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<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D">Hi Patrick:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D">
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D"> The open-loop in this context is more likely to set duty of PWM manually.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D"> For example, when reading a sensor above or below a certain pre-defined temperature, then the duty of a PWM is revved up or lower to the desired fan-speed.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D"> More likely, PWM is set simply by the reading of a temperature sensor. A map of temperature readings and PWM values can be represented as an example.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D">Thank you,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-family:"Calibri",sans-serif;color:#1F497D">Derek<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Patrick Venture <venture@google.com>
<br>
<b>Sent:</b> Tuesday, July 16, 2019 1:02 AM<br>
<b>To:</b> Derek Lin23 <dlin23@lenovo.com>; James Feist <james.feist@linux.intel.com><br>
<b>Cc:</b> Yonghui YH21 Liu <liuyh21@lenovo.com>; Harry Sung1 <hsung1@lenovo.com>; OpenBMC Maillist <openbmc@lists.ozlabs.org><br>
<b>Subject:</b> [External] Re: Questions regarding of phosphor-pid-control<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">On Tue, Jul 9, 2019 at 2:03 AM Derek Lin23 <<a href="mailto:dlin23@lenovo.com">dlin23@lenovo.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Hi Patrick: <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Adding the openbmc mailing list. Please always include this mailing list in your emails for archiving and later reference as well as opening up the question to others.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Also adding James Feist as he co-maintains this codebase.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> This is Derek from Lenovo BMC team.
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> We have some questions regarding of<a href="https://github.com/openbmc/phosphor-pid-control" target="_blank"> phosphos-pid-control</a>, and we hope
you can provide some advice of the component. <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> Currently, we would like to import phosphor-pid-control as our thermal fan control module. After a brief study, we would like to know if phosphor-pid-control
can support open-loop and event-triggered events?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">I don't really know what open-loop means in this context. Registering for events, like?<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"> <o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Thank you for your feedbacks,<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> <o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Derek<o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#404040">Derek Lin</span></b><span lang="EN-US"><br>
</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#404040">Sr. BMC Engineer</span><span lang="EN-US"><br>
</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#404040">8F,66, San Chong Rd., Nankang Software Park, Taipei. </span><span lang="EN-US"><br>
</span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#404040">Lenovo Taiwan</span><span lang="EN-US"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"><img border="0" width="23" height="9" style="width:.243in;height:.0972in" id="gmail-m_-5477778919526753120圖片_x0020_2" src="cid:image001.gif@01D53D49.E4EF69A0" alt="Phone"></span><span lang="EN-US" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#404040">+886281707411</span><span lang="EN-US"><br>
<a href="mailto:dlin23@lenovo.com" target="_blank"><span style="text-decoration:none"><img border="0" width="23" height="9" style="width:.243in;height:.0972in" id="gmail-m_-5477778919526753120圖片_x0020_3" src="cid:image002.gif@01D53D49.E4EF69A0" alt="Email"></span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#404040;text-decoration:none">dlin23@lenovo.com</span></a><o:p></o:p></span></p>
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