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On many microcontrolers you can use \textbf{G}eneral \textbf{P}urpose \textbf{I}nput \textbf{O}utput, in order to provide a standart access to this device you have to
implement the folowing functions:
\begin{itemize}
\item gpio\_t \textbf{gpioopen}(int);
\item\textbf{gpioclose}(gpio\_t);
\item\textbf{gpiosetdir}(gpio\_t,char);
\item\textbf{gpiosetouttype}(gpio\_t, char);
\item\textbf{gpioset}(gpio\_t,char);
\item\textbf{gpioclr}(gpio\_t,char);
\item char \textbf{gpiogetval}(gpio\_t);
\end{itemize}
\subsection{Details}
\subsubsection{\textbf{Openning gpio}}
gpio\_t \textbf{gpioopen}(int); \\
This function has to open N\ieme\textbf{ uart} device, so it has to perform basical configuration such as powering up the device \dots This finction has also to return the pointer to the devicce handle.
