trezor/trezor-firmware
Dec 2024 – Mar 2026
13 Months active
Languages Used
CMarkdownYAMLpythonPythonRustSConscriptSConstruct
Technical Skills
ARM Cortex-MDocumentationEmbedded SystemsFirmware DevelopmentHardware InteractionI2C Communication
kopecdav
PROFILE
Kopecdav
David Kopecky developed and maintained core embedded firmware for the trezor/trezor-firmware repository, delivering 67 features and resolving 24 bugs over 13 months. He engineered robust power and battery management subsystems, integrating Kalman filter-based state estimation and advanced telemetry for real-time diagnostics. His work included modular driver development, refactoring for maintainability, and automation of production testing using C and Python. David enhanced hardware interaction through features like temperature-aware charging, haptic feedback control, and RTC-based scheduling, while improving reliability and observability. His technical depth is reflected in system-level refactors, unified APIs, and disciplined integration of testing frameworks and CI/CD pipelines.
Overall Statistics
Feature vs Bugs
74%Features
Repository Contributions
169Total
Bugs
24
Commits
169
Features
67
Lines of code
92,490
Activity Months13
Your Network
52 peopleWork History
March 2026
1 Commits • 1 Features
Mar 1, 2026March 2026: Delivered a firmware-level enhancement in trezor-firmware by adding an optional amplitude argument to the Haptic Test Command, enabling finer-grained testing of haptic feedback and faster QA cycles. This feature is implemented in the core/prodtest path and includes a changelog update (commit 4900b36ab16e4be3a2152dc90f93aceeef79f4e2). No separate bugs were documented in this scope; the work improves testing coverage, reduces debugging time, and supports faster, higher-quality releases. Technologies demonstrated: firmware development (C), haptic subsystem control, prodtest tooling, and disciplined release documentation.
1 Commits • 1 Features
Mar 1, 2026March 2026: Delivered a firmware-level enhancement in trezor-firmware by adding an optional amplitude argument to the Haptic Test Command, enabling finer-grained testing of haptic feedback and faster QA cycles. This feature is implemented in the core/prodtest path and includes a changelog update (commit 4900b36ab16e4be3a2152dc90f93aceeef79f4e2). No separate bugs were documented in this scope; the work improves testing coverage, reduces debugging time, and supports faster, higher-quality releases. Technologies demonstrated: firmware development (C), haptic subsystem control, prodtest tooling, and disciplined release documentation.
March 2026
January 2026
14 Commits • 3 Features
Jan 1, 2026January 2026 (trezor/trezor-firmware) focused on reliability, observability, and hardware interaction improvements across core subsystems. Major architectural refactors and new telemetry allowed proactive maintenance and faster diagnostics, while hands-on enhancements to haptics and battery management improved user experience and product quality. Key achievements: - Implemented modular error handling by moving the error module into trezor_types and introducing a new TS_ENOINIT error code to improve initialization diagnostics and debugging. - Reworked haptic driver for T3W1 to drv262x, fixed configuration (open/close loop), added waveform playback, expanded actuator control, and strengthened error handling; aligned tests for robustness. - Overhauled battery management with a unified API, introduced battery cycle counter, expanded telemetry (cycles, battery_cycle), and added Unix telemetry support; extended prodtest and telemetry tooling to reflect these changes. Impact and business value: - Improved initialization reliability and root-cause diagnosability with a standardized error code, reducing mean time to resolution. - Enhanced haptic fidelity and reliability on hardware sensitive interactions, improving user engagement. - Richer power management telemetry enables proactive maintenance, lowers field failures, and supports data-driven product decisions. Technologies/skills demonstrated: - Systems-level refactoring, error handling architecture, and driver modernization. - Telemetry, protobuf schema updates, and Unix-based telemetry integration. - Test robustness and cross-component integration across firmware, prodtest, and tooling.
January 2026
14 Commits • 3 Features
Jan 1, 2026January 2026 (trezor/trezor-firmware) focused on reliability, observability, and hardware interaction improvements across core subsystems. Major architectural refactors and new telemetry allowed proactive maintenance and faster diagnostics, while hands-on enhancements to haptics and battery management improved user experience and product quality. Key achievements: - Implemented modular error handling by moving the error module into trezor_types and introducing a new TS_ENOINIT error code to improve initialization diagnostics and debugging. - Reworked haptic driver for T3W1 to drv262x, fixed configuration (open/close loop), added waveform playback, expanded actuator control, and strengthened error handling; aligned tests for robustness. - Overhauled battery management with a unified API, introduced battery cycle counter, expanded telemetry (cycles, battery_cycle), and added Unix telemetry support; extended prodtest and telemetry tooling to reflect these changes. Impact and business value: - Improved initialization reliability and root-cause diagnosability with a standardized error code, reducing mean time to resolution. - Enhanced haptic fidelity and reliability on hardware sensitive interactions, improving user engagement. - Richer power management telemetry enables proactive maintenance, lowers field failures, and supports data-driven product decisions. Technologies/skills demonstrated: - Systems-level refactoring, error handling architecture, and driver modernization. - Telemetry, protobuf schema updates, and Unix-based telemetry integration. - Test robustness and cross-component integration across firmware, prodtest, and tooling.
November 2025
7 Commits • 3 Features
Nov 1, 2025Month 2025-11 — Key firmware work in trezor-firmware focused on power management, RTC scheduling, OPTIGA driver robustness, and prodtest UI tuning. Delivered an RTC-based event scheduler, hardened power manager RTC scheduling and clearer PM_TIMEOUT signaling; implemented OPTIGA suspend/resume with updated initialization, ensuring OPTIGA remains powered during critical states, and tuned prodtest backlight for better usability. These changes improve reliability during power state transitions, strengthen security element handling, and enhance production/testing visibility.
7 Commits • 3 Features
Nov 1, 2025Month 2025-11 — Key firmware work in trezor-firmware focused on power management, RTC scheduling, OPTIGA driver robustness, and prodtest UI tuning. Delivered an RTC-based event scheduler, hardened power manager RTC scheduling and clearer PM_TIMEOUT signaling; implemented OPTIGA suspend/resume with updated initialization, ensuring OPTIGA remains powered during critical states, and tuned prodtest backlight for better usability. These changes improve reliability during power state transitions, strengthen security element handling, and enhance production/testing visibility.
November 2025
October 2025
6 Commits • 2 Features
Oct 1, 20252025-10 monthly summary for trezor-firmware: Delivered key power management and battery model enhancements, plus initialization cleanup to improve reliability. Changes emphasize reliability, performance, and maintainability with concrete commits that enhance resume stability, expand battery support, and clean initialization dependencies.
October 2025
6 Commits • 2 Features
Oct 1, 20252025-10 monthly summary for trezor-firmware: Delivered key power management and battery model enhancements, plus initialization cleanup to improve reliability. Changes emphasize reliability, performance, and maintainability with concrete commits that enhance resume stability, expand battery support, and clean initialization dependencies.
September 2025
19 Commits • 3 Features
Sep 1, 2025September 2025 highlights: Delivered core power-management and UX improvements for trezor-firmware, including suspend/resume handling for RGB LED, charging status API, wake-on-USB behavior, and related power-manager refinements; refactored bootloader UI for correct multi-line label rendering; added a red LED indicator to the wipe flow for clearer user feedback; updated BLE test binaries to current versions to improve test fidelity. These changes enhance device reliability, reduce idle power, and improve user experience and testing robustness.
19 Commits • 3 Features
Sep 1, 2025September 2025 highlights: Delivered core power-management and UX improvements for trezor-firmware, including suspend/resume handling for RGB LED, charging status API, wake-on-USB behavior, and related power-manager refinements; refactored bootloader UI for correct multi-line label rendering; added a red LED indicator to the wipe flow for clearer user feedback; updated BLE test binaries to current versions to improve test fidelity. These changes enhance device reliability, reduce idle power, and improve user experience and testing robustness.
September 2025
August 2025
22 Commits • 10 Features
Aug 1, 2025August 2025 firmware delivery for trezor/trezor-firmware focused on reliability, performance, and hardware feedback improvements. Key features delivered include: advanced battery modeling with separate charging/discharging temperature profiles and fully characterized data; tuned fuel gauge EKF parameters for higher accuracy; expanded RGB LED driver with effects, prodtest support, cycle limiting, and higher color resolution; backlight level aligned with design guidelines; new LED effects for hibernation charging and bootloader pairing; codebase improvements moving RGB_LED pin definitions to model files and adding ongoing effect/type APIs. Major stability fixes address wakeup flag handling after background task resume, unified core power manager timings, kernel mode handling and dependency resolution, and a battery model bug fix. Overall impact includes improved power prediction, reduced risk of miswake events, richer user-visible LED feedback, and strengthened maintainability. Demonstrated technologies/skills include embedded firmware development, sensor/power modeling, EKF tuning, LED driver design, prodtest integration, Unix stubs, and code refactoring for maintainability.
August 2025
22 Commits • 10 Features
Aug 1, 2025August 2025 firmware delivery for trezor/trezor-firmware focused on reliability, performance, and hardware feedback improvements. Key features delivered include: advanced battery modeling with separate charging/discharging temperature profiles and fully characterized data; tuned fuel gauge EKF parameters for higher accuracy; expanded RGB LED driver with effects, prodtest support, cycle limiting, and higher color resolution; backlight level aligned with design guidelines; new LED effects for hibernation charging and bootloader pairing; codebase improvements moving RGB_LED pin definitions to model files and adding ongoing effect/type APIs. Major stability fixes address wakeup flag handling after background task resume, unified core power manager timings, kernel mode handling and dependency resolution, and a battery model bug fix. Overall impact includes improved power prediction, reduced risk of miswake events, richer user-visible LED feedback, and strengthened maintainability. Demonstrated technologies/skills include embedded firmware development, sensor/power modeling, EKF tuning, LED driver design, prodtest integration, Unix stubs, and code refactoring for maintainability.
July 2025
11 Commits • 7 Features
Jul 1, 2025July 2025 summary for trezor-firmware: Implemented temperature-aware charge control and robust power-management improvements, cleaned up code quality in battery-related tools, fixed critical race-condition and timing issues, and prepared battery-model aware SoC targeting. These changes deliver safer charging, more reliable power transitions, and clearer APIs, enabling faster development cycles and reduced field-risk.
11 Commits • 7 Features
Jul 1, 2025July 2025 summary for trezor-firmware: Implemented temperature-aware charge control and robust power-management improvements, cleaned up code quality in battery-related tools, fixed critical race-condition and timing issues, and prepared battery-model aware SoC targeting. These changes deliver safer charging, more reliable power transitions, and clearer APIs, enabling faster development cycles and reduced field-risk.
July 2025
June 2025
17 Commits • 8 Features
Jun 1, 2025June 2025 highlights for trezor-firmware: key battery management enhancements, robust automated testing, and charging reliability improvements, delivering measurable business value and safer hardware operation. Highlights include refined battery model, fuel gauge configuration, and SOC handling with Kalman-filter tuning; automated battery tester framework with Deditec integration; wireless charging behavior updated to apply direct max current on connect; new production-test SoC estimation command; and RTC timestamp support with related diagnostic commands.
June 2025
17 Commits • 8 Features
Jun 1, 2025June 2025 highlights for trezor-firmware: key battery management enhancements, robust automated testing, and charging reliability improvements, delivering measurable business value and safer hardware operation. Highlights include refined battery model, fuel gauge configuration, and SOC handling with Kalman-filter tuning; automated battery tester framework with Deditec integration; wireless charging behavior updated to apply direct max current on connect; new production-test SoC estimation command; and RTC timestamp support with related diagnostic commands.
May 2025
24 Commits • 9 Features
May 1, 2025May 2025 Monthly Summary: Power management refactor and reliability enhancements delivered across the trezor-firmware stack, with a strong focus on safety, observability, and testability. The changes reduce architectural debt, improve fault tolerance, and provide clearer interfaces for applications and production validation.
24 Commits • 9 Features
May 1, 2025May 2025 Monthly Summary: Power management refactor and reliability enhancements delivered across the trezor-firmware stack, with a strong focus on safety, observability, and testability. The changes reduce architectural debt, improve fault tolerance, and provide clearer interfaces for applications and production validation.
May 2025
April 2025
35 Commits • 13 Features
Apr 1, 2025April 2025 highlights for trezor-firmware: delivered foundational power and energy management capabilities, hardened data retention, and enhanced testability. Core work established a battery-centric foundation across fuel gauge and power management, expanded testability via prodtest, and introduced robust storage and charging controls to improve reliability and field performance.
April 2025
35 Commits • 13 Features
Apr 1, 2025April 2025 highlights for trezor-firmware: delivered foundational power and energy management capabilities, hardened data retention, and enhanced testability. Core work established a battery-centric foundation across fuel gauge and power management, expanded testability via prodtest, and introduced robust storage and charging controls to improve reliability and field performance.
February 2025
5 Commits • 3 Features
Feb 1, 2025February 2025 (Month: 2025-02): Delivered critical enhancements to the prodtest CLI, introduced a unit testing framework for the prodtest environment, and completed essential maintenance to improve stability and code quality. The changes enable more robust testing workflows, clearer runtime logs, and reduced build friction. Collectively, these efforts improved NFC reliability, developer efficiency, and overall product quality.
5 Commits • 3 Features
Feb 1, 2025February 2025 (Month: 2025-02): Delivered critical enhancements to the prodtest CLI, introduced a unit testing framework for the prodtest environment, and completed essential maintenance to improve stability and code quality. The changes enable more robust testing workflows, clearer runtime logs, and reduced build friction. Collectively, these efforts improved NFC reliability, developer efficiency, and overall product quality.
February 2025
January 2025
6 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for trezor-firmware focusing on maintainability, build reliability, and NFC feature groundwork. Delivered targeted refactors and groundwork across core prodtest and NFC modules, setting the stage for future feature delivery and faster release cycles. Improvements include a module refactor and build integration for the STWLC38 patching flow, code formatting hygiene, NFC integration scaffolding with RFAL/NDEF support, and a fix to ensure builds remain stable by adding a missing source file for revA0.
January 2025
6 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for trezor-firmware focusing on maintainability, build reliability, and NFC feature groundwork. Delivered targeted refactors and groundwork across core prodtest and NFC modules, setting the stage for future feature delivery and faster release cycles. Improvements include a module refactor and build integration for the STWLC38 patching flow, code formatting hygiene, NFC integration scaffolding with RFAL/NDEF support, and a fix to ensure builds remain stable by adding a missing source file for revA0.
December 2024
2 Commits • 2 Features
Dec 1, 2024In December 2024, the firmware team delivered two key features and advanced build readiness, strengthening deployment capabilities and developer onboarding. Key features include host-initiated firmware and configuration updates for STWLC38, with new production-test interface commands to start updates and fetch chip information, and inclusion of NVM data for the update flow. In addition, developer-build guidance was expanded to support the DISC2 evaluation board and TrustZone security features, featuring updated embedded build instructions, new DISC2/TrustZone documentation, and adjustments to tooling (nix-shell) to reflect newer Trezor models. These efforts improve deployment reliability, security posture, and developer efficiency.
2 Commits • 2 Features
Dec 1, 2024In December 2024, the firmware team delivered two key features and advanced build readiness, strengthening deployment capabilities and developer onboarding. Key features include host-initiated firmware and configuration updates for STWLC38, with new production-test interface commands to start updates and fetch chip information, and inclusion of NVM data for the update flow. In addition, developer-build guidance was expanded to support the DISC2 evaluation board and TrustZone security features, featuring updated embedded build instructions, new DISC2/TrustZone documentation, and adjustments to tooling (nix-shell) to reflect newer Trezor models. These efforts improve deployment reliability, security posture, and developer efficiency.
December 2024
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Quality Metrics
Correctness89.2%
Maintainability88.2%
Architecture85.2%
Performance81.6%
AI Usage20.6%
Skills & Technologies
Programming Languages
CMarkdownNoneProtoBufPythonRustSConscriptSConstructYAMLpython
Technical Skills
API DesignARM Cortex-MAutomationBattery ManagementBluetooth Low EnergyBuild System ConfigurationBuild SystemsC ProgrammingC programmingCI/CD ConfigurationCode CleanupCode FormattingCode RefactoringCommand Line InterfaceCommand Line Interface (CLI)
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