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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_1586d320a3b1e622174530fde769cda9.html">BlinkLED</a></li> </ul>
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<div class="title">Charlieplex.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 "Charlieplex.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><span class="preprocessor">#include <stdlib.h></span></div>
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<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <string.h></span></div>
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<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> </div>
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<div class="line"><a name="l00121"></a><span class="lineno"><a class="line" href="classCharlieplex.html#abfb0d0456bcbadbf60c21f615adacdbd"> 121</a></span> <a class="code" href="classCharlieplex.html#abfb0d0456bcbadbf60c21f615adacdbd">Charlieplex::Charlieplex</a>(<span class="keyword">const</span> uint8_t *pins, uint8_t numPins)</div>
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<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  : _count(((int)numPins) * (numPins - 1))</div>
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<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  , _lastTime(micros())</div>
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<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  , _currentIndex(-1)</div>
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<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  , _pwmPhase(0xC0)</div>
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<div class="line"><a name="l00126"></a><span class="lineno"> 126</span> {</div>
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<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="comment">// Determine the best hold time for 50 Hz refresh when all LED's</span></div>
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<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  <span class="comment">// are lit. Divide it again by 4 (to get 200 Hz) to manage the</span></div>
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<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="comment">// simulated PWM in refresh().</span></div>
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<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  _holdTime = 20000 / _count / 4;</div>
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<div class="line"><a name="l00131"></a><span class="lineno"> 131</span> </div>
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<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="comment">// Allocate the pin arrays and populate them. Doing this now makes</span></div>
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<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="comment">// refresh() more efficient later, at the expense of some memory.</span></div>
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<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  _pins1 = (uint8_t *)malloc(_count);</div>
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<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  _pins2 = (uint8_t *)malloc(_count);</div>
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<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordtype">int</span> n = 0;</div>
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<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">for</span> (uint8_t pass = 1; pass < numPins; ++pass) {</div>
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<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">for</span> (uint8_t pin = 0; pin < (numPins - pass); ++pin) {</div>
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<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  _pins1[n] = _pins2[n + 1] = pins[pin];</div>
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<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  _pins2[n] = _pins1[n + 1] = pins[pin + pass];</div>
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<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  n += 2;</div>
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<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div>
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<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  }</div>
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<div class="line"><a name="l00144"></a><span class="lineno"> 144</span> </div>
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<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">// Allocate space for the LED value array and zero it.</span></div>
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<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  _values = (uint8_t *)malloc(_count);</div>
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<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  memset(_values, 0, _count);</div>
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<div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div>
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<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="comment">// Start with all pins configured as floating inputs (all LED's off).</span></div>
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<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">for</span> (uint8_t pin = 0; pin < numPins; ++pin) {</div>
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<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  digitalWrite(pins[pin], LOW);</div>
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<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  pinMode(pins[pin], INPUT);</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"> 155</span> </div>
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<div class="line"><a name="l00159"></a><span class="lineno"><a class="line" href="classCharlieplex.html#a4dbe37ccba8ba18139f4e710afdcd103"> 159</a></span> <a class="code" href="classCharlieplex.html#a4dbe37ccba8ba18139f4e710afdcd103">Charlieplex::~Charlieplex</a>()</div>
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<div class="line"><a name="l00160"></a><span class="lineno"> 160</span> {</div>
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<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>  free(_pins1);</div>
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<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>  free(_pins2);</div>
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<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>  free(_values);</div>
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<div class="line"><a name="l00164"></a><span class="lineno"> 164</span> }</div>
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<div class="line"><a name="l00165"></a><span class="lineno"> 165</span> </div>
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<div class="line"><a name="l00277"></a><span class="lineno"><a class="line" href="classCharlieplex.html#a8313edeacd8387c428b8299d52584d6a"> 277</a></span> <span class="keywordtype">void</span> <a class="code" href="classCharlieplex.html#a8313edeacd8387c428b8299d52584d6a">Charlieplex::loop</a>()</div>
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<div class="line"><a name="l00278"></a><span class="lineno"> 278</span> {</div>
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<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> us = micros();</div>
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<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">if</span> ((us - _lastTime) >= _holdTime) {</div>
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<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  _lastTime = us;</div>
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<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <a class="code" href="classCharlieplex.html#a3c961bfff866e400dad371f0376f096b">refresh</a>();</div>
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<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  }</div>
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<div class="line"><a name="l00284"></a><span class="lineno"> 284</span> }</div>
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<div class="line"><a name="l00285"></a><span class="lineno"> 285</span> </div>
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<div class="line"><a name="l00296"></a><span class="lineno"><a class="line" href="classCharlieplex.html#a3c961bfff866e400dad371f0376f096b"> 296</a></span> <span class="keywordtype">void</span> <a class="code" href="classCharlieplex.html#a3c961bfff866e400dad371f0376f096b">Charlieplex::refresh</a>()</div>
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<div class="line"><a name="l00297"></a><span class="lineno"> 297</span> {</div>
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<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  <span class="comment">// Find the next LED to be lit.</span></div>
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<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  <span class="keywordtype">int</span> prevIndex = _currentIndex;</div>
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<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  <span class="keywordtype">int</span> limit = _count;</div>
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<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>  <span class="keywordflow">while</span> (limit >= 0) {</div>
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<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  _currentIndex = (_currentIndex + 1) % _count;</div>
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<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>  <span class="keywordflow">if</span> (_values[_currentIndex] != 0)</div>
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<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>  <span class="keywordflow">break</span>;</div>
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<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>  --limit;</div>
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<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>  }</div>
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<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>  <span class="keywordflow">if</span> (limit < 0) {</div>
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<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>  <span class="comment">// No LED's are lit. Turn off the previous LED and exit.</span></div>
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<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>  <span class="keywordflow">if</span> (prevIndex != -1) {</div>
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<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>  digitalWrite(_pins1[prevIndex], LOW);</div>
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<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>  digitalWrite(_pins2[prevIndex], LOW);</div>
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<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>  pinMode(_pins1[prevIndex], INPUT);</div>
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<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>  pinMode(_pins2[prevIndex], INPUT);</div>
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<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>  }</div>
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<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>  _currentIndex = -1;</div>
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<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>  <span class="keywordflow">return</span>;</div>
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<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>  }</div>
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<div class="line"><a name="l00318"></a><span class="lineno"> 318</span> </div>
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<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>  <span class="comment">// Light the current LED.</span></div>
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<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>  uint8_t value = _values[_currentIndex];</div>
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<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>  uint8_t pin1 = _pins1[_currentIndex];</div>
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<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>  uint8_t pin2 = _pins2[_currentIndex];</div>
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<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>  _pwmPhase += 0x40;</div>
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<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>  <span class="keywordflow">if</span> (prevIndex != _currentIndex) {</div>
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<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>  <span class="comment">// Turn off the previous LED.</span></div>
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<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>  <span class="keywordflow">if</span> (prevIndex != -1) {</div>
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<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>  digitalWrite(_pins1[prevIndex], LOW);</div>
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<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>  digitalWrite(_pins2[prevIndex], LOW);</div>
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<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>  pinMode(_pins1[prevIndex], INPUT);</div>
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<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>  pinMode(_pins2[prevIndex], INPUT);</div>
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<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>  }</div>
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<div class="line"><a name="l00332"></a><span class="lineno"> 332</span> </div>
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<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>  <span class="comment">// We simulate PWM using a phase counter because analogWrite()</span></div>
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<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>  <span class="comment">// combined with holdTime() causes too much flickering if more</span></div>
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<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>  <span class="comment">// than one LED is lit. This reduces the PWM resolution to 1 in 4.</span></div>
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<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>  pinMode(pin1, OUTPUT);</div>
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<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>  pinMode(pin2, OUTPUT);</div>
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<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>  <span class="keywordflow">if</span> (value > _pwmPhase)</div>
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<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>  digitalWrite(pin1, HIGH);</div>
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<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>  digitalWrite(pin1, LOW);</div>
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<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>  } <span class="keywordflow">else</span> {</div>
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<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>  <span class="comment">// Same LED as previous. Since there is only a single LED</span></div>
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<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>  <span class="comment">// that is lit, we can use analogWrite() to set the PWM state.</span></div>
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<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>  <span class="keywordflow">if</span> (value == 255)</div>
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<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>  digitalWrite(pin1, HIGH);</div>
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<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>  <span class="keywordflow">else</span></div>
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<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>  analogWrite(pin1, value);</div>
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<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>  }</div>
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<div class="line"><a name="l00350"></a><span class="lineno"> 350</span> }</div>
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<div class="ttc" id="classCharlieplex_html_a4dbe37ccba8ba18139f4e710afdcd103"><div class="ttname"><a href="classCharlieplex.html#a4dbe37ccba8ba18139f4e710afdcd103">Charlieplex::~Charlieplex</a></div><div class="ttdeci">~Charlieplex()</div><div class="ttdoc">Destroys this charlieplexed array. </div><div class="ttdef"><b>Definition:</b> <a href="Charlieplex_8cpp_source.html#l00159">Charlieplex.cpp:159</a></div></div>
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<div class="ttc" id="classCharlieplex_html_abfb0d0456bcbadbf60c21f615adacdbd"><div class="ttname"><a href="classCharlieplex.html#abfb0d0456bcbadbf60c21f615adacdbd">Charlieplex::Charlieplex</a></div><div class="ttdeci">Charlieplex(const uint8_t *pins, uint8_t numPins)</div><div class="ttdoc">Constructs a new charliexplexing array where the output pins are specified by the numPins entries in ...</div><div class="ttdef"><b>Definition:</b> <a href="Charlieplex_8cpp_source.html#l00121">Charlieplex.cpp:121</a></div></div>
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<div class="ttc" id="classCharlieplex_html_a8313edeacd8387c428b8299d52584d6a"><div class="ttname"><a href="classCharlieplex.html#a8313edeacd8387c428b8299d52584d6a">Charlieplex::loop</a></div><div class="ttdeci">void loop()</div><div class="ttdoc">Runs the multiplexing loop, to display the LED states on the charlieplexed array. ...</div><div class="ttdef"><b>Definition:</b> <a href="Charlieplex_8cpp_source.html#l00277">Charlieplex.cpp:277</a></div></div>
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<div class="ttc" id="classCharlieplex_html_a3c961bfff866e400dad371f0376f096b"><div class="ttname"><a href="classCharlieplex.html#a3c961bfff866e400dad371f0376f096b">Charlieplex::refresh</a></div><div class="ttdeci">void refresh()</div><div class="ttdoc">Refreshes the charlieplexed array by advancing to the next LED that needs to be lit. </div><div class="ttdef"><b>Definition:</b> <a href="Charlieplex_8cpp_source.html#l00296">Charlieplex.cpp:296</a></div></div>
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