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<title>Sensor Watch: UART</title>
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   <div id="projectname">Sensor Watch<span id="projectnumber">&#160;0.0.1</span>
   </div>
   <div id="projectbrief">A board replacement for the classic Casio F-91W wristwatch, powered by a Microchip SAM L22 microcontroller.</div>
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<div class="header">
  <div class="summary">
<a href="#func-members">Functions</a>  </div>
  <div class="headertitle"><div class="title">UART</div></div>
</div><!--header-->
<div class="contents">

<p>This section covers functions related to the UART peripheral.  
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga38e750d3e02939bf056fde77f4ef6235"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__uart.html#ga38e750d3e02939bf056fde77f4ef6235">watch_enable_uart</a> (const uint8_t tx_pin, const uint8_t rx_pin, uint32_t baud)</td></tr>
<tr class="memdesc:ga38e750d3e02939bf056fde77f4ef6235"><td class="mdescLeft">&#160;</td><td class="mdescRight">Initializes the debug UART.  <a href="group__uart.html#ga38e750d3e02939bf056fde77f4ef6235">More...</a><br /></td></tr>
<tr class="separator:ga38e750d3e02939bf056fde77f4ef6235"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga5d62683298c511f24adaab4bf6615c50"><td class="memItemLeft" align="right" valign="top">void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__uart.html#ga5d62683298c511f24adaab4bf6615c50">watch_uart_puts</a> (char *s)</td></tr>
<tr class="memdesc:ga5d62683298c511f24adaab4bf6615c50"><td class="mdescLeft">&#160;</td><td class="mdescRight">Transmits a string of bytes on the UART's TX pin.  <a href="group__uart.html#ga5d62683298c511f24adaab4bf6615c50">More...</a><br /></td></tr>
<tr class="separator:ga5d62683298c511f24adaab4bf6615c50"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga0c400bfcd52bb71e8de62c5ab2373db6"><td class="memItemLeft" align="right" valign="top">char&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__uart.html#ga0c400bfcd52bb71e8de62c5ab2373db6">watch_uart_getc</a> (void)</td></tr>
<tr class="memdesc:ga0c400bfcd52bb71e8de62c5ab2373db6"><td class="mdescLeft">&#160;</td><td class="mdescRight">Receives a single byte from the UART's RX pin.  <a href="group__uart.html#ga0c400bfcd52bb71e8de62c5ab2373db6">More...</a><br /></td></tr>
<tr class="separator:ga0c400bfcd52bb71e8de62c5ab2373db6"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p >This section covers functions related to the UART peripheral. </p>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga38e750d3e02939bf056fde77f4ef6235" name="ga38e750d3e02939bf056fde77f4ef6235"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga38e750d3e02939bf056fde77f4ef6235">&#9670;&nbsp;</a></span>watch_enable_uart()</h2>

<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">void watch_enable_uart </td>
          <td>(</td>
          <td class="paramtype">const uint8_t&#160;</td>
          <td class="paramname"><em>tx_pin</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">const uint8_t&#160;</td>
          <td class="paramname"><em>rx_pin</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint32_t&#160;</td>
          <td class="paramname"><em>baud</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Initializes the debug UART. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">tx_pin</td><td>The pin the watch will use to transmit, or 0 for a receive-only UART. If specified, must be either A2 or A4. </td></tr>
    <tr><td class="paramname">rx_pin</td><td>The pin the watch will use to receive, or 0 for a transmit-only UART. If specified, must be A1, A2, A3 or A4 (pin A0 cannot receive UART data). </td></tr>
    <tr><td class="paramname">baud</td><td>The baud rate for the UART. A typical value is 19200. </td></tr>
  </table>
  </dd>
</dl>

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<a id="ga0c400bfcd52bb71e8de62c5ab2373db6" name="ga0c400bfcd52bb71e8de62c5ab2373db6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga0c400bfcd52bb71e8de62c5ab2373db6">&#9670;&nbsp;</a></span>watch_uart_getc()</h2>

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          <td class="memname">char watch_uart_getc </td>
          <td>(</td>
          <td class="paramtype">void&#160;</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Receives a single byte from the UART's RX pin. </p>
<dl class="section return"><dt>Returns</dt><dd>the received byte. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>This method will block until a byte is received! </dd></dl>

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<a id="ga5d62683298c511f24adaab4bf6615c50" name="ga5d62683298c511f24adaab4bf6615c50"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5d62683298c511f24adaab4bf6615c50">&#9670;&nbsp;</a></span>watch_uart_puts()</h2>

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          <td class="memname">void watch_uart_puts </td>
          <td>(</td>
          <td class="paramtype">char *&#160;</td>
          <td class="paramname"><em>s</em></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Transmits a string of bytes on the UART's TX pin. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">s</td><td>A null-terminated string containing the bytes you wish to transmit. </td></tr>
  </table>
  </dd>
</dl>

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