棋子 · 2020年02月10日

Debugger-based Firmware Test Framework

I'm currently working on a Python-based framework for on-target firmware testing of firmware of Cortex-M MCU systems. The approach is heavily based on the use of the debug probe to perform unit as well as system tests.

The framework I have in mind allows us to do

firmware testing without modifications for testing (i.e., not test code compiled into the firmware)
firmware component testing without mocking of, e.g., peripherals
firmware testing with selective injection of data into the execution
firmware testing on the original target device
firmware testing using the original compiler
The tests themselves are implemented in Python and are executed on a host PC which also gives you full accesses to whatever equipment you already have available for providing external test stimuli or performing measurements.

I would like to learn what approaches you are taking for firmware testing and I would like to hear your opinion on the proposed approach. If things work out well, we plan to release the framework on GitHub later this spring.

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极术小姐姐 · 2020年02月10日

Though not complete firmware, but our RTOS is tested on target using various debug probes (depending on the CPU) using the respective API. But we build test executables and use the debug probes for downloading/flashing and retrieving test results. So we need only a minimum feature.

For code coverage we rely on either Lauterbach or IAR simulator.

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