OSD driver for the ATXXXX chip that is mounted on the OmnibusF4SD board for example.
It can be enabled with the OSD_ATXXXX_CFG parameter.
atxxxx <command> [arguments...] Commands: start Start the driver [-b <val>] SPI bus (default: use board-specific bus) stop status print status info
Smart battery driver for the BQ40Z50 fuel gauge IC.
To write to flash to set parameters. address, number_of_bytes, byte0, ... , byteN
batt_smbus -X write_flash 19069 2 27 0
batt_smbus <command> [arguments...] Commands: start [-X <val>] ullpt default: BATT_SMBUS_BUS_I2C_EXTERNAL [-T <val>] ullpt default: BATT_SMBUS_BUS_I2C_EXTERNAL1 [-R <val>] ullpt default: BATT_SMBUS_BUS_I2C_EXTERNAL2 [-I <val>] ullpt default: BATT_SMBUS_BUS_I2C_INTERNAL [-A <val>] ullpt default: BATT_SMBUS_BUS_ALL man_info Prints manufacturer info. report Prints the last report. unseal Unseals the devices flash memory to enable write_flash commands. seal Seals the devices flash memory to disbale write_flash commands. suspend Suspends the driver from rescheduling the cycle. resume Resumes the driver from suspension. write_flash Writes to flash. The device must first be unsealed with the unseal command. [address] The address to start writing. [number of bytes] Number of bytes to send. [data...data[n]] One byte of data at a time separated by spaces.
This module is responsible for driving the output and reading the input pins. For boards without a separate IO chip (eg. Pixracer), it uses the main channels. On boards with an IO chip (eg. Pixhawk), it uses the AUX channels, and the px4io driver is used for main ones.
It listens on the actuator_controls topics, does the mixing and writes the PWM outputs.
The module is configured via mode_* commands. This defines which of the first N pins the driver should occupy. By using mode_pwm4 for example, pins 5 and 6 can be used by the camera trigger driver or by a PWM rangefinder driver. Alternatively, the fmu can be started in one of the capture modes, and then drivers can register a capture callback with ioctl calls.
By default the module runs on a work queue with a callback on the uORB actuator_controls topic.
It is typically started with:
To drive all available pins.
Capture input (rising and falling edges) and print on the console: start the fmu in one of the capture modes:
This will enable capturing on the 4th pin. Then do:
pwm command for further configurations (PWM rate, levels, ...), and the
mixer command to load
fmu <command> [arguments...] Commands: start Start the task (without any mode set, use any of the mode_* cmds) All of the mode_* commands will start the fmu if not running already mode_gpio mode_pwm Select all available pins as PWM mode_pwm8 mode_pwm6 mode_pwm5 mode_pwm5cap1 mode_pwm4 mode_pwm4cap1 mode_pwm4cap2 mode_pwm3 mode_pwm3cap1 mode_pwm2 mode_pwm2cap2 mode_pwm1 sensor_reset Do a sensor reset (SPI bus) [<ms>] Delay time in ms between reset and re-enabling peripheral_reset Reset board peripherals [<ms>] Delay time in ms between reset and re-enabling i2c Configure I2C clock rate <bus_id> <rate> Specify the bus id (>=0) and rate in Hz test Test inputs and outputs fake Arm and send an actuator controls command <roll> <pitch> <yaw> <thrust> Control values in range [-100, 100] stop status print status info
GPS driver module that handles the communication with the device and publishes the position via uORB. It supports multiple protocols (device vendors) and by default automatically selects the correct one.
The module supports a secondary GPS device, specified via
-e parameter. The position will be published
on the second uORB topic instance, but it's currently not used by the rest of the system (however the
data will be logged, so that it can be used for comparisons).
There is a thread for each device polling for data. The GPS protocol classes are implemented with callbacks so that they can be used in other projects as well (eg. QGroundControl uses them too).
For testing it can be useful to fake a GPS signal (it will signal the system that it has a valid position):
gps stop gps start -f
Starting 2 GPS devices (the main GPS on /dev/ttyS3 and the secondary on /dev/ttyS4):
gps start -d /dev/ttyS3 -e /dev/ttyS4
Initiate warm restart of GPS device
gps reset warm
gps <command> [arguments...] Commands: start [-d <val>] GPS device values: <file:dev>, default: /dev/ttyS3 [-b <val>] Baudrate (can also be p:<param_name>) default: 0 [-e <val>] Optional secondary GPS device values: <file:dev> [-g <val>] Baudrate (secondary GPS, can also be p:<param_name>) default: 0 [-f] Fake a GPS signal (useful for testing) [-s] Enable publication of satellite info [-i <val>] GPS interface values: spi|uart, default: uart [-p <val>] GPS Protocol (default=auto select) values: ubx|mtk|ash|eml stop status print status info reset Reset GPS device cold|warm|hot Specify reset type
Ultrasonic range finder driver that handles the communication with the device and publishes the distance via uORB.
This driver is implented as a NuttX task. This Implementation was chosen due to the need for polling on a message via UART, which is not supported in the work_queue. This driver continuously takes range measurements while it is running. A simple algorithm to detect false readings is implemented at the driver levelin an attemptto improve the quality of data that is being published. The driver will not publish data at all if it deems the sensor data to be invalid or unstable.
pga460 <command> [arguments...] Commands: start <device_path> [device_path] The pga460 sensor device path, (e.g: /dev/ttyS6 status stop help
Driver for simulated PWM outputs.
Its only function is to take
actuator_control uORB messages,
mix them with any loaded mixer and output the result to the
actuator_output uORB topic.
It is used in SITL and HITL.
pwm_out_sim <command> [arguments...] Commands: start Start the task in mode_pwm16 All of the mode_* commands will start the pwm sim if not running already mode_pwm use 8 PWM outputs mode_pwm16 use 16 PWM outputs stop status print status info
This module does the RC input parsing and auto-selecting the method. Supported methods are:
- TBS Crossfire (CRSF)
By default the module runs on the work queue, to reduce RAM usage. It can also be run in its own thread, specified via start flag -t, to reduce latency. When running on the work queue, it schedules at a fixed frequency.
rc_input <command> [arguments...] Commands: start Start the task (without any mode set, use any of the mode_* cmds) [-t] Run as separate task instead of the work queue [-d <val>] RC device values: <file:dev>, default: /dev/ttyS3 bind Send a DSM bind command (module must be running) stop status print status info
This driver communicates over UART with the Roboclaw motor driver. It performs two tasks:
- Control the motors based on the
- Read the wheel encoders and publish the raw data in the
In order to use this driver, the Roboclaw should be put into Packet Serial mode (see the linked documentation), and
your flight controller's UART port should be connected to the Roboclaw as shown in the documentation. For Pixhawk 4,
UART & I2C B port, which corresponds to
The main loop of this module (Located in
RoboClaw.cpp::task_main()) performs 2 tasks:
actuator_controls_0messages to the Roboclaw as they become available
- Read encoder data from the Roboclaw at a constant, fixed rate.
Because of the latency of UART, this driver does not write every single
actuator_controls_0 message to the Roboclaw
immediately. Instead, it is rate limited based on the parameter
On startup, this driver will attempt to read the status of the Roboclaw to verify that it is connected. If this fails, the driver terminates immediately.
The command to start this driver is:
$ roboclaw start
<device> is the name of the UART port. On the Pixhawk 4, this is
<baud> is te baud rate.
All available commands are:
$ roboclaw start <device> <baud>
$ roboclaw status
$ roboclaw stop
roboclaw <command> [arguments...] Commands:
This module is responsible for the safety button.
safety_button <command> [arguments...] Commands: start Start the safety button driver
This module controls the TAP_ESC hardware via UART. It listens on the actuator_controls topics, does the mixing and writes the PWM outputs.
Currently the module is implementd as a threaded version only, meaning that it runs in its own thread instead of on the work queue.
The module is typically started with: tap_esc start -d /dev/ttyS2 -n <1-8>1-8>
tap_esc <command> [arguments...] Commands: start Start the task [-d <val>] Device used to talk to ESCs values: <device> [-n <val>] Number of ESCs default: 4
Mount (Gimbal) control driver. It maps several different input methods (eg. RC or MAVLink) to a configured output (eg. AUX channels or MAVLink).
Documentation how to use it is on the gimbal_control page.
Each method is implemented in its own class, and there is a common base class for inputs and outputs.
They are connected via an API, defined by the
ControlData data structure. This makes sure that each input method
can be used with each output method and new inputs/outputs can be added with minimal effort.
Test the output by setting a fixed yaw angle (and the other axes to 0):
vmount stop vmount test yaw 30
vmount <command> [arguments...] Commands: start test Test the output: set a fixed angle for one axis (vmount must not be running) roll|pitch|yaw <angle> Specify an axis and an angle in degrees stop status print status info