Getting Started With Zephyr: Using GDB To Fix a Driver Bug

Getting Started With Zephyr: Using GDB To Fix a Driver Bug

Mohammed Billoo

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In this blog post, I show how to use GDB to debug an issue encountered with a TSL2591 light sensor driver in Zephyr. The fix was submitted and successfully incorporated into The Zephyr Project.

Summary

This blog post walks through using GDB to diagnose and fix a bug in the TSL2591 light sensor driver running under Zephyr. It shows how to reproduce the failure, step through driver code and I2C interactions with GDB, apply a minimal code fix, and submit the patch to The Zephyr Project.

Key Takeaways

Reproduce the TSL2591 driver issue on a Zephyr-enabled board and isolate the failing behavior
Use GDB (with OpenOCD or a similar debug probe) to set breakpoints, inspect variables, and step through driver code
Inspect I2C transactions and sensor register reads/writes to pinpoint protocol-level causes
Implement a minimal, correct fix in the Zephyr driver and validate it on hardware
Prepare and submit a clean patch to The Zephyr Project following the contribution workflow

Who Should Read This

Embedded firmware engineers and developers who work with Zephyr or RTOS-based sensor drivers and want practical GDB debugging and patch-submission guidance.

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