Hardware.LCD.CFA635

LCD devices

data LCD

Represents an open LCD device. Abstract.

withLCD :: FilePath -> (LCD -> IO a) -> IO a

Run an IO action with a connection to an LCD.

open :: FilePath -> IO LCD

Open the LCD at a particular device file. Maybe use withLCD instead?

close :: LCD -> IO ()

Close the LCD file. Maybe use withLCD instead?

Display parameters

contrast :: LCD -> Int -> IO ()

Set contrast. 0 is light, 254 is dark, 95 is recommended.

backlight :: LCD -> Int -> IO ()

Set backlight brightness. 0 is off, 100 is full on.

cursorStyle :: LCD -> Int -> IO ()

Set the cursor style. Valid styles are from [0..4].

Displaying text

clear :: LCD -> IO ()

Clear the screen.

data Pos

Constructors

Pos Int Int

Instances

Eq Pos

Show Pos

move :: LCD -> Pos -> IO ()

Move the cursor.

write :: LCD -> Pos -> String -> IO ()

Write to the LCD at a specified position.

Indicator LEDs

setLED :: LCD -> Int -> Bool -> IO ()

Turn on or off an indicator LED. Valid indices are from [0..7].

clearLEDs :: LCD -> IO ()

Turn off all indicator LEDs.