v0.28.0 - Critical Bug Fixes

Release v0.28.0 - 2026-03-01

🐛 Critical Bug Fixes

This release addresses 4 production-critical bugs affecting real users:

1. DAQ InterleavedMode Fix (#210, WP-18)

• Impact: ERR_OUT_OF_RANGE when configuring DAQ with interleavedMode=True
• Root Cause: Sequence counter byte not included in overhead calculation
• Fix: Correctly calculates frame overhead for interleaved mode
• Affected: Dynamic DAQ allocation with interleaved slaves
• Credit: @starryfei for excellent bug report

2. MDF Timestamp Conversion (Discussion #270, WP-13)

• Impact: INCA error 'File contains reverse time stamps'
• Root Cause: Timestamps exported as nanoseconds instead of seconds
• Fix: Converts to seconds per ASAM MDF v4 specification
• Affected: xmraw → MDF conversion, INCA/asamdf compatibility
• Credit: @bobejo for detailed investigation

3. DaqRecorder Unmap Error (#269, WP-12)

• Impact: Spurious RuntimeError when stopping DAQ recording
• Root Cause: Stale errno causing false 'Resource temporarily unavailable'
• Fix: Clears errno before unmap() calls in C++ code
• Affected: DaqRecorder finalize/resize operations
• Credit: @bobejo for POSIX insights

4. xcp-profile CLI Script (Bonus Fix)

• Impact: 'xcp-profile convert file.toml -o output.py' crashed
• Root Cause: Incompatible trait configuration, no positional arg support
• Fix: Added positional argument parsing and proper exit codes
• Affected: Configuration file conversion workflow

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📊 Testing

• ✅ 312/312 tests passing
• ✅ Validated against ETH server (interleavedMode=True)
• ✅ Validated against CAN server (interleavedMode=False)
• ✅ No regressions detected

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📝 What Changed

DAQ System:

• \pyxcp/daq_stim/init.py: InterleavedMode overhead calculation

Recorder:

• \pyxcp/recorder/writer.hpp: errno handling in unmap operations
• \pyxcp/recorder/converter/init.py: MDF timestamp conversion
• \pyxcp/examples/ex_mdf.py: MDF timestamp conversion

Configuration:

• \pyxcp/config/init.py: xcp-profile positional arguments

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🙏 Community Impact

Issues Resolved:

• Closed #156: DAQ data retrieval (feature available since v0.22)
• Fixed #210: ERR_OUT_OF_RANGE with interleavedMode
• Fixed #269: DaqRecorder unmap error
• Fixed Discussion #270: MDF timestamp conversion

Special Thanks:

• @starryfei for identifying the interleavedMode sequence counter issue
• @bobejo for two critical bug reports with excellent diagnostics

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🚀 Upgrade Recommendation

HIGH PRIORITY if you:

• Use DAQ with slaves that have interleavedMode=True
• Export xmraw files to MDF format for use with INCA/Vector tools
• Experience spurious errors when stopping DaqRecorder
• Use xcp-profile convert command

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📦 Installation

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pip install --upgrade pyxcp
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Full Changelog

See CHANGELOG.md for detailed technical information.

v0.27.1 - CAN Padding Fix

Critical bug fix for Issue #205: CAN-FD padding corruption.

See CHANGELOG.md for full details: https://github.com/christoph2/pyxcp/blob/master/CHANGELOG.md