https://forge.codesys.com/forge/talk/Deutsch/thread/e34514a988/2021-07-11T11:44:17.641000ZRecent posts to Raspberry I2C Support CCS8112021-07-11T11:44:17.641000Z2021-07-11T11:44:17.641000Zmrpioneerhttps://forge.codesys.com/u/mrpioneer/https://forge.codesys.comce04e4cbf886b29629f00056b4108c02772051a3

<div class="markdown_content"><p>Hallo zusammen,</p> <p>ich versuche jetzt schon einige Tage einen CCS811 Sensor zum laufen zu bekommen.<br/> Datasheet: <a href="https://www.sciosense.com/wp-content/uploads/2020/01/SC-001232-DS-2-CCS811B-Datasheet-Revision-2.pdf" rel="nofollow">https://www.sciosense.com/wp-content/uploads/2020/01/SC-001232-DS-2-CCS811B-Datasheet-Revision-2.pdf</a><br/> Leider scheitere ich daran die Register zu beschreiben.<br/> Ich denke ich benötige an dieser Stelle Hilfe eines Profis.</p> <p>Die Slave Adresse lautet : slave address 0x5A;<br/> sudo i2cdetect -y 1 zeigt mir diese auch korrekt an.</p> <p>Nun möchte ich das Register 16#01 beschreiben mit Mode4.<br/> 0x01 MEAS_MODE R/W 1 byte Measurement mode and conditions register<br/> BIT 6:4 DRIVE_MODE<br/> 000: Mode 0 – Idle (Measurements are disabled in this mode)<br/> 001: Mode 1 – Constant power mode, IAQ measurement every second<br/> 010: Mode 2 – Pulse heating mode IAQ measurement every 10 seconds<br/> 011: Mode 3 – Low power pulse heating mode IAQ measurement every 60<br/> seconds<br/> 100: Mode 4 – Constant power mode, sensor measurement every 250ms<br/> 1xx: Reserved modes (For future use)<br/> Dies dürfte das BIT 6 des Registers 16#01 sein.</p> <p>Also 16#01 und 16#04.</p> <p>Danach möchte ich die Werte aus dem Register 0x02 auslesen.<br/> 0x02 ALG_RESULT_DATA R<br/> up to 8 bytes Algorithmresult.Themostsignificant 2bytes contain a<br/> ppmestimate ofthe equivalent CO2 (eCO2)level, and the next two bytes contain a ppb estimate ofthe total VOC level.</p> <p>Mein Gedanke hierzu war ich muss zuerst das Register 16#02 öffnen um es dann auslesen zu können.</p> <p>Hier ist mein Programm zu sehen bzw. was davon übrig ist.<br/> Über jegliche Hilfestellung würde ich mich sehr freuen.</p> <div class="codehilite"><pre><span></span><span class="nt">PROGRAM</span> <span class="nt">CO2</span> <span class="nt">VAR</span> <span class="nt">myInit</span><span class="o">:</span> <span class="nt">INT</span> <span class="o">:=</span> <span class="nt">0</span><span class="o">;</span> <span class="nt">buff</span><span class="o">:</span> <span class="nt">ARRAY</span> <span class="cp">[</span><span class="mi">0</span><span class="nx">..1</span><span class="cp">]</span> <span class="nt">OF</span> <span class="nt">BYTE</span> <span class="o">;</span> <span class="nt">inputB</span><span class="o">:</span> <span class="nt">BYTE</span><span class="o">;</span> <span class="nt">inputA</span><span class="o">:</span> <span class="nt">BYTE</span><span class="o">;</span> <span class="nt">nRead</span><span class="o">:</span> <span class="nt">DINT</span><span class="o">;</span> <span class="nt">value</span><span class="o">:</span> <span class="nt">BYTE</span><span class="o">;</span> <span class="nt">END_VAR</span> </pre></div> <div class="codehilite"><pre><span></span><span class="o">//</span><span class="k">Start</span> <span class="n">Register</span> <span class="mi">01</span><span class="p">,</span> <span class="nb">BIT</span> <span class="mi">6</span> <span class="n">schreiben</span> <span class="k">IF</span> <span class="n">myInit</span><span class="o">=</span><span class="mi">0</span> <span class="k">THEN</span> <span class="n">myInit</span> <span class="p">:</span><span class="o">=</span> <span class="mi">1</span><span class="p">;</span> <span class="o">//</span> <span class="n">IODIR_A</span> <span class="o">=</span> <span class="k">Output</span> <span class="n">buff</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="p">:</span><span class="o">=</span> <span class="mi">16</span><span class="o">#</span><span class="mi">01</span><span class="p">;</span> <span class="n">buff</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="p">:</span><span class="o">=</span> <span class="mi">16</span><span class="o">#</span><span class="mi">04</span><span class="p">;</span> <span class="n">I2C_master</span><span class="p">.</span><span class="k">write</span><span class="p">(</span><span class="mi">16</span><span class="o">#</span><span class="mi">5</span><span class="n">A</span><span class="p">,</span> <span class="n">ADR</span><span class="p">(</span><span class="n">buff</span><span class="p">),</span> <span class="mi">2</span><span class="p">);</span> <span class="n">END_IF</span> <span class="o">//</span><span class="n">Lesen</span> <span class="n">aus</span> <span class="n">Register</span> <span class="mi">16</span><span class="o">#</span><span class="mi">02</span> <span class="n">buff</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="p">:</span><span class="o">=</span> <span class="mi">16</span><span class="o">#</span><span class="mi">02</span><span class="p">;</span> <span class="n">I2C_master</span><span class="p">.</span><span class="k">write</span><span class="p">(</span><span class="mi">16</span><span class="o">#</span><span class="mi">5</span><span class="n">A</span><span class="p">,</span> <span class="n">ADR</span><span class="p">(</span><span class="n">buff</span><span class="p">),</span> <span class="mi">1</span><span class="p">);</span> <span class="n">nRead</span> <span class="p">:</span><span class="o">=</span> <span class="n">I2C_master</span><span class="p">.</span><span class="k">read</span><span class="p">(</span><span class="mi">16</span><span class="o">#</span><span class="mi">5</span><span class="n">A</span><span class="p">,</span> <span class="n">ADR</span><span class="p">(</span><span class="n">buff</span><span class="p">),</span> <span class="mi">2</span><span class="p">);</span> <span class="k">IF</span> <span class="p">(</span><span class="n">nRead</span> <span class="o">=</span> <span class="mi">2</span><span class="p">)</span> <span class="k">THEN</span> <span class="n">inputB</span> <span class="p">:</span><span class="o">=</span> <span class="n">buff</span><span class="p">[</span><span class="mi">0</span><span class="p">];</span> <span class="n">inputA</span> <span class="p">:</span><span class="o">=</span> <span class="n">buff</span><span class="p">[</span><span class="mi">1</span><span class="p">];</span> <span class="n">END_IF</span> </pre></div> </div>