Safe Haskell	None
Language	Haskell2010

Nes.CPU.State

Contents

State
Accessing registers
Accessing status flags
Lenses

Synopsis

data CPUState = MkCPUState {
- _registerA :: !Byte
- _registerX :: !Byte
- _registerY :: !Byte
- _registerS :: !Byte
- _status :: !StatusRegister
- _pc :: !Addr
}
newCPUState :: CPUState
data Register
- = A
- | X
- | Y
- | S
register :: Register -> Lens' CPUState Byte
newtype StatusRegister = MkSR {
- unSR :: Byte
}
data StatusRegisterFlag
- = Carry
- | Zero
- | InterruptDisable
- | DecimalMode
- | BFlag
- | Unusued
- | Overflow
- | Negative
registerA :: Lens' CPUState Byte
registerX :: Lens' CPUState Byte
registerY :: Lens' CPUState Byte
registerS :: Lens' CPUState Byte
status :: Lens' CPUState StatusRegister
pc :: Lens' CPUState Addr

State

data CPUState Source #

Offset in the vram of the next instruction to execute

State of the CPU

Constructors

MkCPUState
Fields _registerA :: !Byte Aka Accumulator _registerX :: !Byte _registerY :: !Byte _registerS :: !Byte Aka Stack pointer _status :: !StatusRegister _pc :: !Addr Program counter

Instances

Instances details

Show CPUState Source #
Instance details Defined in Nes.CPU.State Methods showsPrec :: Int -> CPUState -> ShowS # show :: CPUState -> String # showList :: [CPUState] -> ShowS #
Eq CPUState Source #
Instance details Defined in Nes.CPU.State Methods (==) :: CPUState -> CPUState -> Bool # (/=) :: CPUState -> CPUState -> Bool #
MonadState CPUState (CPU r) Source #
Instance details Defined in Nes.CPU.Monad Methods get :: CPU r CPUState Source # set :: CPUState -> CPU r () Source #

newCPUState :: CPUState Source #

Get a brand new, clear CPU

Note: the PC will have to be set by reading value at programLocation

Accessing registers

data Register Source #

Enumeration of the CPU's registers

Constructors

A
X
Y
S

Instances

Instances details

Show Register Source #
Instance details Defined in Nes.CPU.State Methods showsPrec :: Int -> Register -> ShowS # show :: Register -> String # showList :: [Register] -> ShowS #
Eq Register Source #
Instance details Defined in Nes.CPU.State Methods (==) :: Register -> Register -> Bool # (/=) :: Register -> Register -> Bool #

register :: Register -> Lens' CPUState Byte Source #

Accessing status flags

newtype StatusRegister Source #

Constructors

MkSR
Fields unSR :: Byte

Instances

Instances details

Show StatusRegister Source #

Instance details

Defined in Nes.CPU.State

Methods

showsPrec :: Int -> StatusRegister -> ShowS #

show :: StatusRegister -> String #

showList :: [StatusRegister] -> ShowS #

FlagRegister StatusRegister Source #

Instance details

Defined in Nes.CPU.State

Associated Types

type Flag StatusRegister
Instance details Defined in Nes.CPU.State type Flag StatusRegister = StatusRegisterFlag

Methods

fromByte :: Byte -> StatusRegister Source #

toByte :: StatusRegister -> Byte Source #

flagToBitOffset :: Flag StatusRegister -> Int Source #

Eq StatusRegister Source #

Instance details

Defined in Nes.CPU.State

Methods

(==) :: StatusRegister -> StatusRegister -> Bool #

(/=) :: StatusRegister -> StatusRegister -> Bool #

type Flag StatusRegister Source #

Instance details

Defined in Nes.CPU.State

type Flag StatusRegister = StatusRegisterFlag

data StatusRegisterFlag Source #

Flags for the CPU's status

https://www.nesdev.org/obelisk-6502-guide/registers.html#C

Constructors

Carry
Zero
InterruptDisable
DecimalMode
BFlag
Unusued
Overflow
Negative

Instances

Instances details

Enum StatusRegisterFlag Source #
Instance details Defined in Nes.CPU.State Methods succ :: StatusRegisterFlag -> StatusRegisterFlag # pred :: StatusRegisterFlag -> StatusRegisterFlag # toEnum :: Int -> StatusRegisterFlag # fromEnum :: StatusRegisterFlag -> Int # enumFrom :: StatusRegisterFlag -> [StatusRegisterFlag] # enumFromThen :: StatusRegisterFlag -> StatusRegisterFlag -> [StatusRegisterFlag] # enumFromTo :: StatusRegisterFlag -> StatusRegisterFlag -> [StatusRegisterFlag] # enumFromThenTo :: StatusRegisterFlag -> StatusRegisterFlag -> StatusRegisterFlag -> [StatusRegisterFlag] #
Show StatusRegisterFlag Source #
Instance details Defined in Nes.CPU.State Methods showsPrec :: Int -> StatusRegisterFlag -> ShowS # show :: StatusRegisterFlag -> String # showList :: [StatusRegisterFlag] -> ShowS #
Eq StatusRegisterFlag Source #
Instance details Defined in Nes.CPU.State Methods (==) :: StatusRegisterFlag -> StatusRegisterFlag -> Bool # (/=) :: StatusRegisterFlag -> StatusRegisterFlag -> Bool #

Lenses

registerA :: Lens' CPUState Byte Source #

registerX :: Lens' CPUState Byte Source #

registerY :: Lens' CPUState Byte Source #

registerS :: Lens' CPUState Byte Source #

status :: Lens' CPUState StatusRegister Source #

pc :: Lens' CPUState Addr Source #