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avr cpu 库源代码 对avr单片机编程很有帮助

00190 
<a name="l00191"></a><a class="code" href="group__uart2.html#ga12">00191</a> <span class="keywordtype">int</span> <a class="code" href="group__uart2.html#ga12">uart0GetByte</a>(<span class="keywordtype">void</span>)
00192 {
00193     <span class="comment">// get single byte from receive buffer (if available)</span>
00194     u08 c;
00195     <span class="keywordflow">if</span>(<a class="code" href="group__uart.html#ga8">uartReceiveByte</a>(0,&amp;c))
00196         <span class="keywordflow">return</span> c;
00197     <span class="keywordflow">else</span>
00198         <span class="keywordflow">return</span> -1;
00199 }
00200 
00201 <span class="keywordtype">int</span> uart1GetByte(<span class="keywordtype">void</span>)
00202 {
00203     <span class="comment">// get single byte from receive buffer (if available)</span>
00204     u08 c;
00205     <span class="keywordflow">if</span>(<a class="code" href="group__uart.html#ga8">uartReceiveByte</a>(1,&amp;c))
00206         <span class="keywordflow">return</span> c;
00207     <span class="keywordflow">else</span>
00208         <span class="keywordflow">return</span> -1;
00209 }
00210 
00211 
<a name="l00212"></a><a class="code" href="group__uart2.html#ga14">00212</a> u08 <a class="code" href="group__uart.html#ga8">uartReceiveByte</a>(u08 nUart, u08* rxData)
00213 {
00214     <span class="comment">// make sure we have a receive buffer</span>
00215     <span class="keywordflow">if</span>(uartRxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o1">size</a>)
00216     {
00217         <span class="comment">// make sure we have data</span>
00218         <span class="keywordflow">if</span>(uartRxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o2">datalength</a>)
00219         {
00220             <span class="comment">// get byte from beginning of buffer</span>
00221             *rxData = <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&amp;uartRxBuffer[nUart]);
00222             <span class="keywordflow">return</span> TRUE;
00223         }
00224         <span class="keywordflow">else</span>
00225             <span class="keywordflow">return</span> FALSE;           <span class="comment">// no data</span>
00226     }
00227     <span class="keywordflow">else</span>
00228         <span class="keywordflow">return</span> FALSE;               <span class="comment">// no buffer</span>
00229 }
00230 
<a name="l00231"></a><a class="code" href="group__uart2.html#ga16">00231</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga10">uartFlushReceiveBuffer</a>(u08 nUart)
00232 {
00233     <span class="comment">// flush all data from receive buffer</span>
00234     <a class="code" href="group__buffer.html#ga7">bufferFlush</a>(&amp;uartRxBuffer[nUart]);
00235 }
00236 
<a name="l00237"></a><a class="code" href="group__uart2.html#ga15">00237</a> u08 <a class="code" href="group__uart.html#ga9">uartReceiveBufferIsEmpty</a>(u08 nUart)
00238 {
00239     <span class="keywordflow">return</span> (uartRxBuffer[nUart].datalength == 0);
00240 }
00241 
<a name="l00242"></a><a class="code" href="group__uart2.html#ga17">00242</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga11">uartAddToTxBuffer</a>(u08 nUart, u08 data)
00243 {
00244     <span class="comment">// add data byte to the end of the tx buffer</span>
00245     <a class="code" href="group__buffer.html#ga5">bufferAddToEnd</a>(&amp;uartTxBuffer[nUart], data);
00246 }
00247 
<a name="l00248"></a><a class="code" href="group__uart2.html#ga18">00248</a> <span class="keywordtype">void</span> <a class="code" href="group__uart2.html#ga18">uart0AddToTxBuffer</a>(u08 data)
00249 {
00250     <a class="code" href="group__uart.html#ga11">uartAddToTxBuffer</a>(0,data);
00251 }
00252 
00253 <span class="keywordtype">void</span> uart1AddToTxBuffer(u08 data)
00254 {
00255     <a class="code" href="group__uart.html#ga11">uartAddToTxBuffer</a>(1,data);
00256 }
00257 
<a name="l00258"></a><a class="code" href="group__uart2.html#ga20">00258</a> <span class="keywordtype">void</span> <a class="code" href="group__uart.html#ga12">uartSendTxBuffer</a>(u08 nUart)
00259 {
00260     <span class="comment">// turn on buffered transmit</span>
00261     <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = TRUE;
00262     <span class="comment">// send the first byte to get things going by interrupts</span>
00263     <a class="code" href="group__uart.html#ga6">uartSendByte</a>(nUart, <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&amp;uartTxBuffer[nUart]));
00264 }
00265 
<a name="l00266"></a><a class="code" href="group__uart2.html#ga21">00266</a> u08 <a class="code" href="group__uart.html#ga13">uartSendBuffer</a>(u08 nUart, <span class="keywordtype">char</span> *buffer, u16 nBytes)
00267 {
00268     <span class="keyword">register</span> u08 first;
00269     <span class="keyword">register</span> u16 i;
00270 
00271     <span class="comment">// check if there's space (and that we have any bytes to send at all)</span>
00272     <span class="keywordflow">if</span>((uartTxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o2">datalength</a> + nBytes &lt; uartTxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o1">size</a>) &amp;&amp; nBytes)
00273     {
00274         <span class="comment">// grab first character</span>
00275         first = *buffer++;
00276         <span class="comment">// copy user buffer to uart transmit buffer</span>
00277         <span class="keywordflow">for</span>(i = 0; i &lt; nBytes-1; i++)
00278         {
00279             <span class="comment">// put data bytes at end of buffer</span>
00280             <a class="code" href="group__buffer.html#ga5">bufferAddToEnd</a>(&amp;uartTxBuffer[nUart], *buffer++);
00281         }
00282 
00283         <span class="comment">// send the first byte to get things going by interrupts</span>
00284         <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = TRUE;
00285         <a class="code" href="group__uart.html#ga6">uartSendByte</a>(nUart, first);
00286         <span class="comment">// return success</span>
00287         <span class="keywordflow">return</span> TRUE;
00288     }
00289     <span class="keywordflow">else</span>
00290     {
00291         <span class="comment">// return failure</span>
00292         <span class="keywordflow">return</span> FALSE;
00293     }
00294 }
00295 
00296 <span class="comment">// UART Transmit Complete Interrupt Function</span>
<a name="l00297"></a><a class="code" href="group__uart2.html#ga22">00297</a> <span class="keywordtype">void</span> <a class="code" href="group__uart2.html#ga22">uartTransmitService</a>(u08 nUart)
00298 {
00299     <span class="comment">// check if buffered tx is enabled</span>
00300     <span class="keywordflow">if</span>(<a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart])
00301     {
00302         <span class="comment">// check if there's data left in the buffer</span>
00303         <span class="keywordflow">if</span>(uartTxBuffer[nUart].<a class="code" href="structstruct__cBuffer.html#o2">datalength</a>)
00304         {
00305             <span class="comment">// send byte from top of buffer</span>
00306             <span class="keywordflow">if</span>(nUart)
00307                 outb(UDR1,  <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&amp;uartTxBuffer[1]) );
00308             <span class="keywordflow">else</span>
00309                 outb(UDR0,  <a class="code" href="group__buffer.html#ga2">bufferGetFromFront</a>(&amp;uartTxBuffer[0]) );
00310         }
00311         <span class="keywordflow">else</span>
00312         {
00313             <span class="comment">// no data left</span>
00314             <a class="code" href="uart_8c.html#a1">uartBufferedTx</a>[nUart] = FALSE;
00315             <span class="comment">// return to ready state</span>
00316             <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[nUart] = TRUE;
00317         }
00318     }
00319     <span class="keywordflow">else</span>
00320     {
00321         <span class="comment">// we're using single-byte tx mode</span>
00322         <span class="comment">// indicate transmit complete, back to ready</span>
00323         <a class="code" href="uart_8c.html#a0">uartReadyTx</a>[nUart] = TRUE;
00324     }
00325 }
00326 
00327 <span class="comment">// UART Receive Complete Interrupt Function</span>
00328 <span class="keywordtype">void</span> uartReceiveService(u08 nUart)
00329 {
00330     u08 c;
00331     <span class="comment">// get received char</span>
00332     <span class="keywordflow">if</span>(nUart)
00333         c = inb(UDR1);
00334     <span class="keywordflow">else</span>
00335         c = inb(UDR0);
00336 
00337     <span class="comment">// if there's a user function to handle this receive event</span>
00338     <span class="keywordflow">if</span>(UartRxFunc[nUart])
00339     {
00340         <span class="comment">// call it and pass the received data</span>
00341         UartRxFunc[nUart](c);
00342     }
00343     <span class="keywordflow">else</span>
00344     {
00345         <span class="comment">// otherwise do default processing</span>
00346         <span class="comment">// put received char in buffer</span>
00347         <span class="comment">// check if there's space</span>
00348         <span class="keywordflow">if</span>( !<a class="code" href="group__buffer.html#ga5">bufferAddToEnd</a>(&amp;uartRxBuffer[nUart], c) )
00349         {
00350             <span class="comment">// no space in buffer</span>
00351             <span class="comment">// count overflow</span>
00352             <a class="code" href="uart_8c.html#a4">uartRxOverflow</a>[nUart]++;
00353         }
00354     }
00355 }
00356 
00357 <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART0_TRANS)      
00358 {
00359     <span class="comment">// service UART0 transmit interrupt</span>
00360     <a class="code" href="group__uart2.html#ga22">uartTransmitService</a>(0);
00361 }
00362 
00363 <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART1_TRANS)      
00364 {
00365     <span class="comment">// service UART1 transmit interrupt</span>
00366     <a class="code" href="group__uart2.html#ga22">uartTransmitService</a>(1);
00367 }
00368 
00369 <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART0_RECV)      
00370 {
00371     <span class="comment">// service UART0 receive interrupt</span>
00372     uartReceiveService(0);
00373 }
00374 
00375 <a class="code" href="group__uart.html#ga17">UART_INTERRUPT_HANDLER</a>(SIG_UART1_RECV)      
00376 {
00377     <span class="comment">// service UART1 receive interrupt</span>
00378     uartReceiveService(1);
00379 }
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