FPBInject

Injects code onto a running ARM Cortex-M chip without reflashing or a debugger.

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FPBInject is a free, open-source runtime code injection tool for ARM Cortex-M microcontrollers, using the chip's Flash Patch and Breakpoint hardware unit to redirect a function call to custom code in RAM over a serial connection, with no reflashing, debugger, or downtime required. It's aimed at embedded engineers who want to test or patch firmware on a running device without the usual reflash-and-restart cycle.

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