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Already part of every solo build
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Input hardware add-ons
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Output / feedback hardware
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<h1>Build flags</h1>
<h2 id="build-flags">Build Flags</h2>
<p><a href="../../README.md">Go back</a></p>
<p>Reference for the <code>-D</code> build flags a Solo build understands beyond the
per-board defaults already set in <code>solo/&lt;board&gt;/platformio.ini</code>. Add any of
these to your own board's <code>build_flags</code> (in <code>solo/&lt;board&gt;/platformio.ini</code>) to
enable optional hardware you've wired up yourself, or to tune a default.
Everything below is a no-op when left unset — adding a flag for hardware that
isn't there costs nothing and can't brick a build; the exceptions (pin
conflicts, wrong polarity) are called out per flag.</p>
<p>None of this needs touching to get a board running — see the
<a href="../../README.md#building-from-source">environment table</a> for the flag-free
default build for each supported board.</p>
<hr />
<h3 id="already-part-of-every-solo-build">Already part of every solo build</h3>
<p>Set once per board in <code>solo/&lt;board&gt;/platformio.ini</code>, not usually touched
per-user. Listed here so the rest of this page can assume them.</p>
<table>
<thead>
<tr>
<th>Flag</th>
<th>Meaning</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>FIRMWARE_SOLO_BUILD=1</code></td>
<td>Marks the build as Solo (full on-device UI) rather than a companion-only firmware.</td>
</tr>
<tr>
<td><code>DUAL_SERIAL=1</code></td>
<td>The companion app can attach over BLE <em>or</em> USB serial, whichever it finds; BLE wins if both are live. Every solo build sets this — Solo standardises on one build per board rather than splitting BLE-only / USB-only variants.</td>
</tr>
<tr>
<td><code>MAX_CONTACTS=&lt;n&gt;</code></td>
<td>Size of the contact table. Default is 32 if unset; solo builds set 350.</td>
</tr>
<tr>
<td><code>MAX_GROUP_CHANNELS=&lt;n&gt;</code></td>
<td>Size of the channel list. Required for channel support to compile in at all — not optional the way the rest of this page is.</td>
</tr>
<tr>
<td><code>OFFLINE_QUEUE_SIZE=&lt;n&gt;</code></td>
<td>How many messages queue for later delivery while the phone app is disconnected. Default 16; solo builds set 256.</td>
</tr>
<tr>
<td><code>UI_SENSORS_PAGE=1</code></td>
<td>Enables the on-device sensors dashboard page.</td>
</tr>
<tr>
<td><code>BLE_PIN_CODE=&lt;n&gt;</code></td>
<td>See below — not a plain fixed value in practice.</td>
</tr>
<tr>
<td><code>DISPLAY_CLASS=&lt;Class&gt;</code></td>
<td>Selects the display driver (e.g. <code>SSD1306Display</code>, <code>GxEPDDisplay</code>, <code>ST7789Display</code> — see <code>src/helpers/ui/</code> for the full set). Fixed by whatever panel the board actually has; only relevant if you're wiring on a <em>different</em> display than stock, in which case the matching driver's <code>.cpp</code> also needs adding to <code>build_src_filter</code>.</td>
</tr>
</tbody>
</table>
<p><strong><code>BLE_PIN_CODE</code></strong> has a special case baked in: if it's left at the literal
value <code>123456</code> <em>and</em> the board has a display, pairing uses a random 6-digit
PIN generated fresh each session and shown on-device, rather than a fixed one.
Any other numeric value is used as a static PIN instead. Leaving the flag out
entirely disables the PIN prompt (BLE pairing is unauthenticated).</p>
<hr />
<h3 id="input-hardware-add-ons">Input hardware add-ons</h3>
<p>Each of these assumes you're wiring something up yourself — check pins are
actually free on your board first (see the board's <code>variant.h</code> and its
existing <code>solo/&lt;board&gt;/platformio.ini</code> for what's already claimed).</p>
<table>
<thead>
<tr>
<th>Flag</th>
<th>Adds</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>ENV_PIN_SDA</code> / <code>ENV_PIN_SCL</code></td>
<td>CardKB (M5Stack I2C keyboard, addr <code>0x5F</code>) on a second I2C bus (resolves to <code>Wire1</code>). Probed at boot — harmless with nothing plugged in. See <a href="../external_keyboard/">External Keyboard &amp; Joystick</a>.</td>
</tr>
<tr>
<td><code>CARDKB_I2C=&lt;Wire\|Wire1&gt;</code></td>
<td>Same CardKB support, naming the bus directly — for a board with no free pins for a second bus, set <code>CARDKB_I2C=Wire</code> to share the primary bus (already used by the display/RTC) instead of defining <code>ENV_PIN_SDA</code>/<code>ENV_PIN_SCL</code>. Takes precedence if both are somehow set.</td>
</tr>
<tr>
<td><code>UI_HAS_JOYSTICK=1</code> + <code>UI_HAS_JOYSTICK_UPDOWN=1</code> (optional) + <code>JOYSTICK_UP</code> / <code>JOYSTICK_DOWN</code> / <code>JOYSTICK_LEFT</code> / <code>JOYSTICK_RIGHT</code> + <code>PIN_USER_BTN</code> + <code>PIN_BACK_BTN</code></td>
<td>A wired joystick (four direction contacts + a press contact for Enter). Replaces single-button navigation entirely once enabled. See <a href="../external_keyboard/">External Keyboard &amp; Joystick</a>.</td>
</tr>
<tr>
<td><code>PIN_GPIO1</code> .. <code>PIN_GPIO4</code></td>
<td>Up to four general-purpose pins, each independently switchable between Off / Input / Output (GPIO1/GPIO2 also get an Analog step, if wired to an ADC-capable pin) from Tools › GPIO, and via the <code>!gpio1</code>..<code>!gpio4</code> bot commands. Not restricted to any particular board — works anywhere the pins are actually free. See <a href="../tools_screen/tools_screen/#gpio">Tools Screen › GPIO</a>.</td>
</tr>
<tr>
<td><code>PIN_HALL_SENSOR</code> + <code>HALL_ACTIVE_HIGH=1</code> (optional)</td>
<td>A Hall-effect or reed sensor for a magnetic flip cover: closing locks and blanks the screen instantly, opening unlocks and wakes it, no combo either way. <code>HALL_ACTIVE_HIGH</code> is only for a module wired to pull the pin high (rather than low) when the magnet is near. See <a href="../screen_lock/screen_lock/#magnetic-cover-hall-sensor">Screen Lock › Magnetic cover</a>.</td>
</tr>
<tr>
<td><code>PIN_GPS_SWITCH</code></td>
<td>A physical on/off switch for GPS power, read alongside the software GPS toggle — the Tools screen shows <code>gps off(hw)</code> / <code>gps off(sw)</code> when the two disagree, instead of silently trusting one over the other.</td>
</tr>
</tbody>
</table>
<hr />
<h3 id="output-feedback-hardware">Output / feedback hardware</h3>
<table>
<thead>
<tr>
<th>Flag</th>
<th>Adds</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>PIN_BUZZER</code> (+ <code>PIN_BUZZER_EN</code>, optional)</td>
<td>A passive piezo buzzer, driven by direct PWM (nRF52) or the <code>NonBlockingRtttl</code> library (everything else) for RTTTL ringtones and UI beeps. <code>PIN_BUZZER_EN</code> is an optional enable line some boards wire separately from the signal pin.</td>
</tr>
<tr>
<td><code>PIN_VIBRATION</code></td>
<td>A vibration motor for haptic notification, via <code>GenericVibration</code>.</td>
</tr>
</tbody>
</table>
<hr />
<h3 id="gps">GPS</h3>
<table>
<thead>
<tr>
<th>Flag</th>
<th>Meaning</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>ENV_INCLUDE_GPS=1</code></td>
<td>Compiles in GPS support (NMEA parsing, location provider) at all.</td>
</tr>
<tr>
<td><code>GPS_BAUD_RATE=&lt;n&gt;</code></td>
<td>Baud rate for the GPS module's serial link (<code>Serial1</code>). Match your module's default.</td>
</tr>
</tbody>
</table>
<p><code>PIN_GPS_SWITCH</code> (above) is independent of both — it's a hardware kill switch
layered on top of GPS support, not a requirement for it.</p>
<hr />
<h3 id="display-battery-tuning">Display &amp; battery tuning</h3>
<table>
<thead>
<tr>
<th>Flag</th>
<th>Meaning</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>OLED_MISC_FIXED_FONT=1</code></td>
<td>Pulls in a full Latin/Greek/Cyrillic 6×9 fixed font (~14 KB flash) so typed text in those alphabets renders as itself instead of block placeholders. Worth it on any board with a keyboard; skip it on space-constrained builds without one.</td>
</tr>
<tr>
<td><code>DISPLAY_ROTATION=&lt;0-3&gt;</code></td>
<td>Rotates the panel in 90° steps, for a board mounted sideways or upside down.</td>
</tr>
<tr>
<td><code>ENABLE_SCREENSHOT</code></td>
<td>Lets Solo Tools read the framebuffer over USB to capture a screenshot.</td>
</tr>
<tr>
<td><code>KEEP_DISPLAY_ON_USB</code></td>
<td>Refreshes the auto-off deadline continuously while externally (USB) powered, so the auto-off timer only starts counting once power is actually removed. Off by default because OLED panels burn in quickly with a permanently-lit screen — only worth enabling for an LCD/e-ink target, or a display you don't mind replacing.</td>
</tr>
<tr>
<td><code>AUTO_OFF_MILLIS=&lt;ms&gt;</code></td>
<td>How long the display stays on before auto-off. Default 15000 (15s); <code>0</code> disables auto-off entirely.</td>
</tr>
<tr>
<td><code>UI_RECENT_LIST_SIZE=&lt;n&gt;</code></td>
<td>How many entries the recent-activity lists show before scrolling. Default 4.</td>
</tr>
</tbody>
</table>
<hr />
<h3 id="misc">Misc</h3>
<table>
<thead>
<tr>
<th>Flag</th>
<th>Meaning</th>
</tr>
</thead>
<tbody>
<tr>
<td><code>ADVERT_NAME='"name"'</code></td>
<td>Sets the default node name baked into a fresh device, instead of the hex of the first 4 bytes of its public key. Note the doubled quoting — it's a C string literal passed through a build flag.</td>
</tr>
<tr>
<td><code>MESHCORE_VERSION='"x.y"'</code></td>
<td>Overrides the upstream MeshCore base-version string shown in diagnostics, for boards whose port hasn't been rebased onto the latest yet. Cosmetic only — doesn't change protocol behaviour.</td>
</tr>
</tbody>
</table>
</article>
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