[Verse 1] Deep inside your microcontroller's brain Lives a map where hardware meets the code domain Every sensor, every LED light Has an address in memory's sight Zero x four zero zero eight GPIO port A is waiting at the gate Write a one to make the voltage high Memory mapped magic, watch it come alive [Chorus] Map it, mask it, shift and set the bit Memory mapped I-O, that's how hardware hits Read the register, write the control word Direct hardware access, every bit is heard Map it, mask it, shift and set the bit Memory mapped I-O, that's the perfect fit [Verse 2] Configuration registers hold the key Input mode or output, what will it be? Pull-up resistors, drive strength too All controlled by bits inside of you Status registers tell you what's real Button pressed or timer's spinning wheel Peripheral control through memory lanes Special addresses where the hardware reigns [Chorus] Map it, mask it, shift and set the bit Memory mapped I-O, that's how hardware hits Read the register, write the control word Direct hardware access, every bit is heard Map it, mask it, shift and set the bit Memory mapped I-O, that's the perfect fit [Bridge] Bit manipulation is the secret art AND with mask to clear, OR to start Shift left twice to move the data right XOR to toggle, complement to flip the light Volatile pointers keep the compiler straight Hardware changes, don't optimize away [Verse 3] Device drivers built on this foundation Register programming across the nation From Arduino to embedded cores Memory mapped I-O opens all the doors Real-time systems need this direct control Hardware abstraction takes its toll So learn the registers, learn them well Memory mapped stories they will tell [Chorus] Map it, mask it, shift and set the bit Memory mapped I-O, that's how hardware hits Read the register, write the control word Direct hardware access, every bit is heard Map it, mask it, shift and set the bit Memory mapped I-O, that's the perfect fit [Outro] When software meets the silicon below Memory mapped I-O makes the magic flow
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