mtask.class.tex

   1 In the \emph{Arduino} ecosystem, shields are available to plug into the
   2 microcontroller and add functionality. These shields range from Bluetooth,
   3 WiFi, Ethernet, LoRa, LCD screens and much more. Often the functionality
   4 available in these shields is housed in a \gls{C++} class. This functionality
   5 is ported using little work to \gls{mTask} by just creating a corresponding
   6 class with the same functions. As an example, Listing~\ref{lst:lcd} shows parts
   7 of the \gls{LCD} class as an \gls{mTask} class functions and as
   8 Listing~\ref{lst:lcdc} shown the corresponding \emph{Arduino} class functions.
   9
  10 \begin{lstlisting}[language=Clean,label={lst:lcd},%
  11         caption={Adding the \gls{LCD} to the \gls{mTask} language}]
  12 :: LCD = ...
  13
  14 class lcd v where
  15   begin       :: (v LCD Expr) (v Int p) (v Int q) -> v () Expr
  16   LCD         :: Int Int [DigitalPin] ((v LCD Expr) -> Main (v b q)) -> Main (v b q)
  17   ...
  18   scrollLeft  :: (v LCD Expr) -> v () Expr
  19   scrollRight :: (v LCD Expr) -> v () Expr
  20   ...
  21 \end{lstlisting}
  22
  23 \begin{lstlisting}[language=C++,label={lst:lcdc},%
  24         caption={Functions from the \gls{Arduino} \gls{LCD} library}]
  25 class LiquidCrystal {
  26 public:
  27   void begin(uint8_t cols, uint8_t rows);
  28   ...
  29   void scrollDisplayLeft();
  30   void scrollDisplayRight();
  31   ...
  32 }
  33 \end{lstlisting}