---
phase: 02-hid-access-validation
plan: 02
subsystem: driver
tags: [hidapi, powershell, verification, steamvr, beyond2, hid]

# Dependency graph
requires:
  - phase: 02-hid-access-validation/plan-01
    provides: "HIDAPI integration in driver DLL, HidDevice RAII wrapper, graceful degradation"
  - phase: 01-skeleton-driver-and-coexistence
    provides: "Skeleton driver, verify_driver.ps1 verification pattern, coexistence validated"
provides:
  - "verify_hid.ps1 script with 9 automated HID/driver checks"
  - "FEAS-02 validated: driver opens Beyond 2 HID from vrserver.exe"
  - "FEAS-04 validated: manifest hmd_presence targets Beyond 2"
  - "HID-01 validated: shared-mode HID access with BeyondHID.exe"
  - "HMD coexistence confirmed: tracking, display, audio unaffected"
affects: [03-proximity-standby-wake, 04-proximity-event-driver]

# Tech tracking
tech-stack:
  added: []
  patterns: ["HID verification script pattern matching verify_driver.ps1"]

key-files:
  created:
    - scripts/verify_hid.ps1
  modified: []

key-decisions:
  - "All 9 automated checks pass on real hardware with BeyondHID.exe running"
  - "FEAS-02, FEAS-04, HID-01 all validated -- Phase 2 feasibility gate passed"
  - "HMD coexistence confirmed via human verification -- tracking, display, audio identical to baseline"

patterns-established:
  - "HID verification script: same Test-Check pattern as verify_driver.ps1 with feasibility gate status output"

requirements-completed: [FEAS-02, FEAS-04, HID-01]

# Metrics
duration: 3min
completed: 2026-03-21
---

# Phase 2 Plan 2: HID Access Validation Summary

**HID verification script with 9 automated checks validates FEAS-02/FEAS-04/HID-01 feasibility gates on real Beyond 2 hardware**

## Performance

- **Duration:** 3 min (continuation from checkpoint approval)
- **Started:** 2026-03-21T00:00:00Z
- **Completed:** 2026-03-21T00:03:00Z
- **Tasks:** 2
- **Files created:** 1

## Accomplishments
- Created verify_hid.ps1 with 9 checks covering build artifacts, system state, and vrserver log analysis
- FEAS-02 validated: driver successfully opens Beyond 2 HID device (VID 0x35BD, PID 0x0101) from within vrserver.exe
- FEAS-04 validated: driver manifest hmd_presence correctly targets "35BD.0101"
- HID-01 validated: shared-mode HID access works with BeyondHID.exe running simultaneously (no contention)
- Human verified: Beyond 2 tracking, display, and audio completely unaffected by HID-enabled driver

## Task Commits

Each task was committed atomically:

1. **Task 1: Create HID verification script** - `3f38776` (feat)
2. **Task 2: Validate HID access with SteamVR and Beyond 2 hardware** - checkpoint:human-verify, APPROVED

## Files Created/Modified
- `scripts/verify_hid.ps1` - HID verification script with 9 automated checks plus FEAS-02/FEAS-04/HID-01 gate status

## Decisions Made
- All 9 automated checks passed on real hardware confirming driver HID integration works correctly
- Phase 2 feasibility gate fully passed: HID access from sidecar driver is viable
- No contention with BeyondHID.exe confirms shared-mode HID works as designed

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Phase 2 complete: all feasibility gates (FEAS-01, FEAS-02, FEAS-04, HID-01) validated
- Ready for Phase 3 (proximity-standby-wake): driver can open HID device, now needs to read proximity sensor data and trigger standby/wake events
- Phase 3 is highest-risk gate: no documentation confirms sidecar /proximity triggers HMD standby/wake
- Blocker resolved: "HID contention with Bigscreen companion app" confirmed NOT an issue

## Self-Check: PASSED

- FOUND: scripts/verify_hid.ps1
- FOUND: commit 3f38776

---
*Phase: 02-hid-access-validation*
*Completed: 2026-03-21*