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| <li class="toctree-l3 current"><a class="current reference internal" href="#">Nordic nRF52</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="#memory-map">Memory Map</a><ul> |
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| <li class="toctree-l4"><a class="reference internal" href="#clock-configuration">Clock Configuration</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="#ble-support">BLE Support</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="#supported-boards">Supported Boards</a><ul> |
| <li class="toctree-l5"><a class="reference internal" href="boards/arduino-nano-33ble-rev2/index.html">Arduino Nano 33 BLE Sense Rev2</a></li> |
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| <li class="toctree-l5"><a class="reference internal" href="boards/nrf52-feather/intex.html">Adafruit NRF52 Feather</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="boards/nrf52832-dk/index.html">nRF52832-DK</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="boards/nrf52832-mdk/index.html">MakerDiary nRF52832-MDK</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="boards/nrf52832-sparkfun/index.html">Sparkfun nRF52832 Breakout</a></li> |
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| <li class="toctree-l5"><a class="reference internal" href="boards/nrf9160-dk-nrf52/index.html">Nordic nRF9160 DK (nRF52840)</a></li> |
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| <li class="toctree-l5"><a class="reference internal" href="boards/thingy91-nrf52/index.html">Nordic Thingy:91 (nRF52840)</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="boards/xiao-nrf52840/index.html">Seeed Studio XIAO nRF52840</a></li> |
| <li class="toctree-l5"><a class="reference internal" href="ieee802154.html">Nordic nRF52 IEEE 802.15.4</a></li> |
| </ul> |
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| <div role="main" class="document" itemscope="itemscope" itemtype="http://schema.org/Article"> |
| <div itemprop="articleBody"> |
| |
| <section id="nordic-nrf52"> |
| <h1>Nordic nRF52<a class="headerlink" href="#nordic-nrf52" title="Permalink to this heading"></a></h1> |
| <p>The nRF52 series of chips from Nordic Semiconductor are based around an ARM Cortex-M4 core running |
| at 64 MHz and feature Bluetooth Low Energy (BLE) support.</p> |
| <section id="memory-map"> |
| <h2>Memory Map<a class="headerlink" href="#memory-map" title="Permalink to this heading"></a></h2> |
| <section id="nrf52832"> |
| <h3>nRF52832<a class="headerlink" href="#nrf52832" title="Permalink to this heading"></a></h3> |
| <table class="docutils align-default"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Block Name</p></th> |
| <th class="head"><p>Start Address</p></th> |
| <th class="head"><p>Length</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>FLASH</p></td> |
| <td><p>0x00000000</p></td> |
| <td><p>512K</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>RAM</p></td> |
| <td><p>0x20000000</p></td> |
| <td><p>64K</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </section> |
| <section id="nrf52840"> |
| <h3>nRF52840<a class="headerlink" href="#nrf52840" title="Permalink to this heading"></a></h3> |
| <table class="docutils align-default"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Block Name</p></th> |
| <th class="head"><p>Start Address</p></th> |
| <th class="head"><p>Length</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>FLASH</p></td> |
| <td><p>0x00000000</p></td> |
| <td><p>1024K</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>RAM</p></td> |
| <td><p>0x20000000</p></td> |
| <td><p>256K</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </section> |
| </section> |
| <section id="clock-configuration"> |
| <h2>Clock Configuration<a class="headerlink" href="#clock-configuration" title="Permalink to this heading"></a></h2> |
| <p>Clock settings are handled via Kconfig options, which determines whether to start external crystal |
| for the HFCLK, whether to start the LFCLK and which oscillator to use.</p> |
| </section> |
| <section id="system-timer"> |
| <h2>System Timer<a class="headerlink" href="#system-timer" title="Permalink to this heading"></a></h2> |
| <p>The clock used for providing system time can be chosen via Kconfig. You can choose to use ARM SysTick |
| or use RTC in tickless mode.</p> |
| </section> |
| <section id="regulator-control"> |
| <h2>Regulator Control<a class="headerlink" href="#regulator-control" title="Permalink to this heading"></a></h2> |
| <p>DC/DC regulator can be made to be enabled at boot via Kconfig.</p> |
| </section> |
| <section id="peripheral-support"> |
| <h2>Peripheral Support<a class="headerlink" href="#peripheral-support" title="Permalink to this heading"></a></h2> |
| <p>The following list indicates peripherals supported in NuttX:</p> |
| <table class="docutils align-default"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Peripheral</p></th> |
| <th class="head"><p>Support</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>GPIO</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>GPIOTE</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>I2S</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>MWU</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>NFCT</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>PDM</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>PPI</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>PWM</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>QDEC</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>QSPI</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>RADIO</p></td> |
| <td><p>Yes</p></td> |
| <td><p>BLE, IEEE 802.15.4</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>RNG</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>RTC</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>SAADC</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>SPIM</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>SPIS</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>TEMP</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>TIMER</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>TWIM</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>TWIS</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>UART</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>UARTE</p></td> |
| <td><p>No</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-even"><td><p>USBD</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| <tr class="row-odd"><td><p>WDT</p></td> |
| <td><p>Yes</p></td> |
| <td></td> |
| </tr> |
| </tbody> |
| </table> |
| <p>Peripherals such as AAR, ACL, CCM, ECB are not directly used by NuttX since they |
| are part of BLE controller implementation (link).</p> |
| <section id="gpio-gpiote"> |
| <h3>GPIO/GPIOTE<a class="headerlink" href="#gpio-gpiote" title="Permalink to this heading"></a></h3> |
| <p>Pins can be configured/operated using <code class="docutils literal notranslate"><span class="pre">nrf52_gpio_*</span></code> functions. Interrupts are |
| handled via the GPIOTE peripheral in one of two ways: via a GPIOTE channel or via |
| PORT events. The former allows for simultaneous rising/falling edge-sensitive interrupts |
| per-pin. However, as there are a limited number of channels (and sometimes these |
| are used by some drivers for specific tasks), it may not always be possible to use |
| this mechanism. The latter approach for pin interrupts is via the PORT event, determined |
| by pin state on a their corresponding GPIO port. This is related to the SENSE capability |
| of pins, which can only be set to either rising or falling edge sensing.</p> |
| <p>Depending on <code class="docutils literal notranslate"><span class="pre">CONFIG_NRF52_PER_PIN_INTERRUPTS</span></code> option, you can set a callback for |
| the PORT event itself or you can set a callback for a given pin. In the latter case |
| the driver scans for pins with DETECT bit high and calls the configured callback |
| automatically.</p> |
| <p>Finally, GPIOTE can also be used to configure a channel in <em>task mode</em>, which allows to |
| control pin state via tasks/events.</p> |
| </section> |
| <section id="adc"> |
| <h3>ADC<a class="headerlink" href="#adc" title="Permalink to this heading"></a></h3> |
| <p>The SAADC peripheral is exposed via standard ADC driver. The lower-half of this driver |
| is initialized by calling <code class="xref c c-func docutils literal notranslate"><span class="pre">nrf52_adcinitialize()</span></code>.</p> |
| </section> |
| <section id="i2c"> |
| <h3>I2C<a class="headerlink" href="#i2c" title="Permalink to this heading"></a></h3> |
| <p>I2C is supported both in polling and interrupt mode (via EasyDMA).</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>The I2C peripheral does not support sending two transfers without sending |
| a START nor RSTART. For this reason, this is supported via an internal buffer where |
| messages will be first copied to and sent together.</p> |
| </div> |
| <p>The lower-half of I2C bus is initialized by <code class="xref c c-func docutils literal notranslate"><span class="pre">nrf52_i2cbus_initialize()</span></code>. |
| There’s also a software (bitbang) I2C implementation for nRF52. The lower-half is |
| initialized via <code class="xref c c-func docutils literal notranslate"><span class="pre">nrf52_i2c_bitbang_initialize()</span></code>.</p> |
| </section> |
| <section id="spi"> |
| <h3>SPI<a class="headerlink" href="#spi" title="Permalink to this heading"></a></h3> |
| <p>SPI is supported both in polling and interrupt-based (via EasyDMA) mode. The latter |
| supports arbitrarily long transfers using Nordic’s list-mode EasyDMA (intermediate |
| transfers are currently still manually started).</p> |
| <p>It is possible to use SPI without either MOSI/MISO pin defined by simply not providing |
| the relevant <code class="docutils literal notranslate"><span class="pre">BOARD_SPI*_MISO/MOSI_PIN</span></code> definition.</p> |
| <p>This implementation support power management hooks, which will disable SPI peripheral when |
| entering either SLEEP or STANDBY modes and reconfigure it when going back to NORMAL mode.</p> |
| </section> |
| <section id="uart"> |
| <h3>UART<a class="headerlink" href="#uart" title="Permalink to this heading"></a></h3> |
| <p>UART is implemented using polling. UARTE EasyDMA feature is not yet supported. |
| This may introduce a large number of interrupts which may be undesirable.</p> |
| </section> |
| <section id="ppi"> |
| <h3>PPI<a class="headerlink" href="#ppi" title="Permalink to this heading"></a></h3> |
| <p>The PPI peripheral is supported via a specific API which lets you control the EVENT |
| and TASKs to trigger, both for individual and grouped channels.</p> |
| <p>When using channels, you should consider that some peripherals may use PPI internally |
| and some may be unavailable for further use. As a helper, if debug assertions are |
| enabled, calls to PPI API will check for a channel to actually be disabled when being |
| enabled and vice-versa. This may help catch collisions in PPI use.</p> |
| </section> |
| <section id="pwm"> |
| <h3>PWM<a class="headerlink" href="#pwm" title="Permalink to this heading"></a></h3> |
| <p>PWM is supported via standard driver. This means that more advanced features such as |
| complex sequences or waveform modes are not yet supported.</p> |
| </section> |
| <section id="qspi"> |
| <h3>QSPI<a class="headerlink" href="#qspi" title="Permalink to this heading"></a></h3> |
| <p>QSPI is supported both in interrupt-based (via EasyDMA) mode and is exposed |
| via standard QSPI interface.</p> |
| </section> |
| <section id="rng"> |
| <h3>RNG<a class="headerlink" href="#rng" title="Permalink to this heading"></a></h3> |
| <p>The RNG peripheral will be used to register a random/urandom device automatically, when |
| enabled.</p> |
| </section> |
| <section id="timer"> |
| <h3>TIMER<a class="headerlink" href="#timer" title="Permalink to this heading"></a></h3> |
| <p>The TIMER peripheral is exposed as standard timer.</p> |
| </section> |
| <section id="rtc"> |
| <h3>RTC<a class="headerlink" href="#rtc" title="Permalink to this heading"></a></h3> |
| <p>The RTC peripheral is exposed as a standard timer, since it is really a low-power |
| timer, without any date handling capabilities.</p> |
| </section> |
| <section id="usbd"> |
| <h3>USBD<a class="headerlink" href="#usbd" title="Permalink to this heading"></a></h3> |
| <p>The USBD peripheral is exposed via standard USBDEV interface.</p> |
| </section> |
| <section id="wdt"> |
| <h3>WDT<a class="headerlink" href="#wdt" title="Permalink to this heading"></a></h3> |
| <p>The watchdog is supported via low-level API interface and also via standard watchdog |
| driver. The driver is written so as to handle an already running watchdog, which may |
| have been set by a bootloader.</p> |
| </section> |
| </section> |
| <section id="ble-support"> |
| <h2>BLE Support<a class="headerlink" href="#ble-support" title="Permalink to this heading"></a></h2> |
| <p>BLE is supported in nRF52 using Nordic’s <a class="reference external" href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrfxlib/softdevice_controller/README.html">SoftDevice Controller</a>, using HCI interface. To enable BLE support |
| you need to call <code class="xref c c-func docutils literal notranslate"><span class="pre">nrf52_sdc_initialize()</span></code> on boot, which will initialize the BLE controller.</p> |
| <p>SDC support involves registering various high-priority zero-latency interrupts and thus requires |
| enabling BASEPRI and high-priority interrupt support. On supported boards, a sample <code class="docutils literal notranslate"><span class="pre">sdc</span></code> configuration |
| is provided with settings already set.</p> |
| <p>Note that in this case, some peripherals (mostly those related to BLE) will be unavailable. Some PPI |
| channels will also be ocuppied (<code class="docutils literal notranslate"><span class="pre">NRF52_PPI_NUM_CONFIGURABLE_CHANNELS</span></code> will be set accordingly in this case).</p> |
| </section> |
| <section id="ieee-802-15-4-support"> |
| <h2>IEEE 802.15.4 Support<a class="headerlink" href="#ieee-802-15-4-support" title="Permalink to this heading"></a></h2> |
| <p>Details about IEEE 802.15.4 support for nRF52 can be found in <a class="reference internal" href="ieee802154.html"><span class="doc">Nordic nRF52 IEEE 802.15.4</span></a>.</p> |
| </section> |
| <section id="supported-boards"> |
| <h2>Supported Boards<a class="headerlink" href="#supported-boards" title="Permalink to this heading"></a></h2> |
| <div class="toctree-wrapper compound"> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="boards/arduino-nano-33ble-rev2/index.html">Arduino Nano 33 BLE Sense Rev2</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/arduino-nano-33ble/index.html">Arduino Nano 33 BLE Sense</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/nrf52-feather/intex.html">Adafruit NRF52 Feather</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/nrf52832-dk/index.html">nRF52832-DK</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/nrf52832-mdk/index.html">MakerDiary nRF52832-MDK</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/nrf52832-sparkfun/index.html">Sparkfun nRF52832 Breakout</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/nrf52840-dk/index.html">nRF52840-DK</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/nrf52840-dongle/index.html">nRF52840-dongle</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/nrf9160-dk-nrf52/index.html">Nordic nRF9160 DK (nRF52840)</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/thingy52/index.html">Nordic Thingy:52</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/thingy91-nrf52/index.html">Nordic Thingy:91 (nRF52840)</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="boards/xiao-nrf52840/index.html">Seeed Studio XIAO nRF52840</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="ieee802154.html">Nordic nRF52 IEEE 802.15.4</a></li> |
| </ul> |
| </div> |
| </section> |
| </section> |
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