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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/usart/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_7f7ec19554deddf0beb795c9218a445b.html">usart</a></div><h1>usart.c</h1><a href="testsuite_2bravo__validation_2usart_2usart_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="preprocessor">#include "<a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html">usart.h</a>"</span><a name="l00002"></a>00002 <a name="l00003"></a>00003 <span class="comment">/*</span><a name="l00004"></a>00004 <span class="comment"> * Description: Check if the usart is in multidrop</span><a name="l00005"></a>00005 <span class="comment"> * Arguments: *usart: Base address of the usart</span><a name="l00006"></a>00006 <span class="comment"> * Returns: 1 if the usart is in multidrop mode, otherwise 0</span><a name="l00007"></a>00007 <span class="comment"> */</span><a name="l00008"></a><a class="code" href="testsuite_2bravo__validation_2usart_2usart_8c.html#cc362133839fdd80c3a8c484ccda0cc6">00008</a> <span class="keyword">static</span> <span class="keywordtype">int</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8c.html#cc362133839fdd80c3a8c484ccda0cc6">usart_mode_is_multidrop</a>(<span class="keyword">volatile</span> avr32_usart_t * usart)<a name="l00009"></a>00009 {<a name="l00010"></a>00010 <span class="keywordflow">return</span> (((usart->mr & 0x00000600)>>(AVR32_USART_MR_PAR_OFFSET+1)) == 3);<a name="l00011"></a>00011 }<a name="l00012"></a>00012 <a name="l00013"></a><a class="code" href="testsuite_2bravo__validation_2usart_2usart_8c.html#31cf4d67fd204fb4684fff9d7994cb4c">00013</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="l00014"></a>00014 {<a name="l00015"></a>00015 <span class="comment">/* Disable all usart interrupts, interrupts needed should be set</span><a name="l00016"></a>00016 <span class="comment"> explicitly on every reset */</span><a name="l00017"></a>00017 usart->idr = 0xFFFFffff;<a name="l00018"></a>00018 <a name="l00019"></a>00019 <span class="comment">/* Reset mode and other registers that could cause unpredictable</span><a name="l00020"></a>00020 <span class="comment"> behaviour after reset */</span><a name="l00021"></a>00021 usart->mr = 0;<a name="l00022"></a>00022 usart->rtor = 0;<a name="l00023"></a>00023 usart->ttgr = 0;<a name="l00024"></a>00024 <a name="l00025"></a>00025 <span class="comment">/* Shutdown RX and TX (will be reenabled when setup</span><a name="l00026"></a>00026 <span class="comment"> is completed successfully), reset status bits and turn</span><a name="l00027"></a>00027 <span class="comment"> off DTR and RTS */</span><a name="l00028"></a>00028 usart->cr = (1 << AVR32_USART_CR_RSTRX_OFFSET) |<a name="l00029"></a>00029 (1 << AVR32_USART_CR_RSTTX_OFFSET) |<a name="l00030"></a>00030 (1 << AVR32_USART_CR_RSTSTA_OFFSET) |<a name="l00031"></a>00031 (1 << AVR32_USART_CR_RSTIT_OFFSET) |<a name="l00032"></a>00032 (1 << AVR32_USART_CR_RSTNACK_OFFSET) |<a name="l00033"></a>00033 (1 << AVR32_USART_CR_DTRDIS_OFFSET) |<a name="l00034"></a>00034 (1 << AVR32_USART_CR_RTSDIS_OFFSET);<a name="l00035"></a>00035 }<a name="l00036"></a>00036 <a name="l00037"></a>00037 <a name="l00048"></a><a class="code" href="testsuite_2bravo__validation_2usart_2usart_8c.html#87da5bc4206db1f5f9ada10c9caa286b">00048</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, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="structusart__options__t.html#276ad428776a25b8247762bd2c82b35b">baudrate</a>, <span class="keywordtype">long</span> cpu_hz)<a name="l00049"></a>00049 {<a name="l00050"></a>00050 <span class="keywordtype">int</span> cd; <span class="comment">/* Clock divider */</span><a name="l00051"></a>00051 <a name="l00052"></a>00052 <span class="comment">/*</span><a name="l00053"></a>00053 <span class="comment"> * ** BAUDRATE CALCULATION **</span><a name="l00054"></a>00054 <span class="comment"> *</span><a name="l00055"></a>00055 <span class="comment"> * Selected Clock Selected Clock</span><a name="l00056"></a>00056 <span class="comment"> * baudrate = ---------------- or baudrate = ----------------</span><a name="l00057"></a>00057 <span class="comment"> * 16 x (CD + FP/8) 8 x (CD + FP/8)</span><a name="l00058"></a>00058 <span class="comment"> *</span><a name="l00059"></a>00059 <span class="comment"> * (with 16x oversampling) (with 8x oversampling)</span><a name="l00060"></a>00060 <span class="comment"> */</span><a name="l00061"></a>00061 <span class="keywordflow">if</span> (baudrate > (cpu_hz/16)) {<a name="l00062"></a>00062 <span class="comment">/* Use 8x oversampling */</span><a name="l00063"></a>00063 usart->mr |= (1<<AVR32_USART_MR_OVER_OFFSET);<a name="l00064"></a>00064 cd = cpu_hz / (8*baudrate);<a name="l00065"></a>00065 <a name="l00066"></a>00066 <span class="keywordflow">if</span> (cd < 2) {<a name="l00067"></a>00067 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00068"></a>00068 }<a name="l00069"></a>00069 usart->brgr = (cd << AVR32_USART_BRGR_CD_OFFSET);<a name="l00070"></a>00070 } <span class="keywordflow">else</span> {<a name="l00071"></a>00071 <span class="comment">/* Use 16x oversampling */</span><a name="l00072"></a>00072 usart->mr &= ~(1<<AVR32_USART_MR_OVER_OFFSET);<a name="l00073"></a>00073 cd = cpu_hz / (16*baudrate);<a name="l00074"></a>00074 <a name="l00075"></a>00075 <span class="keywordflow">if</span> (cd > 65535) {<a name="l00076"></a>00076 <span class="comment">/* Wanted baudrate is too low */</span><a name="l00077"></a>00077 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00078"></a>00078 }<a name="l00079"></a>00079 usart->brgr = (cd << AVR32_USART_BRGR_CD_OFFSET);<a name="l00080"></a>00080 }<a name="l00081"></a>00081 <a name="l00082"></a>00082 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#cbf846773f58a382f10f8daf94797059">USART_SUCCESS</a>;<a name="l00083"></a>00083 }<a name="l00084"></a>00084 <a name="l00085"></a>00085 <a name="l00086"></a>00086 <a name="l00087"></a>00087 <a name="l00088"></a>00088 <span class="comment">/*---------------------------------------------------------------------------+</span><a name="l00089"></a>00089 <span class="comment"> | |</span><a name="l00090"></a>00090 <span class="comment"> | INITIALIZATION FUNCTIONS |</span><a name="l00091"></a>00091 <span class="comment"> | |</span><a name="l00092"></a>00092 <span class="comment"> +---------------------------------------------------------------------------*/</span><a name="l00093"></a>00093 <a name="l00094"></a>00094 <a name="l00095"></a><a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#093c5ad113e1ab43603c0d815ad8dc54">00095</a> <span class="keywordtype">int</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8c.html#093c5ad113e1ab43603c0d815ad8dc54">usart_init_rs232</a>(<span class="keyword">volatile</span> avr32_usart_t * usart, <span class="keyword">struct</span> <a class="code" href="structusart__options__t.html">usart_options_t</a> * opt, <span class="keywordtype">long</span> cpu_hz)<a name="l00096"></a>00096 {<a name="l00097"></a>00097 <span class="keywordtype">int</span> retval;<a name="l00098"></a>00098 <a name="l00099"></a>00099 <span class="comment">/* Reset the usart and shutdown RX and TX */</span><a name="l00100"></a>00100 <a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8c.html#31cf4d67fd204fb4684fff9d7994cb4c">usart_reset</a>(usart);<a name="l00101"></a>00101 <a name="l00102"></a>00102 <span class="comment">/* Control input values */</span><a name="l00103"></a>00103 <span class="keywordflow">if</span> (opt == 0) <span class="comment">/* Null pointer */</span><a name="l00104"></a>00104 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00105"></a>00105 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#a6b77cc05829d2e70ee7f96194c6ce23">charlength</a> < 5 || opt-><a class="code" href="structusart__options__t.html#a6b77cc05829d2e70ee7f96194c6ce23">charlength</a> > 9)<a name="l00106"></a>00106 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00107"></a>00107 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#85401f7a6f516a5883adc0538dc27f8e">paritytype</a> > 7)<a name="l00108"></a>00108 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00109"></a>00109 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#433a6ede2186d42b4cf19ef4b370cd61">stopbits</a> > 2+255)<a name="l00110"></a>00110 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00111"></a>00111 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#0dc365b8779891743180e9b69116f5ea">channelmode</a> > 3)<a name="l00112"></a>00112 <span class="keywordflow">return</span> <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#50b4e9378f434da8823badca3af2f15d">USART_INVALID_INPUT</a>;<a name="l00113"></a>00113 <a name="l00114"></a>00114 <span class="keywordflow">if</span> ((retval = <a class="code" href="testsuite_2bravo__validation_2pdc_2usart_8c.html#38c10272f6d0b8e873a213dd39d5d1cf">usart_set_baudrate</a>(usart, opt-><a class="code" href="structusart__options__t.html#276ad428776a25b8247762bd2c82b35b">baudrate</a>, cpu_hz)) != \<a name="l00115"></a>00115 <a class="code" href="testsuite_2bravo__validation_2usart_2usart_8h.html#cbf846773f58a382f10f8daf94797059">USART_SUCCESS</a>)<a name="l00116"></a>00116 <span class="keywordflow">return</span> retval;<a name="l00117"></a>00117 <a name="l00118"></a>00118 <span class="keywordflow">if</span> (opt-><a class="code" href="structusart__options__t.html#a6b77cc05829d2e70ee7f96194c6ce23">charlength</a> == 9) {<a name="l00119"></a>00119 <span class="comment">/* Charlength set to 9 bits; MODE9 dominates CHRL */</span><a name="l00120"></a>00120 usart->mr |= (1<<AVR32_USART_MR_MODE9_OFFSET);<a name="l00121"></a>00121 } <span class="keywordflow">else</span> {⌨️ 快捷键说明
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