Firmware Explained: How Your Hardware Talks to the CPU | Complete Backend Workflow #firmware

Have you ever wondered what actually happens inside your computer when you press a key on your keyboard?

Most people know that pressing "A" shows the letter A on the screen. But very few understand the complete backend journey that happens between your keyboard, firmware, motherboard, CPU, device driver, RAM, operating system, and application.

In this lecture, we dive deep into Firmware—the component often called the Soul of a Machine.

You'll learn:
• What Firmware is
• Why Firmware exists in every machine
• Why Firmware is called the Soul of a Machine
• Firmware vs Device Driver
• Microprocessor vs Microcontroller
• Electronic Circuit Workflow
• Keyboard Communication Architecture
• Interrupt Requests (IRQ)
• Memory Mapped I/O (MMIO)
• Interrupt Service Routine (ISR)
• Device Driver Processing
• RAM Interaction
• Windows Input Stack
• Linux evdev
• How a keyboard key becomes a character on your screen

Timestamps:
00:00 Introduction
00:50 Why Operating Systems Cannot Directly Control Hardware
01:30 The Missing Component Between Hardware and Software
02:00 What Is Firmware?
02:35 Electronic Circuits Inside Hardware Devices
02:55 MicroProcessor vs MicroController in realtime operations
03:20 Why Microcontrollers Are Mini Computers
03:27 Backend Operation with Example
03:45 Creation of Electronic Circuit Loop
04:17 Decode of Signal to Hexacode and creation of data package
04:34 Initialization of Interrupt Request
04:55 Memory Mapped IO
05:12 Interrupt Service Routine
05:30 Device Drivers Workflow
06:03 OS Input Subsystem
06:38 Conclusion/Summary

CPU Registers: https://youtube.com/shorts/y0Z2ew-Oo7o
MIMO:
Interrupt Service Routine:
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#firmware #ComputerArchitecture #OperatingSystem #EmbeddedSystems #mircocontroller #microprocessor #interruptserviceroutine #cpuregisters

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