Copyright	(C) 2019 Google Inc
License	BSD2 (see the file LICENSE)
Maintainer	QBayLogic B.V. <devops@qbaylogic.com>
Safe Haskell	None
Language	Haskell2010

Clash.Explicit.SimIO

Contents

I/O environment for simulation
Display on stdout
End of simulation
Mutable values
File I/O

Description

I/O actions that are translatable to HDL

Synopsis

mealyIO :: KnownDomain dom => Clock dom -> (s -> i -> SimIO o) -> SimIO s -> Signal dom i -> Signal dom o
data SimIO a
display :: String -> SimIO ()
finish :: Integer -> SimIO a
data Reg a
reg :: a -> SimIO (Reg a)
readReg :: Reg a -> SimIO a
writeReg :: Reg a -> a -> SimIO ()
data File
openFile :: FilePath -> String -> SimIO File
closeFile :: File -> SimIO ()
getChar :: File -> SimIO Char
putChar :: Char -> File -> SimIO ()
getLine :: forall n. KnownNat n => File -> Reg (Vec n (Unsigned 8)) -> SimIO Int
isEOF :: File -> SimIO Bool
flush :: File -> SimIO ()
seek :: File -> Integer -> Int -> SimIO Int
rewind :: File -> SimIO Int
tell :: File -> SimIO Integer

I/O environment for simulation

mealyIO Source #

Arguments

:: KnownDomain dom
=> Clock dom	Clock at which rate the I/O environment progresses
-> (s -> i -> SimIO o)	Transition function inside an I/O environment
-> SimIO s	I/O action to create the initial state
-> Signal dom i
-> Signal dom o

Simulation-level I/O environment that can be synthesized to HDL-level I/O. Note that it is unlikely that the HDL-level I/O can subsequently be synthesized to a circuit.

Example

tbMachine :: (File,File) -> Int -> SimIO Int
tbMachine (fileIn,fileOut) regOut = do
  eofFileOut <- isEOF fileOut
  eofFileIn  <- isEOF fileIn
  when (eofFileIn || eofFileOut) $ do
    display "success"
    finish 0

  goldenIn  <- getChar fileIn
  goldenOut <- getChar fileOut
  res <- if regOut == fromEnum goldenOut then do
           return (fromEnum goldenIn)
         else do
           display "Output doesn't match golden output"
           finish 1
  display ("Output matches golden output")
  return res

tbInit :: (File,File)
tbInit = do
  fileIn  <- openFile "./goldenInput00.txt" "r"
  fileOut <- openFile "./goldenOutput00.txt" "r"
  return (fileIn,fileOut)

topEntity :: Signal System Int
topEntity = regOut
  where
    clk = systemClockGen
    rst = resetGen
    ena = enableGen

    regOut = register clk rst ena (fromEnum 'a') regIn
    regIn  = mealyIO clk tbMachine tbInit regOut

data SimIO a Source #

Simulation-level I/O environment; synthesizable to HDL I/O, which in itself is unlikely to be synthesisable to a digital circuit.

See mealyIO as to its use.

Instances

Instances details

Monad SimIO Source #
Instance details Defined in Clash.Explicit.SimIO Methods (>>=) :: SimIO a -> (a -> SimIO b) -> SimIO b # (>>) :: SimIO a -> SimIO b -> SimIO b # return :: a -> SimIO a #
Functor SimIO Source #
Instance details Defined in Clash.Explicit.SimIO Methods fmap :: (a -> b) -> SimIO a -> SimIO b # (<$) :: a -> SimIO b -> SimIO a #
Applicative SimIO Source #
Instance details Defined in Clash.Explicit.SimIO Methods pure :: a -> SimIO a # (<>) :: SimIO (a -> b) -> SimIO a -> SimIO b # liftA2 :: (a -> b -> c) -> SimIO a -> SimIO b -> SimIO c # (>) :: SimIO a -> SimIO b -> SimIO b # (<*) :: SimIO a -> SimIO b -> SimIO a #

Display on stdout

display Source #

Arguments

:: String	String you want to display
-> SimIO ()

Display a string on stdout

End of simulation

finish Source #

Arguments

:: Integer	The exit code you want to return at the end of the simulation
-> SimIO a

Finish the simulation with an exit code

Mutable values

data Reg a Source #

Mutable reference

reg Source #

Arguments

:: a	The starting value
-> SimIO (Reg a)

Create a new mutable reference with the given starting value

readReg :: Reg a -> SimIO a Source #

Read value from a mutable reference

writeReg Source #

Arguments

:: Reg a	The mutable reference
-> a	The new value
-> SimIO ()

Write new value to the mutable reference

File I/O

data File Source #

File handle

openFile Source #

Arguments

:: FilePath

File to open

-> String

File mode:

"r": Open for reading
"w": Create for writing
"a": Append
"r+": Open for update (reading and writing)
"w+": Create for update
"a+": Append, open or create for update at end-of-file

-> SimIO File

Open a file

closeFile :: File -> SimIO () Source #

Close a file

Reading and writing characters

getChar Source #

Arguments

:: File	File to read from
-> SimIO Char

Read one character from a file

putChar Source #

Arguments

:: Char	Character to insert
-> File	Buffer to insert to
-> SimIO ()

Insert a character into a buffer specified by the file

Reading strings

getLine Source #

Arguments

:: forall n. KnownNat n
=> File	File to read from
-> Reg (Vec n (Unsigned 8))	Vector to store the content
-> SimIO Int

Read one line from a file

Detecting the end of input

isEOF Source #

Arguments

:: File	File we want to inspect
-> SimIO Bool

Determine whether we've reached the end of the file

Buffering operations

flush :: File -> SimIO () Source #

Write any buffered output to file

Repositioning handles

seek Source #

Arguments

:: File	File to set the position for
-> Integer	Position
-> Int	Mode: 0: From the beginning of the file 1: From the current position 2: From the end of the file
-> SimIO Int

Set the position of the next operation on the file

rewind :: File -> SimIO Int Source #

Set the position of the next operation to the beginning of the file

tell Source #

Arguments

:: File	File we want to inspect
-> SimIO Integer

Returns the offset from the beginning of the file (in bytes).