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<div class="title">Charlieplex.cpp</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/*</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Copyright (C) 2012 Southern Storm Software, Pty Ltd.</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * Permission is hereby granted, free of charge, to any person obtaining a</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * copy of this software and associated documentation files (the &quot;Software&quot;),</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * to deal in the Software without restriction, including without limitation</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * the rights to use, copy, modify, merge, publish, distribute, sublicense,</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * and/or sell copies of the Software, and to permit persons to whom the</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> * Software is furnished to do so, subject to the following conditions:</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * The above copyright notice and this permission notice shall be included</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * in all copies or substantial portions of the Software.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * THE SOFTWARE IS PROVIDED &quot;AS IS&quot;, WITHOUT WARRANTY OF ANY KIND, EXPRESS</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="comment"> * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="comment"> * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="comment"> * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="comment"> * DEALINGS IN THE SOFTWARE.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="preprocessor">#include &quot;Charlieplex.h&quot;</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>&#160;<span class="preprocessor">#if defined(ARDUINO) &amp;&amp; ARDUINO &gt;= 100</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;Arduino.h&gt;</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="preprocessor">#else</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;WProgram.h&gt;</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;</div>
<div class="line"><a name="l00121"></a><span class="lineno"><a class="line" href="classCharlieplex.html#abfb0d0456bcbadbf60c21f615adacdbd"> 121</a></span>&#160;<a class="code" href="classCharlieplex.html#abfb0d0456bcbadbf60c21f615adacdbd">Charlieplex::Charlieplex</a>(<span class="keyword">const</span> uint8_t *pins, uint8_t numPins)</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; : _count(((int)numPins) * (numPins - 1))</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; , _lastTime(micros())</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; , _currentIndex(-1)</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; , _pwmPhase(0xC0)</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160;{</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; <span class="comment">// Determine the best hold time for 50 Hz refresh when all LED&#39;s</span></div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; <span class="comment">// are lit. Divide it again by 4 (to get 200 Hz) to manage the</span></div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; <span class="comment">// simulated PWM in refresh().</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; _holdTime = 20000 / _count / 4;</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; <span class="comment">// Allocate the pin arrays and populate them. Doing this now makes</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; <span class="comment">// refresh() more efficient later, at the expense of some memory.</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; _pins1 = (uint8_t *)malloc(_count);</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; _pins2 = (uint8_t *)malloc(_count);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; <span class="keywordtype">int</span> n = 0;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; <span class="keywordflow">for</span> (uint8_t pass = 1; pass &lt; numPins; ++pass) {</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; <span class="keywordflow">for</span> (uint8_t pin = 0; pin &lt; (numPins - pass); ++pin) {</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; _pins1[n] = _pins2[n + 1] = pins[pin];</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; _pins2[n] = _pins1[n + 1] = pins[pin + pass];</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; n += 2;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; }</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160;</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; <span class="comment">// Allocate space for the LED value array and zero it.</span></div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; _values = (uint8_t *)malloc(_count);</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; memset(_values, 0, _count);</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160;</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; <span class="comment">// Start with all pins configured as floating inputs (all LED&#39;s off).</span></div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; <span class="keywordflow">for</span> (uint8_t pin = 0; pin &lt; numPins; ++pin) {</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; digitalWrite(pins[pin], LOW);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; pinMode(pins[pin], INPUT);</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; }</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160;}</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160;</div>
<div class="line"><a name="l00159"></a><span class="lineno"><a class="line" href="classCharlieplex.html#a4dbe37ccba8ba18139f4e710afdcd103"> 159</a></span>&#160;<a class="code" href="classCharlieplex.html#a4dbe37ccba8ba18139f4e710afdcd103">Charlieplex::~Charlieplex</a>()</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160;{</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; free(_pins1);</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; free(_pins2);</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; free(_values);</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160;}</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160;</div>
<div class="line"><a name="l00277"></a><span class="lineno"><a class="line" href="classCharlieplex.html#a8313edeacd8387c428b8299d52584d6a"> 277</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classCharlieplex.html#a8313edeacd8387c428b8299d52584d6a">Charlieplex::loop</a>()</div>
<div class="line"><a name="l00278"></a><span class="lineno"> 278</span>&#160;{</div>
<div class="line"><a name="l00279"></a><span class="lineno"> 279</span>&#160; <span class="keywordtype">unsigned</span> <span class="keywordtype">long</span> us = micros();</div>
<div class="line"><a name="l00280"></a><span class="lineno"> 280</span>&#160; <span class="keywordflow">if</span> ((us - _lastTime) &gt;= _holdTime) {</div>
<div class="line"><a name="l00281"></a><span class="lineno"> 281</span>&#160; _lastTime = us;</div>
<div class="line"><a name="l00282"></a><span class="lineno"> 282</span>&#160; <a class="code" href="classCharlieplex.html#a3c961bfff866e400dad371f0376f096b">refresh</a>();</div>
<div class="line"><a name="l00283"></a><span class="lineno"> 283</span>&#160; }</div>
<div class="line"><a name="l00284"></a><span class="lineno"> 284</span>&#160;}</div>
<div class="line"><a name="l00285"></a><span class="lineno"> 285</span>&#160;</div>
<div class="line"><a name="l00296"></a><span class="lineno"><a class="line" href="classCharlieplex.html#a3c961bfff866e400dad371f0376f096b"> 296</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="classCharlieplex.html#a3c961bfff866e400dad371f0376f096b">Charlieplex::refresh</a>()</div>
<div class="line"><a name="l00297"></a><span class="lineno"> 297</span>&#160;{</div>
<div class="line"><a name="l00298"></a><span class="lineno"> 298</span>&#160; <span class="comment">// Find the next LED to be lit.</span></div>
<div class="line"><a name="l00299"></a><span class="lineno"> 299</span>&#160; <span class="keywordtype">int</span> prevIndex = _currentIndex;</div>
<div class="line"><a name="l00300"></a><span class="lineno"> 300</span>&#160; <span class="keywordtype">int</span> limit = _count;</div>
<div class="line"><a name="l00301"></a><span class="lineno"> 301</span>&#160; <span class="keywordflow">while</span> (limit &gt;= 0) {</div>
<div class="line"><a name="l00302"></a><span class="lineno"> 302</span>&#160; _currentIndex = (_currentIndex + 1) % _count;</div>
<div class="line"><a name="l00303"></a><span class="lineno"> 303</span>&#160; <span class="keywordflow">if</span> (_values[_currentIndex] != 0)</div>
<div class="line"><a name="l00304"></a><span class="lineno"> 304</span>&#160; <span class="keywordflow">break</span>;</div>
<div class="line"><a name="l00305"></a><span class="lineno"> 305</span>&#160; --limit;</div>
<div class="line"><a name="l00306"></a><span class="lineno"> 306</span>&#160; }</div>
<div class="line"><a name="l00307"></a><span class="lineno"> 307</span>&#160; <span class="keywordflow">if</span> (limit &lt; 0) {</div>
<div class="line"><a name="l00308"></a><span class="lineno"> 308</span>&#160; <span class="comment">// No LED&#39;s are lit. Turn off the previous LED and exit.</span></div>
<div class="line"><a name="l00309"></a><span class="lineno"> 309</span>&#160; <span class="keywordflow">if</span> (prevIndex != -1) {</div>
<div class="line"><a name="l00310"></a><span class="lineno"> 310</span>&#160; digitalWrite(_pins1[prevIndex], LOW);</div>
<div class="line"><a name="l00311"></a><span class="lineno"> 311</span>&#160; digitalWrite(_pins2[prevIndex], LOW);</div>
<div class="line"><a name="l00312"></a><span class="lineno"> 312</span>&#160; pinMode(_pins1[prevIndex], INPUT);</div>
<div class="line"><a name="l00313"></a><span class="lineno"> 313</span>&#160; pinMode(_pins2[prevIndex], INPUT);</div>
<div class="line"><a name="l00314"></a><span class="lineno"> 314</span>&#160; }</div>
<div class="line"><a name="l00315"></a><span class="lineno"> 315</span>&#160; _currentIndex = -1;</div>
<div class="line"><a name="l00316"></a><span class="lineno"> 316</span>&#160; <span class="keywordflow">return</span>;</div>
<div class="line"><a name="l00317"></a><span class="lineno"> 317</span>&#160; }</div>
<div class="line"><a name="l00318"></a><span class="lineno"> 318</span>&#160;</div>
<div class="line"><a name="l00319"></a><span class="lineno"> 319</span>&#160; <span class="comment">// Light the current LED.</span></div>
<div class="line"><a name="l00320"></a><span class="lineno"> 320</span>&#160; uint8_t value = _values[_currentIndex];</div>
<div class="line"><a name="l00321"></a><span class="lineno"> 321</span>&#160; uint8_t pin1 = _pins1[_currentIndex];</div>
<div class="line"><a name="l00322"></a><span class="lineno"> 322</span>&#160; uint8_t pin2 = _pins2[_currentIndex];</div>
<div class="line"><a name="l00323"></a><span class="lineno"> 323</span>&#160; _pwmPhase += 0x40;</div>
<div class="line"><a name="l00324"></a><span class="lineno"> 324</span>&#160; <span class="keywordflow">if</span> (prevIndex != _currentIndex) {</div>
<div class="line"><a name="l00325"></a><span class="lineno"> 325</span>&#160; <span class="comment">// Turn off the previous LED.</span></div>
<div class="line"><a name="l00326"></a><span class="lineno"> 326</span>&#160; <span class="keywordflow">if</span> (prevIndex != -1) {</div>
<div class="line"><a name="l00327"></a><span class="lineno"> 327</span>&#160; digitalWrite(_pins1[prevIndex], LOW);</div>
<div class="line"><a name="l00328"></a><span class="lineno"> 328</span>&#160; digitalWrite(_pins2[prevIndex], LOW);</div>
<div class="line"><a name="l00329"></a><span class="lineno"> 329</span>&#160; pinMode(_pins1[prevIndex], INPUT);</div>
<div class="line"><a name="l00330"></a><span class="lineno"> 330</span>&#160; pinMode(_pins2[prevIndex], INPUT);</div>
<div class="line"><a name="l00331"></a><span class="lineno"> 331</span>&#160; }</div>
<div class="line"><a name="l00332"></a><span class="lineno"> 332</span>&#160;</div>
<div class="line"><a name="l00333"></a><span class="lineno"> 333</span>&#160; <span class="comment">// We simulate PWM using a phase counter because analogWrite()</span></div>
<div class="line"><a name="l00334"></a><span class="lineno"> 334</span>&#160; <span class="comment">// combined with holdTime() causes too much flickering if more</span></div>
<div class="line"><a name="l00335"></a><span class="lineno"> 335</span>&#160; <span class="comment">// than one LED is lit. This reduces the PWM resolution to 1 in 4.</span></div>
<div class="line"><a name="l00336"></a><span class="lineno"> 336</span>&#160; pinMode(pin1, OUTPUT);</div>
<div class="line"><a name="l00337"></a><span class="lineno"> 337</span>&#160; pinMode(pin2, OUTPUT);</div>
<div class="line"><a name="l00338"></a><span class="lineno"> 338</span>&#160; <span class="keywordflow">if</span> (value &gt; _pwmPhase)</div>
<div class="line"><a name="l00339"></a><span class="lineno"> 339</span>&#160; digitalWrite(pin1, HIGH);</div>
<div class="line"><a name="l00340"></a><span class="lineno"> 340</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00341"></a><span class="lineno"> 341</span>&#160; digitalWrite(pin1, LOW);</div>
<div class="line"><a name="l00342"></a><span class="lineno"> 342</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00343"></a><span class="lineno"> 343</span>&#160; <span class="comment">// Same LED as previous. Since there is only a single LED</span></div>
<div class="line"><a name="l00344"></a><span class="lineno"> 344</span>&#160; <span class="comment">// that is lit, we can use analogWrite() to set the PWM state.</span></div>
<div class="line"><a name="l00345"></a><span class="lineno"> 345</span>&#160; <span class="keywordflow">if</span> (value == 255)</div>
<div class="line"><a name="l00346"></a><span class="lineno"> 346</span>&#160; digitalWrite(pin1, HIGH);</div>
<div class="line"><a name="l00347"></a><span class="lineno"> 347</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00348"></a><span class="lineno"> 348</span>&#160; analogWrite(pin1, value);</div>
<div class="line"><a name="l00349"></a><span class="lineno"> 349</span>&#160; }</div>
<div class="line"><a name="l00350"></a><span class="lineno"> 350</span>&#160;}</div>
<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>
<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>
<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>
<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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