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Running the "HID Tests" suite of the USB 3 Command Verifier (USB3CV) tool resulted in the following error: (HID: 3.2.61) The report descriptor returned in response to a GetDescriptor(Report) must be compliant with the HID specification. Byte Number: 37h ( 55d) Data Field: 91 02 Mnemonic: Output Value: (Variable) Errors: Error: LOGICAL MAX MUST be bounded by Report Size The error stems from the fact that logical minimum and maximum are global items, which means that the next item in a report descriptor inherits the value from the previously set value. In this case the status leds item inherited the logical minimum (=0) and maximum (=255) from the keycodes item. As the status leds set a report size of 1 bit, wich can only hold a boolean, it becomes clear that this range would never fit. The fix is straightforward, we just define a appropriate logical maximum (=1), the mismatch is solved and our keyboard now passes the compliance tests. Defining the logical minimum is redundant in this case but is kept to form a logical block. |
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| .. | ||
| protocol.c | ||
| usb_util.c | ||
| usbconfig.h | ||
| vusb.c | ||
| vusb.h | ||
| vusb.mk | ||