https://forge.codesys.com/forge/talk/CODESYS-V2/thread/58432f0b84/2020-02-27T19:50:04.316000ZRecent posts to External C code with an array with initial values?2020-02-27T19:50:04.316000Z2020-02-27T19:50:04.316000ZTobias Müllerhttps://forge.codesys.com/u/tobias-mueller/https://forge.codesys.combc0b9a94b07197711b3baf478ad176276ac9a2fa

<div class="markdown_content"><p>Hello,</p> <p>I successfully created an external library from a C source for C166. </p> <p>Basically it is running!</p> <p>Currently I have the following problem. I was not able to use a constant array with initial values that is defined in the C source. It seems that CoDeSys is pointing to a different memory address?!</p> <p>The following does not work:</p> <div class="codehilite"><pre><span></span><span class="err">\</span><span class="o">#</span><span class="n">pragma</span> <span class="k">class</span> <span class="n">hc</span><span class="o">=</span><span class="n">NCONST</span> <span class="n">huge</span> <span class="k">static</span> <span class="n">const</span> <span class="nb">int</span> <span class="n">aiTemp</span><span class="p">[]</span> <span class="o">=</span> <span class="err">{</span><span class="mi">0</span><span class="p">,</span> <span class="mi">11</span><span class="p">,</span> <span class="mi">22</span><span class="p">,</span> <span class="mi">33</span><span class="err">}</span><span class="p">;</span> <span class="err">\</span><span class="o">#</span><span class="n">pragma</span> <span class="n">default_attributes</span> </pre></div> <p>If e.g. aiTemp<span>[2]</span> is read the result is not "22"!</p> <p>A single global constant variable is working:</p> <div class="codehilite"><pre><span></span><span class="n">huge</span> <span class="k">static</span> <span class="n">const</span> <span class="n">iTemp</span> <span class="o">=</span> <span class="mi">55</span><span class="p">;</span> </pre></div> <p>I use the following classes file:</p> <div class="codehilite"><pre><span></span><span class="n">CLASSES</span> <span class="p">(</span> <span class="err"> </span> <span class="n">FUNCTABLE</span> <span class="p">(</span><span class="mi">40000</span><span class="n">h</span> <span class="k">to</span> <span class="mi">44</span><span class="n">BFFh</span><span class="p">),</span> <span class="err"> </span> <span class="n">CINITROM</span> <span class="err"> </span> <span class="n">CPROGRAM</span> <span class="err"> </span> <span class="n">NCONST</span><span class="err"> </span> <span class="err"> </span> <span class="err"> </span> <span class="err"> </span> <span class="err"> </span> <span class="n">SHAREDCLIB</span> <span class="err"> </span> <span class="n">SHAREDRTLIB</span> <span class="p">(</span><span class="mi">4</span><span class="n">C00h</span> <span class="k">to</span> <span class="mi">4</span><span class="n">FFFFh</span><span class="p">),</span> <span class="err"> </span> <span class="n">CNEAR</span> <span class="err"> </span> <span class="n">CUSTACK</span> <span class="p">(</span><span class="mi">120000</span><span class="n">H</span> <span class="k">to</span> <span class="mi">127</span><span class="n">FFFH</span><span class="p">)</span> <span class="p">)</span> </pre></div> <p><strong>Functable </strong>class contain the following:</p> <div class="codehilite"><pre><span></span><span class="n">huge</span> <span class="k">static</span> <span class="n">const</span> <span class="n">LibDesc</span> <span class="n">ld</span><span class="p">[</span><span class="mi">512</span><span class="p">]</span> <span class="o">=</span> <span class="err">{</span> <span class="p">...</span> <span class="err">}</span><span class="p">;</span> <span class="n">huge</span> <span class="k">static</span> <span class="n">unsigned</span> <span class="n">long</span> <span class="n">const</span> <span class="n">pLibCodeInit</span><span class="p">[]</span> <span class="o">=</span> <span class="err">{</span><span class="p">...</span><span class="err">}</span><span class="p">;</span> </pre></div> <p>Does anyone know what is needed to use arrays in CoDeSys V2.3 with inital values defined in C.</p> <p>Best regards</p> <p>Tobias Müller</p></div>