OpenTX Compilation Options

This page is outdated and documents OpenTX 2.1

See Build Option for the non debug build options and for 2.2 and use cmake -LH to display the variables

OpenTX 2.1 compile options

Here is the list of all compile options available in openTx so that you may choose the ones that you need / want.

To compile the firmware here is the syntax: make OPTION1=VALUE1 OPTION2=VALUE2...

Option	Default	Alternatives	Description
3POS	NO	POT1, POT2, POT3	Enable another 3 position switch to replace a pot
ARITHMETIC_OVERFLOW_CHECK	NO	YES	Adds additional code to prevent arithmetic overflows
AUDIO	NO	YES	Better Audio feedback (needs audio TX modification)
AUTOSOURCE	NO	YES	Sources automatic selection
AUTOSWITCH	NO	YES	In model setup menus automatically set switch by moving some of them
BATTGRAPH	NO	YES	TX battery graph on main screen
BLUETOOTH	NO	YES	When sky9x board used: Bluetooth support added
BOLD	YES	NO	In setup menu will be bold active FPs, DR/Expos, Mixes and Switches
CORRECT_NEGATIVE_VALUES	YES	NO	Corrects different rounding for negative values. Instead of -99.9 you see -100.0, but uses more flash
CURVES	YES	NO	Curves support
DBLKEYS	NO	YES	Double key press [invert, +/UP max, [min, UP/DOWN reset to default)
DEBUG	NO	YES	Activates debug mode
DEFAULT_MODE	NO	1, 2, 3, 4	Default TX mode
DSM2	NO	SERIAL, PPM	DSM2 protocol
EEPROM_PROGRESS_BAR	NO	YES	Progress bar on EEPROM writing
EXT	STD	FRSKY, JETI, NMEA, ARDUPILOT, MAVLINK,TELEMETREZ	Telemetry extension (needs TX modification)
FAI	NO	YES, CHOICE	Enables FAI rules restrictions
FLIGHT_MODES	YES	NO	Flight modes support
FONT	STD	STD, SQT5	Select font. The SQT5 font is heavier and looks best on the low contrast display of the Taranis
FRSKY_HUB	YES	NO	Frsky Hub supported (when EXT=FRSKY)
GAUGES	YES	NO	Telemetry screen also as GAUGES
GPS	YES	NO	GPS data support (saves 1.5k flash if disabled)
GRAPHICS	YES	NO	Graphical sliders and check boxes
GVARS	NO	YES	Global Variables
HAPTIC	NO	YES	Haptic feedback (needs haptic TX modification)
HELI	NO	YES	Heli support and menus
NAVIGATION	NO	POT1, POT2, POT3, POTS, ROTENC	Use only POT1/2/3 in menus navigation or all POTS, or Rotary encoder
PCB	9X	9X128, 9XR, 9XR128, 9XR2561, GRUVIN9X, MEGA2560, SKY9X, TARANIS	Stock 9X/9XR or with Atmega 128, gruvin9x, ersky9x, X9D boards
PCBREV	REV1 (gruvin9x) REVC (ersky9x) REVPLUS (X9D+)	REV0, REVA, REVB	Revision of the board (ersky9x REVC/B/A or gruvin9x REV1/0) (REVPLUS is used for the Taranis Plus)
PPM_CENTER_ADJUSTABLE	NO	YES	Adjustable PPM center for servos in limits menu PPM_LIMITS_SYMETRICAL
PPM_UNIT	PERCENT_PREC1	PERCENT_PREC0, US	Units for PPM center in % or µs with precision 0 or 1
PWM_BACKLIGHT	NO	YES	Fade IN/OUT Backlight using PWM
PXX	NO	YES	PXX protocol (dev in progress...)
RTCLOCK	YES	NO	Real time clock for gruvin9x, sky9x, x9d boards
SP22	NO	YES	SmartieParts 2.2 Backlight support
SPLASH	YES	NO	Splash displayed on Tx start
TEMPLATES	YES	NO	Templates screen enabled
TRANSLATIONS	EN	CZ, DE, ES, FR, IT, PL, PT, SE	User interface language
TTS	same as TRANSLATIONS	CZ, DE, ES, EN, FR, IT, PL, PT, SE, SK	Voice language
TX_CADDY	NO	YES	For auto-switching between DSM2/X and Fr-Sky transmitter modules on gruvin9x board
UNITS	METRIC	IMPERIAL	Metric or Imperial units
VARIO	YES	NO	Enable variable tone telemetry vario (when EXT=FRSKY)
VOICE	NO	YES	Play Voice files (needs voice TX modification)
WS_HOW_HIGH	YES	NO	Winged Shadow How High supported (when EXT=FRSKY)