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Erik Wallin

PROFILE

Erik Wallin

Over six months, Skelpdar developed and refined hardware-software integration features for the LDMX-Software/ldmx-sw and pflib repositories, focusing on detector digitization, I2C-based device control, and data analysis workflows. He implemented robust C++ modules for HCAL digitization, ntupling of HGCROC Digis, and pulse shape storage, introducing conditional logic to distinguish real and simulated data. His work included refactoring I2C interfaces, enhancing board monitoring, and improving assertion correctness in tracking modules. Using C++, Python, and CMake, Skelpdar addressed both feature development and bug fixes, demonstrating depth in embedded systems, low-level programming, and high-energy physics data processing throughout the codebase.

Overall Statistics

Feature vs Bugs

80%Features

Repository Contributions

15Total
Bugs
2
Commits
15
Features
8
Lines of code
1,680
Activity Months6

Work History

December 2025

2 Commits • 1 Features

Dec 1, 2025

December 2025 monthly summary for LDMX-Software/pflib focused on delivering hardware-monitoring enhancements and robust DAC control via I2C. Implemented board I2C initialization to enable temperature and status monitoring, and separated Bias vs board I2C buses to improve Bias class reliability and DAC reset handling. This set of changes reduces monitoring gaps, prevents cross-bus contention, and lays groundwork for scalable sensor integration.

September 2025

2 Commits • 1 Features

Sep 1, 2025

In September 2025, delivered targeted improvements across two core LDMX repositories to enhance reliability, maintainability, and correctness in hardware interfacing and data tracking workflows. Key work included a refactor of the I2C interface in pflib with API consolidation, simplifying communication and reducing technical debt; and a correctness-focused fix in ldmx-sw’s Tracking module headers to ensure accurate assertion checks without altering functionality. These changes reduce risk in production, streamline cross-platform usage, and lay a cleaner foundation for future enhancements.

July 2025

2 Commits • 2 Features

Jul 1, 2025

Month: 2025-07 — Focused on delivering robust hardware-software integration for detector bias control and enhanced pulse shape data analysis. Delivered cross-repo features that improve calibration accuracy, data fidelity, and readiness for end-to-end validation across Pflib and ldmx-sw.

June 2025

1 Commits • 1 Features

Jun 1, 2025

Month 2025-06 summary for LDMX-Software/ldmx-sw: Delivered the NtuplizeHgcrocDigiCollection feature enabling ntupling of both real and simulated HGCROC Digis. Implemented conditional logic to differentiate data vs. simulation, ensuring simulation-specific fields default correctly when not applicable. Included formatting refinements, removal of an unused const_cast, and addition of a const header accessor to analyzers to improve usability.

March 2025

1 Commits

Mar 1, 2025

March 2025: Delivered a critical HCAL digitization reliability improvement in LDMX-Software/ldmx-sw by fixing end ID mapping for HcalDigiProducer when zero suppression is disabled. The change ensures digis are correctly attributed to the negative end ID, reducing mis-association in HCAL data across zero-suppression configurations. Implemented in commit 3aa0da097c86d38509854c14b4c687e0a4c5c96f (PR #1658). This directly strengthens data quality for downstream reconstruction and analysis, enabling more trustworthy HCAL outputs and reducing the need for reprocessing."

January 2025

7 Commits • 3 Features

Jan 1, 2025

Monthly summary for 2025-01 (LDMX-Software/ldmx-sw): Focused on delivering major HCAL digitization improvements and debugging enhancements. Key features delivered include comprehensive HCalDigiProducer digitization enhancements across all HCAL channels, including a new digitizeAllChannels flag, improved handling of noise digis, proper end-of-bar processing, and consistent digiID usage. Also implemented a rename of the channel suppression flag to zeroSuppression with default enabled to clarify behavior. Debugger integration improvements were added to ensure program arguments are correctly passed to the inferior process. Code quality improvements include applying clang-format across touched files. Major bugs fixed include correcting digitizeAllChannels behavior for single-ended readout and resolving detID vs digiID confusion on bars with unbalanced activity. These changes collectively improve data quality, reliability, and maintainability, and simplify debugging workflows. Technologies/skills demonstrated include C++ development for a high-energy physics data pipeline, version control discipline, build and debug tooling (justfile integration and debugger argument passing), and code formatting (clang-format).

Activity

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Quality Metrics

Correctness89.4%
Maintainability88.0%
Architecture87.4%
Performance81.4%
AI Usage20.0%

Skills & Technologies

Programming Languages

CC++PythonShell

Technical Skills

Build SystemC++C++ DevelopmentC++ programmingCMakeCode FormattingCode RefactoringData AnalysisDebuggingDetector SimulationDevice DriversEmbedded SystemsEvent ProcessingHardware ControlHigh Energy Physics Software

Repositories Contributed To

2 repos

Overview of all repositories you've contributed to across your timeline

LDMX-Software/ldmx-sw

Jan 2025 Sep 2025
5 Months active

Languages Used

C++PythonShell

Technical Skills

Build SystemC++C++ DevelopmentCode FormattingCode RefactoringDebugging

LDMX-Software/pflib

Jul 2025 Dec 2025
3 Months active

Languages Used

CC++

Technical Skills

CMakeEmbedded SystemsHardware ControlI2C CommunicationTest DevelopmentDevice Drivers

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