HID Gamepad Report Descriptor issue

[kbishop]

I am working on a usbHidReportDescriptor and am having an issue with adding buttons to the report.

When I use this descriptor that I did not make (only stick axis, no buttons):

Code: Select all

PROGMEM const char usbHidReportDescriptor[36] = {
0x05, 0x01,                    // USAGE_PAGE (Generic Desktop)
0x09, 0x05,                    // USAGE (Game Pad)
0xa1, 0x01,                    // COLLECTION (Application)
0xa1, 0x00,                    //   COLLECTION (Physical)
0x05, 0x01,                    //     USAGE_PAGE (Generic Desktop)
0x09, 0x30,                    //     USAGE (X)
0x09, 0x31,                    //     USAGE (Y)
0x09, 0x32,                    //     USAGE (Z) rx
0x09, 0x35,                    //     USAGE (Rx) ry
0x35, 0x00,                    //     PHYSICAL_MINIMUM (0)
0x46, 0xff, 0x00,              //     PHYSICAL_MAXIMUM (255)
0x15, 0x00,                    //     LOGICAL_MINIMUM (-127)
0x26, 0xff, 0x00,                    //     LOGICAL_MAXIMUM (127)
0x75, 0x08,                    //     REPORT_SIZE (8)
0x95, 0x04,                    //     REPORT_COUNT (4)
0x81, 0x02,                    //     INPUT (Data,Var,Abs)
0xc0,                          //   END_COLLECTION
0xc0                           // END_COLLECTION
};

My device gets recognized just fine and works how I hope, minus the buttons. I created a custom report to add buttons, and this is what I have:

Code: Select all

PROGMEM const char usbHidReportDescriptor[46] = {
  0x05, 0x01,               //USAGE_PAGE (Generic Desktop)
  0x09, 0x05,               //USAGE (Game Pad)
  0xa1, 0x01,               //
  0xa1, 0x00,                    //   COLLECTION (Physical)
  0x05, 0x09,                   //USAGE_PAGE (Button)
  0x19, 0x01,               //USAGE_MINIMUM (Button1)
  0x29, 0x10,               //USAGE_MAXIMUM (Button 16)
  0x15, 0x00,               //LOGICAL_MINIMUM (0)
  0x25, 0x01,               //LOGICAL_MAXIMUM(1)
  0x95, 0x10,               //REPORT_COUNT (16)
  0x75, 0x01,               //REPORT_SIZE (1)
  0x81, 0x02,               //INPUT(Data, Var, Abs)
  0x05, 0x01,               //USAGE_PAGE (Generic Desktop)
  0x09, 0x30,               //USAGE (X)
  0x09, 0x31,               //USAGE (Y)
  0x09, 0x32,               //USAGE (Z)
  0x09, 0x33,               //USAGE (Rx)
  0x15, 0x81,               //LOGICAL_MINIMUM(-127)
  0x25, 0x7f,               //LOGICAL_MAXIMUM(127)
  0x75, 0x08,               //REPORT_SIZE(8)
  0x95, 0x04,               //REPORT_COUNT(4)
  0x81, 0x02,               //INPUT(Data,Var,Abs)
  0xc0,                  //END_Collection
  0xc0                  //END_Collection

This is the only code change I'm making, even though the code is set to handle button inputs in the gamepad_report struct and method calling it. Does anyone see anything I'm doing wrong in the second iteration? I'm getting no compiler errors. Thank you very much for any help!

[kbishop]

I guess I can't edit since I didnt login. Worth noting that the line without the comment description is //COLLECTION (APPLICATION)

And when I use the device with the second block, it throws the "This device cannot start. (Code 10)" in the device profile. So this is breaking it somehow xD

[kbishop]

Just wanted to post my solution in case someone else has this issue:

"Got the issue sorted out after having a simple realization. Just did a find in files of: usbHidReportDescriptor and found that there was a definition for length in the usbconfig.h file that I needed to adjust. Just posting this in case anyone has the same issue down the line!"