小車型號：scout－v2.0

https://github.com/agilexrobotics/scout_ros（所用包的下載地址）

或者

https://hub.fastgit.org/agilexrobotics/scout_ros

注意：使用https://github.com下載的很慢，可以采用國內鏡像替換https://www.jianshu.com/p/29824058380f

即

https://hub.fastgit.org/agilexrobotics/scout_ros

Communication interface setup

不用管前面得序號，直接一步一步敲命令

Setup UART

Generally your RS232-to-USB cable should be automatically recognized as "/dev/ttyUSB0" or something similar and ready for use. If you get the error "... permission denied ..." when trying to open the port, you need to grant access of the port to your user account:

$ sudo usermod -a -G dialout $USER

You need to re-login to get the change to take effect.

Setup CAN-To-USB adapter

Enable gs_usb kernel module

$ sudo modprobe gs_usb

Bringup can device

$ sudo ip link set can0 up type can bitrate 500000

If no error occured during the previous steps, you should be able to see the can device now by using command

$ ifconfig -a

Install and use can-utils to test the hardware

$ sudo apt install can-utils

Testing command

# receiving data from can0 $ candump can0 # send data to can0 $ cansend can0 001#1122334455667788

Install dependent libraries

$ sudo apt install -y libasio-dev $ sudo apt install -y ros-$ROS_DISTRO-teleop-twist-keyboard

Clone the packages into your catkin workspace and compile

(the following instructions assume your catkin workspace is at: ~/catkin_ws/src)

$ cd ~/catkin_ws/src $ git clone --recursive https://github.com/agilexrobotics/ugv_sdk.git $ git clone https://github.com/agilexrobotics/scout_ros.git $ cd .. $ catkin_make

if your car is 1.0 version,Please run this command to switch ugv_sdk to 1.0 version

$ cd ugv_sdk && git checkout master

then recompile

Launch ROS nodes

• Start the base node for scout

  $ roslaunch scout_bringup scout_minimal.launch

  The?scout_bringup/scout_minimal.launch?has 5 parameters:

  • port_name: specifies the port used to communicate with the robot, default = "can0"
  • simulated_robot: indicates if launching with a simulation, default = "false"
  • model_xacro: specifies the target ".xacro" file for the publishing of tf frames, default =?scout_v2.xacro
  • odom_topic_name: sets the name of the topic which calculated odometry is published to, defaults = "odom"
  • is_scout_mini:Suitable for chassis of type scout_mini,defaults = "false"

• Start the base node for scout-mini

  $ roslaunch scout_bringup scout_mini_minimal.launch

• Start the keyboard tele-op node

  $ roslaunch scout_bringup scout_teleop_keyboard.launch

一.catkin_make編譯時，總失敗，報錯如下：

param_demo.cpp:(.text+0x50)：對‘ros::init(int&, char**, std::string const&, unsigned int)’未定義的引用

param_demo.cpp:(.text+0x80)：對‘ros::NodeHandle::NodeHandle(std::string const&, std::map<std::string, std::string, std::less<std::string>, std::allocator<std::pair<std::string const, std::string> > > const&)’未定義的引用

param_demo.cpp:(.text+0xb8)：對‘ros::param::get(std::string const&, int&)’未定義的引用

param_demo.cpp:(.text+0x100)：對‘ros::NodeHandle::getParam(std::string const&, int&) const’未定義的引用

param_demo.cpp:(.text+0x1e8)：對‘ros::console::initializeLogLocation(ros::console::LogLocation*, std::string const&, ros::console::levels::Level)’未定義的引用

解決辦法：g++ 和gcc 版本不同造成編譯錯誤，參考https://blog.csdn.net/xrinosvip/article/details/81177873

修改成統一版本即可編譯成功！！！

命令如下：（查看版本）

gcc -v?

g++ -v

(修改g++ 和gcc的版本，選擇數字后回車即可，gcc 和g++ 必須統一才行！)

sudo update-alternatives --config g++

?sudo update-alternatives --config gcc

二．運行roslaunch scout_bringup scout_minimal.launch　報錯如下：

RLException: [scout_minimal.launch] is neither a launch file in package [scout_bringup] nor is [scout_bringup] a launch file name
The traceback for the exception was written to the log file
解決方案：在catkin_ws目錄下：source ./devel/setup.bash 即可解決

三．　nanjingtech@nanjingtech-desktop:~/catkin_ws2$ source ./devel/setup.bash
　　　nanjingtech@nanjingtech-desktop:~/catkin_ws2$ roslaunch scout_bringup scout_teleop_keyboard.launch　

報錯如下：

ModuleNotFoundError: No module named 'rospkg'
[teleop_keybord-1] process has died [pid 7638, exit code 1, cmd /opt/ros/melodic/lib/teleop_twist_keyboard/teleop_twist_keyboard.py __name:=teleop_keybord __log:=/home/nanjingtech/.ros/log/c9cfb1de-edf0-11eb-818c-845cf327b690/teleop_keybord-1.log].
log file: /home/nanjingtech/.ros/log/c9cfb1de-edf0-11eb-818c-845cf327b690/teleop_keybord-1*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete
done
解決方案參考https://blog.csdn.net/weixin_45688316/article/details/103697198

python版本的問題！！　

解決方案
因為ubuntu18.04使用的ros版本是melodic，而melodic默認使用的是python2，但是我們跑代碼實際用的是python3。
所以現在bashrc文件里加

alias python=python3

保存后

source ~/.bashrc

下載rospkg

pip3 install rospkg

問題解決
?

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