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<span id="contentlabels" style="font-size:14px;"><p>工程師們通常使用示波器觀(guān)察<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/CAN總線(xiàn)"><em>CAN總線(xiàn)</em></a>的信號質(zhì)量，一般主要關(guān)注<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/CAN總線(xiàn)"><em>CAN總線(xiàn)</em></a>差分信號的幅值、最小位寬、邊沿情況等。相信不少工程師都看到過(guò)一條報文數據的波形上高高低低存在多個(gè)幅值，心里可能會(huì )變得忐忑不安，幅值不統一是不是波形出現畸變了呢?其實(shí)并非如此，今天就把<a class="contentlabel" href="http://dyxdggzs.com/news/listbylabel/label/CAN總線(xiàn)"><em>CAN總線(xiàn)</em></a>上的幅值“異常”歸歸類(lèi)。</p>本文引用地址：<a href="http://dyxdggzs.com/article/201807/384622.htm">http://dyxdggzs.com/article/201807/384622.htm</a><p>一、CAN-bus信號產(chǎn)生原理</p><p>眾所周知，一個(gè)標準CAN節點(diǎn)由微處理器、控制器、收發(fā)器構成。多個(gè)節點(diǎn)成總線(xiàn)型架構掛在一起，兩個(gè)端節點(diǎn)上并有終端電阻。其結構簡(jiǎn)圖如下圖所示。</p><p></p><center><img src="http://uphotos.eepw.com.cn/fetch/20180719/384622_1_0.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></center><p>圖1 CAN-bus節點(diǎn)網(wǎng)絡(luò )結構</p><p>可以看出，與總線(xiàn)直接相連的是CAN節點(diǎn)的收發(fā)器，起內部電路等效如下圖所示，CAN-H、CAN-L直接由三極管驅動(dòng)，近似可以看成電流型輸出。結合上文所述網(wǎng)絡(luò )架構中的終端電阻，節點(diǎn)發(fā)出信號時(shí)電流流過(guò)終端電阻產(chǎn)生電壓信號，當同一時(shí)間多個(gè)節點(diǎn)同時(shí)發(fā)出信號時(shí)就會(huì )使總線(xiàn)上的電流高于單一節點(diǎn)發(fā)出的電流，使得我們觀(guān)察電壓信號時(shí)出現突增的現象。</p><p></p><center><img src="http://uphotos.eepw.com.cn/fetch/20180719/384622_1_1.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></center><p>圖2 CAN收發(fā)器結構</p><p>CAN-bus是總線(xiàn)型結構，通常狀態(tài)下一般只有一個(gè)節點(diǎn)占有總線(xiàn)。那么有幾種情況會(huì )導致多個(gè)節點(diǎn)同時(shí)發(fā)出，進(jìn)而導致幅值出現“異常”呢，下文通過(guò)致遠電子CANScope分析儀的幾個(gè)測試案例總結一下。</p><p>二、應答位上的幅值“異常”</p><p>最常見(jiàn)的，當CAN網(wǎng)絡(luò )上存在3個(gè)以上的節點(diǎn)時(shí)，應答位上的幅值要明顯高于同一報文的其他位置，如下圖所示?？梢钥吹綀笪脑贗D段、數據段、CRC校驗段處的幅值均比較一致，但是到應答位處時(shí)幅值出現突增。這是為什么呢，大家都知道CAN-bus總線(xiàn)擁有自動(dòng)應答機制，即當某一節點(diǎn)發(fā)送完一幀報文時(shí)，所有總線(xiàn)中的其余非只聽(tīng)節點(diǎn)均會(huì )在應答位處做出響應，如果報文被成功識別則發(fā)出一個(gè)顯性位做為應答信號。</p><p>結合上文所述，應答位此時(shí)CAN總線(xiàn)上的電流是若干節點(diǎn)電流疊加的綜合，所以應答位的幅值高就很容易講通了。</p><p></p><center><img src="http://uphotos.eepw.com.cn/fetch/20180719/384622_1_2.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></center><p>圖3 應答位上的幅值“異常”</p><p>三、ID段上的幅值“異常”</p><p>CAN-bus總線(xiàn)的一大特點(diǎn)就是多主結構，即網(wǎng)絡(luò )中所有節點(diǎn)功能對等，沒(méi)有主從機的概念，所有節點(diǎn)均可自由收發(fā)數據。保證多主結構得以實(shí)現的關(guān)鍵在于CAN總線(xiàn)的仲裁機制也稱(chēng)優(yōu)先級機制。當網(wǎng)絡(luò )中同時(shí)有多個(gè)節點(diǎn)同時(shí)發(fā)送數據時(shí)會(huì )在ID段處產(chǎn)生仲裁，優(yōu)先級高的節點(diǎn)會(huì )最終占有總線(xiàn)。</p><p>如下圖所示，可以看到在圖中的標記處波形出現了“臺階”。正是由于在“臺階”出現前有兩個(gè)節點(diǎn)同時(shí)發(fā)出數據，導致幅值增高，在“臺階”處某一節點(diǎn)由于優(yōu)先級高占有總線(xiàn)，另一個(gè)節點(diǎn)暫時(shí)退出，使得幅值又回歸平常。</p><p></p><center><img src="http://uphotos.eepw.com.cn/fetch/20180719/384622_1_3.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></center><p>圖4 ID段上的幅值異常</p><p>四、錯誤幀上的幅值“異常”</p><p>再看看這個(gè)案例，可以看到在波形的后半部分也出現了臺階式的幅值增高，光標卡住的顯性電平區間可以看到寬度明顯超過(guò)了5個(gè)標準位寬，按照CAN總線(xiàn)的位填充規則(不能存在連續六個(gè)相同的顯性位或隱性位)表明這是一條錯誤幀。但是不要誤會(huì )，并不是因為這個(gè)幅值“異常”而導致的錯誤幀，我們知道CAN總線(xiàn)有錯誤重發(fā)機制，以保證總線(xiàn)傳輸數據的可靠性。這種可靠性正式通過(guò)錯誤幀的“一票否決制”實(shí)現的。</p><p>當網(wǎng)絡(luò )中某一節點(diǎn)識別到一條認為是有問(wèn)題的報文后會(huì )發(fā)送六個(gè)連續的顯性位(即錯誤幀)，投出這一否決票通知網(wǎng)絡(luò )上所有其他節點(diǎn)，本條報文無(wú)效。此后其他節點(diǎn)會(huì )以“跟票”的形式全部發(fā)出六個(gè)顯性位錯誤幀。所以此時(shí)多個(gè)節點(diǎn)重疊部分的錯誤幀的幅值就會(huì )高一些了。</p><p></p><center><img src="http://uphotos.eepw.com.cn/fetch/20180719/384622_1_4.jpg" onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" /></center><p>圖5 錯誤幀上的幅值異常</p> </span>  <div class="6z27koq" 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 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