[Verse 1] Clock pulse ticking at a million beats per second Hardware signals pierce the main execution thread Processor halts its calculation mid-expression Saves the context, jumps to interrupt instead Stack pointer captures where we left our computation Program counter frozen at instruction twenty-three Service routine waits with microsecond patience Ready to respond to hardware's urgent plea [Chorus] ISR, ISR, interrupt service routine Save the state, handle fate, keep the timeline clean Hard deadlines, soft deadlines, real-time guarantees Priority inversion, context switch with ease ISR, ISR, microsecond precision Handle every signal with surgical decision [Verse 2] Timer overflow sends a signal to the kernel GPIO pin voltage triggers edge detection DMA controller whispers "transfer is eternal" UART buffer screams for immediate attention Nested interrupts create a complex tower Lower priority waits while urgent tasks complete Preemptive scheduling measures response power Every nanosecond counts in this digital feat [Chorus] ISR, ISR, interrupt service routine Save the state, handle fate, keep the timeline clean Hard deadlines, soft deadlines, real-time guarantees Priority inversion, context switch with ease ISR, ISR, microsecond precision Handle every signal with surgical decision [Bridge] Latency jitter makes the timeline shake Critical sections hold atomic wake Spinlock spinning while the handler's busy Watchdog timer keeps the system dizzy RTOS scheduler picks the next in queue Priority ceiling protocol pulls us through [Verse 3] Maskable interrupts can wait their proper turn Non-maskable forces immediate response Interrupt vector table helps the processor learn Which routine handles each specific wants Bottom half processing defers the heavy lifting Top half keeps the timing razor-sharp and tight Between hardware pulses, software keeps on shifting Maintaining real-time promises throughout the night [Chorus] ISR, ISR, interrupt service routine Save the state, handle fate, keep the timeline clean Hard deadlines, soft deadlines, real-time guarantees Priority inversion, context switch with ease ISR, ISR, microsecond precision Handle every signal with surgical decision [Outro] When the hardware calls, we answer every time Deterministic response in perfect paradigm
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