3 Tips for Speeding Up Interrupt Handlers
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Embedded software frameworks often prioritize portability over performance, leading to bloated interrupt service routines (ISRs). Three practical tips are presented to reduce ISR execution time: (1) inline functions called within ISRs to eliminate function call overhead, (2) replace generic framework ISR handlers with customized, stripped-down implementations, and (3) rewrite vendor example callback code that performs unnecessary computation inside the ISR. Using a GPIO toggle and oscilloscope as a measurement baseline, these techniques reduced an input capture ISR from 24.4 µs down to 7.472 µs — less than a third of the original execution time.
