Andrii Shylenko’s LabWired is an MIT-licensed MCU firmware simulation core that runs compiled firmware against modeled CPUs and peripherals, captures UART and bus output, register state, and supports repeatable checks in CI. The simulator works on Arm Cortex-M0+, Cortex-M3, Cortex-M4, Cortex-M7, Cortex-M33 cores, RISC-V architecutre, and Xtensa LX6 and LX7 (some ESP32 parts). The main benefit of the project is speeding up firmware testing since doing some on real boards is slow. The hardware must be ready, then the firmware must be flashed to the board each time you want to test it, and if something breaks, developers get a dark LED and no trace. If a firmware project needs to support multiple boards, this quickly adds up. The project is different from a CPU/MCU emulator for two main reasons: The full board is modeled, not only the chip. Sensors, displays, and bus devices are also simulated. So you can [...]
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