Ports and Interfaces > USB

descriptor madness.

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ulao:
I have this monster descriptor (that works) that I need to add one more piece too. It's too big for this forum.
https://pastebin.com/kBpV9Ld1

In that example I added the extra part as a dual device but this is causing a bug in windows.

The part I'm adding is at the end looks like this

--- Code: ---  //api
0x06, 0x00, 0xff,         
0x09, 0x01, // USAGE (Vendor Usage 1)
 
 
    0xa1, 0x01,                    // COLLECTION (Application)
    0x15, 0x00,                    //   LOGICAL_MINIMUM (0)
    0x26, 0xff, 0x00,              //   LOGICAL_MAXIMUM (255)
    0x75, 0x08,                    //   REPORT_SIZE (8)
 
        //generic (64 size) - good speed coudl always make a smaller packet
 
        //get
        0x85, 0x11,                    //   REPORT_ID (17)
        0x95, 0x20,                    //   REPORT_COUNT (64)
        0x09, 0x00,                    //   USAGE (Undefined)
        0xb2, 0x02, 0x01,              //   FEATURE (Data,Var,Abs,Buf)
 
        //send
        0x85, 0x12,                    //   REPORT_ID (18)
        0x95, 0x44,                    //   REPORT_COUNT (68) 64+(rid,command, 0, 0)
        0x09, 0x00,                    //   USAGE (Undefined)
        0xb2, 0x02, 0x01,              //   FEATURE (Data,Var,Abs,Buf)
   
        //LDC DC
       
        //get
        0x85, 0x13,                    //   REPORT_ID (19)
        0x95, 0xc0,                    //   REPORT_COUNT (192)
        0x09, 0x00,                    //   USAGE (Undefined)
        0xb2, 0x02, 0x01,              //   FEATURE (Data,Var,Abs,Buf)
 
        //send
        0x85, 0x14,                    //   REPORT_ID (20)
        0x95, 0xc4,                    //   REPORT_COUNT (196) 192+(rid,command, 0, 0)
        0x09, 0x00,                    //   USAGE (Undefined)
        0xb2, 0x02, 0x01,              //   FEATURE (Data,Var,Abs,Buf)
    0xc0,                           // END_COLLECTION
--- End code ---

When doing this windows lists this device twice in the game controller list. Causing mayhem on the OS. If I put this section in side the first report windows is happy but linux gets all mad.

example.
https://pastebin.com/NCSP6WJ1

I guess I prefer the second one but where can I put this "api" as I call it so that it does not cause issues.
 

Jan Axelson:
It look like you want to add four Feature reports either within your existing collection or as a second collection?

You could try this:

http://eleccelerator.com/usbdescreqparser/

In Windows, be sure to uninstall the current device before reattaching with new descriptors.

ulao:
yeah definitely removing drivers. The parser seems to like it both ways. Windows likes it with in the same collection but something about linux does not. When I keep it separate windows has a bug but linux likes it. Very strange bug. I'll play with the parser a bit and see if I can make it work. 

it's not really two collections, its more like two devices. Normally when I make two  Usage Page's like that I get two device. For example a mouse and a keyboard.  In this case its a gamepad and a hid generic. For some reason windows thinks I have two joysticks. (second example I pasted).  In the first example I put all collections under the gamepad device.  That works fine in widows but causes issue in linux. I'm not really sure why.

Jan Axelson:
Each top-level application collection defines a HID function/device. See 6.2.2.6 in the HID spec.

ulao:
I'm was able to figure out the issue on the linux side

   0x75,0x08,                      //    Report Size 1
   0x95,0x20,                      //    Report Count 1

My size Is apparently too big.  If I change to   0x95,0x05,  its fine.

So I guess I need to keep things as two devices and fix this windows bug. I tried to capture this in an image. Moving that section out of the main usage creates duplicate controllers.

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