Module gba::bios

The GBA’s BIOS provides limited built-in utility functions.

BIOS functions are accessed with an swi instruction to perform a software interrupt. This means that there’s a significant overhead for a BIOS call (tens of cycles) compared to a normal function call (3 cycles, or even none of the function ends up inlined). Despite this higher cost, some bios functions are useful enough to justify the overhead.

Structs

BitUnpackInfo

Used to provide info to a call of the BitUnPack function.

Functions

BitUnPack^⚠

0x10: Copy data from src to dest while increasing the bit depth of the elements copied.

IntrWait

0x04: Waits for a specific interrupt type(s) to happen.

VBlankIntrWait

0x05: Builtin shorthand for IntrWait(true, IrqBits::VBLANK)