[YashAnand69]

The CircuitPython-compatible I2C.scan() documents addresses 0x08 through 0x77, but passes 0x77 as the primitive's exclusive end. Devices responding only at 0x77 are never probed.

Pass 0x78 as the exclusive endpoint. The scan still excludes reserved addresses and emits a STOP for each probed address.

Validation:

• Five public scan cases fail on unchanged main. Command-level ACK responses cover a device only at 0x77, the lower endpoint, multiple devices, no responders and reserved addresses; each checks the full probe range and matching STOPs.
• Available hardware-independent suite: 33 passed (baseline 28); changed line covered and same-subset coverage increases. Configured Black, Flake8, Bandit and pydocstyle checks pass.
• Wheel/source distribution and documentation builds pass. Documentation diagnostics match baseline: five distinct messages, Sphinx counter seven.
• No physical PSLab/sensor or full hardware record/playback validation was performed.

No matching scan-endpoint issue or overlapping open PR found. Developed and tested with OpenAI Codex assistance.

Summary by Sourcery

Correct the CircuitPython-compatible I2C scan range so devices at the highest permitted address are detected.

Bug Fixes:

• Include address 0x77 in CircuitPython-compatible I2C scans by correcting the scan range endpoint.

Tests:

• Add hardware-independent coverage for scan endpoints, reserved addresses, device responses, and matching STOP operations.

Summary by CodeRabbit

• Bug Fixes
  • Corrected the I2C scan range so the highest address, 0x77, is included.
• Tests
  • Added coverage for detected addresses, probe cleanup, and transaction state after scanning.

[sourcery-ai]

Reviewer's Guide

Fixes CircuitPython-compatible I2C scans by making 0x78 the exclusive endpoint, ensuring devices at 0x77 are detected. Adds hardware-independent command-level tests covering the full range, ACK behavior, reserved addresses, and cleanup semantics.

Sequence diagram for the corrected I2C scan range

sequenceDiagram
    participant Caller
    participant I2C
    participant Primitive
    participant Device

    Caller->>I2C: scan()
    I2C->>Primitive: _scan(0x08, 0x78)
    loop Addresses 0x08 through 0x77
        Primitive->>Device: Probe address
        Device-->>Primitive: ACK or no response
        Primitive->>Device: STOP
    end
    Primitive-->>I2C: Responding addresses
    I2C-->>Caller: List of detected addresses

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File-Level Changes

Change	Details	Files
Extend the CircuitPython-compatible I2C scan’s exclusive upper bound so address 0x77 is probed while preserving reserved-address filtering and per-address STOP handling.	Change the scan endpoint from 0x77 to exclusive endpoint 0x78. Add a command-level connection test double that tracks probed and stopped addresses and simulates address-specific ACKs. Cover endpoint-only, lower-endpoint, multiple-device, empty, and reserved-address responder scenarios. Verify the complete 0x08–0x77 probe range, matching STOPs, and cleared bus state.	pslab/bus/busio.py tests/test_busio_i2c_scan.py

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

• Configuration used: defaults
• Review profile: CHILL
• Plan: Advanced
• Run ID: 8637287c-42b7-40b1-aa5c-de09612d1b16

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📥 Commits

Reviewing files that changed from the base of the PR and between 08de0d0 and ec1a66b.

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📒 Files selected for processing (2)

• pslab/bus/busio.py
• tests/test_busio_i2c_scan.py

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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 2 remain after this review.

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📝 Walkthrough

Walkthrough

I2C.scan() now probes addresses from 0x08 through 0x77. New parameterized tests check which addresses are returned and verify that each address is probed and stopped.

Changes

I2C scanning

Layer / File(s)	Summary
Scan range and test coverage pslab/bus/busio.py, tests/test_busio_i2c_scan.py	I2C.scan() changes its exclusive upper bound to 0x78. Parameterized tests check returned addresses, probe and stop calls, and the final connection state.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Bug fix

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Merge Risk: ⚪ Minimal · up to ec1a6

The scan now includes address 0x77. No actionable merge-blocking risk remains after normal checks.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 8 functions across 2 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the main change: including address 0x77 in CircuitPython I2C scans.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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