uart_8c.html

使用AVR单片机控制步进电机的软件代码

          <td class="md" nowrap valign="top"> void uart_SendByte           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">unsigned char&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>data</em>          </td>
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<p>
send a byte. 
<p>
Puts a byte in TX buffer and starts uart TX interrupt. If TX buffer is full it will hang until space.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td></td><td valign=top><em>data</em>&nbsp;</td><td>Data to be sent. </td></tr>
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<p>
Definition at line <a class="el" href="uart_8c-source.html#l00073">73</a> of file <a class="el" href="uart_8c-source.html">uart.c</a>.
<p>
References <a class="el" href="uart_8h-source.html#l00036">SET_UDRIE</a>, and <a class="el" href="uart_8h-source.html#l00031">UART_TX_BUFFER_MASK</a>.
<p>
Referenced by <a class="el" href="main_8c-source.html#l00173">ShowHelp()</a>, <a class="el" href="uart_8c-source.html#l00146">UART_RX_interrupt()</a>, <a class="el" href="uart_8c-source.html#l00111">uart_SendInt()</a>, and <a class="el" href="uart_8c-source.html#l00097">uart_SendString()</a>.
<p>
<pre class="fragment"><div>00074 {
00075   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> tmphead;
00076 
00077   <span class="comment">// Calculate buffer index</span>
00078   tmphead = ( UART_TxHead + 1 ) &amp; <a class="code" href="uart_8h.html#a3">UART_TX_BUFFER_MASK</a>;
00079   <span class="comment">// Wait for free space in buffer</span>
00080   <span class="keywordflow">while</span> ( tmphead == UART_TxTail )
00081     ;
00082   <span class="comment">// Store data in buffer</span>
00083   UART_TxBuffer[tmphead] = data;
00084   <span class="comment">// Store new index</span>
00085   UART_TxHead = tmphead;
00086   <span class="comment">// Enable UDRE interrupt</span>
00087   <a class="code" href="uart_8h.html#a4">SET_UDRIE</a>;
00088 }
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<a class="anchor" name="a9" doxytag="uart.c::uart_SendInt" ></a><p>
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          <td class="md" nowrap valign="top"> void uart_SendInt           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">int&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>x</em>          </td>
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<p>
Sends a integer. 
<p>
Converts a integer to ASCII and sends it using uart_SendByte. If TX buffer is full it will hang until space.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
  <table border="0" cellspacing="2" cellpadding="0">
    <tr><td></td><td valign=top><em>x</em>&nbsp;</td><td>Integer to be sent. </td></tr>
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<p>
Definition at line <a class="el" href="uart_8c-source.html#l00111">111</a> of file <a class="el" href="uart_8c-source.html">uart.c</a>.
<p>
References <a class="el" href="uart_8c-source.html#l00073">uart_SendByte()</a>.
<p>
Referenced by <a class="el" href="main_8c-source.html#l00190">ShowData()</a>.
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<pre class="fragment"><div>00112 {
00113   <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> dec[] = <span class="stringliteral">"0123456789"</span>;
00114   <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> div_val = 10000;
00115 
00116   <span class="keywordflow">if</span> (x &lt; 0){
00117     x = - x;
00118     <a class="code" href="uart_8h.html#a8">uart_SendByte</a>(<span class="charliteral">'-'</span>);
00119   }
00120   <span class="keywordflow">while</span> (div_val &gt; 1 &amp;&amp; div_val &gt; x)
00121     div_val /= 10;
00122   <span class="keywordflow">do</span>{
00123     <a class="code" href="uart_8h.html#a8">uart_SendByte</a> (dec[x / div_val]);
00124     x %= div_val;
00125     div_val /= 10;
00126   }<span class="keywordflow">while</span>(div_val);
00127 }
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<a class="anchor" name="a8" doxytag="uart.c::uart_SendString" ></a><p>
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          <td class="md" nowrap valign="top"> void uart_SendString           </td>
          <td class="md" valign="top">(&nbsp;</td>
          <td class="md" nowrap valign="top">unsigned char&nbsp;</td>
          <td class="mdname1" valign="top" nowrap> <em>Str</em>[]          </td>
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<p>
Sends a string. 
<p>
Loops thru a string and send each byte with uart_SendByte. If TX buffer is full it will hang until space.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
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    <tr><td></td><td valign=top><em>Str</em>&nbsp;</td><td>String to be sent. </td></tr>
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<p>
Definition at line <a class="el" href="uart_8c-source.html#l00097">97</a> of file <a class="el" href="uart_8c-source.html">uart.c</a>.
<p>
References <a class="el" href="uart_8c-source.html#l00073">uart_SendByte()</a>.
<p>
Referenced by <a class="el" href="main_8c-source.html#l00062">main()</a>, and <a class="el" href="main_8c-source.html#l00190">ShowData()</a>.
<p>
<pre class="fragment"><div>00098 {
00099   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> n = 0;
00100   <span class="keywordflow">while</span>(Str[n])
00101     <a class="code" href="uart_8h.html#a8">uart_SendByte</a>(Str[n++]);
00102 }
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<a class="anchor" name="a12" doxytag="uart.c::UART_TX_interrupt" ></a><p>
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          <td class="md" nowrap valign="top"> __interrupt void UART_TX_interrupt           </td>
          <td class="md" valign="top">(&nbsp;</td>
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<p>
TX interrupt handler. 
<p>
TX interrupt handler. TX interrupt turned on by uart_SendByte, turned off when TX buffer is empty. 
<p>
Definition at line <a class="el" href="uart_8c-source.html#l00200">200</a> of file <a class="el" href="uart_8c-source.html">uart.c</a>.
<p>
References <a class="el" href="uart_8h-source.html#l00037">CLR_UDRIE</a>, and <a class="el" href="uart_8h-source.html#l00031">UART_TX_BUFFER_MASK</a>.
<p>
<pre class="fragment"><div>00201 {
00202   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> UART_TxTail_tmp;
00203    UART_TxTail_tmp = UART_TxTail;
00204 
00205   <span class="comment">// Check if all data is transmitted</span>
00206   <span class="keywordflow">if</span> ( UART_TxHead !=  UART_TxTail_tmp )
00207   {
00208     <span class="comment">// Calculate buffer index</span>
00209     UART_TxTail_tmp = ( UART_TxTail + 1 ) &amp; <a class="code" href="uart_8h.html#a3">UART_TX_BUFFER_MASK</a>;
00210     <span class="comment">// Store new index</span>
00211     UART_TxTail =  UART_TxTail_tmp;
00212     <span class="comment">// Start transmition</span>
00213     UDR0= UART_TxBuffer[ UART_TxTail_tmp];
00214   }
00215   <span class="keywordflow">else</span>
00216     <span class="comment">// Disable UDRE interrupt</span>
00217     <a class="code" href="uart_8h.html#a5">CLR_UDRIE</a>;
00218 }
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<hr><h2>Variable Documentation</h2>
<a class="anchor" name="a1" doxytag="uart.c::UART_RxBuffer" ></a><p>
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          <td class="md" nowrap valign="top"> unsigned char <a class="el" href="uart_8h.html#a6">UART_RxBuffer</a>[UART_RX_BUFFER_SIZE]          </td>
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<p>
Buffer with received string from uart. 
<p>

<p>
Definition at line <a class="el" href="uart_8c-source.html#l00027">27</a> of file <a class="el" href="uart_8c-source.html">uart.c</a>.
<p>
Referenced by <a class="el" href="main_8c-source.html#l00062">main()</a>, <a class="el" href="uart_8c-source.html#l00135">uart_FlushRxBuffer()</a>, and <a class="el" href="uart_8c-source.html#l00146">UART_RX_interrupt()</a>.    </td>
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<a class="anchor" name="a2" doxytag="uart.c::UART_RxPtr" ></a><p>
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          <td class="md" nowrap valign="top"> unsigned char <a class="el" href="uart_8c.html#a2">UART_RxPtr</a>          </td>
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<p>
RX buffer pointer. 
<p>

<p>
Definition at line <a class="el" href="uart_8c-source.html#l00029">29</a> of file <a class="el" href="uart_8c-source.html">uart.c</a>.
<p>
Referenced by <a class="el" href="uart_8c-source.html#l00045">InitUART()</a>, <a class="el" href="uart_8c-source.html#l00135">uart_FlushRxBuffer()</a>, and <a class="el" href="uart_8c-source.html#l00146">UART_RX_interrupt()</a>.    </td>
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