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likeyousmile
Learning-ROS
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my_controller.cpp
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my_controller.cpp
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#include <controller_interface/controller.h>
#include <hardware_interface/joint_command_interface.h>
#include <pluginlib/class_list_macros.h>
// 导入创建控制器和创建命名空间的包
namespace controller_ns {
// 仅控制用 effort 界面/接口的关节
class PositionController : public controller_interface::Controller<
hardware_interface::EffortJointInterface> {
public:
//创建init函数,当加载控制器管理器时会被调用
// 在该函数中,可以从参数服务器得到所控制的关节名称,并实现实时控制
bool init(hardware_interface::EffortJointInterface *hw, ros::NodeHandle &n) {
std::string my_joint;
if (!n.getParam("joint", my_joint)) {
ROS_ERROR("Could not find joint name");
return false;
}
joint_ = hw->getHandle(my_joint); // throws on failure
return true;
}
// 定义传入关节的控制命令
// 此例子里,就是error*gain的积
// error是用目标位置减去当前位置来定义的
void update(const ros::Time &time, const ros::Duration &period) {
double error = setpoint_ - joint_.getPosition();
joint_.setCommand(error * gain_);
}
//开启控制器
void starting(const ros::Time &time) {}
//关闭控制器
void stopping(const ros::Time &time) {}
// float和double不属于积分或枚举类型,所以它们必须被声明为constexpr,或者非静态。
private:
hardware_interface::JointHandle joint_;
static constexpr double gain_ = 2.25;
static constexpr double setpoint_ = 1.00;
};
// 加载特殊的marco 插入类,为了使该类动态的加载
PLUGINLIB_EXPORT_CLASS(controller_ns::PositionController,
controller_interface::ControllerBase);
} // namespace controller_ns
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