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| author | Stefan Kerkmann <karlk90@pm.me> | 2023-07-28 02:05:01 +0200 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2023-07-28 01:05:01 +0100 |
| commit | 32174abcfae373eac2659dd9de255b3c1792d238 (patch) | |
| tree | 9b95b6516a260642de21e8e880ad0d0502c71a02 /tmk_core/protocol/vusb/vusb.c | |
| parent | 3a413e4bad2cad306eba7ecc1604e4a147c905b5 (diff) | |
Update keyboard report descriptor for USB compliance (#21626)
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.
Diffstat (limited to 'tmk_core/protocol/vusb/vusb.c')
| -rw-r--r-- | tmk_core/protocol/vusb/vusb.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tmk_core/protocol/vusb/vusb.c b/tmk_core/protocol/vusb/vusb.c index b3eeff9e01..d74f375f66 100644 --- a/tmk_core/protocol/vusb/vusb.c +++ b/tmk_core/protocol/vusb/vusb.c @@ -435,6 +435,8 @@ const PROGMEM uchar keyboard_hid_report[] = { 0x05, 0x08, // Usage Page (LED) 0x19, 0x01, // Usage Minimum (Num Lock) 0x29, 0x05, // Usage Maximum (Kana) + 0x15, 0x00, // Logical Minimum (0) + 0x25, 0x01, // Logical Maximum (1) 0x95, 0x05, // Report Count (5) 0x75, 0x01, // Report Size (1) 0x91, 0x02, // Output (Data, Variable, Absolute) |