uart2_8c-source.html

ATMEL的AVR单片机库文件

00184         <span class="keywordflow">return</span> -1;
00185 }
00186 
00187 <span class="keywordtype">int</span> uart1GetByte(<span class="keywordtype">void</span>)
00188 {
00189     <span class="comment">// get single byte from receive buffer (if available)</span>
00190     u08 c;
00191     <span class="keywordflow">if</span>(<a class="code" href="uart2_8h.html#a31">uartReceiveByte</a>(1,&amp;c))
00192         <span class="keywordflow">return</span> c;
00193     <span class="keywordflow">else</span>
00194         <span class="keywordflow">return</span> -1;
00195 }
00196 
00197 
<a name="l00198"></a><a class="code" href="uart2_8h.html#a31">00198</a> u08 <a class="code" href="uart2_8h.html#a31">uartReceiveByte</a>(u08 nUart, u08* rxData)
00199 {
00200     <span class="comment">// make sure we have a receive buffer</span>
00201     <span class="keywordflow">if</span>(<a class="code" href="uart_8c.html#a2">uartRxBuffer</a>[nUart].size)
00202     {
00203         <span class="comment">// make sure we have data</span>
00204         <span class="keywordflow">if</span>(<a class="code" href="uart_8c.html#a2">uartRxBuffer</a>[nUart].datalength)
00205         {
00206             <span class="comment">// get byte from beginning of buffer</span>
00207             *rxData = <a class="code" href="buffer_8h.html#a2">bufferGetFromFront</a>(&amp;<a class="code" href="uart_8c.html#a2">uartRxBuffer</a>[nUart]);
00208             <span class="keywordflow">return</span> TRUE;
00209         }
00210         <span class="keywordflow">else</span>
00211             <span class="keywordflow">return</span> FALSE;           <span class="comment">// no data</span>
00212     }
00213     <span class="keywordflow">else</span>
00214         <span class="keywordflow">return</span> FALSE;               <span class="comment">// no buffer</span>
00215 }
00216 
<a name="l00217"></a><a class="code" href="uart2_8h.html#a33">00217</a> <span class="keywordtype">void</span> <a class="code" href="uart_8c.html#a18">uartFlushReceiveBuffer</a>(u08 nUart)
00218 {
00219     <span class="comment">// flush all data from receive buffer</span>
00220     <a class="code" href="buffer_8h.html#a7">bufferFlush</a>(&amp;<a class="code" href="uart_8c.html#a2">uartRxBuffer</a>[nUart]);
00221 }
00222 
<a name="l00223"></a><a class="code" href="uart2_8h.html#a32">00223</a> u08 <a class="code" href="uart_8c.html#a19">uartReceiveBufferIsEmpty</a>(u08 nUart)
00224 {
00225     <span class="keywordflow">return</span> (<a class="code" href="uart_8c.html#a2">uartRxBuffer</a>[nUart].datalength == 0);
00226 }
00227 
<a name="l00228"></a><a class="code" href="uart2_8h.html#a34">00228</a> <span class="keywordtype">void</span> <a class="code" href="uart2_8h.html#a34">uartAddToTxBuffer</a>(u08 nUart, u08 data)
00229 {
00230     <span class="comment">// add data byte to the end of the tx buffer</span>
00231     <a class="code" href="buffer_8h.html#a5">bufferAddToEnd</a>(&amp;<a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[nUart], data);
00232 }
00233 
<a name="l00234"></a><a class="code" href="uart2_8h.html#a35">00234</a> <span class="keywordtype">void</span> <a class="code" href="uart2_8h.html#a35">uart0AddToTxBuffer</a>(u08 data)
00235 {
00236     <a class="code" href="uart2_8h.html#a34">uartAddToTxBuffer</a>(0,data);
00237 }
00238 
00239 <span class="keywordtype">void</span> uart1AddToTxBuffer(u08 data)
00240 {
00241     <a class="code" href="uart2_8h.html#a34">uartAddToTxBuffer</a>(1,data);
00242 }
00243 
<a name="l00244"></a><a class="code" href="uart2_8h.html#a37">00244</a> <span class="keywordtype">void</span> <a class="code" href="uart_8c.html#a21">uartSendTxBuffer</a>(u08 nUart)
00245 {
00246     <span class="comment">// turn on buffered transmit</span>
00247     <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = TRUE;
00248     <span class="comment">// send the first byte to get things going by interrupts</span>
00249     <a class="code" href="uart2_8h.html#a26">uartSendByte</a>(nUart, <a class="code" href="buffer_8h.html#a2">bufferGetFromFront</a>(&amp;<a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[nUart]));
00250 }
00251 
<a name="l00252"></a><a class="code" href="uart2_8h.html#a38">00252</a> u08 <a class="code" href="uart2_8h.html#a38">uartSendBuffer</a>(u08 nUart, <span class="keywordtype">char</span> *buffer, u16 nBytes)
00253 {
00254     <span class="keyword">register</span> u08 first;
00255     <span class="keyword">register</span> u16 i;
00256 
00257     <span class="comment">// check if there's space (and that we have any bytes to send at all)</span>
00258     <span class="keywordflow">if</span>((<a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[nUart].datalength + nBytes &lt; <a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[nUart].size) &amp;&amp; nBytes)
00259     {
00260         <span class="comment">// grab first character</span>
00261         first = *buffer++;
00262         <span class="comment">// copy user buffer to uart transmit buffer</span>
00263         <span class="keywordflow">for</span>(i = 0; i &lt; nBytes-1; i++)
00264         {
00265             <span class="comment">// put data bytes at end of buffer</span>
00266             <a class="code" href="buffer_8h.html#a5">bufferAddToEnd</a>(&amp;<a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[nUart], *buffer++);
00267         }
00268 
00269         <span class="comment">// send the first byte to get things going by interrupts</span>
00270         <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = TRUE;
00271         <a class="code" href="uart2_8h.html#a26">uartSendByte</a>(nUart, first);
00272         <span class="comment">// return success</span>
00273         <span class="keywordflow">return</span> TRUE;
00274     }
00275     <span class="keywordflow">else</span>
00276     {
00277         <span class="comment">// return failure</span>
00278         <span class="keywordflow">return</span> FALSE;
00279     }
00280 }
00281 
00282 <span class="comment">// UART Transmit Complete Interrupt Function</span>
<a name="l00283"></a><a class="code" href="uart2_8h.html#a39">00283</a> <span class="keywordtype">void</span> <a class="code" href="uart2_8h.html#a39">uartTransmitService</a>(u08 nUart)
00284 {
00285     <span class="comment">// check if buffered tx is enabled</span>
00286     <span class="keywordflow">if</span>(<a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart])
00287     {
00288         <span class="comment">// check if there's data left in the buffer</span>
00289         <span class="keywordflow">if</span>(<a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[nUart].datalength)
00290         {
00291             <span class="comment">// send byte from top of buffer</span>
00292             <span class="keywordflow">if</span>(nUart)
00293                 outb(UDR1,  <a class="code" href="buffer_8h.html#a2">bufferGetFromFront</a>(&amp;<a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[1]) );
00294             <span class="keywordflow">else</span>
00295                 outb(UDR0,  <a class="code" href="buffer_8h.html#a2">bufferGetFromFront</a>(&amp;<a class="code" href="uart_8c.html#a3">uartTxBuffer</a>[0]) );
00296         }
00297         <span class="keywordflow">else</span>
00298         {
00299             <span class="comment">// no data left</span>
00300             <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = FALSE;
00301             <span class="comment">// return to ready state</span>
00302             <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[nUart] = TRUE;
00303         }
00304     }
00305     <span class="keywordflow">else</span>
00306     {
00307         <span class="comment">// we're using single-byte tx mode</span>
00308         <span class="comment">// indicate transmit complete, back to ready</span>
00309         <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[nUart] = TRUE;
00310     }
00311 }
00312 
00313 <span class="comment">// UART Receive Complete Interrupt Function</span>
00314 <span class="keywordtype">void</span> uartReceiveService(u08 nUart)
00315 {
00316     u08 c;
00317     <span class="comment">// get received char</span>
00318     <span class="keywordflow">if</span>(nUart)
00319         c = inb(UDR1);
00320     <span class="keywordflow">else</span>
00321         c = inb(UDR0);
00322 
00323     <span class="comment">// if there's a user function to handle this receive event</span>
00324     <span class="keywordflow">if</span>(UartRxFunc[nUart])
00325     {
00326         <span class="comment">// call it and pass the received data</span>
00327         UartRxFunc[nUart](c);
00328     }
00329     <span class="keywordflow">else</span>
00330     {
00331         <span class="comment">// otherwise do default processing</span>
00332         <span class="comment">// put received char in buffer</span>
00333         <span class="comment">// check if there's space</span>
00334         <span class="keywordflow">if</span>( !<a class="code" href="buffer_8h.html#a5">bufferAddToEnd</a>(&amp;uartRxBuffer[nUart], c) )
00335         {
00336             <span class="comment">// no space in buffer</span>
00337             <span class="comment">// count overflow</span>
00338             <a class="code" href="uart_8c.html#a4">uartRxOverflow</a>[nUart]++;
00339         }
00340     }
00341 }
00342 
00343 UART_INTERRUPT_HANDLER(SIG_UART0_TRANS)      
00344 {
00345     <span class="comment">// service UART0 transmit interrupt</span>
00346     <a class="code" href="uart2_8h.html#a39">uartTransmitService</a>(0);
00347 }
00348 
00349 UART_INTERRUPT_HANDLER(SIG_UART1_TRANS)      
00350 {
00351     <span class="comment">// service UART1 transmit interrupt</span>
00352     <a class="code" href="uart2_8h.html#a39">uartTransmitService</a>(1);
00353 }
00354 
00355 UART_INTERRUPT_HANDLER(SIG_UART0_RECV)      
00356 {
00357     <span class="comment">// service UART0 receive interrupt</span>
00358     uartReceiveService(0);
00359 }
00360 
00361 UART_INTERRUPT_HANDLER(SIG_UART1_RECV)      
00362 {
00363     <span class="comment">// service UART1 receive interrupt</span>
00364     uartReceiveService(1);
00365 }
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