5 best practices for writing interrupt service routines
Interrupt Service Routines (ISRs) are crucial for embedded systems, but poorly designed ISRs can cause race conditions, slow response times, and high CPU usage.
To create effective ISRs, keep them brief and efficient to minimize CPU cycles and avoid timing issues. Avoid calling functions within ISRs to reduce execution time and maintain stability. Use static compilation, preprocessors, and inline functions to optimize ISR code while preserving modularity.
Delegate heavy tasks to other threads using flags, queues, and proper synchronization for efficient and responsive ISRs. Declare shared variables as volatile to prevent compiler optimizations that could cause unpredictable behavior. Customize default ISR handlers to set diagnostic flags instead of entering infinite loops to handle unexpected interrupts safely. Following these practices improves the performance and reliability of embedded systems.
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