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【RK3399Pro学习笔记】十九、在ROS中点亮LED灯

code • 2022-5-13 • python • 阅读 68

【RK3399Pro学习笔记】十九、在ROS中点亮LED灯,第1张

目录
  • 创建ROS工作空间
  • 创建ROS功能包
    • C++
      • SysFs方式（需root）
        • 源文件
          • blink.cpp
          • gpiolib.cpp
        • 头文件
          • gpiolib.h
        • CMakeLists.txt
        • 运行代码
      • 调用shell命令方式（无需root）
        • 源文件
          • blink.cpp
        • CMakeLists.txt
        • 运行代码

平台：华硕 Thinker Edge R 瑞芯微 RK3399Pro
固件版本：Tinker_Edge_R-Debian-Stretch-V1.0.4-20200615

创建ROS工作空间 
mkdir -p ~/catkin_ws/src
cd ~/catkin_ws/src
catkin_init_workspace

回到工作目录根空间使用catkin_make命令编译整个空间：

cd ~/catkin_ws/
catkin_make
创建ROS功能包

进入工作空间，使用catkin_create_pkg命令创建功能包：

cd ~/catkin_ws/src
catkin_create_pkg ROS_Test_LED std_msgs rospy roscpp
C++

（参考ROS 树莓派小车制作（一） ——ROS “点灯” —— 支链）
为了更具普适性，这里使用自定义的源码（来自SysFs方式下C语言控制GPIO（RK3399）—— 姚家湾）来点灯，其它方式见【RK3399Pro学习笔记】十八、点亮LED灯（python、C语言、bash）

SysFs方式（需root） 源文件 
cd ~/catkin_ws/src/ROS_Test_LED/src
blink.cpp 
nano blink.cpp

#include "ros/ros.h"
#include "std_msgs/Bool.h"

#include 
#include "ROS_Test_LED/gpiolib.h"

void blink_callback(const std_msgs::Bool::ConstPtr& msg)
{
    gpio_export(73);
	if(msg->data==1)
    {
		gpio_write(73, 0);
		ROS_INFO("LED ON");
	}

	if(msg->data==0)
    {
		gpio_write(73, 1);
		ROS_INFO("LED OFF");
	}
    gpio_unexport(73);
}

int main(int argc,char** argv)
{
	ros::init(argc,argv,"blink_led");
	ROS_INFO("Started Blink Node");
    
	ros::NodeHandle n;
	ros::Subscriber sub=n.subscribe("led_blink",10,blink_callback);
	ros::spin();
}
gpiolib.cpp 
nano gpiolib.cpp

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include "ROS_Test_LED/gpiolib.h"

int gpio_direction(int gpio, int dir)
{
    int ret = 0;
    char buf[50];
    sprintf(buf, "/sys/class/gpio/gpio%d/direction", gpio);
    int gpiofd = open(buf, O_WRONLY);
    if (gpiofd < 0)
    {
        perror("Couldn't open IRQ file");
        ret = -1;
    }

    if (dir == 2 && gpiofd)
    {
        if (3 != write(gpiofd, "high", 3))
        {
            perror("Couldn't set GPIO direction to out");
            ret = -2;
        }
    }

    if (dir == 1 && gpiofd)
    {
        if (3 != write(gpiofd, "out", 3))
        {
            perror("Couldn't set GPIO direction to out");
            ret = -3;
        }
    }
    else if (gpiofd)
    {
        if (2 != write(gpiofd, "in", 2))
        {
            perror("Couldn't set GPIO directio to in");
            ret = -4;
        }
    }

    close(gpiofd);
    return ret;
}

int gpio_setedge(int gpio, int rising, int falling)
{
    int ret = 0;
    char buf[50];
    sprintf(buf, "/sys/class/gpio/gpio%d/edge", gpio);
    int gpiofd = open(buf, O_WRONLY);
    if (gpiofd < 0)
    {
        perror("Couldn't open IRQ file");
        ret = -1;
    }

    if (gpiofd && rising && falling)
    {
        if (4 != write(gpiofd, "both", 4))
        {
            perror("Failed to set IRQ to both falling & rising");
            ret = -2;
        }
    }
    else
    {
        if (rising && gpiofd)
        {
            if (6 != write(gpiofd, "rising", 6))
            {
                perror("Failed to set IRQ to rising");
                ret = -2;
            }
        }
        else if (falling && gpiofd)
        {
            if (7 != write(gpiofd, "falling", 7))
            {
                perror("Failed to set IRQ to falling");
                ret = -3;
            }
        }
    }

    close(gpiofd);

    return ret;
}

int gpio_export(int gpio)
{
    int efd;
    char buf[50];
    int gpiofd, ret;

    /* Quick test if it has already been exported */
    sprintf(buf, "/sys/class/gpio/gpio%d/value", gpio);
    efd = open(buf, O_WRONLY);
    if (efd != -1)
    {
        close(efd);
        return 0;
    }

    efd = open("/sys/class/gpio/export", O_WRONLY);

    if (efd != -1)
    {
        sprintf(buf, "%d", gpio);
        ret = write(efd, buf, strlen(buf));
        if (ret < 0)
        {
            perror("Export failed");
            return -2;
        }
        close(efd);
    }
    else
    {
        // If we can't open the export file, we probably
        // dont have any gpio permissions
        return -1;
    }
    return 0;
}

void gpio_unexport(int gpio)
{
    int gpiofd, ret;
    char buf[50];
    gpiofd = open("/sys/class/gpio/unexport", O_WRONLY);
    sprintf(buf, "%d", gpio);
    ret = write(gpiofd, buf, strlen(buf));
    close(gpiofd);
}

int gpio_getfd(int gpio)
{
    char in[3] = {0, 0, 0};
    char buf[50];
    int gpiofd;
    sprintf(buf, "/sys/class/gpio/gpio%d/value", gpio);
    gpiofd = open(buf, O_RDWR);
    if (gpiofd < 0)
    {
        fprintf(stderr, "Failed to open gpio %d value\n", gpio);
        perror("gpio failed");
    }

    return gpiofd;
}

int gpio_read(int gpio)
{
    char in[3] = {0, 0, 0};
    char buf[50];
    int nread, gpiofd;
    sprintf(buf, "/sys/class/gpio/gpio%d/value", gpio);
    gpiofd = open(buf, O_RDWR);
    if (gpiofd < 0)
    {
        fprintf(stderr, "Failed to open gpio %d value\n", gpio);
        perror("gpio failed");
    }

    do
    {
        nread = read(gpiofd, in, 1);
    } while (nread == 0);
    if (nread == -1)
    {
        perror("GPIO Read failed");
        return -1;
    }

    close(gpiofd);
    return atoi(in);
}

int gpio_write(int gpio, int val)
{
    char buf[50];
    int nread, ret, gpiofd;
    sprintf(buf, "/sys/class/gpio/gpio%d/value", gpio);
    gpiofd = open(buf, O_RDWR);
    if (gpiofd > 0)
    {
        snprintf(buf, 2, "%d", val);
        ret = write(gpiofd, buf, 2);
        if (ret < 0)
        {
            perror("failed to set gpio");
            return 1;
        }

        close(gpiofd);
        if (ret == 2)
            return 0;
    }
    return 1;
}

int gpio_select(int gpio)
{
    char gpio_irq[64];
    int ret = 0, buf, irqfd;
    fd_set fds;
    FD_ZERO(&fds);

    snprintf(gpio_irq, sizeof(gpio_irq), "/sys/class/gpio/gpio%d/value", gpio);
    irqfd = open(gpio_irq, O_RDONLY, S_IREAD);
    if (irqfd < 1)
    {
        perror("Couldn't open the value file");
        return -13;
    }

    // Read first since there is always an initial status
    ret = read(irqfd, &buf, sizeof(buf));

    while (1)
    {
        FD_SET(irqfd, &fds);
        ret = select(irqfd + 1, NULL, NULL, &fds, NULL);
        if (FD_ISSET(irqfd, &fds))
        {
            FD_CLR(irqfd, &fds); // Remove the filedes from set
            // Clear the junk data in the IRQ file
            ret = read(irqfd, &buf, sizeof(buf));
            return 1;
        }
    }
}
头文件 
cd ~/catkin_ws/src/ROS_Test_LED/include/ROS_Test_LED
gpiolib.h 
nano gpiolib.h

#ifndef _GPIOLIB_H_
#define _GPIOLIB_H_

/* returns -1 or the file descriptor of the gpio value file */
int gpio_export(int gpio);
/* Set direction to 2 = high output, 1 low output, 0 input */
int gpio_direction(int gpio, int dir);
/* Release the GPIO to be claimed by other processes or a kernel driver */
void gpio_unexport(int gpio);
/* Single GPIO read */
int gpio_read(int gpio);
/* Set GPIO to val (1 = high) */
int gpio_write(int gpio, int val);
/* Set which edge(s) causes the value select to return */
int gpio_setedge(int gpio, int rising, int falling);
/* Blocks on select until GPIO toggles on edge */
int gpio_select(int gpio);

/* Return the GPIO file descriptor */
int gpio_getfd(int gpio);

#endif //_GPIOLIB_H_
CMakeLists.txt 
nano ~/catkin_ws/src/ROS_Test_LED/CMakeLists.txt

cmake_minimum_required(VERSION 3.0.2)
project(ROS_Test_LED)

## Compile as C++11, supported in ROS Kinetic and newer
# add_compile_options(-std=c++11)

## Find catkin macros and libraries
## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
## is used, also find other catkin packages
find_package(catkin REQUIRED COMPONENTS
  roscpp
  rospy
  std_msgs
)

## System dependencies are found with CMake's conventions
# find_package(Boost REQUIRED COMPONENTS system)


## Uncomment this if the package has a setup.py. This macro ensures
## modules and global scripts declared therein get installed
## See http://ros.org/doc/api/catkin/html/user_guide/setup_dot_py.html
# catkin_python_setup()

################################################
## Declare ROS messages, services and actions ##
################################################

## To declare and build messages, services or actions from within this
## package, follow these steps:
## * Let MSG_DEP_SET be the set of packages whose message types you use in
##   your messages/services/actions (e.g. std_msgs, actionlib_msgs, ...).
## * In the file package.xml:
##   * add a build_depend tag for "message_generation"
##   * add a build_depend and a exec_depend tag for each package in MSG_DEP_SET
##   * If MSG_DEP_SET isn't empty the following dependency has been pulled in
##     but can be declared for certainty nonetheless:
##     * add a exec_depend tag for "message_runtime"
## * In this file (CMakeLists.txt):
##   * add "message_generation" and every package in MSG_DEP_SET to
##     find_package(catkin REQUIRED COMPONENTS ...)
##   * add "message_runtime" and every package in MSG_DEP_SET to
##     catkin_package(CATKIN_DEPENDS ...)
##   * uncomment the add_*_files sections below as needed
##     and list every .msg/.srv/.action file to be processed
##   * uncomment the generate_messages entry below
##   * add every package in MSG_DEP_SET to generate_messages(DEPENDENCIES ...)

## Generate messages in the 'msg' folder
# add_message_files(
#   FILES
#   Message1.msg
#   Message2.msg
# )

## Generate services in the 'srv' folder
# add_service_files(
#   FILES
#   Service1.srv
#   Service2.srv
# )

## Generate actions in the 'action' folder
# add_action_files(
#   FILES
#   Action1.action
#   Action2.action
# )

## Generate added messages and services with any dependencies listed here
# generate_messages(
#   DEPENDENCIES
#   std_msgs
# )

################################################
## Declare ROS dynamic reconfigure parameters ##
################################################

## To declare and build dynamic reconfigure parameters within this
## package, follow these steps:
## * In the file package.xml:
##   * add a build_depend and a exec_depend tag for "dynamic_reconfigure"
## * In this file (CMakeLists.txt):
##   * add "dynamic_reconfigure" to
##     find_package(catkin REQUIRED COMPONENTS ...)
##   * uncomment the "generate_dynamic_reconfigure_options" section below
##     and list every .cfg file to be processed

## Generate dynamic reconfigure parameters in the 'cfg' folder
# generate_dynamic_reconfigure_options(
#   cfg/DynReconf1.cfg
#   cfg/DynReconf2.cfg
# )

###################################
## catkin specific configuration ##
###################################
## The catkin_package macro generates cmake config files for your package
## Declare things to be passed to dependent projects
## INCLUDE_DIRS: uncomment this if your package contains header files
## LIBRARIES: libraries you create in this project that dependent projects also need
## CATKIN_DEPENDS: catkin_packages dependent projects also need
## DEPENDS: system dependencies of this project that dependent projects also need
catkin_package(
#  INCLUDE_DIRS include
#  LIBRARIES ROS_Test_LED
#  CATKIN_DEPENDS roscpp rospy std_msgs
#  DEPENDS system_lib
)

###########
## Build ##
###########

## Specify additional locations of header files
## Your package locations should be listed before other locations
include_directories(
  include
  ${catkin_INCLUDE_DIRS}
)

## Declare a C++ library
# add_library(${PROJECT_NAME}
#   src/${PROJECT_NAME}/ROS_Test_LED.cpp
# )

                                    ## 用来手动链接头文件和源文件
add_library(gpiolib                 ## 自定义的链接库名，后面用来识别
    include/ROS_Test_LED/gpiolib.h  ## 头文件的路径
    src/gpiolib.cpp                 ## 源文件的路径
)
add_dependencies(gpiolib ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})
target_link_libraries(gpiolib 
    ${catkin_LIBRARIES}
)

## Add cmake target dependencies of the library
## as an example, code may need to be generated before libraries
## either from message generation or dynamic reconfigure
# add_dependencies(${PROJECT_NAME} ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})

## Declare a C++ executable
## With catkin_make all packages are built within a single CMake context
## The recommended prefix ensures that target names across packages don't collide
# add_executable(${PROJECT_NAME}_node src/ROS_Test_LED_node.cpp)

add_executable(blink_led src/blink.cpp)

## Rename C++ executable without prefix
## The above recommended prefix causes long target names, the following renames the
## target back to the shorter version for ease of user use
## e.g. "rosrun someones_pkg node" instead of "rosrun someones_pkg someones_pkg_node"
# set_target_properties(${PROJECT_NAME}_node PROPERTIES OUTPUT_NAME node PREFIX "")

## Add cmake target dependencies of the executable
## same as for the library above
# add_dependencies(${PROJECT_NAME}_node ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})

## Specify libraries to link a library or executable target against
# target_link_libraries(${PROJECT_NAME}_node
#   ${catkin_LIBRARIES}
# )

add_dependencies(blink_led ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})
target_link_libraries(blink_led 
    gpiolib
    ${catkin_LIBRARIES}
)

#############
## Install ##
#############

# all install targets should use catkin DESTINATION variables
# See http://ros.org/doc/api/catkin/html/adv_user_guide/variables.html

## Mark executable scripts (Python etc.) for installation
## in contrast to setup.py, you can choose the destination
# catkin_install_python(PROGRAMS
#   scripts/my_python_script
#   DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
# )

## Mark executables for installation
## See http://docs.ros.org/melodic/api/catkin/html/howto/format1/building_executables.html
# install(TARGETS ${PROJECT_NAME}_node
#   RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
# )

## Mark libraries for installation
## See http://docs.ros.org/melodic/api/catkin/html/howto/format1/building_libraries.html
# install(TARGETS ${PROJECT_NAME}
#   ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
#   LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
#   RUNTIME DESTINATION ${CATKIN_GLOBAL_BIN_DESTINATION}
# )

## Mark cpp header files for installation
# install(DIRECTORY include/${PROJECT_NAME}/
#   DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
#   FILES_MATCHING PATTERN "*.h"
#   PATTERN ".svn" EXCLUDE
# )

## Mark other files for installation (e.g. launch and bag files, etc.)
# install(FILES
#   # myfile1
#   # myfile2
#   DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
# )

#############
## Testing ##
#############

## Add gtest based cpp test target and link libraries
# catkin_add_gtest(${PROJECT_NAME}-test test/test_ROS_Test_LED.cpp)
# if(TARGET ${PROJECT_NAME}-test)
#   target_link_libraries(${PROJECT_NAME}-test ${PROJECT_NAME})
# endif()

## Add folders to be run by python nosetests
# catkin_add_nosetests(test)

回到工作空间根目录进行编译

cd ~/catkin_ws
catkin_make
运行代码

由于控制GPIO需要root权限，故ros相关命令也要以root身份执行：
新建一个终端

sudo -s
source ./catkin_ws/devel/setup.bash
roscore

新建一个终端

sudo -s
source ./catkin_ws/devel/setup.bash
rosrun ROS_Test_LED blink_led

新建一个终端

sudo -s
source ./catkin_ws/devel/setup.bash

改变电平：

rostopic pub /led_blink std_msgs/Bool 1


rostopic pub /led_blink std_msgs/Bool 0

新建一个终端

rqt_graph

调用shell命令方式（无需root） 源文件 
cd ~/catkin_ws/src/ROS_Test_LED/src
blink.cpp 
nano blink.cpp

#include "ros/ros.h"
#include "std_msgs/Bool.h"

#include 
#include 

void blink_callback(const std_msgs::Bool::ConstPtr& msg)
{
	if(msg->data==1)
    {
		system("gpio write 8 0");
		ROS_INFO("LED ON");
	}

	if(msg->data==0)
    {
		system("gpio write 8 1");
		ROS_INFO("LED OFF");
	}
}

int main(int argc,char** argv)
{
	ros::init(argc,argv,"blink_led");
	ROS_INFO("Started Blink Node");
	system("gpio mode 8 out");
	system("gpio write 8 1");
	ros::NodeHandle n;
	ros::Subscriber sub=n.subscribe("led_blink",10,blink_callback);
	ros::spin();
}

其中8为wiringPi的引脚编号，可通过gpio readall命令查看

CMakeLists.txt 
nano ~/catkin_ws/src/ROS_Test_LED/CMakeLists.txt

cmake_minimum_required(VERSION 3.0.2)
project(ROS_Test_LED)

## Compile as C++11, supported in ROS Kinetic and newer
# add_compile_options(-std=c++11)

## Find catkin macros and libraries
## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
## is used, also find other catkin packages
find_package(catkin REQUIRED COMPONENTS
  roscpp
  rospy
  std_msgs
)

## System dependencies are found with CMake's conventions
# find_package(Boost REQUIRED COMPONENTS system)


## Uncomment this if the package has a setup.py. This macro ensures
## modules and global scripts declared therein get installed
## See http://ros.org/doc/api/catkin/html/user_guide/setup_dot_py.html
# catkin_python_setup()

################################################
## Declare ROS messages, services and actions ##
################################################

## To declare and build messages, services or actions from within this
## package, follow these steps:
## * Let MSG_DEP_SET be the set of packages whose message types you use in
##   your messages/services/actions (e.g. std_msgs, actionlib_msgs, ...).
## * In the file package.xml:
##   * add a build_depend tag for "message_generation"
##   * add a build_depend and a exec_depend tag for each package in MSG_DEP_SET
##   * If MSG_DEP_SET isn't empty the following dependency has been pulled in
##     but can be declared for certainty nonetheless:
##     * add a exec_depend tag for "message_runtime"
## * In this file (CMakeLists.txt):
##   * add "message_generation" and every package in MSG_DEP_SET to
##     find_package(catkin REQUIRED COMPONENTS ...)
##   * add "message_runtime" and every package in MSG_DEP_SET to
##     catkin_package(CATKIN_DEPENDS ...)
##   * uncomment the add_*_files sections below as needed
##     and list every .msg/.srv/.action file to be processed
##   * uncomment the generate_messages entry below
##   * add every package in MSG_DEP_SET to generate_messages(DEPENDENCIES ...)

## Generate messages in the 'msg' folder
# add_message_files(
#   FILES
#   Message1.msg
#   Message2.msg
# )

## Generate services in the 'srv' folder
# add_service_files(
#   FILES
#   Service1.srv
#   Service2.srv
# )

## Generate actions in the 'action' folder
# add_action_files(
#   FILES
#   Action1.action
#   Action2.action
# )

## Generate added messages and services with any dependencies listed here
# generate_messages(
#   DEPENDENCIES
#   std_msgs
# )

################################################
## Declare ROS dynamic reconfigure parameters ##
################################################

## To declare and build dynamic reconfigure parameters within this
## package, follow these steps:
## * In the file package.xml:
##   * add a build_depend and a exec_depend tag for "dynamic_reconfigure"
## * In this file (CMakeLists.txt):
##   * add "dynamic_reconfigure" to
##     find_package(catkin REQUIRED COMPONENTS ...)
##   * uncomment the "generate_dynamic_reconfigure_options" section below
##     and list every .cfg file to be processed

## Generate dynamic reconfigure parameters in the 'cfg' folder
# generate_dynamic_reconfigure_options(
#   cfg/DynReconf1.cfg
#   cfg/DynReconf2.cfg
# )

###################################
## catkin specific configuration ##
###################################
## The catkin_package macro generates cmake config files for your package
## Declare things to be passed to dependent projects
## INCLUDE_DIRS: uncomment this if your package contains header files
## LIBRARIES: libraries you create in this project that dependent projects also need
## CATKIN_DEPENDS: catkin_packages dependent projects also need
## DEPENDS: system dependencies of this project that dependent projects also need
catkin_package(
#  INCLUDE_DIRS include
#  LIBRARIES ROS_Test_LED
#  CATKIN_DEPENDS roscpp rospy std_msgs
#  DEPENDS system_lib
)

###########
## Build ##
###########

## Specify additional locations of header files
## Your package locations should be listed before other locations
include_directories(
  include
  ${catkin_INCLUDE_DIRS}
)

## Declare a C++ library
# add_library(${PROJECT_NAME}
#   src/${PROJECT_NAME}/ROS_Test_LED.cpp
# )

## Add cmake target dependencies of the library
## as an example, code may need to be generated before libraries
## either from message generation or dynamic reconfigure
# add_dependencies(${PROJECT_NAME} ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})

## Declare a C++ executable
## With catkin_make all packages are built within a single CMake context
## The recommended prefix ensures that target names across packages don't collide
# add_executable(${PROJECT_NAME}_node src/ROS_Test_LED_node.cpp)

add_executable(blink_led src/blink.cpp)

## Rename C++ executable without prefix
## The above recommended prefix causes long target names, the following renames the
## target back to the shorter version for ease of user use
## e.g. "rosrun someones_pkg node" instead of "rosrun someones_pkg someones_pkg_node"
# set_target_properties(${PROJECT_NAME}_node PROPERTIES OUTPUT_NAME node PREFIX "")

## Add cmake target dependencies of the executable
## same as for the library above
# add_dependencies(${PROJECT_NAME}_node ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})

## Specify libraries to link a library or executable target against
# target_link_libraries(${PROJECT_NAME}_node
#   ${catkin_LIBRARIES}
# )

add_dependencies(blink_led ${${PROJECT_NAME}_EXPORTED_TARGETS} ${catkin_EXPORTED_TARGETS})
target_link_libraries(blink_led 
    ${catkin_LIBRARIES}
)

#############
## Install ##
#############

# all install targets should use catkin DESTINATION variables
# See http://ros.org/doc/api/catkin/html/adv_user_guide/variables.html

## Mark executable scripts (Python etc.) for installation
## in contrast to setup.py, you can choose the destination
# catkin_install_python(PROGRAMS
#   scripts/my_python_script
#   DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
# )

## Mark executables for installation
## See http://docs.ros.org/melodic/api/catkin/html/howto/format1/building_executables.html
# install(TARGETS ${PROJECT_NAME}_node
#   RUNTIME DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION}
# )

## Mark libraries for installation
## See http://docs.ros.org/melodic/api/catkin/html/howto/format1/building_libraries.html
# install(TARGETS ${PROJECT_NAME}
#   ARCHIVE DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
#   LIBRARY DESTINATION ${CATKIN_PACKAGE_LIB_DESTINATION}
#   RUNTIME DESTINATION ${CATKIN_GLOBAL_BIN_DESTINATION}
# )

## Mark cpp header files for installation
# install(DIRECTORY include/${PROJECT_NAME}/
#   DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
#   FILES_MATCHING PATTERN "*.h"
#   PATTERN ".svn" EXCLUDE
# )

## Mark other files for installation (e.g. launch and bag files, etc.)
# install(FILES
#   # myfile1
#   # myfile2
#   DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
# )

#############
## Testing ##
#############

## Add gtest based cpp test target and link libraries
# catkin_add_gtest(${PROJECT_NAME}-test test/test_ROS_Test_LED.cpp)
# if(TARGET ${PROJECT_NAME}-test)
#   target_link_libraries(${PROJECT_NAME}-test ${PROJECT_NAME})
# endif()

## Add folders to be run by python nosetests
# catkin_add_nosetests(test)

回到工作空间根目录进行编译

cd ~/catkin_ws
catkin_make
运行代码

新建一个终端

source ~/catkin_ws/devel/setup.bash
roscore

新建一个终端

source ~/catkin_ws/devel/setup.bash
rosrun ROS_Test_LED blink_led

新建一个终端

source ~/catkin_ws/devel/setup.bash

改变电平：

rostopic pub /led_blink std_msgs/Bool 1

rostopic pub /led_blink std_msgs/Bool 0

新建一个终端

rqt_graph

欢迎分享，转载请注明来源：内存溢出

原文地址: http://outofmemory.cn/langs/873966.html

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