last 2 bits used bmiccstatus , bmcommandstatus, i'm not sure how.

given (javascript) binary notation 0bxx0000yy, true bmcommandstatus represented xx?

given (javascript) binary notation 0bxx0000yy:

  • xx .. bmcommandstatus (mask 0xc0)
  • yy .. bmiccstatus (mask 0x03)

reference here (i did check ccid rev 1.1, unable find bit order here -- i.e. msb first or lsb first).

you might find using wireshark extremely useful supports usb sniffing ccid support.


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