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Uart
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<H2>
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ioio.lib.api</FONT>
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Interface Uart</H2>
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<DL>
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<DT><B>All Superinterfaces:</B> <DD><A HREF="../../../ioio/lib/api/Closeable.html" title="interface in ioio.lib.api">Closeable</A></DD>
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<DL>
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<DT><PRE>public interface <B>Uart</B><DT>extends <A HREF="../../../ioio/lib/api/Closeable.html" title="interface in ioio.lib.api">Closeable</A></DL>
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</PRE>
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<P>
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An interface for controlling a UART module.
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<p>
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UART is a very common hardware communication protocol, enabling full- duplex,
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asynchronous point-to-point data transfer. It typically serves for opening
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consoles or as a basis for higher-level protocols, such as MIDI, RS-232 and
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RS-485. Uart instances are obtained by calling
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<CODE>IOIO#openUart(Spec, ioio.lib.api.DigitalOutput.Spec, int, Parity, StopBits)</CODE>.
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<p>
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The UART protocol is completely symmetric - there is no "master" and "slave"
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at this layer. Each end may send any number of bytes at arbitrary times,
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making it very useful for terminals and terminal-controllable devices.
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<p>
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Working with UART is very intuitive - it just provides a standard InputStream
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and/or OutputStream. Optionally, one could create a read-only or write-only
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UART instances, by passing null (or INVALID_PIN) for either TX or RX pins.
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<p>
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The instance is alive since its creation. If the connection with the IOIO
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drops at any point, the instance transitions to a disconnected state, which
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every attempt to use it (except <A HREF="../../../ioio/lib/api/Closeable.html#close()"><CODE>Closeable.close()</CODE></A>) will throw a
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<A HREF="../../../ioio/lib/api/exception/ConnectionLostException.html" title="class in ioio.lib.api.exception"><CODE>ConnectionLostException</CODE></A>. Whenever <A HREF="../../../ioio/lib/api/Closeable.html#close()"><CODE>Closeable.close()</CODE></A> is invoked the
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instance may no longer be used. Any resources associated with it are freed
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and can be reused.
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<p>
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Typical usage:
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<pre>
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Uart uart = ioio.openUart(3, 4, 19200, Parity.NONE, StopBits.ONE);
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InputStream in = uart.getInputStream();
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OutputStream out = uart.getOutputStream();
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out.write(new String("Hello").getBytes());
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int i = in.read(); // blocking
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...
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uart.close(); // free UART module and pins
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</pre>
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<P>
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<P>
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<DL>
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<DT><B>See Also:</B><DD><CODE>IOIO#openUart(Spec, ioio.lib.api.DigitalOutput.Spec, int, Parity,
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StopBits)</CODE></DL>
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<CODE>static class</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../ioio/lib/api/Uart.Parity.html" title="enum in ioio.lib.api">Uart.Parity</A></B></CODE>
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<BR>
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Parity-bit mode.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE>static class</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../ioio/lib/api/Uart.StopBits.html" title="enum in ioio.lib.api">Uart.StopBits</A></B></CODE>
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<BR>
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Number of stop-bits.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> java.io.InputStream</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../ioio/lib/api/Uart.html#getInputStream()">getInputStream</A></B>()</CODE>
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<BR>
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Gets the input stream.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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<CODE> java.io.OutputStream</CODE></FONT></TD>
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<TD><CODE><B><A HREF="../../../ioio/lib/api/Uart.html#getOutputStream()">getOutputStream</A></B>()</CODE>
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<BR>
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Gets the output stream.</TD>
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<A NAME="methods_inherited_from_class_ioio.lib.api.Closeable"><!-- --></A>
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<TH ALIGN="left"><B>Methods inherited from interface ioio.lib.api.<A HREF="../../../ioio/lib/api/Closeable.html" title="interface in ioio.lib.api">Closeable</A></B></TH>
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<TD><CODE><A HREF="../../../ioio/lib/api/Closeable.html#close()">close</A></CODE></TD>
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<A NAME="getInputStream()"><!-- --></A><H3>
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getInputStream</H3>
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<PRE>
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java.io.InputStream <B>getInputStream</B>()</PRE>
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<DL>
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<DD>Gets the input stream.
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<P>
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<DD><DL>
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</DL>
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</DD>
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<DD><DL>
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<DT><B>Returns:</B><DD>An input stream.</DL>
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<A NAME="getOutputStream()"><!-- --></A><H3>
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getOutputStream</H3>
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<PRE>
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java.io.OutputStream <B>getOutputStream</B>()</PRE>
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<DL>
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<DD>Gets the output stream.
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<P>
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<DD><DL>
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</DL>
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</DD>
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<DD><DL>
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<DT><B>Returns:</B><DD>An output stream.</DL>
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