cpu

Documentation

Index

• Variables
• type CPU
  • func NewCPU(b *io.Bus, sched *scheduler.Scheduler) *CPU
  • func (c *CPU) Boot(m types.Model)
  • func (c *CPU) Frame()
• type Instruction
• type Register
• type RegisterPair
  • func (r RegisterPair) SetUint16(value uint16)
  • func (r RegisterPair) Uint16() uint16
• type Registers

Variables

var InstructionSet = [256]Instruction{}/* 256 elements not displayed */

InstructionSet holds the first 256 instructions.

var InstructionSetCB = [256]Instruction{}/* 256 elements not displayed */

InstructionSetCB is the set of instructions for the CB prefix.

Types

type CPU

type CPU struct {
	PC, SP uint16 // (P)rogram (C)ounter, (S)tack (P)ointer
	Registers

	Debug, DebugBreakpoint bool
	DoubleSpeed, Halted    bool
	// contains filtered or unexported fields
}

CPU represents the Game Boy's 8-bit CPU (sm83).

func NewCPU

func NewCPU(b *io.Bus, sched *scheduler.Scheduler) *CPU

func (*CPU) Boot

func (c *CPU) Boot(m types.Model)

Boot emulates the boot process by setting the Registers to the starting value provided by the types.Model.

func (*CPU) Frame

func (c *CPU) Frame()

Frame steps the CPU until the next frame is ready.

type Instruction

type Instruction struct {
	// contains filtered or unexported fields
}

type Register

type Register = uint8

Register represents a Register used to hold an 8-bit value.

type RegisterPair

type RegisterPair [2]*Register

RegisterPair is a pair of Registers used to address them as a 16-bit value.

func (RegisterPair) SetUint16

func (r RegisterPair) SetUint16(value uint16)

func (RegisterPair) Uint16

func (r RegisterPair) Uint16() uint16

type Registers

type Registers struct {
	A Register
	B Register
	C Register
	D Register
	E Register
	F Register
	H Register
	L Register

	BC RegisterPair
	DE RegisterPair
	HL RegisterPair
	AF RegisterPair
}

Registers represents the GB CPU registers.