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q-show="isShow"></div></nav><div id="wrapper" class="body-wrap"><div class="menu-l"><div class="canvas-wrap"><canvas data-colors="#eaeaea" data-sectionheight="100" data-contentid="js-content" id="myCanvas1" class="anm-canvas"></canvas></div><div id="js-content" class="content-ll"><article id="post-IIC通讯协议" class="article article-type-post" itemscope itemprop="blogPost"><div class="article-inner"><header class="article-header"><h1 class="article-title" itemprop="name">IIC通讯协议</h1><span id="busuanzi_container_page_pv" style="display:none" class="archive-article-date"><i class="icon-smile icon"></i> 阅读数：<span id="busuanzi_value_page_pv"></span>次 </span><a href="/IIC%E9%80%9A%E8%AE%AF%E5%8D%8F%E8%AE%AE.html" class="archive-article-date"><time datetime="2020-07-03T04:48:10.000Z" itemprop="datePublished"><i class="icon-calendar icon"></i>2020-07-03</time></a><div style="margin-top:10px"><span class="post-time"><span class="post-meta-item-icon"><i class="icon-statistics"></i> <span class="post-meta-item-text">字数统计:</span> <span class="post-count">645字</span> </span></span><span class="post-time"> | <span class="post-meta-item-icon"><i class="icon-book icon"></i> <span class="post-meta-item-text">阅读时长≈</span> <span class="post-count">2分</span></span></span></div></header><div class="article-entry" itemprop="articleBody"><h1 id="IIC通讯协议"><a href="#IIC通讯协议" class="headerlink" title="IIC通讯协议"></a>IIC通讯协议</h1><p>简单介绍下<code>IIC</code>的通讯时序，然后给出51单片机实现的代码。</p><a id="more"></a><h1 id="1-通讯协议"><a href="#1-通讯协议" class="headerlink" title="1. 通讯协议"></a>1. 通讯协议</h1><p><code>IIC</code>总线在传送数据过程中有三种类型信号，分别是：开始信号、结束信号和应答信号。</p><ul><li>开始信号：<code>SCL</code>为高电平时，<code>SDA</code>由高电平向低电平跳变，开始传送数据。</li><li>结束信号：<code>SCL</code>为高电平时，<code>SDA</code>由低电平向高电平跳变，结束传送数据。</li><li>应答信号：接收数据的<code>IC</code>在接收到<code>8bit</code>数据后，向发送数据的<code>IC</code>发出特定的低电平脉冲，表示已收到数据。<code>CPU</code>向受控单元发出一个信号后，等待受控单元发出一个应答信号，<code>CPU</code>接收到应答信号后，根据实际情况做出是否继续传递信号的判断。若未接收到应答信号，则判断为受控单元出现故障。</li></ul><p><code>IIC</code>总线时序图片如下。</p><p><img src="https://i.loli.net/2020/07/03/sLBifAI9etqoDcu.png" alt="IIC总线时序图"></p><h1 id="2-51单片机程序代码"><a href="#2-51单片机程序代码" class="headerlink" title="2. 51单片机程序代码"></a>2. 51单片机程序代码</h1><h2 id="2-1-使用的IO口"><a href="#2-1-使用的IO口" class="headerlink" title="2.1 使用的IO口"></a>2.1 使用的IO口</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//---定义IIC接口---//</span></span><br><span class="line">sbit IIC_SCL = P2^<span class="number">1</span>;</span><br><span class="line">sbit IIC_SDA = P2^<span class="number">0</span>;</span><br></pre></td></tr></table></figure><h2 id="2-2-延时函数"><a href="#2-2-延时函数" class="headerlink" title="2.2 延时函数"></a>2.2 延时函数</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**************************************</span></span><br><span class="line"><span class="comment">延时4微秒(STC89C51，晶振频率12MHz)</span></span><br><span class="line"><span class="comment">不同的单片机,需要调整此函数</span></span><br><span class="line"><span class="comment">**************************************/</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">Delay_4us</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> _nop_();</span><br><span class="line"> _nop_();</span><br><span class="line"> _nop_();</span><br><span class="line"> _nop_();</span><br><span class="line">}</span><br></pre></td></tr></table></figure><h2 id="2-3-IIC驱动代码"><a href="#2-3-IIC驱动代码" class="headerlink" title="2.3 IIC驱动代码"></a>2.3 IIC驱动代码</h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/*******************************************************************************</span></span><br><span class="line"><span class="comment">* 函数名 : IIC_Start</span></span><br><span class="line"><span class="comment">* 功能 : IIC启动信号</span></span><br><span class="line"><span class="comment">* 输入 : 无</span></span><br><span class="line"><span class="comment">* 输出 : 无</span></span><br><span class="line"><span class="comment">*******************************************************************************/</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">IIC_Start</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> IIC_SDA = <span class="number">1</span>;</span><br><span class="line"> IIC_SCL = <span class="number">1</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SDA = <span class="number">0</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*******************************************************************************</span></span><br><span class="line"><span class="comment">* 函数名 : IIC_Stop</span></span><br><span class="line"><span class="comment">* 功能 : IIC停止信号</span></span><br><span class="line"><span class="comment">* 输入 : 无</span></span><br><span class="line"><span class="comment">* 输出 : 无</span></span><br><span class="line"><span class="comment">*******************************************************************************/</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">IIC_Stop</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line"> IIC_SDA = <span class="number">0</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SCL = <span class="number">1</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SDA = <span class="number">1</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*******************************************************************************</span></span><br><span class="line"><span class="comment">* 函数名 : IIC_WaitAck</span></span><br><span class="line"><span class="comment">* 功能 : 等待Ack应答</span></span><br><span class="line"><span class="comment">* 输入 : 无</span></span><br><span class="line"><span class="comment">* 输出 : BYTE 1接收应答失败 0接收应答成功</span></span><br><span class="line"><span class="comment">*******************************************************************************/</span></span><br><span class="line"><span class="function">BYTE <span class="title">IIC_WaitAck</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> BYTE errtime = <span class="number">0</span>;</span><br><span class="line"> IIC_SDA = <span class="number">1</span>;</span><br><span class="line"> _nop_();</span><br><span class="line"> IIC_SCL = <span class="number">1</span>;</span><br><span class="line"> _nop_();</span><br><span class="line"></span><br><span class="line"> <span class="keyword">while</span> (IIC_SDA)</span><br><span class="line"> {</span><br><span class="line"> errtime++;</span><br><span class="line"> <span class="keyword">if</span>(errtime><span class="number">250</span>)</span><br><span class="line"> { </span><br><span class="line"> IIC_Stop();</span><br><span class="line"> <span class="keyword">return</span> <span class="number">1</span>;</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"></span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*******************************************************************************</span></span><br><span class="line"><span class="comment">* 函数名 : IIC_Ack</span></span><br><span class="line"><span class="comment">* 功能 : 产生Ack应答</span></span><br><span class="line"><span class="comment">* 输入 : 无</span></span><br><span class="line"><span class="comment">* 输出 : 无</span></span><br><span class="line"><span class="comment">*******************************************************************************/</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">IIC_Ack</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SDA = <span class="number">0</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SCL = <span class="number">1</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*******************************************************************************</span></span><br><span class="line"><span class="comment">* 函数名 : IIC_nAck</span></span><br><span class="line"><span class="comment">* 功能 : 不产生Ack应答</span></span><br><span class="line"><span class="comment">* 输入 : 无</span></span><br><span class="line"><span class="comment">* 输出 : 无</span></span><br><span class="line"><span class="comment">*******************************************************************************/</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">IIC_nAck</span><span class="params">(<span class="keyword">void</span>)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SDA = <span class="number">1</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SCL = <span class="number">1</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"><span class="comment">/*******************************************************************************</span></span><br><span class="line"><span class="comment">* 函数名 : IIC_Send_Byte</span></span><br><span class="line"><span class="comment">* 功能 : 发送一个字节</span></span><br><span class="line"><span class="comment">* 输入 : BYTE dat</span></span><br><span class="line"><span class="comment">* 输出 : 无</span></span><br><span class="line"><span class="comment">*******************************************************************************/</span></span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">IIC_Send_Byte</span><span class="params">(BYTE dat)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> BYTE t = <span class="number">0</span>;</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">for</span>(t=<span class="number">0</span>;t<<span class="number">8</span>;t++)</span><br><span class="line"> {</span><br><span class="line"> IIC_SDA = ((dat&<span class="number">0x80</span>)>><span class="number">7</span>);</span><br><span class="line"> dat <<= <span class="number">1</span>;</span><br><span class="line"> _nop_();</span><br><span class="line"> IIC_SCL = <span class="number">1</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line"> }</span><br><span class="line">}</span><br><span class="line"></span><br><span class="line"><span class="comment">/*******************************************************************************</span></span><br><span class="line"><span class="comment">* 函数名 : IIC_Read_Byte</span></span><br><span class="line"><span class="comment">* 功能 : 读取一个字节</span></span><br><span class="line"><span class="comment">* 输入 : BYTE ack 1为发送ACK 0为发送nACK</span></span><br><span class="line"><span class="comment">* 输出 : BYTE</span></span><br><span class="line"><span class="comment">*******************************************************************************/</span></span><br><span class="line"><span class="function">BYTE <span class="title">IIC_Read_Byte</span><span class="params">(BYTE ack)</span></span></span><br><span class="line"><span class="function"></span>{</span><br><span class="line"> BYTE i,receive = <span class="number">0</span>;</span><br><span class="line"> <span class="keyword">for</span>(i=<span class="number">0</span>;i<<span class="number">8</span>;i++)</span><br><span class="line"> {</span><br><span class="line"> IIC_SCL = <span class="number">0</span>;</span><br><span class="line"> Delay_4us();</span><br><span class="line"> IIC_SCL = <span class="number">1</span>;</span><br><span class="line"> receive <<= <span class="number">1</span>;</span><br><span class="line"> <span class="keyword">if</span>(IIC_SDA==<span class="number">1</span>)</span><br><span class="line"> {</span><br><span class="line"> receive++;</span><br><span class="line"> }</span><br><span class="line"> Delay_4us();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">if</span>(ack)</span><br><span class="line"> {</span><br><span class="line"> IIC_Ack();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">else</span></span><br><span class="line"> {</span><br><span class="line"> IIC_nAck();</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> receive;</span><br><span class="line">}</span><br></pre></td></tr></table></figure><div class="declare"><ul class="post-copyright"><li><strong>本文作者：</strong> 路痴的兔子</li><li><strong>本文链接：</strong> <a href="https:/proudrabbit.gitee.io/IIC通讯协议.html" title="IIC通讯协议" target="_blank">https:/proudrabbit.gitee.io/IIC通讯协议.html</a></li><li><strong>版权声明： </strong>本博客所有文章除特别声明外，均采用 <a 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href="javascript:void(0)" class="js-tag color5">编程语言</a></li><div class="clearfix"></div></ul></div><ul class="search-ul"><p q-show="jsonFail" style="padding:20px;font-size:12px">缺失模块。<br>1、请确保node版本大于6.2<br>2、在博客根目录（注意不是yilia-plus根目录）执行以下命令：<br>npm i hexo-generator-json-content --save<br><br>3、在根目录_config.yml里添加配置：<pre style="font-size:12px" q-show="jsonFail">
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pages: false
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text: false
raw: false
content: false
slug: false
updated: false
comments: false
link: false
permalink: false
excerpt: false
categories: false
tags: true
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