Adafruit CircuitPython 9.2.8 on 2025-05-28; Raspberry Pi Pico with rp2040

# boot.py for pm2be_emulator

import supervisor
import usb_hid
...

PM2BE_REPORT_DESCRIPTOR = bytes((
0x05, 0x01,        # Usage Page (Generic Desktop Ctrls)
0x09, 0x00,        # Usage (Undefined)
0xA1, 0x01,        # Collection (Application)
0x05, 0x08,        #   Usage Page (LEDs)
0x09, 0x4B,        #   Usage (Generic Indicator)
0x15, 0x00,        #   Logical Minimum (0)
0x25, 0x01,        #   Logical Maximum (1)
0x95, 0x08,        #   Report Count (8)
0x75, 0x01,        #   Report Size (1)
0x91, 0x02,        #   Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0x05, 0x09,        #   Usage Page (Button)
0x15, 0x00,        #   Logical Minimum (0)
0x25, 0x01,        #   Logical Maximum (1)
0x75, 0x01,        #   Report Size (1)
0x95, 0x08,        #   Report Count (8)
0x81, 0x01,        #   Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x19, 0x01,        #   Usage Minimum (0x01)
0x29, 0x0E,        #   Usage Maximum (0x0E)
0x15, 0x00,        #   Logical Minimum (0)
0x25, 0x01,        #   Logical Maximum (1)
0x95, 0x0E,        #   Report Count (14)
0x81, 0x02,        #   Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x95, 0x02,        #   Report Count (2)
0x81, 0x01,        #   Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
0x05, 0xFF,        #   Usage Page (Reserved 0xFF)
0x09, 0x00,        #   Usage (0x00)
0x15, 0x00,        #   Logical Minimum (0)
0x26, 0xFF, 0x00,  #   Logical Maximum (255)
0x75, 0x08,        #   Report Size (8)
0x95, 0x27,        #   Report Count (39)
0xB1, 0x00,        #   Feature (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
0xC0,              # End Collection
))

...

pm2be = usb_hid.Device(
    report_descriptor=PM2BE_REPORT_DESCRIPTOR,
    usage_page=0x01,           # Usage Page (Generic Desktop Ctrls)
    usage=0x00,                # Usage (Undefined)
    report_ids=(0,),           # Descriptor uses report ID 1
    in_report_lengths=(3,),    # This PM2BEL sends 3 bytes in its report.
    out_report_lengths=(8,),   #
)