The C header file "HID_Report.h" provides preprocessor macros which allows to write HID Reportsin a notation which looks similar to the notation used in HID Report Standard [1]. The usage tables defined in [2] are partly defined in the header file.
This Header file is still work in progress.
The macros allows to write the keybord example shown in section E.6 of [1] as:
static const uint8_t hid_example_E6[] = {
USAGE_PAGE (GENERIC_DESKTOP_CONTROLS),
USAGE (KEYBOARD),
COLLECTION (APPLICATION),
USAGE_PAGE (KEYBOARD_KEYPAD),
USAGE_MINIMUM (224),
USAGE_MAXIMUM (231),
LOGICAL_MINIMUM (0),
LOGICAL_MAXIMUM (1),
REPORT_SIZE (1),
REPORT_COUNT (8),
INPUT (DATA | VARIABLE | ABSOLUTE),
REPORT_COUNT (1),
REPORT_SIZE (8),
INPUT (CONSTANT),
REPORT_COUNT (5),
REPORT_SIZE (1),
USAGE_PAGE (LEDS),
USAGE_MINIMUM (1),
USAGE_MAXIMUM (5),
OUTPUT (DATA | VARIABLE | ABSOLUTE),
REPORT_COUNT (1),
REPORT_SIZE (3),
OUTPUT (CONSTANT),
REPORT_COUNT (6),
REPORT_SIZE (8),
LOGICAL_MINIMUM (0),
LOGICAL_MAXIMUM (101),
USAGE_PAGE (KEYBOARD_KEYPAD),
USAGE_MINIMUM (0),
USAGE_MAXIMUM (101),
INPUT (DATA | ARRAY),
END_COLLECTION
};[1] Device Class Definition for Human Interface Devices (HID) (6/27/01) Version 1.11 (https://usb.org/document-library/device-class-definition-hid-111)
[2] HID Usage Tables (10/28/2004) Version 1.12 (https://usb.org/document-library/hid-usage-tables-112)