Phase 2 Tier 1 Documentation Review Checklist¶

Created: 2025-11-19 Purpose: Track documentation updates required for Phase 2 time synchronization implementation Status: In Progress

Overview¶

Phase 2 introduces hybrid time synchronization for bilateral motor coordination between peer devices. This requires updates to multiple specification and architecture documents to ensure consistency across the codebase.

Key Changes: - Hybrid sync approach (initial connection + periodic 10-60s corrections) - ±100ms timing accuracy requirement - Synchronized fallback operation during BLE disconnects - JPL-compliant time sync module implementation

Tier 1 - Critical Documents¶

CLAUDE.md¶

Update project phase status to "Phase 2 - Time Synchronization" (Currently: v0.2.0-beta.1, Phase 1c Complete)
Add Phase 2 section documenting time sync implementation
Update "Future Work Considerations" to reflect completed time sync work
Add build commands for Phase 2 time sync test environment
Document new time_sync.h/c module and API

Priority: HIGH - Primary reference document for Claude Code

README.md¶

Update project phase to Phase 2
Add time synchronization to feature list
Update version number if bumping to v0.3.0
Verify quick start instructions include Phase 2 builds

Priority: HIGH - Public-facing documentation

docs/requirements_spec.md¶

Verify FR002 (Bilateral Alternation) timing requirements match ±100ms
Update FR004 (Battery Life) with sync protocol power budget
Add FR0XX for time synchronization accuracy requirement
Update NFR001 (Reliability) with sync fallback behavior
Document BLE message overhead for sync beacons

Priority: CRITICAL - Defines project requirements

docs/architecture_decisions.md¶

AD028 - Command-and-Control Architecture¶

Update from pure command-based to hybrid sync approach
Document periodic sync beacon protocol (10-60s intervals)
Add exponential backoff strategy for sync intervals
Update fallback behavior section for disconnect scenarios
Status: Needs major revision

AD029 - Timing Requirements and Accuracy¶

Confirm ±100ms accuracy specification
Document achieved accuracy with hybrid sync (measured vs specified)
Add crystal drift analysis (±10 PPM ESP32-C6)
Status: Verify current spec, add measurements

AD036 - Time Synchronization Architecture (NEW)¶

Create comprehensive AD documenting hybrid sync design
Document three-phase protocol (connection, periodic, command)
Include state machine diagrams for sync protocol
Add battery impact analysis
Document sync quality metrics
Status: NEW - requires creation

AD010 - Race Condition Prevention¶

Update with time sync race conditions (if any)
Document sync message ordering guarantees
Add timestamp wraparound handling (32-bit overflow)
Status: Review and update if needed

Priority: CRITICAL - Core architecture documentation

Tier 2 - Implementation Guides¶

QUICK_START.md¶

Add Phase 2 build instructions
Document time sync testing procedure
Update "What's Next" section to reflect Phase 2 completion
Add troubleshooting for sync issues

Priority: MEDIUM - User onboarding

BUILD_COMMANDS.md¶

Add build command for Phase 2 test environment
Document time sync validation commands
Add monitoring commands for sync quality metrics

Priority: MEDIUM - Developer reference

test/README.md¶

Document time_sync_test.c purpose and usage
Add test procedures for timing validation
Include oscilloscope measurement instructions
Document expected sync accuracy results

Priority: MEDIUM - Test documentation

Tier 3 - Supporting Documentation¶

Session Summaries¶

Create SESSION_SUMMARY_PHASE_2.md upon completion
Document design decisions made during implementation
Include testing results and validation data
Add lessons learned and gotchas

Priority: LOW - Historical record

CHANGELOG.md¶

Add [Unreleased] section for Phase 2 changes
Document new features (time sync module)
List API additions and changes
Note any breaking changes to existing code

Priority: MEDIUM - Version tracking

Review Criteria¶

Before marking Phase 2 complete, verify:

Consistency Checks¶

All timing specifications use ±100ms accuracy
Battery impact documented consistently across all docs
Sync interval range (10-60s) mentioned uniformly
Fallback behavior described identically in all locations

JPL Compliance Documentation¶

All new code follows JPL Power of Ten rules
Static allocation verified and documented
Loop bounds documented with max iteration counts
Watchdog subscription verified for time sync task
Error handling documented for all sync operations

Testing Documentation¶

Test procedures clearly documented
Expected results specified with tolerances
Failure modes and troubleshooting included
Hardware requirements listed (oscilloscope, etc.)

API Documentation¶

All public functions in time_sync.h documented
Parameter ranges and units specified
Return value meanings documented
Usage examples provided

Implementation Notes¶

Document Update Order (Recommended)¶

docs/architecture_decisions.md (AD036 - new, AD028 - update, AD029 - verify)
Establishes technical foundation for other docs
Must be complete before updating specs
docs/requirements_spec.md
Updates requirements based on architecture
Needed before updating user-facing docs
CLAUDE.md
Primary reference for Claude Code
Integrates architecture and requirements
README.md and QUICK_START.md
User-facing documentation
Reflects completed implementation
BUILD_COMMANDS.md and test/README.md
Developer reference
Documents testing and validation
CHANGELOG.md and session summaries
Historical record
Created when implementation complete

Completion Tracking¶

Documents Updated: 0 / 15 Status: Not Started Target Completion: TBD (when Phase 2 implementation complete)

Notes¶

Keep this checklist updated as implementation progresses
Mark items complete only after review for consistency
Document any deviations from original plan in session summary
Cross-reference related ADs when making updates