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<li class="navelem"><a class="el" href="dir_bc0718b08fb2015b8e59c47b2805f60c.html">libraries</a></li><li class="navelem"><a class="el" href="dir_f9b96888882c2691b8eeaeafd1b9501d.html">I2C</a></li> </ul>
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<div class="title">SoftI2C.cpp</div> </div>
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<div class="contents">
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div>
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<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Copyright (C) 2012 Southern Storm Software, Pty Ltd.</span></div>
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<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span></div>
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<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * copy of this software and associated documentation files (the "Software"),</span></div>
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<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * to deal in the Software without restriction, including without limitation</span></div>
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<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span></div>
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<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span></div>
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<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Software is furnished to do so, subject to the following conditions:</span></div>
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<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * The above copyright notice and this permission notice shall be included</span></div>
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<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * in all copies or substantial portions of the Software.</span></div>
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<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> *</span></div>
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<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS</span></div>
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<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
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<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
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<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
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<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span></div>
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<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
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<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> * DEALINGS IN THE SOFTWARE.</span></div>
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<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment"> */</span></div>
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<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div>
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<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include "SoftI2C.h"</span></div>
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<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#if defined(ARDUINO) && ARDUINO >= 100</span></div>
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<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor"></span><span class="preprocessor">#include <Arduino.h></span></div>
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<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#else</span></div>
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<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor"></span><span class="preprocessor">#include <WProgram.h></span></div>
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<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#endif</span></div>
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<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#define i2cDelay() delayMicroseconds(5)</span></div>
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<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00050"></a><span class="lineno"><a class="line" href="classSoftI2C.html#adb6e00ee3f930f1d32010a18feb5f6cc"> 50</a></span> <a class="code" href="classSoftI2C.html#adb6e00ee3f930f1d32010a18feb5f6cc">SoftI2C::SoftI2C</a>(uint8_t dataPin, uint8_t clockPin)</div>
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<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  : _dataPin(dataPin)</div>
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<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  , _clockPin(clockPin)</div>
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<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>  , started(false)</div>
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<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  , acked(true)</div>
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<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  , inWrite(false)</div>
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<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  , readCount(0)</div>
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<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> {</div>
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<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="comment">// Initially set the CLOCK and DATA lines to be outputs in the high state.</span></div>
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<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  pinMode(_clockPin, OUTPUT);</div>
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<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>  pinMode(_dataPin, OUTPUT);</div>
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<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  digitalWrite(_clockPin, HIGH);</div>
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<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  digitalWrite(_dataPin, HIGH);</div>
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<div class="line"><a name="l00063"></a><span class="lineno"> 63</span> }</div>
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<div class="line"><a name="l00064"></a><span class="lineno"> 64</span> </div>
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<div class="line"><a name="l00065"></a><span class="lineno"><a class="line" href="classSoftI2C.html#aad488669f28f6a5a4ceaae3de61d38f4"> 65</a></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classSoftI2C.html#aad488669f28f6a5a4ceaae3de61d38f4">SoftI2C::maxTransferSize</a>()<span class="keyword"> const</span></div>
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<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="keyword"></span>{</div>
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<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">return</span> 0xFFFF;</div>
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<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> }</div>
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<div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div>
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<div class="line"><a name="l00070"></a><span class="lineno"> 70</span> <span class="keywordtype">void</span> SoftI2C::start()</div>
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<div class="line"><a name="l00071"></a><span class="lineno"> 71</span> {</div>
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<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  pinMode(_dataPin, OUTPUT);</div>
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<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">if</span> (started) {</div>
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<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="comment">// Already started, so send a restart condition.</span></div>
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<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  digitalWrite(_dataPin, HIGH);</div>
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<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  digitalWrite(_clockPin, HIGH);</div>
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<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  i2cDelay();</div>
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<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  }</div>
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<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  digitalWrite(_dataPin, LOW);</div>
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<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  i2cDelay();</div>
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<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  digitalWrite(_clockPin, LOW);</div>
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<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  i2cDelay();</div>
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<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  started = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  acked = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00085"></a><span class="lineno"> 85</span> }</div>
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<div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div>
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<div class="line"><a name="l00087"></a><span class="lineno"> 87</span> <span class="keywordtype">void</span> SoftI2C::stop()</div>
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<div class="line"><a name="l00088"></a><span class="lineno"> 88</span> {</div>
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<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  pinMode(_dataPin, OUTPUT);</div>
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<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  digitalWrite(_dataPin, LOW);</div>
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<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  digitalWrite(_clockPin, HIGH);</div>
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<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  i2cDelay();</div>
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<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  digitalWrite(_dataPin, HIGH);</div>
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<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  i2cDelay();</div>
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<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  started = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  inWrite = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00097"></a><span class="lineno"> 97</span> }</div>
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<div class="line"><a name="l00098"></a><span class="lineno"> 98</span> </div>
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<div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="preprocessor">#define I2C_WRITE 0x00</span></div>
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<div class="line"><a name="l00100"></a><span class="lineno"> 100</span> <span class="preprocessor"></span><span class="preprocessor">#define I2C_WRITE10 0xF0</span></div>
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<div class="line"><a name="l00101"></a><span class="lineno"> 101</span> <span class="preprocessor"></span><span class="preprocessor">#define I2C_READ 0x01</span></div>
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<div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="preprocessor"></span><span class="preprocessor">#define I2C_READ10 0xF1</span></div>
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<div class="line"><a name="l00103"></a><span class="lineno"> 103</span> <span class="preprocessor"></span></div>
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<div class="line"><a name="l00104"></a><span class="lineno"><a class="line" href="classSoftI2C.html#aa8a3219f4e6ff52306cc3c219f37d8f9"> 104</a></span> <span class="keywordtype">void</span> <a class="code" href="classSoftI2C.html#aa8a3219f4e6ff52306cc3c219f37d8f9">SoftI2C::startWrite</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> address)</div>
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<div class="line"><a name="l00105"></a><span class="lineno"> 105</span> {</div>
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<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  start();</div>
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<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  inWrite = <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  <span class="keywordflow">if</span> (address < 0x80) {</div>
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<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  <span class="comment">// 7-bit address.</span></div>
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<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <a class="code" href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73">write</a>((uint8_t)((address << 1) | I2C_WRITE));</div>
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<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="comment">// 10-bit address.</span></div>
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<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <a class="code" href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73">write</a>((uint8_t)(((address >> 7) & 0x06)) | I2C_WRITE10);</div>
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<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <a class="code" href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73">write</a>((uint8_t)address);</div>
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<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  }</div>
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<div class="line"><a name="l00116"></a><span class="lineno"> 116</span> }</div>
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<div class="line"><a name="l00117"></a><span class="lineno"> 117</span> </div>
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<div class="line"><a name="l00118"></a><span class="lineno"><a class="line" href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73"> 118</a></span> <span class="keywordtype">void</span> <a class="code" href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73">SoftI2C::write</a>(uint8_t value)</div>
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<div class="line"><a name="l00119"></a><span class="lineno"> 119</span> {</div>
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<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  uint8_t mask = 0x80;</div>
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<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">while</span> (mask != 0) {</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  writeBit((value & mask) != 0);</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  mask >>= 1;</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  }</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (readBit()) <span class="comment">// 0: ACK, 1: NACK</span></div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  acked = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span> }</div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span> </div>
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<div class="line"><a name="l00129"></a><span class="lineno"><a class="line" href="classSoftI2C.html#aa12ae82813598b2e9ea70463c23c5bf3"> 129</a></span> <span class="keywordtype">bool</span> <a class="code" href="classSoftI2C.html#aa12ae82813598b2e9ea70463c23c5bf3">SoftI2C::endWrite</a>()</div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span> {</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  stop();</div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">return</span> acked;</div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span> }</div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span> </div>
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<div class="line"><a name="l00135"></a><span class="lineno"><a class="line" href="classSoftI2C.html#aa0dafc067cfa374af75e060dca647ec3"> 135</a></span> <span class="keywordtype">bool</span> <a class="code" href="classSoftI2C.html#aa0dafc067cfa374af75e060dca647ec3">SoftI2C::startRead</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> address, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> count)</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span> {</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  start();</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  inWrite = <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">if</span> (address < 0x80) {</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  <span class="comment">// 7-bit address.</span></div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <a class="code" href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73">write</a>((uint8_t)((address << 1) | I2C_READ));</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="comment">// 10-bit address.</span></div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  <a class="code" href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73">write</a>((uint8_t)(((address >> 7) & 0x06)) | I2C_READ10);</div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <a class="code" href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73">write</a>((uint8_t)address);</div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  }</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">if</span> (!acked) {</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  readCount = 0;</div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  }</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  readCount = count;</div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
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<div class="line"><a name="l00153"></a><span class="lineno"> 153</span> }</div>
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<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> </div>
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<div class="line"><a name="l00155"></a><span class="lineno"><a class="line" href="classSoftI2C.html#a849af91018caedbb82e83f02c543305e"> 155</a></span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> <a class="code" href="classSoftI2C.html#a849af91018caedbb82e83f02c543305e">SoftI2C::available</a>()</div>
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<div class="line"><a name="l00156"></a><span class="lineno"> 156</span> {</div>
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<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>  <span class="keywordflow">return</span> readCount;</div>
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<div class="line"><a name="l00158"></a><span class="lineno"> 158</span> }</div>
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<div class="line"><a name="l00159"></a><span class="lineno"> 159</span> </div>
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<div class="line"><a name="l00160"></a><span class="lineno"><a class="line" href="classSoftI2C.html#a330dbba5b726fa161a6b01a9ca49e1bc"> 160</a></span> uint8_t <a class="code" href="classSoftI2C.html#a330dbba5b726fa161a6b01a9ca49e1bc">SoftI2C::read</a>()</div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span> {</div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  uint8_t value = 0;</div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  <span class="keywordflow">for</span> (uint8_t bit = 0; bit < 8; ++bit)</div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>  value = (value << 1) | readBit();</div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordflow">if</span> (readCount > 1) {</div>
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<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="comment">// More bytes left to read - send an ACK.</span></div>
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<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  writeBit(<span class="keyword">false</span>);</div>
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<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>  --readCount;</div>
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<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  <span class="comment">// Last byte - send the NACK and a stop condition.</span></div>
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<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>  writeBit(<span class="keyword">true</span>);</div>
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<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  stop();</div>
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<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  readCount = 0;</div>
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<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  }</div>
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<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>  <span class="keywordflow">return</span> value;</div>
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<div class="line"><a name="l00176"></a><span class="lineno"> 176</span> }</div>
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<div class="line"><a name="l00177"></a><span class="lineno"> 177</span> </div>
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<div class="line"><a name="l00178"></a><span class="lineno"> 178</span> <span class="keywordtype">void</span> SoftI2C::writeBit(<span class="keywordtype">bool</span> bit)</div>
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<div class="line"><a name="l00179"></a><span class="lineno"> 179</span> {</div>
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<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  pinMode(_dataPin, OUTPUT);</div>
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<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  <span class="keywordflow">if</span> (bit)</div>
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<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  digitalWrite(_dataPin, HIGH);</div>
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<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  digitalWrite(_dataPin, LOW);</div>
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<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  i2cDelay();</div>
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<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  digitalWrite(_clockPin, HIGH);</div>
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<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  i2cDelay();</div>
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<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  digitalWrite(_clockPin, LOW);</div>
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<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  i2cDelay();</div>
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<div class="line"><a name="l00190"></a><span class="lineno"> 190</span> }</div>
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<div class="line"><a name="l00191"></a><span class="lineno"> 191</span> </div>
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<div class="line"><a name="l00192"></a><span class="lineno"> 192</span> <span class="keywordtype">bool</span> SoftI2C::readBit()</div>
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<div class="line"><a name="l00193"></a><span class="lineno"> 193</span> {</div>
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<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  pinMode(_dataPin, INPUT);</div>
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<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  digitalWrite(_dataPin, HIGH);</div>
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<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  digitalWrite(_clockPin, HIGH);</div>
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<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  <span class="keywordtype">bool</span> bit = digitalRead(_dataPin);</div>
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<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  i2cDelay();</div>
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<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  digitalWrite(_clockPin, LOW);</div>
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<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  i2cDelay();</div>
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<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  <span class="keywordflow">return</span> bit;</div>
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<div class="line"><a name="l00202"></a><span class="lineno"> 202</span> }</div>
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<div class="ttc" id="classSoftI2C_html_aa0dafc067cfa374af75e060dca647ec3"><div class="ttname"><a href="classSoftI2C.html#aa0dafc067cfa374af75e060dca647ec3">SoftI2C::startRead</a></div><div class="ttdeci">bool startRead(unsigned int address, unsigned int count)</div><div class="ttdoc">Starts a read operation for count bytes by sending the start condition and the I2C control byte...</div><div class="ttdef"><b>Definition:</b> <a href="SoftI2C_8cpp_source.html#l00135">SoftI2C.cpp:135</a></div></div>
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<div class="ttc" id="classSoftI2C_html_aa12ae82813598b2e9ea70463c23c5bf3"><div class="ttname"><a href="classSoftI2C.html#aa12ae82813598b2e9ea70463c23c5bf3">SoftI2C::endWrite</a></div><div class="ttdeci">bool endWrite()</div><div class="ttdoc">Ends the current write operation. </div><div class="ttdef"><b>Definition:</b> <a href="SoftI2C_8cpp_source.html#l00129">SoftI2C.cpp:129</a></div></div>
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<div class="ttc" id="classSoftI2C_html_adb6e00ee3f930f1d32010a18feb5f6cc"><div class="ttname"><a href="classSoftI2C.html#adb6e00ee3f930f1d32010a18feb5f6cc">SoftI2C::SoftI2C</a></div><div class="ttdeci">SoftI2C(uint8_t dataPin, uint8_t clockPin)</div><div class="ttdoc">Constructs a new software I2C master on dataPin and clockPin. </div><div class="ttdef"><b>Definition:</b> <a href="SoftI2C_8cpp_source.html#l00050">SoftI2C.cpp:50</a></div></div>
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<div class="ttc" id="classSoftI2C_html_a849af91018caedbb82e83f02c543305e"><div class="ttname"><a href="classSoftI2C.html#a849af91018caedbb82e83f02c543305e">SoftI2C::available</a></div><div class="ttdeci">unsigned int available()</div><div class="ttdoc">Returns the number of bytes that are still available for reading. </div><div class="ttdef"><b>Definition:</b> <a href="SoftI2C_8cpp_source.html#l00155">SoftI2C.cpp:155</a></div></div>
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<div class="ttc" id="classSoftI2C_html_a330dbba5b726fa161a6b01a9ca49e1bc"><div class="ttname"><a href="classSoftI2C.html#a330dbba5b726fa161a6b01a9ca49e1bc">SoftI2C::read</a></div><div class="ttdeci">uint8_t read()</div><div class="ttdoc">Reads a single byte from the I2C bus. </div><div class="ttdef"><b>Definition:</b> <a href="SoftI2C_8cpp_source.html#l00160">SoftI2C.cpp:160</a></div></div>
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<div class="ttc" id="classSoftI2C_html_ab46f0b6363c9cfe6fb3ab907956d5d73"><div class="ttname"><a href="classSoftI2C.html#ab46f0b6363c9cfe6fb3ab907956d5d73">SoftI2C::write</a></div><div class="ttdeci">void write(uint8_t value)</div><div class="ttdoc">Writes a single byte value on the I2C bus. </div><div class="ttdef"><b>Definition:</b> <a href="SoftI2C_8cpp_source.html#l00118">SoftI2C.cpp:118</a></div></div>
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<div class="ttc" id="classSoftI2C_html_aad488669f28f6a5a4ceaae3de61d38f4"><div class="ttname"><a href="classSoftI2C.html#aad488669f28f6a5a4ceaae3de61d38f4">SoftI2C::maxTransferSize</a></div><div class="ttdeci">unsigned int maxTransferSize() const </div><div class="ttdoc">Returns the maximum number of bytes that can be read or written in a single request by this bus maste...</div><div class="ttdef"><b>Definition:</b> <a href="SoftI2C_8cpp_source.html#l00065">SoftI2C.cpp:65</a></div></div>
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<div class="ttc" id="classSoftI2C_html_aa8a3219f4e6ff52306cc3c219f37d8f9"><div class="ttname"><a href="classSoftI2C.html#aa8a3219f4e6ff52306cc3c219f37d8f9">SoftI2C::startWrite</a></div><div class="ttdeci">void startWrite(unsigned int address)</div><div class="ttdoc">Starts a write operation by sending a start condition and the I2C control byte. </div><div class="ttdef"><b>Definition:</b> <a href="SoftI2C_8cpp_source.html#l00104">SoftI2C.cpp:104</a></div></div>
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