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			196 lines
		
	
	
		
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<title>Sensor Watch: UART</title>
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  <td id="projectalign">
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   <div id="projectname">Sensor Watch<span id="projectnumber"> 0.0.2</span>
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   </div>
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   <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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  </td>
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  <div class="summary">
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<a href="#func-members">Functions</a>  </div>
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  <div class="headertitle"><div class="title">UART</div></div>
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</div><!--header-->
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<div class="contents">
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<p>This section covers functions related to the UART peripheral.  
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<a href="#details">More...</a></p>
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<table class="memberdecls">
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="func-members" name="func-members"></a>
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Functions</h2></td></tr>
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<tr class="memitem:ga38e750d3e02939bf056fde77f4ef6235" id="r_ga38e750d3e02939bf056fde77f4ef6235"><td class="memItemLeft" align="right" valign="top">void </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>
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<tr class="memdesc:ga38e750d3e02939bf056fde77f4ef6235"><td class="mdescLeft"> </td><td class="mdescRight">Initializes the debug UART.  <br /></td></tr>
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<tr class="separator:ga38e750d3e02939bf056fde77f4ef6235"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga5d62683298c511f24adaab4bf6615c50" id="r_ga5d62683298c511f24adaab4bf6615c50"><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__uart.html#ga5d62683298c511f24adaab4bf6615c50">watch_uart_puts</a> (char *s)</td></tr>
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<tr class="memdesc:ga5d62683298c511f24adaab4bf6615c50"><td class="mdescLeft"> </td><td class="mdescRight">Transmits a string of bytes on the UART's TX pin.  <br /></td></tr>
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<tr class="separator:ga5d62683298c511f24adaab4bf6615c50"><td class="memSeparator" colspan="2"> </td></tr>
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<tr class="memitem:ga0c400bfcd52bb71e8de62c5ab2373db6" id="r_ga0c400bfcd52bb71e8de62c5ab2373db6"><td class="memItemLeft" align="right" valign="top">char </td><td class="memItemRight" valign="bottom"><a class="el" href="group__uart.html#ga0c400bfcd52bb71e8de62c5ab2373db6">watch_uart_getc</a> (void)</td></tr>
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<tr class="memdesc:ga0c400bfcd52bb71e8de62c5ab2373db6"><td class="mdescLeft"> </td><td class="mdescRight">Receives a single byte from the UART's RX pin.  <br /></td></tr>
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<tr class="separator:ga0c400bfcd52bb71e8de62c5ab2373db6"><td class="memSeparator" colspan="2"> </td></tr>
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</table>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
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<p>This section covers functions related to the UART peripheral. </p>
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<h2 class="groupheader">Function Documentation</h2>
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<a id="ga38e750d3e02939bf056fde77f4ef6235" name="ga38e750d3e02939bf056fde77f4ef6235"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga38e750d3e02939bf056fde77f4ef6235">◆ </a></span>watch_enable_uart()</h2>
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<div class="memitem">
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<div class="memproto">
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      <table class="memname">
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        <tr>
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          <td class="memname">void watch_enable_uart </td>
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          <td>(</td>
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          <td class="paramtype">const uint8_t </td>
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          <td class="paramname"><em>tx_pin</em>, </td>
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        </tr>
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        <tr>
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          <td class="paramkey"></td>
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          <td></td>
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          <td class="paramtype">const uint8_t </td>
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          <td class="paramname"><em>rx_pin</em>, </td>
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        </tr>
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        <tr>
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          <td class="paramkey"></td>
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          <td></td>
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          <td class="paramtype">uint32_t </td>
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          <td class="paramname"><em>baud</em> </td>
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        </tr>
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        <tr>
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          <td></td>
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          <td>)</td>
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          <td></td><td></td>
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        </tr>
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      </table>
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</div><div class="memdoc">
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<p>Initializes the debug UART. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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  <table class="params">
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    <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>
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    <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>
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    <tr><td class="paramname">baud</td><td>The baud rate for the UART. A typical value is 19200. </td></tr>
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  </table>
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  </dd>
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</dl>
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</div>
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</div>
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<a id="ga0c400bfcd52bb71e8de62c5ab2373db6" name="ga0c400bfcd52bb71e8de62c5ab2373db6"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga0c400bfcd52bb71e8de62c5ab2373db6">◆ </a></span>watch_uart_getc()</h2>
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<div class="memproto">
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      <table class="memname">
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        <tr>
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          <td class="memname">char watch_uart_getc </td>
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          <td>(</td>
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          <td class="paramtype">void </td>
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          <td class="paramname"></td><td>)</td>
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          <td></td>
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        </tr>
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      </table>
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</div><div class="memdoc">
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<p>Receives a single byte from the UART's RX pin. </p>
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<dl class="section return"><dt>Returns</dt><dd>the received byte. </dd></dl>
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<dl class="section note"><dt>Note</dt><dd>This method will block until a byte is received! </dd></dl>
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</div>
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</div>
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<a id="ga5d62683298c511f24adaab4bf6615c50" name="ga5d62683298c511f24adaab4bf6615c50"></a>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5d62683298c511f24adaab4bf6615c50">◆ </a></span>watch_uart_puts()</h2>
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<div class="memitem">
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          <td class="memname">void watch_uart_puts </td>
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          <td>(</td>
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          <td class="paramtype">char * </td>
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          <td class="paramname"><em>s</em></td><td>)</td>
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          <td></td>
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        </tr>
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      </table>
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</div><div class="memdoc">
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<p>Transmits a string of bytes on the UART's TX pin. </p>
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<dl class="params"><dt>Parameters</dt><dd>
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  <table class="params">
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    <tr><td class="paramname">s</td><td>A null-terminated string containing the bytes you wish to transmit. </td></tr>
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  </table>
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  </dd>
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</dl>
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