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| <div class="section" id="mynewt-faq-hardware-specific-questions"> |
| <h1>Mynewt FAQ - Hardware-Specific Questions<a class="headerlink" href="#mynewt-faq-hardware-specific-questions" title="Permalink to this headline">¶</a></h1> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#nordic-nrf52-dk" id="id1">Nordic nRF52-DK</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#inverted-pin-value-on-nrf52-dk" id="id2">Inverted Pin Value on nRF52-DK</a></p></li> |
| <li><p><a class="reference internal" href="#time-precision-on-nrf52" id="id3">Time Precision on nRF52</a></p></li> |
| <li><p><a class="reference internal" href="#size-limit-on-transaction-length-for-nrf52" id="id4">Size Limit on Transaction Length for nRF52</a></p></li> |
| </ul> |
| </li> |
| <li><p><a class="reference internal" href="#redbear-ble-nano-2" id="id5">Redbear BLE Nano 2</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#view-logs-on-the-redbear-ble-nano2" id="id6">View Logs on the Redbear BLE Nano2</a></p></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="section" id="nordic-nrf52-dk"> |
| <h2><a class="toc-backref" href="#id1">Nordic nRF52-DK</a><a class="headerlink" href="#nordic-nrf52-dk" title="Permalink to this headline">¶</a></h2> |
| <div class="section" id="inverted-pin-value-on-nrf52-dk"> |
| <h3><a class="toc-backref" href="#id2">Inverted Pin Value on nRF52-DK</a><a class="headerlink" href="#inverted-pin-value-on-nrf52-dk" title="Permalink to this headline">¶</a></h3> |
| <p><strong>Q</strong>: I’ve been experiencing what seems to be some oddities with <code class="docutils literal notranslate"><span class="pre">hal_gpio_write</span></code>. It appears as though the LED |
| pin value on the nRF52-DK is inverted (0 sets the pin high, 1 sets it low). I am checking the GPIO state by turning |
| an LED on and off. Why is this the case?</p> |
| <p><strong>A</strong>: LEDs on the nRF52-DK are connected to VDD and GPIO so you need to set GPIO to a low state in order to make it turn on.</p> |
| </div> |
| <div class="section" id="time-precision-on-nrf52"> |
| <h3><a class="toc-backref" href="#id3">Time Precision on nRF52</a><a class="headerlink" href="#time-precision-on-nrf52" title="Permalink to this headline">¶</a></h3> |
| <p><strong>Q</strong>: Can <code class="docutils literal notranslate"><span class="pre">OS_TICKS_PER_SEC</span></code> be changed per app? I’m on the nRF52 and I need better time precision than 128Hz.</p> |
| <p><strong>A</strong>: No, it isn’t possible to change the ticks per second for a single app. That constant is defined to be most efficient |
| for the particular MCU.</p> |
| <p>If you need precision, the OS tick timer is probably not the right thing to use. Take a look at <a class="reference internal" href="../os/core_os/cputime/os_cputime.html"><span class="doc">OS CPU Time</span></a> for timer documentation. <code class="docutils literal notranslate"><span class="pre">os_cputime</span></code> has 1MHz frequency by default, and is enabled by default. |
| It is recommended to use this for higher precision applications.</p> |
| </div> |
| <div class="section" id="size-limit-on-transaction-length-for-nrf52"> |
| <h3><a class="toc-backref" href="#id4">Size Limit on Transaction Length for nRF52</a><a class="headerlink" href="#size-limit-on-transaction-length-for-nrf52" title="Permalink to this headline">¶</a></h3> |
| <p><strong>Q</strong>: There appears to be a 256-byte size limit on the maximum transaction length that the nRF52xxx <code class="docutils literal notranslate"><span class="pre">hal_i2c</span></code> driver can support. When I try send transactions larger than this the transactions fail (even after playing with a larger timeout etc). Does anyone know if this limit is due to the way the driver is written or the nRF52’s i2c peripheral itself?</p> |
| <p><strong>A</strong>: There shouldn’t be any limit here since TWI works basically by transferring data byte after byte. Check your slave device to see if it has some limit.</p> |
| </div> |
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| <div class="section" id="redbear-ble-nano-2"> |
| <h2><a class="toc-backref" href="#id5">Redbear BLE Nano 2</a><a class="headerlink" href="#redbear-ble-nano-2" title="Permalink to this headline">¶</a></h2> |
| <div class="section" id="view-logs-on-the-redbear-ble-nano2"> |
| <h3><a class="toc-backref" href="#id6">View Logs on the Redbear BLE Nano2</a><a class="headerlink" href="#view-logs-on-the-redbear-ble-nano2" title="Permalink to this headline">¶</a></h3> |
| <p><strong>Q</strong>: Is it possible to see debug statements / logs while using Mynewt on the Redbear BLE Nano2. If so, can someone please |
| tell me how to do so?</p> |
| <p><strong>A</strong>: The RedBear daplink board presents multiple USB devices, one is a serial port which you can connect to. The |
| <a class="reference internal" href="../tutorials/blinky/rbnano2.html"><span class="doc">Blinky example project</span></a> has debug log statements which you can look at for how to log.</p> |
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