https://forge.codesys.com/forge/talk/Runtime/thread/3215fa7bf3/2020-02-27T16:18:53.635000ZRecent posts to Time Quanta, Baud Rate Prescaler on MCP25152020-02-27T16:18:53.635000Z2020-02-27T16:18:53.635000ZKalyani-Khttps://forge.codesys.com/u/kalyani-k/https://forge.codesys.com8ee05e940e61d104728ec7872876852d157444e3

<div class="markdown_content"><p>Hello everyone!</p> <p>The following is the description of the operation I am working on using CodeSYS:</p> <p><strong>What</strong> : Interfacing NiRen CAN interface with Raspberry PI B+</p> <p><strong>Why</strong> : To have RasPI behave like a transmitting node on the CAN bus.</p> <p><strong>How</strong> : MCP2515 connected to the Raspberry PI via SPI interface </p> <p><strong>Questions</strong> : <br/> 1.1. Per the MCP2515 datasheet, every bit has a bit construction, which is mainly associated with the TIME QUANTA (TQ). <br/> The formula for TQ being <br/> <strong> TQ = 2.BRP.Tosc</strong></p> <div class="codehilite"><pre><span></span> <span class="n">What</span> <span class="k">is</span> <span class="n">the</span> <span class="n">BRP</span><span class="o">?</span> <span class="n">What</span> <span class="k">is</span> <span class="n">Tosc</span><span class="o">?</span> </pre></div> <p>1.2. How do you select the oscillator frequency for using it in the program?</p> <ol> <li> <p>In the configuration register for MCP2515, how do you determine and set the values of BRP bits?</p> </li> <li> <p>How do you decide upon the values for SJW, PROP_SEG, PH_SEG1, PH_SEG2 and Sampling point?</p> </li> </ol> <p>Any bit of information on the above mentioned queries will be highly appreciated.</p> <p><strong>(PS: I am NOT using the CAN bus example available on CodeSYS)</strong></p></div>