Revision 8de28e68
ID | 8de28e688f1c3ce392a9bd55ea7c4c6a6cd8592d |
Created structure for buttons node. Compiles. However event_button function is not written.
scout/buttons/CMakeLists.txt | ||
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#rosbuild_add_executable(example examples/example.cpp) |
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#target_link_libraries(example ${PROJECT_NAME}) |
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rosbuild_add_executable(motors_node src/motors.cpp) |
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rosbuild_add_executable(buttons_node src/buttons.cpp) |
scout/buttons/src/buttons.cpp | ||
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static int button2_pressed; /**< Whether or not button 2 is pressed. */ |
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/** |
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* @brief Sets motor speed
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* @brief Handles button events
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* |
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* Sets the motor speeds based on subscription to the set_motors topic.
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* Handles button events based on subscription to the button_event topic.
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* |
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* @param msg The message from the set_motors topic, containing speeds and
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* motor configuration settings.
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* @param msg The message from the button_event topic, containing buttons
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* statuses.
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*/ |
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void motors_set(const motors::set_motors::ConstPtr& msg)
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void event_button(const buttons::button_event::ConstPtr& msg)
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{ |
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/** @todo Edit to only set requested motors, not all */ |
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int which = msg->which; |
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if(which & MOTOR_FL_REV) |
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{ |
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motor_fl_speed = -1 * motors_rel_to_abs(msg->fl_speed, msg->units); |
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} |
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if(which & MOTOR_FR_REV) |
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{ |
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motor_fr_speed = -1 * motors_rel_to_abs(msg->fr_speed, msg->units); |
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} |
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if(which & MOTOR_BL_REV) |
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{ |
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motor_bl_speed = -1 * motors_rel_to_abs(msg->bl_speed, msg->units); |
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} |
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if(which & MOTOR_BR_REV) |
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{ |
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motor_br_speed = -1 * motors_rel_to_abs(msg->br_speed, msg->units); |
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} |
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if(which & MOTOR_FL) |
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{ |
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motor_fl_speed = motors_rel_to_abs(msg->fl_speed, msg->units); |
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} |
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if(which & MOTOR_FR) |
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{ |
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motor_fr_speed = motors_rel_to_abs(msg->fr_speed, msg->units); |
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} |
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if(which & MOTOR_BL) |
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{ |
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motor_bl_speed = motors_rel_to_abs(msg->bl_speed, msg->units); |
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} |
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if(which & MOTOR_BR) |
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{ |
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motor_br_speed = motors_rel_to_abs(msg->br_speed, msg->units); |
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} |
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/* Write speeds to hardware */ |
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/** @todo Add code to write speeds to hardware */ |
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//TODO: What goes here? |
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} |
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/** |
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* @brief Outputs current motor speeds
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* @brief Outputs whether or not the buttons are pressed.
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* |
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* Serves the service query_motors by responding to service requests with the
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* speeds of the motors.
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* Serves the service query_buttons by responding to service requests
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* with the status of the buttons
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* @param req The request. The only field is the units requested. |
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* @param res The response. The fields will be filled with values. |
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*/ |
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bool motors_query(motors::query_motors::Request &req,
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motors::query_motors::Response &res)
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bool buttons_query(buttons::query_buttons::Request &req,
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buttons::query_buttons::Response &res)
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{ |
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int units = req.units; |
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res.fl_speed = motors_abs_to_rel(motor_fl_speed, units); |
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res.fr_speed = motors_abs_to_rel(motor_fr_speed, units); |
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res.bl_speed = motors_abs_to_rel(motor_bl_speed, units); |
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res.br_speed = motors_abs_to_rel(motor_br_speed, units); |
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res.button1_pressed = button1_pressed; |
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res.button2_pressed = button2_pressed; |
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ROS_DEBUG("Motor speeds queried");
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ROS_DEBUG("Button status queried");
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return true; |
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} |
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/** |
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* @brief Converts set speeds (of various units) to absolute speeds. |
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* |
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* @param speed The speed expressed in the desired units |
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* @param units The units the desired speed is measured in |
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* @return The absolute speed of the motor |
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**/ |
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int motors_rel_to_abs(int rel_speed, int units) |
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{ |
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switch(units) |
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{ |
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case MOTOR_ABSOLUTE:/* Speed given as absolute */ |
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return rel_speed; |
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case MOTOR_PERCENT:/* Convert from percentage */ |
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return rel_speed * MAXSPEED / 100; |
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case MOTOR_MMS:/* Convert from mm/s */ |
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/** @todo Make math to do this conversion **/ |
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return rel_speed; |
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case MOTOR_CMS:/* Convert from cm/s */ |
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/** @todo Make math to do this conversion **/ |
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return rel_speed; |
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default: /* The units aren't recognized */ |
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/** @todo Decide on default case. Either percent or absolute. **/ |
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return rel_speed; |
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} |
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} |
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/** |
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* @brief Convert absolute speeds to speeds of various units. |
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* |
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* @param speed The speed expressed in absolute units. |
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* @param units The units the desired speed is measured in. |
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* @return The relative speed of the motor in desired units. |
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**/ |
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int motors_abs_to_rel(int abs_speed, int units) |
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{ |
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switch(units) |
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{ |
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case MOTOR_ABSOLUTE:/* Speed given as absolute */ |
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return abs_speed; |
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case MOTOR_PERCENT:/* Convert from percentage */ |
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return abs_speed * 100 / MAXSPEED; |
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case MOTOR_MMS:/* Convert from mm/s */ |
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/** @todo Make math to do this conversion **/ |
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return abs_speed; |
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case MOTOR_CMS:/* Convert from cm/s */ |
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/** @todo Make math to do this conversion **/ |
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return abs_speed; |
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default: /* The units aren't recognized */ |
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/** @todo Decide on default case. Either percent or absolute. **/ |
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return abs_speed; |
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} |
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} |
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/** |
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* @brief Motors driver. This is a ROS node that controls motor speeds.
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* @brief Buttons driver. This is a ROS node that queries button status.
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* |
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* This is the main function for the motors node. It is run when the node
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* starts and initializes the motors. It then subscribes to the
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* set_motors, and set_motor_speeds topics, and advertises the
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* query_motors service.
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* This is the main function for the buttons node. It is run
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* when the node starts and initializes the buttons. It then
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* subscribes to the event_button topics, and advertises the
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* query_buttons service.
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* |
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* @param argc The number of command line arguments (should be 1) |
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* @param argv The array of command line arguments |
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**/ |
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int main(int argc, char **argv) |
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{ |
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/* Initialize in ROS the motors driver node */
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ros::init(argc, argv, "motors_driver");
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/* Initialize in ROS the buttons driver node */
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ros::init(argc, argv, "buttons_driver");
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/* Advertise that this serves the query_motors service */
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/* Advertise that this serves the query_buttons service */
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ros::NodeHandle n; |
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ros::ServiceServer service = n.advertiseService("query_motors",
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motors_query);
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ros::ServiceServer service = n.advertiseService("query_buttons",
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buttons_query);
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/* Subscribe to the set_motors topic */
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ros::Subscriber sub0 = n.subscribe("set_motors", 4, motors_set);
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/* Subscribe to the button_event topic */
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ros::Subscriber sub0 = n.subscribe("button_event", 4, event_button);
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/* Initialize hardware for motors */
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/* Initialize hardware for buttons */
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// Hardware init functions here |
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ROS_INFO("Ready to set motors.");
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ROS_INFO("Ready to query buttons.");
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ros::spin(); |
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return 0; |
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