ArduPilot Firmware User Guide

This chapter describes key points to note when running ArduPilot firmware on the X25 EVO. In addition to this chapter, you may also need to read the following content:

Loading Firmware

The X25 EVO® controller supports ArduPilot. The following mainly explains how to load the ArduPilot firmware.

[!TIP] The X25 EVO supports firmware versions 4.6.3 and above.

Online Firmware Flashing:

  • Run the LGC Ground Station
  • Click the LGC icon > Vehicle Settings > Firmware.
  • Connect the device to your computer via USB.
  • Select the type of firmware to flash.

afirmware

Load local firmware：

Download the firmware to your local device:

Copter

Helicopter

Plane & VTOL

Rover

Boat/Submarine

Then follow these steps to flash:

  • In the firmware flashing settings, check Advanced Settings.
  • Select Custom Firmware as the version.
  • In the pop-up window, choose the downloaded firmware file.

GPS/RTK Configuration

[!TIP] The LGC Ground Station supports graphical configuration of GPS/RTK modules. Click the corresponding GPS/RTK icon and follow the system prompts for automatic configuration. You can configure the GPS position offset via the module position slider, and configure GPS2 via the "Positioning Module 2" slider.

afirmware

Power Module

The X25 EVO comes standard with the PMU2 Lite power module, which supports 20–70V input and can measure a maximum current of 220A. It can be directly connected to the Power C1/C2 port of the X25 EVO.

x25

Airspeed Sensor Configuration

For airframes that require an airspeed sensor, such as Plane/vertical and VTOL, you can configure it in LGC > Vehicle Settings > Sensors > Airspeed Sensor.

firmware

[!TIP] To zero/calibrate the airspeed: Go to Flight View > Real-Time Properties > Airspeed Calibration.

Accelerometer/Gyroscope/Compass Calibration

[!TIP] Calibrate the accelerometer, gyroscope, and compass on the Sensor Calibration page. Follow the LGC guide to complete the process.

UART Mapping

SERIAL0 -> USB SERIAL1 -> UART7 (TELEM1) SERIAL2 -> UART5 (TELEM2) SERIAL3 -> USART1 (GPS1&SAFETY) SERIAL4 -> USART2 (GPS2) SERIAL5 -> UART4 (None, labelled UART4) SERIAL6 -> USART3 (None, labelled FMU DEBUG) SERIAL7 -> OTG2 (SLCAN)

SERIAL Mark
SERIAL0 USB
SERIAL1 UART7 (TELEM1)
SERIAL2 UART5 (TELEM2)
SERIAL3 USART1 (GPS1&SAFETY)
SERIAL4 USART2 (GPS2)
SERIAL5 UART4
SERIAL6 USART3 (DEBUG/DSU)
SERIAL7 OTG2 (SLCAN)

[!NOTE] The TELEM1 and TELEM2 ports support flow control (RTS/CTS); other UARTs do not have RTS/CTS pins. All UARTs are equipped with fully functional DMA.

RC Input

Hardware Connection Diagram
The RC IN port supports all one-way RC protocols (SBUS/PPM/DSM).

DSM/PPM/SBUS Receivers

Use Dupont wires to connect the receiver to the RC IN port—no additional parameter settings are required.

Receivers with Two-Way Protocols (e.g., CRSF/ELRS)

For receivers with two-way telemetry protocols (such as CRSF/ELRS), connect them to a UART port. The following is a setup tutorial (taking SERIAL2 (UART5/TELEM2) for two-way RC as an example):

ELRS Receivers

Connect the receiver to the TELEM2 port and set the following parameters:

  • SERIAL2_PROTOCOL=23;
  • SERIAL2_OPTIONS=0;
  • RSSI_TYPE=3;
  • RC_OPTIONS=8192 (Use 420kbaud for ELRS protocol);
  • Save the parameters and restart the controller.

CRSF Receivers

  • SERIAL2_PROTOCOL=23;
  • SERIAL2_OPTIONS=0;
  • RSSI_TYPE=3;

FPort Receivers

[!TIP] Any UART can be used to connect an RC receiver in ArduPilot, and it is compatible with all protocols except PPM. For details, refer to Radio Control Systems.

PWM Output

The X25 EVO supports 16 PWM output channels, which are divided into 5 groups. Each group uses a different timer—only one output rate or protocol can be used for all channels in the same group.

PWM Output Grouping:

  • PWM 1–4: Group 1 (TIM5)
  • PWM 5–8: Group 2 (TIM4)
  • PWM 9–11: Group 3 (TIM1)
  • PWM 12–14: Group 4 (TIM8)
  • PWM 15–16: Group 5 (TIM12)

[!NOTE] Channels in the same group must use the same output rate. If any channel in a group uses DShot, all channels in that group must use DShot. Channels 15 and 16 only support PWM—they do not support voltage levels or DShot.

[!TiP] All channels support switching between 3.3V/5V PWM. For long cable runs or high-power systems, 5V PWM is recommended. Use the BRD_PWM_VOLT_SEL parameter to set the PWM voltage level.

GPIO

All servo outputs can be used as GPIOs (for relays, camera shutters, RPM, etc.). To use a servo output as a GPIO, set SERVOx_FUNCTION=-1 (where x is the pin number).

GPIO Pin Mapping:

Pin name SERVO SN GPIO number
M1 SERVO1 50
M2 SERVO2 51
M3 SERVO3 52
M4 SERVO4 53
M5 SERVO5 54
M6 SERVO6 55
M7 SERVO7 56
M8 SERVO8 57
M9 SERVO9 58
M10 SERVO10 59
M11 SERVO11 60
M12 SERVO12 61
M13 SERVO13 62
M14 SERVO14 63
M15 SERVO15 64
M16 SERVO16 65

Example: To use M14 as a relay, set Relay_pin=63.

Analog Input

The X25 EVO has three analog input ports: ADC Pin13 → ADC 3.3V ADC Pin12 → ADC 6.6V ADC Pin10 → RSSI

RSSI

The X25 EVO has an RSSI (voltage signal) telemetry strength monitoring port. Enable it by setting the following parameters:

  • 'RSSI_TYPE' = 1
  • 'RSSI_ANA_PIN' = 10

Compass/Magnetometer

The X25 EVO has a built-in RM3100 compass. However, due to potential interference, this board is usually used with an external I2C compass (as part of a GPS/compass combination). Priority should be given to using the external compass (e.g., the compass on a GPS) as the primary compass.

Ethernet Port Configuration

The X25 EVO has an ETH port. Configure it by following the ArduPilot Ethernet Configuration Tutorial.

Development Guide

[!COMMENT] CUAV does not provide technical guidance for secondary development of firmware or software. For related questions, please carefully read the relevant guides or seek assistance from the ArduPilot discordchannel.

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