Interrupt Scope

A device monitor with separate lanes for timer, keyboard, mouse, UART and RTC. Independent scales keep timer traffic from obscuring other devices.

Run it

Build examples with devenv shell -- lcom-ng-build, then:

lcom-ng run -- build/examples/interrupt_scope

Controls

• Space: freeze or resume the graph. L: UART loopback.
• F1: help. C clears counters and history.

In the app

Every device has its own laneIndependently scaled lanes reveal input bursts alongside the steady timer.

Keyboard scan codesTyping produces real make and break bytes in the device inspector.

Mouse packetsThe inspector shows the three bytes of each PS/2 mouse packet.

Pause the historySpace freezes the graph while hardware counters continue to update.

Disable the serial probeL toggles COM1 loopback while the remaining devices stay live.

Start a fresh measurementC clears the counters and history, ready for the next experiment.

Learn the instrumentF1 explains rate windows, polling and loopback.

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Every device has its own lane · Independently scaled lanes reveal input bursts alongside the steady timer.

What it demonstrates

IRQ coalescing, event rates, PS/2 parsing, UART loopback, RTC polling and bounded history buffers.

Source: examples/interrupt_scope.c.

Refresh captures with the screenshot workflow.