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Joel Filho Modern C++ & Embedded Systems Home Archives Twitter GitHub June 28, 2021 ISR Contexts in Embedded C and C++ — Selecting the correct function at compile time Interrupt handling is an important part of embedded systems development: it allows separating application logic from peripheral interfacing, while removing the need for polling and allowing real-time operations of peripherals. With interrupt handling in mind, the library may add functionality that requires different implementation while inside an interrupt context. Alternatively, a library function may require checks and calls when running outside an interrupt. The rule of thumb for interrupt handling is the faster, the better . This usually rules out automatic context detection at runtime . So, library writers generate two versions of the same function, optimizing for the context where they’re executed. One example of an API that extensively uses of this technique is FreeRTOS’s API . We can take its Timer API as an |
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