[Verse 1] When hardware calls out in the night Microseconds matter, timing's tight A signal fires, the CPU must pause Drop everything for interrupt's cause Save the context, store the state Real-time systems cannot wait [Chorus] Interrupt, respond, return with speed ISR keeps the system's heartbeat's need Priority high, latency low Hardware events must steal the show Interrupt, respond, never delay Hard deadlines rule the real-time way [Verse 2] Nested calls can stack up high But watchdog timers never lie Atomic sections guard the code While interrupts queue up in mode Preemption strikes when priorities clash Critical sections make or crash [Chorus] Interrupt, respond, return with speed ISR keeps the system's heartbeat's need Priority high, latency low Hardware events must steal the show Interrupt, respond, never delay Hard deadlines rule the real-time way [Bridge] Jitter's the enemy of precise control Deterministic paths achieve the goal Disable interrupts when data's shared Race conditions leave systems impaired Poll or interrupt, choose your fight Real-time means getting timing right [Verse 3] Vector tables point the way To service routines that save the day Edge triggered or level high Hardware flags that never lie RTOS schedules tasks with care But interrupts still take their share [Chorus] Interrupt, respond, return with speed ISR keeps the system's heartbeat's need Priority high, latency low Hardware events must steal the show Interrupt, respond, never delay Hard deadlines rule the real-time way [Outro] When microseconds count each beat Hardware and software must meet Interrupt handling, precise and clean Real-time response, the ultimate machine
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