Changelog

All notable changes to the AddVantage PPG firmware and tools.

[3.4.0] - 08/01/2026

Added

• Sphinx documentation system - Full API docs for firmware and test tools

  • Doxygen/Breathe integration for C code documentation

  • Autodoc for Python test harness modules

  • User guides: CAN protocol, flash layout, telemetry, testing

  • Known issues tracking

• Cloudflare Pages deployment - Auto-deploy docs to acu.mikeayles.com

• CMake docs target - ninja docs to build documentation

Changed

• Documentation now hosted externally instead of in-repo markdown

[3.2.7] - 07/01/2026

Fixed

• Boot loop issue - Fixed watchdog timeout during C runtime initialization

  • Added custom reset handler (startup_wdog.S) that disables WDOG within 256 bus cycles

  • Device no longer boot loops after flashing

Added

• Test harness boot loop detection - Detects firmware that’s stuck in reset cycle

  • Counts version strings (>3 indicates boot loop)

  • Verifies 10+ telemetry lines received (proves stable operation)

• CAN bus validation - Compare CAN data to ECU telemetry

  • Statistical comparison (mean, stddev) over 10 second window

  • Configurable tolerance (default 10%)

• Real-time CAN viewer GUI - tools/can_viewer.py

  • Gauge widgets for RPM, Torque, Temperature

  • Time series graphs with ECU overlay

  • Side-by-side CAN vs ECU comparison

Changed

• CMake build system - Now the recommended build method

  • Vendored SDK dependencies (no CodeWarrior required)

  • Cross-platform (macOS, Linux, Windows)

• Variables API refactored - Cleaner shared variable interface

[3.2.6] - 2025

Added

• Version string in boot telemetry (V3.2.6 suffix)

• Semantic versioning format in boot banner

Fixed

• Telemetry parsing for extended fields

[3.2.5] - 2023

Added

• Temperature correction map (100 points, 1°C resolution)

• Differential pressure compensation

Changed

• Fuel map resolution increased to 16x16

[3.2.0] - 2023

Added

• J1939 CAN bus support

  • EEC1 (RPM, Torque)

  • ET1 (Coolant Temperature)

  • LFE (Fuel Economy)

• Multiple fuel map support (4 maps)

• EEPROM emulation in flash

Changed

• Migrated from ProcessorExpert SCI to MSCAN driver

• Updated baud rate handling

[3.1.x] - 2022

Added

• VT100 terminal display mode

• Password protection for configuration

• Engine profile presets (1-18)

Fixed

• ADC sampling stability

• Serial output buffering

[3.0.0] - 2022

Added

• Initial SKEAZ128 port

• Basic PPG control

• UART telemetry output

• Flash configuration storage

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Version Numbering

Format: MAJOR.MINOR.PATCH

• MAJOR - Hardware platform changes

• MINOR - Feature additions

• PATCH - Bug fixes, minor improvements

Upgrade Notes

From 3.2.6 to 3.2.7

No configuration changes required. The watchdog fix is transparent.

Build Change: Use CMake instead of CodeWarrior:

mkdir build && cd build
cmake -G Ninja -DCMAKE_TOOLCHAIN_FILE=../arm-gcc-toolchain.cmake ..
ninja

From 3.1.x to 3.2.x

Configuration flash layout changed. Run factory reset (f command) after upgrade.

From 3.0.x to 3.1.x

Compatible upgrade. No changes required.