I need 8 bits of out of band data (configuration / noise reading) on my CDC USB device, and I figured I could return that in the LSB of the bcdDevice in the DeviceDescriptor... but it seems that Windows only reads that on "Plug In Event" -- even if you use DeviceIOCtl on the hub to "re-read" the DeviceDescriptor (it doesn't hit the breakpoint in my device and it sticks with a constant bcdDevice after it's been plugged in -- I understand the MSB needs to be >2, but it all seems to be cached).
A. Is there a way to "force" Windows to re-read the bcdDevice (preferably while the port is opened)? Or any other string or byte (they all seem to be cached)?
B. Is there a way to "force" Windows to read (and accept what's given verbatim) the BaudRate (I figured I could use the MSB of the BaudRate for the status, but Windows doesn't believe that that's a valid number so it just reports "9600, I guess" -- and doesn't read it unless I close and reopen the port -- and then it tries to set the baud rate without being told to)?
C. Is there any other way to get 1 byte in/out of my device without Windows playing silly games? I don't really want my device to show up as 2 com ports (one for config, one for data), but then I'd have to figure out which is which and it would be confusing for the user -- Any other register/USB message -- DSR, CTS, RI, CD - but I need 4 more bits in and at least 3 bits out -- and it needs to be "raw" -- no "If CD, then DSR has to be OK" --
(once configured, the "UseTermination/InvertData/DriveStrength" is stored in flash in the device, so it's just a serial port, but I need to read the "noiselevel" [8 bits req'd], and set those registers --only when requested!-- when commissioning the device)...
