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<article> <h1>奇偶校驗(yàn)?zāi)銜脝幔?/h1> <div id="dph9rrj" class="authorTimeSource"> <span>作者：jobs</span> <span>時(shí)間：2015-09-21</span> <span>來源：電子產(chǎn)品世界</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="lhzzhf9" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://www.ex-cimer.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://www.ex-cimer.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="7p3jj9f" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="r91lpnx" class="content" id="contentDiv" style="position:relative;"> <div id="txpzhff" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p>　　在工作中調(diào)試通訊時(shí)，發(fā)現(xiàn)有諸多的干擾數(shù)據(jù)出現(xiàn)，想想串口通訊除去外部硬件電路去除干擾外，還可以通過軟件來濾掉干擾數(shù)據(jù)，于是我就想到了串口通訊中的<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/奇偶校驗(yàn)"><em>奇偶校驗(yàn)</em></a>。印象中，在編寫<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/STM32"><em>STM32</em></a>F030程序初始化串口時(shí)，對其配置的時(shí)候有一個(gè)屬性是否使用奇偶檢驗(yàn)。我想，只需要簡單修改一下這一個(gè)屬性，程序便大功告成了?？墒墙Y(jié)果真的是我所預(yù)料的嗎?請看下文。</p>本文引用地址：<a href="http://www.ex-cimer.com/article/280413.htm">http://www.ex-cimer.com/article/280413.htm</a> <p>　　我們先來看一下<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/STM32"><em>STM32</em></a>F030的串口初始化程序，程序清單如下：</p> <p>　　USART_InitStructure.USART_BaudRate = 115200; 波特率</p> <p>　　USART_InitStructure.USART_WordLength = USART_WordLength_8b;數(shù)據(jù)位8位</p> <p>　　USART_InitStructure.USART_StopBits = USART_StopBits_1;停止位1位</p> <p>　　USART_InitStructure.USART_Parity = USART_Parity_No;<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/奇偶校驗(yàn)"><em>奇偶校驗(yàn)</em></a>位無</p> <p>　　USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;無硬件流控制</p> <p>　　USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;使能發(fā)送與接收功能</p> <p>　　USART_Init(USART1, &USART_InitStructure);初始化串口1</p> <p>　　上面這段程序沒有特別之處，廣泛示例于各大論壇，教程，而筆者也只是將上面<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/奇偶校驗(yàn)"><em>奇偶校驗(yàn)</em></a>位這一行，修改為了USART_InitStructure.USART_Parity = USART_Parity_Odd;即奇校驗(yàn)。然后，重新編譯，下載，一切正常?？墒?hellip;…</p> <p align="center"><img class="" width="500" height="256" alt="" src="http://editerupload.eepw.com.cn/201509/e4f87e1d8716b881353a62191748c5ea.jpg" /></p> <p>　　從圖1可以清楚看到，在未修改之前，串口能正常接收到字符串，但是在修改之后，取而待之的都是亂碼。無論P(yáng)C機(jī)軟件配置為奇校驗(yàn)，偶檢驗(yàn)，還是無奇偶校驗(yàn)均無正確顯示。頓時(shí)，整個(gè)人的感覺就不好了。555……</p> <p>　　筆者也是借此機(jī)會深入了解了一下奇偶校驗(yàn)，與<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/STM32"><em>STM32</em></a>F030芯片上的實(shí)現(xiàn)?，F(xiàn)在將奇偶校驗(yàn)認(rèn)識的三大誤區(qū)及應(yīng)用實(shí)現(xiàn)分享給大家。</p> <p><strong>　　誤區(qū)一：修改一下串口配置參數(shù)就可以了嗎?</strong></p> <p>　　這個(gè)誤區(qū)我覺得應(yīng)該放在第一位，主要因?yàn)楣P者首先就這樣認(rèn)為的。通過上面的實(shí)例，也已經(jīng)充分說明僅修改一個(gè)屬性是無法實(shí)現(xiàn)的。通過仔細(xì)閱讀編程手冊，發(fā)現(xiàn)在配置奇偶校驗(yàn)屬性后，必須要修改數(shù)據(jù)位為9位，否則PC端無法接收。以下是筆者查詢到的資料(STM32F10xxx參考手冊)：</p> <p align="center"><img class="" width="500" height="319" alt="" src="http://editerupload.eepw.com.cn/201509/fd2a64db9a27a60b9e52c7a05807d035.jpg" /></p> <p>　　通過上面的截圖(圖2)，我們可以看到，如果將串口配置為了奇校驗(yàn)，且數(shù)據(jù)位為8位，那么數(shù)據(jù)位的位7將被替換為奇檢驗(yàn)位——也就是說，原有的數(shù)據(jù)被破壞了。這也就證明了圖1為什么會出現(xiàn)亂碼的現(xiàn)象了。</p> <p>　　既然發(fā)現(xiàn)了錯(cuò)誤，那就要解決。通過查詢相關(guān)文檔，與詳細(xì)閱讀STM32芯片編程手冊，最后通過以下配置即可實(shí)現(xiàn)正常發(fā)送，與奇偶校驗(yàn)。程序配置清單如下：</p> <p>　　USART_InitStructure.USART_WordLength = USART_WordLength_9b;</p> <p>　　USART_InitStructure.USART_Parity = USART_Parity_Odd;</p> <p>　　如果將數(shù)據(jù)位數(shù)擴(kuò)展成9位，那么奇偶校驗(yàn)位將占用新插入的位8，也就不必破壞原數(shù)據(jù)。通過編譯與下載程序，并在PC機(jī)上驗(yàn)證，此方法確實(shí)可行，PC機(jī)數(shù)據(jù)正常接收，再次重現(xiàn)”Hello EEPW”。</p> <p><strong>　　誤區(qū)二：PC機(jī)串口軟件無法實(shí)現(xiàn)奇偶校驗(yàn)發(fā)送?</strong></p> <p>　　筆者在查閱資料的時(shí)候發(fā)現(xiàn)有好多網(wǎng)友都有這樣的觀念，但是筆者的PC機(jī)軟件的確是可以發(fā)送奇偶檢驗(yàn)的。通過多次實(shí)驗(yàn)筆者發(fā)現(xiàn)，SScomm串口工具軟件v3.2版本無法實(shí)現(xiàn)，但SScomm版本v4.2可以實(shí)現(xiàn)。</p> <p>　　雖然說是實(shí)現(xiàn)奇偶校驗(yàn)，但是僅限發(fā)送時(shí)會發(fā)送嚴(yán)格按照配置要求發(fā)送，即會發(fā)送奇偶校驗(yàn)位，從而下位機(jī)將正常接收。但是接收的時(shí)候，并不表示奇偶校驗(yàn)位錯(cuò)誤，上位機(jī)不會接收數(shù)據(jù)——上位機(jī)的具體實(shí)現(xiàn)也是這樣的。上位機(jī)不管奇偶校驗(yàn)是否正確，仍然會正常顯示接收的數(shù)據(jù)，這個(gè)并不影響我們實(shí)際應(yīng)用，也只是說明一下而已。</p> <p><strong>　　誤區(qū)三：STM32F030配置了奇偶校驗(yàn)位，就不會接收到錯(cuò)誤的字節(jié)了</strong></p> <p>　　很遺憾，這個(gè)也是非常大的誤區(qū)。通過在線仿真的數(shù)據(jù)抓取。STM32F030配置為奇校驗(yàn)，無論上位配置了哪一項(xiàng)，均能正常接收到數(shù)據(jù)。但是，還是有不同的地方的。如果奇偶校驗(yàn)開啟后，當(dāng)發(fā)生奇偶校驗(yàn)錯(cuò)誤時(shí)，會觸發(fā)硬件奇偶校驗(yàn)失敗事件，如果開啟了奇偶校驗(yàn)失敗中斷，那么硬件將進(jìn)入奇偶校驗(yàn)中斷。</p> <p>　　以上三個(gè)誤區(qū)筆者已經(jīng)全部分析完畢，那么下面我們將如何針對STM32F030芯片的特性來實(shí)現(xiàn)串口通訊奇偶校驗(yàn)?zāi)?</p> <p>　　在下位機(jī)軟件上，通過誤區(qū)一的分析，我們需要將下位機(jī)STM32F030的串口配置為數(shù)據(jù)位9位，奇檢驗(yàn)或偶檢驗(yàn)，然后開啟奇偶校驗(yàn)位異常中斷。再通過奇偶校驗(yàn)異常中斷中將此次接收到的數(shù)據(jù)丟棄，以實(shí)現(xiàn)錯(cuò)誤字節(jié)的濾除。這里要特別注意，開啟奇偶校驗(yàn)中斷一定要優(yōu)先配置，至少要在接收中斷開啟之前，具體原因筆者尚未能查詢到。</p> <p>　　至于硬件做了些什么，硬件僅僅填充了奇偶校驗(yàn)位，并提示了錯(cuò)誤信息，其并不會為我們主動(dòng)去除接收的數(shù)據(jù)。</p> <p>　　對于PC機(jī)上的串口軟件，我們并不需要設(shè)置成為數(shù)據(jù)位9位，而是必須配置成數(shù)據(jù)位8位——當(dāng)然，在筆者下載的幾款串口工具軟件里均無法配置成數(shù)據(jù)9位。相應(yīng)的奇偶校驗(yàn)位需要與下位機(jī)相同即可。</p> <p>　　經(jīng)過以上的軟件配置，現(xiàn)在基于STM32F030芯片的通訊已經(jīng)工作正常了，我的經(jīng)驗(yàn)也暫時(shí)總結(jié)到這里了。</p></span>  <div class="9vfh9hh" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> 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