diff --git a/platformio.ini b/platformio.ini
index b34cd60..474d435 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -63,6 +63,7 @@ build_flags =
   -DTFT_RST=2
   -DSPI_FREQUENCY=27000000
   -DDEFAULT_SWAPSCREENBYTES=false
+  -DFEATURE_SERIAL
   -DPINS_RX1=4
   -DPINS_TX1=5
   -DPINS_RX2=25
@@ -115,6 +116,8 @@ build_flags =
   -DTFT_RST=2
   -DSPI_FREQUENCY=27000000
   -DDEFAULT_SWAPSCREENBYTES=false
+  -DFEATURE_CAN
+;  -DFEATURE_SERIAL
 ;  -DPINS_RX1=4
 ;  -DPINS_TX1=5
 ;  -DPINS_RX2=22
@@ -163,7 +166,6 @@ build_flags =
 ;  -DDEFAULT_GAMETRAKDISTMIN=0
 ;  -DDEFAULT_GAMETRAKDISTMAX=4095
 ;  -DFEATURE_CLOUD
-  -DFEATURE_CAN
 
 [env:feedc0de_usb]
 platform = ${feedc0de.platform}
@@ -332,6 +334,7 @@ build_flags =
   ${default_wheels_inverted.build_flags}
   -DDEFAULT_WHEELDIAMETER=165
 ; TODO: actually assign pins
+  -DFEATURE_SERIAL
   -DPINS_RX1=22
   -DPINS_TX1=25
   -DPINS_RX2=23
@@ -421,6 +424,7 @@ build_flags =
   -DTFT_RST=2
   -DSPI_FREQUENCY=27000000
   -DDEFAULT_SWAPSCREENBYTES=false
+  -DFEATURE_SERIAL
   -DPINS_RX1=4
   -DPINS_TX1=5
   -DPINS_RX2=25
diff --git a/src/controller.h b/src/controller.h
index 8a27cb3..a177977 100644
--- a/src/controller.h
+++ b/src/controller.h
@@ -7,22 +7,22 @@
 
 #include "types.h"
 
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
 #include "feedbackparser.h"
 #endif
 
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
 class HardwareSerial;
 #endif
 
 namespace {
 struct Controller {
     Controller(
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
         HardwareSerial &serial,
 #endif
         bool &enableLeft, bool &enableRight, bool &invertLeft, bool &invertRight) :
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
         serial{serial},
 #endif
         enableLeft{enableLeft}, enableRight{enableRight}, invertLeft{invertLeft}, invertRight{invertRight}
@@ -31,7 +31,7 @@ struct Controller {
 //    Controller(const Controller &) = delete;
 //    Controller &operator=(const Controller &) = delete;
 
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
     std::reference_wrapper<HardwareSerial> serial;
 #endif
     bool &enableLeft, &enableRight, &invertLeft, &invertRight;
@@ -44,7 +44,7 @@ struct Controller {
     bool feedbackValid{};
     bobbycar::protocol::serial::Feedback feedback{};
 
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
     FeedbackParser parser{serial, feedbackValid, feedback};
 #endif
 };
diff --git a/src/displays/menus/controllerhardwaresettingsmenu.h b/src/displays/menus/controllerhardwaresettingsmenu.h
index caaf32b..df6c851 100644
--- a/src/displays/menus/controllerhardwaresettingsmenu.h
+++ b/src/displays/menus/controllerhardwaresettingsmenu.h
@@ -60,7 +60,7 @@ public:
         constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_WHEELDIAMETERMM>,   SwitchScreenAction<WheelDiameterMmChangeScreen>>>();
         constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_WHEELDIAMETERINCH>, SwitchScreenAction<WheelDiameterInchChangeScreen>>>();
         constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_NUMMAGNETPOLES>,    SwitchScreenAction<NumMagnetPolesChangeScreen>>>();
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
         constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_SWAPFRONTBACK>,     ToggleBoolAction, CheckboxIcon, SwapFrontBackAccessor>>();
 #endif
         constructMenuItem<makeComponent<MenuItem, StaticText<TEXT_BACK>,              SwitchScreenAction<SettingsMenu>, StaticMenuItemIcon<&icons::back>>>();
diff --git a/src/globals.h b/src/globals.h
index 81615c6..8c0c2f4 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -42,13 +42,13 @@ public:
     explicit Controllers() :
         std::array<Controller, 2>{{
             Controller {
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
                 Serial1,
 #endif
                 settings.controllerHardware.enableFrontLeft, settings.controllerHardware.enableFrontRight, settings.controllerHardware.invertFrontLeft, settings.controllerHardware.invertFrontRight
             },
             Controller {
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
                 Serial2,
 #endif
                 settings.controllerHardware.enableBackLeft, settings.controllerHardware.enableBackRight, settings.controllerHardware.invertBackLeft, settings.controllerHardware.invertBackRight
diff --git a/src/main.cpp b/src/main.cpp
index 75d91c1..bc30dbe 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -243,7 +243,7 @@ void setup()
     }
     printMemoryStats("loadSettings()");
 
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
     bootLabel.redraw("swap front back");
     updateSwapFrontBack();
     printMemoryStats("swapFronBack()");
@@ -309,7 +309,9 @@ void setup()
 
 #ifdef FEATURE_CAN
     initCan();
-#else
+#endif
+
+#ifdef FEATURE_SERIAL
     bootLabel.redraw("front Serial begin");
     controllers.front.serial.get().begin(38400, SERIAL_8N1, PINS_RX1, PINS_TX1);
 
@@ -440,7 +442,9 @@ void loop()
     for (int i = 0; i < 4; i++)
         if (!parseCanInput())
             break;
-#else
+#endif
+
+#ifdef FEATURE_SERIAL
     for (Controller &controller : controllers)
         controller.parser.update();
 #endif
diff --git a/src/presets.h b/src/presets.h
index 1f8a4e0..86897f9 100644
--- a/src/presets.h
+++ b/src/presets.h
@@ -32,7 +32,7 @@ constexpr Settings::ControllerHardware defaultControllerHardware {
 
     .wheelDiameter = DEFAULT_WHEELDIAMETER,
     .numMagnetPoles = 15,
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
     .swapFrontBack = false
 #endif
 };
@@ -50,7 +50,7 @@ constexpr Settings::ControllerHardware mosfetsOffControllerHardware {
 
     .wheelDiameter = 165,
     .numMagnetPoles = 15,
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
     .swapFrontBack = false
 #endif
 };
@@ -79,7 +79,7 @@ constexpr Settings::ControllerHardware spinnerControllerHardware {
 
     .wheelDiameter = 165,
     .numMagnetPoles = 15,
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
     .swapFrontBack = false
 #endif
 };
diff --git a/src/settings.h b/src/settings.h
index 0d6e967..570b1aa 100644
--- a/src/settings.h
+++ b/src/settings.h
@@ -51,7 +51,7 @@ struct Settings
 
         int16_t wheelDiameter; // in mm
         int16_t numMagnetPoles; // virtual RPM per one real RPM
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
         bool swapFrontBack;
 #endif
     } controllerHardware;
@@ -144,7 +144,7 @@ void Settings::executeForEverySetting(T &&callable)
 
     callable("wheelDiameter", controllerHardware.wheelDiameter);
     callable("numMagnetPoles", controllerHardware.numMagnetPoles);
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
     callable("swapFrontBack", controllerHardware.swapFrontBack);
 #endif
 
diff --git a/src/settingsaccessors.h b/src/settingsaccessors.h
index 8c82d5d..bc1377a 100644
--- a/src/settingsaccessors.h
+++ b/src/settingsaccessors.h
@@ -56,7 +56,7 @@ struct WheelDiameterInchAccessor : public virtual AccessorInterface<float>
     void setValue(float value) override { settings.controllerHardware.wheelDiameter = convertFromInch(value); saveSettings(); }
 };
 struct NumMagnetPolesAccessor : public RefAccessorSaveSettings<int16_t> { int16_t &getRef() const override { return settings.controllerHardware.numMagnetPoles; } };
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
 struct SwapFrontBackAccessor : public RefAccessorSaveSettings<bool> {
     bool &getRef() const override { return settings.controllerHardware.swapFrontBack; }
     void setValue(bool value) override { RefAccessorSaveSettings<bool>::setValue(value); updateSwapFrontBack(); };
diff --git a/src/utils.h b/src/utils.h
index 7b79d32..88eb8e8 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -256,14 +256,15 @@ void fixCommonParams()
 
 void sendCommands()
 {
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
     for (Controller &controller : controllers)
     {
         controller.command.start = Command::VALID_HEADER;
         controller.command.checksum = calculateChecksum(controller.command);
         controller.serial.get().write((uint8_t *) &controller.command, sizeof(controller.command));
     }
-#else
+#endif
+#ifdef FEATURE_CAN
     sendCanCommands();
 #endif
 }
@@ -271,7 +272,7 @@ void sendCommands()
 template<typename T, typename... Args>
 void switchScreen(Args&&... args);
 
-#ifndef FEATURE_CAN
+#ifdef FEATURE_SERIAL
 void updateSwapFrontBack()
 {
     controllers.front.serial = settings.controllerHardware.swapFrontBack ? Serial2 : Serial1;