Camera Trigger Daemon

Frame Synchronization with external signal.

MTi 670/680 with GNSS ⇒ Send 1 PPS

ROScube X with mraa ⇒ GPIO ⇒ Trigger ISR + Camera

Installation

Neuron Library

Download Neuron Library from the link: https://github.com/Adlink-ROS/mraa/releases

And then install Neuron Library from the deb file:

# Example for RQX-58G
sudo apt install neuron-library_1.3.13_arm64_ubuntu1804.deb

Get the code

git clone https://github.com/Adlink-ROS/camera_trigger_daemon.git
cd camera_trigger_daemon/

Usage

Camera Sync Configuration

RQX-58G supports Free Run Mode and Frame Sync Mode.

• 0 -> Free Run mode
• 1 -> Frame Sync mode

For more details, you can go to Frame Synchronization.

Camera Daemon

We provide a daemon to trigger cameras when GPIO interrupts by external signal.

sudo python3 adlink_camera_sync [mode] [-f freq] [-t gpio_num] [-h help]

• mode:
  • sync:
    1. set frame sync mode
    2. enable isr if gpio_num != None
    3. enable trigger daemon
  • free:
    1. disable trigger daemon
    2. set free run mode
• While sync mode, supports two options
  • freq: the trigger frequency (default 5 Hz) range from 1 to 20 Hz
  • gpio_num: whether triggered by GPIO in
  • help: more detail about argument

Sync mode

# Trigger camera directly by 5 Hz(default) without ISR.
sudo python3 adlink_camera_sync sync
# Oprional: trigger camera by 10 Hz with ISR (from GPIO_NUM 5).
sudo python3 adlink_camera_sync sync -f 10 -t 5

Free mode

sudo python3 adlink_camera_sync free 

Warning

When run Sync mode, show the message "pidfile /tmp/daemon-example.pid already exist. Daemon already running?".

That means pid of daemon already exist, you need stop the daemon by running Free mode first.

If the daemon didn't work, please check the daemon.log file.