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| <section id="esp32-devkitc"> |
| <h1>ESP32 DevKitC<a class="headerlink" href="#esp32-devkitc" title="Permalink to this heading"></a></h1> |
| <p>The <a class="reference external" href="https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/modules-and-boards.html#esp32-devkitc-v4">ESP32 DevKitC</a> is a development board for the ESP32 SoC from Espressif, based on a ESP-WROOM-32 module. You can find the original V2 version and the newer V4 variant. They are |
| pin compatible.</p> |
| <table class="docutils align-center"> |
| <tbody> |
| <tr class="row-odd"><td><figure class="align-center" id="id3"> |
| <img alt="../../../../../_images/esp32-core-board-v2.jpg" src="../../../../../_images/esp32-core-board-v2.jpg" /> |
| <figcaption> |
| <p><span class="caption-text">ESP32 DevKitC/Core V2</span><a class="headerlink" href="#id3" title="Permalink to this image"></a></p> |
| </figcaption> |
| </figure> |
| </td> |
| <td><figure class="align-center" id="id4"> |
| <img alt="../../../../../_images/esp32-devkitc-v4-front.jpg" src="../../../../../_images/esp32-devkitc-v4-front.jpg" /> |
| <figcaption> |
| <p><span class="caption-text">ESP32 DevKitC V4</span><a class="headerlink" href="#id4" title="Permalink to this image"></a></p> |
| </figcaption> |
| </figure> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <section id="features"> |
| <h2>Features<a class="headerlink" href="#features" title="Permalink to this heading"></a></h2> |
| <blockquote> |
| <div><ul class="simple"> |
| <li><p>ESP32 WROOM Module</p></li> |
| <li><p>USB-to-UART bridge via micro USB port</p></li> |
| <li><p>Power LED</p></li> |
| <li><p>EN and BOOT buttons (BOOT accessible to user)</p></li> |
| <li><p>SPI FLASH (size varies according to model</p></li> |
| </ul> |
| </div></blockquote> |
| </section> |
| <section id="serial-console"> |
| <h2>Serial Console<a class="headerlink" href="#serial-console" title="Permalink to this heading"></a></h2> |
| <p>UART0 is, by default, the serial console. It connects to the on-board |
| CP2102 converter and is available on the USB connector USB CON8 (J1).</p> |
| <p>It will show up as /dev/ttypUSB[n] where [n] will probably be 0 (is it 1 |
| on my PC because I have a another device at ttyUSB0).</p> |
| </section> |
| <section id="buttons-and-leds"> |
| <h2>Buttons and LEDs<a class="headerlink" href="#buttons-and-leds" title="Permalink to this heading"></a></h2> |
| <section id="buttons"> |
| <h3>Buttons<a class="headerlink" href="#buttons" title="Permalink to this heading"></a></h3> |
| <p>There are two buttons labeled Boot and EN. The EN button is not available |
| to software. It pulls the chip enable line that doubles as a reset line.</p> |
| <p>The BOOT button is connected to IO0. On reset it is used as a strapping |
| pin to determine whether the chip boots normally or into the serial |
| bootloader. After reset, however, the BOOT button can be used for software |
| input.</p> |
| </section> |
| <section id="leds"> |
| <h3>LEDs<a class="headerlink" href="#leds" title="Permalink to this heading"></a></h3> |
| <p>There are several on-board LEDs for that indicate the presence of power |
| and USB activity. None of these are available for use by software.</p> |
| </section> |
| </section> |
| <section id="ethernet"> |
| <h2>Ethernet<a class="headerlink" href="#ethernet" title="Permalink to this heading"></a></h2> |
| <p>ESP32 has a 802.11 hardware MAC, so just connects to external PHY chip. |
| Due to the limited number of GPIOs in ESP32, it’s recommended to use RMII to |
| connect to an external PHY chip. Current driver also only supports RMII option.</p> |
| <p>The RMII GPIO pins are fixed, but the SMI and functional GPIO pins are optional.</p> |
| <p>RMII GPIO pins are as following:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>ESP32 GPIO PHY Chip GPIO |
| IO25 <--> RXD[0] |
| IO26 <--> RXD[1] |
| IO27 <--> CRS_DV |
| IO0 <--> REF_CLK |
| IO19 <--> TXD[0] |
| IO21 <--> TX_EN |
| IO22 <--> TXD[1] |
| </pre></div> |
| </div> |
| <p>SMI GPIO pins (default option) are as following:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>ESP32 GPIO PHY Chip GPIO |
| IO18 <--> MDIO |
| IO23 <--> MDC |
| </pre></div> |
| </div> |
| <p>Functional GPIO pins(default option) are as following:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>ESP32 GPIO PHY Chip GPIO |
| IO5 <--> Reset_N |
| </pre></div> |
| </div> |
| <p>Espressif has an <a class="reference external" href="https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/esp32/get-started-ethernet-kit.html">official Ethernet development |
| board</a>.</p> |
| <p>This driver has been tested according to this board and ESP32 core |
| board + LAN8720 module. If users have some issue about using this driver, |
| please refer the upper official document, specially the issue that GPIO0 |
| causes failing to bring the ESP32 chip up.</p> |
| </section> |
| <section id="pin-mapping"> |
| <h2>Pin Mapping<a class="headerlink" href="#pin-mapping" title="Permalink to this heading"></a></h2> |
| <div class="admonition-todo admonition" id="id2"> |
| <p class="admonition-title">Todo</p> |
| <p>To be updated</p> |
| </div> |
| <table class="docutils align-default"> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Pin</p></th> |
| <th class="head"><p>Signal</p></th> |
| <th class="head"><p>Notes</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>?</p></td> |
| <td><p>?</p></td> |
| <td><p>?</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </section> |
| <section id="configurations"> |
| <h2>Configurations<a class="headerlink" href="#configurations" title="Permalink to this heading"></a></h2> |
| <section id="nsh"> |
| <h3>nsh<a class="headerlink" href="#nsh" title="Permalink to this heading"></a></h3> |
| <p>Basic NuttShell configuration (console enabled in UART0, exposed via |
| USB connection by means of CP2102 converter, at 115200 bps).</p> |
| </section> |
| <section id="wapi"> |
| <h3>wapi<a class="headerlink" href="#wapi" title="Permalink to this heading"></a></h3> |
| <p>Enables WiFi support. You can define your credentials this way:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ make menuconfig |
| -> Application Configuration |
| -> Network Utilities |
| -> Network initialization (NETUTILS_NETINIT [=y]) |
| -> WAPI Configuration |
| </pre></div> |
| </div> |
| <p>Or if you don’t want to keep it saved in the firmware you can do it |
| at runtime:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> wapi psk wlan0 mypasswd 1 |
| nsh> wapi essid wlan0 myssid 1 |
| nsh> renew wlan0 |
| </pre></div> |
| </div> |
| </section> |
| <section id="wifinsh"> |
| <h3>wifinsh<a class="headerlink" href="#wifinsh" title="Permalink to this heading"></a></h3> |
| <p>The <code class="docutils literal notranslate"><span class="pre">wifinsh</span></code> is similar to the <code class="docutils literal notranslate"><span class="pre">wapi</span></code> board example, but it will connect |
| automatically to your Access Point (Wi-Fi Router) and will run telnet daemon |
| in the board. Then you can connect to your board from your computer using the |
| telnet program.</p> |
| <p>After configuring the <code class="docutils literal notranslate"><span class="pre">esp32-devkit:wifinsh</span></code> you need to define your creden- |
| tials in the menuconfig. You can define your credentials this way:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ make menuconfig |
| -> Application Configuration |
| -> Network Utilities |
| -> Network initialization (NETUTILS_NETINIT [=y]) |
| -> WAPI Configuration |
| </pre></div> |
| </div> |
| <p>Find your board IP using <code class="docutils literal notranslate"><span class="pre">nsh></span> <span class="pre">ifconfig</span></code> and then from your computer:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ telnet 192.168.x.y |
| </pre></div> |
| </div> |
| <p>Where x and y are the last two numbers of the IP that your router gave to |
| your board.</p> |
| </section> |
| <section id="mqttc"> |
| <h3>mqttc<a class="headerlink" href="#mqttc" title="Permalink to this heading"></a></h3> |
| <p>This configuration tests the MQTT-C publisher example.</p> |
| <p>From the host, start the broker and subscribe to the <code class="code docutils literal notranslate"><span class="pre">test</span></code> topic. Using |
| <cite>mosquitto</cite> this should be:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>$ mosquitto& |
| $ mosquitto_sub -t test |
| </pre></div> |
| </div> |
| <p>From the NSH, connect to an access point:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> wapi psk wlan0 mypasswd 1 |
| nsh> wapi essid wlan0 myssid 1 |
| nsh> renew wlan0 |
| </pre></div> |
| </div> |
| <p>Publish to the broker:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> mqttc_pub -h 192.168.1.11 |
| </pre></div> |
| </div> |
| <p>The default behavior is to publish the message <code class="code docutils literal notranslate"><span class="pre">test</span></code>. The following should be |
| outputted:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> mqttc_pub -h 192.168.1.11 |
| Success: Connected to broker! |
| Success: Published to broker! |
| |
| Disconnecting from 192.168.1.11 |
| </pre></div> |
| </div> |
| <p>From the host the message <code class="code docutils literal notranslate"><span class="pre">test</span></code> should be outputted.</p> |
| </section> |
| <section id="smp"> |
| <h3>smp<a class="headerlink" href="#smp" title="Permalink to this heading"></a></h3> |
| <p>Another NSH configuration, similar to nsh, but also enables |
| SMP operation. It differs from the nsh configuration only in these |
| additional settings:</p> |
| <p>SMP is enabled:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>CONFIG_SMP=y |
| CONFIG_SMP_NCPUS=2 |
| CONFIG_SPINLOCK=y |
| </pre></div> |
| </div> |
| <p>The apps/testing/smp test is included:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>CONFIG_TESTING_SMP=y |
| CONFIG_TESTING_SMP_NBARRIER_THREADS=8 |
| CONFIG_TESTING_SMP_PRIORITY=100 |
| CONFIG_TESTING_SMP_STACKSIZE=2048 |
| </pre></div> |
| </div> |
| </section> |
| <section id="ostest"> |
| <h3>ostest<a class="headerlink" href="#ostest" title="Permalink to this heading"></a></h3> |
| <p>This is the NuttX test at apps/testing/ostest that is run against all new |
| architecture ports to assure a correct implementation of the OS. The default |
| version is for a single CPU but can be modified for an SMP test by adding:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>CONFIG_SMP=y |
| CONFIG_SMP_NCPUS=2 |
| CONFIG_SPINLOCK=y |
| </pre></div> |
| </div> |
| </section> |
| <section id="mcp2515"> |
| <h3>mcp2515<a class="headerlink" href="#mcp2515" title="Permalink to this heading"></a></h3> |
| <p>This config is used to communicate with MCP2515 CAN over SPI chip. |
| SPI3 is used and kept with the default IOMUX pins, i.e.:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>CS --> 5 |
| SCK --> 18 |
| MOSI --> 23 |
| MISO --> 19 |
| </pre></div> |
| </div> |
| <p>The MCP2515 interrupt (INT) pin is connected to the pin 22 of the |
| ESP32-Devkit.</p> |
| </section> |
| <section id="mmcsdspi"> |
| <h3>mmcsdspi<a class="headerlink" href="#mmcsdspi" title="Permalink to this heading"></a></h3> |
| <p>This config tests the SPI driver by connecting an SD Card reader over SPI. |
| SPI2 is used and kept with the default IOMUX pins, i.e.:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>CS --> 15 |
| SCK --> 14 |
| MOSI --> 13 |
| MISO --> 12 |
| </pre></div> |
| </div> |
| <p>Once booted the following command is used to mount a FAT file system:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> mount -t vfat /dev/mmcsd0 /mnt |
| </pre></div> |
| </div> |
| </section> |
| <section id="module"> |
| <h3>module<a class="headerlink" href="#module" title="Permalink to this heading"></a></h3> |
| <p>This config is to run apps/examples/module.</p> |
| </section> |
| <section id="sotest"> |
| <h3>sotest<a class="headerlink" href="#sotest" title="Permalink to this heading"></a></h3> |
| <p>This config is to run apps/examples/sotest.</p> |
| </section> |
| <section id="spiflash"> |
| <h3>spiflash<a class="headerlink" href="#spiflash" title="Permalink to this heading"></a></h3> |
| <p>This config tests the external SPI that comes with an ESP32 module connected |
| through SPI1.</p> |
| <p>By default a SmartFS file system is selected. |
| Once booted you can use the following commands to mount the file system:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> mksmartfs /dev/smart0 |
| nsh> mount -t smartfs /dev/smart0 /mnt |
| </pre></div> |
| </div> |
| <p>Note that mksmartfs is only needed the first time.</p> |
| </section> |
| <section id="psram"> |
| <h3>psram<a class="headerlink" href="#psram" title="Permalink to this heading"></a></h3> |
| <p>This config tests the PSRAM driver over SPIRAM interface. |
| You can use the ramtest command to test the PSRAM memory. We are testing |
| only 64KB on this example (64 * 1024), but you can change this number to |
| 2MB or 4MB depending on PSRAM chip used on your board:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> ramtest -w 0x3F800000 65536 |
| RAMTest: Marching ones: 3f800000 65536 |
| RAMTest: Marching zeroes: 3f800000 65536 |
| RAMTest: Pattern test: 3f800000 65536 55555555 aaaaaaaa |
| RAMTest: Pattern test: 3f800000 65536 66666666 99999999 |
| RAMTest: Pattern test: 3f800000 65536 33333333 cccccccc |
| RAMTest: Address-in-address test: 3f800000 65536 |
| </pre></div> |
| </div> |
| </section> |
| <section id="timer"> |
| <h3>timer<a class="headerlink" href="#timer" title="Permalink to this heading"></a></h3> |
| <p>This config test the general use purpose timers. It includes the 4 timers, |
| adds driver support, registers the timers as devices and includes the timer |
| example.</p> |
| <p>To test it, just run the following:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> timer -d /dev/timerx |
| </pre></div> |
| </div> |
| <p>Where x in the timer instance.</p> |
| </section> |
| <section id="watchdog"> |
| <h3>watchdog<a class="headerlink" href="#watchdog" title="Permalink to this heading"></a></h3> |
| <p>This config test the watchdog timers. It includes the 2 MWDTS, |
| adds driver support, registers the WDTs as devices and includes the watchdog |
| example.</p> |
| <p>To test it, just run the following:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>nsh> wdog -d /dev/watchdogx |
| </pre></div> |
| </div> |
| <p>Where x in the watchdog instance.</p> |
| </section> |
| </section> |
| </section> |
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