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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1"><title>AVR321000 Communication with the AVR32 USART: testsuite/bravo_validation/pdc/usart.c Source File</title><link href="doxygen.css" rel="stylesheet" type="text/css"><link href="tabs.css" rel="stylesheet" type="text/css"></head><body><!-- Generated by Doxygen 1.5.1 --><div class="tabs"> <ul> <li><a href="main.html"><span>Main Page</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li id="current"><a href="files.html"><span>Files</span></a></li> <li><a href="dirs.html"><span>Directories</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> </ul></div><div class="tabs"> <ul> <li><a href="files.html"><span>File List</span></a></li> <li><a href="globals.html"><span>Globals</span></a></li> </ul></div><div class="nav"><a class="el" href="dir_ed041fa8052270846d9a0dab17b0d151.html">testsuite</a> » <a class="el" href="dir_18e6971fa792d4606dff45a531675719.html">bravo_validation</a> » <a class="el" href="dir_8c4082e77fbbc3a6ea8174dc22e0d829.html">pdc</a></div><h1>usart.c</h1><a href="testsuite_2bravo__validation_2pdc_2usart_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*This file has been prepared for Doxygen automatic documentation generation.*/</span><a name="l00021"></a>00021 <span class="preprocessor">#include "<a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8h.html">usart.h</a>"</span><a name="l00022"></a>00022 <a name="l00027"></a><a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#31cf4d67fd204fb4684fff9d7994cb4c">00027</a> <span class="keywordtype">void</span> <a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8c.html#31cf4d67fd204fb4684fff9d7994cb4c">usart_reset</a>( <span class="keyword">volatile</span> avr32_usart_t * usart )<a name="l00028"></a>00028 {<a name="l00029"></a>00029 <span class="comment">/* Disable all usart interrupts, interrupts needed should be set</span><a name="l00030"></a>00030 <span class="comment"> explicitly on every reset */</span><a name="l00031"></a>00031 usart->idr = 0xFFFFffff;<a name="l00032"></a>00032 <a name="l00033"></a>00033 <span class="comment">/* Reset mode and other registers that could cause unpredictable</span><a name="l00034"></a>00034 <span class="comment"> behaviour after reset */</span><a name="l00035"></a>00035 usart->mr = 0;<a name="l00036"></a>00036 usart->rtor = 0;<a name="l00037"></a>00037 usart->ttgr = 0;<a name="l00038"></a>00038 <a name="l00039"></a>00039 <span class="comment">/* Shutdown RX and TX (will be reenabled when setup</span><a name="l00040"></a>00040 <span class="comment"> is completed successfully), reset status bits and turn</span><a name="l00041"></a>00041 <span class="comment"> off DTR and RTS */</span><a name="l00042"></a>00042 usart->cr = (1<<AVR32_USART_CR_RSTRX_OFFSET)|<a name="l00043"></a>00043 (1<<AVR32_USART_CR_RSTTX_OFFSET)|<a name="l00044"></a>00044 (1<<AVR32_USART_CR_RSTSTA_OFFSET)|<a name="l00045"></a>00045 (1<<AVR32_USART_CR_RSTIT_OFFSET)|<a name="l00046"></a>00046 (1<<AVR32_USART_CR_RSTNACK_OFFSET)|<a name="l00047"></a>00047 (1<<AVR32_USART_CR_DTRDIS_OFFSET)|<a name="l00048"></a>00048 (1<<AVR32_USART_CR_RTSDIS_OFFSET);<a name="l00049"></a>00049 }<a name="l00050"></a>00050 <a name="l00051"></a>00051 <a name="l00065"></a><a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8c.html#38c10272f6d0b8e873a213dd39d5d1cf">00065</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8c.html#38c10272f6d0b8e873a213dd39d5d1cf">usart_set_baudrate</a>( <span class="keyword">volatile</span> avr32_usart_t * usart,<a name="l00066"></a>00066 <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="structusart__options__t.html#276ad428776a25b8247762bd2c82b35b">baudrate</a>,<a name="l00067"></a>00067 <span class="keywordtype">long</span> cpuHz)<a name="l00068"></a>00068 {<a name="l00069"></a>00069 <span class="keywordtype">int</span> cd, fp; <span class="comment">/* clock divider and fractional part */</span><a name="l00070"></a>00070 <a name="l00071"></a>00071 <span class="comment">/*</span><a name="l00072"></a>00072 <span class="comment"> * ** BAUDRATE CALCULATION **</span><a name="l00073"></a>00073 <span class="comment"> *</span><a name="l00074"></a>00074 <span class="comment"> * selected clock selected clock</span><a name="l00075"></a>00075 <span class="comment"> * baudrate = ---------------- or baudrate = ----------------</span><a name="l00076"></a>00076 <span class="comment"> * 16 x (CD + FP/8) 8 x (CD + FP/8)</span><a name="l00077"></a>00077 <span class="comment"> *</span><a name="l00078"></a>00078 <span class="comment"> * (with 16x oversampling) (with 8x oversampling)</span><a name="l00079"></a>00079 <span class="comment"> */</span><a name="l00080"></a>00080 <span class="keywordflow">if</span>( baudrate > (cpuHz/16) ) {<a name="l00081"></a>00081 <span class="comment">/* use 8x oversampling */</span><a name="l00082"></a>00082 usart->mr |= (1<<AVR32_USART_MR_OVER_OFFSET);<a name="l00083"></a>00083 cd = cpuHz / ( 8 * baudrate );<a name="l00084"></a>00084 <a name="l00085"></a>00085 <span class="keywordflow">if</span>( cd < 2 ) {<a name="l00086"></a>00086 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8h.html#d17dbdaf4e461f67e3b3f41da9e11af9">USART_ERROR_ARGUMENT</a>;<a name="l00087"></a>00087 }<a name="l00088"></a>00088 <a name="l00089"></a>00089 fp = cpuHz / baudrate - 8 * cd;<a name="l00090"></a>00090 usart->brgr = (cd << AVR32_USART_BRGR_CD_OFFSET);<a name="l00091"></a>00091 } <span class="keywordflow">else</span> {<a name="l00092"></a>00092 <span class="comment">/* use 16x oversampling */</span><a name="l00093"></a>00093 usart->mr &= ~(1<<AVR32_USART_MR_OVER_OFFSET);<a name="l00094"></a>00094 cd = cpuHz / ( 16 * baudrate );<a name="l00095"></a>00095 <a name="l00096"></a>00096 <span class="keywordflow">if</span>( cd > 65535 ) {<a name="l00097"></a>00097 <span class="comment">/* wanted baudrate is too low */</span><a name="l00098"></a>00098 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8h.html#d17dbdaf4e461f67e3b3f41da9e11af9">USART_ERROR_ARGUMENT</a>;<a name="l00099"></a>00099 }<a name="l00100"></a>00100 <a name="l00101"></a>00101 fp = cpuHz / ( 2 * baudrate ) - 8 * cd;<a name="l00102"></a>00102 usart->brgr = (cd << AVR32_USART_BRGR_CD_OFFSET);<a name="l00103"></a>00103 }<a name="l00104"></a>00104 <a name="l00105"></a>00105 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8h.html#2067a9071b47751aad8456bddf70b913">USART_OK</a>;<a name="l00106"></a>00106 }<a name="l00107"></a>00107 <a name="l00108"></a>00108 <a name="l00120"></a><a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8h.html#d2cd45d1e18b6d00c182ac3663f0aa72">00120</a> <span class="keywordtype">int</span> <a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8c.html#d2cd45d1e18b6d00c182ac3663f0aa72">usart_init2</a>( <span class="keyword">volatile</span> avr32_usart_t * usart,<a name="l00121"></a>00121 <span class="keyword">struct</span> <a class="code" href="structusart__options__t.html">usart_options_t</a> * opt,<a name="l00122"></a>00122 <span class="keywordtype">long</span> cpuHz )<a name="l00123"></a>00123 {⌨️ 快捷键说明
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