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| <div class="section" id="mynewt-faq-drivers-and-modules"> |
| <h1>Mynewt FAQ - Drivers and Modules<a class="headerlink" href="#mynewt-faq-drivers-and-modules" title="Permalink to this headline">¶</a></h1> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#drivers-in-mynewt" id="id1">Drivers in Mynewt</a></p></li> |
| <li><p><a class="reference internal" href="#module-argument-in-mynewt-logging-library" id="id2">Module Argument in Mynewt Logging Library</a></p></li> |
| <li><p><a class="reference internal" href="#log-name-vs-module-number" id="id3">Log Name vs. Module Number</a></p></li> |
| </ul> |
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| <div class="section" id="drivers-in-mynewt"> |
| <h2><a class="toc-backref" href="#id1">Drivers in Mynewt</a><a class="headerlink" href="#drivers-in-mynewt" title="Permalink to this headline">¶</a></h2> |
| <p><strong>Q</strong>: Is this a correct assumption about Mynewt, that if there exists no driver implementation for a specific SoC, |
| in <code class="docutils literal notranslate"><span class="pre">hw/drivers/</span></code>, then it is not supported. For instance, there exists a flash driver for <code class="docutils literal notranslate"><span class="pre">at45db</span></code>, this implies |
| that the Nordic nRF52 SoC is not supported at the moment?</p> |
| <p><strong>A</strong>: <code class="docutils literal notranslate"><span class="pre">at45db</span></code> is SPI, and any SPI would work. You send SPI configuration info when initializing. SPI drivers are below |
| the <code class="docutils literal notranslate"><span class="pre">hw/mcu/</span></code> tree. <code class="docutils literal notranslate"><span class="pre">hw/drivers/pwm</span></code> and <code class="docutils literal notranslate"><span class="pre">hw/drivers/adc</span></code> are SoC specific. In general, drivers are for peripherals |
| that aren’t universally supported. Features that all (or nearly all) MCUs support are implemented in the HAL. For example, |
| internal flash support is a HAL feature. Visit the <a class="reference internal" href="../os/modules/hal/hal.html"><span class="doc">HAL Documentation</span></a> for more information.</p> |
| </div> |
| <div class="section" id="module-argument-in-mynewt-logging-library"> |
| <h2><a class="toc-backref" href="#id2">Module Argument in Mynewt Logging Library</a><a class="headerlink" href="#module-argument-in-mynewt-logging-library" title="Permalink to this headline">¶</a></h2> |
| <p><strong>Q</strong>: Can you tell me what the purpose of the module argument is in the Mynewt logging library? It looks like it just |
| takes an <code class="docutils literal notranslate"><span class="pre">int</span></code>. Is this just to assign an integer ID for each module that logs?</p> |
| <p><strong>A</strong>: It is just an integer which accompanies each log entry. It provides context for each log entry, and it allows a |
| client to filter messages based on module (e.g. “give me all the file system log entries”).</p> |
| </div> |
| <div class="section" id="log-name-vs-module-number"> |
| <h2><a class="toc-backref" href="#id3">Log Name vs. Module Number</a><a class="headerlink" href="#log-name-vs-module-number" title="Permalink to this headline">¶</a></h2> |
| <p><strong>Q</strong>: So, what is the conceptual difference between a log name, and a module number? It seems like a log type would be |
| assigned the same name as the module that is using it, and that the module number is just a numerical ID for the module. |
| Basically, I don’t understand what the purpose of storing the name into the log type is, and passing the module number |
| in as part of <code class="docutils literal notranslate"><span class="pre">LOG_<LEVEL></span></code> macro.</p> |
| <p><strong>A</strong>: A log just represents a medium or region of storage (e.g., “console”, or “flash circular buffer in 12kB of flash, |
| starting at 0x0007d000”). Many parts of the system can write to the same log, so you may end up with Bluetooth, file |
| system, and kernel scheduler entries all in the same log. The module ID distinguishes these entries from one another. |
| You can control level per module, so you can say, “give me all bluetooth warnings, but only give me system level errors”.</p> |
| <p><strong>Q</strong>: Okay, so for something like console logging, we would likely register one log for the entire application, and give |
| each module an ID?</p> |
| <p><strong>A</strong>: I think the thought is that would be the debug log, and during development you could pipe that to console. In production, |
| that might go in the spare image slot. I’m not sure if we support it yet, but we should make sure the log can write to multiple |
| handlers at the same time.</p> |
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