A 7-segment display controller for the LaunchPad written in Atom.

7-segment.hs

-- http://hackage.haskell.org/package/atom
-- http://hackage.haskell.org/package/atom-msp430

module Main where

import Data.Word
import Data.Bits
import Language.Atom.MSP430

main = mspCompile "g2231" $ mspProgram {
    setupFn = Just setup,
    timerAISR = Just isr
 }

isr = do
    counter <- word8 "counter" 0
    digits <- array "digits" sevenSeg
    period 30 $ atom "write_digit" $ do
        port1Out <== digits !. value counter
        counter <== mod_ (value counter + 1) (Const 10)

sevenSeg = [0x40, 0xF3, 0x09, 0x21, 0x32, 0x24, 0x04, 0xF1, 0x00, 0x30] :: [Word8]

setup = do
    atom "settings" $ do
        watchdog <== Const (wdtPassword .|. wdtHold)
        port1Dir <== Const 0xFF
        port1Out <== Const 0xFF
        timerAControl <== Const (taUpMode .|. taSourceSMCLK .|. taSourceDiv8)
        timerACCC0 <== Const taCCRInterrupt
        timerACCR0 <== Const 4096
        call "__enable_interrupt"
    atom "poweroff" $ inline "_BIS_SR(LPM0|GIE)"

inline s = action (\_ -> s) []