root / scout / motors / src / motors.cpp @ cc9e9213
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1 | c406f16b | Ben | /**
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2 | 0121ead7 | bwasserm | * Copyright (c) 2011 Colony Project
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3 | c406f16b | Ben | *
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4 | * Permission is hereby granted, free of charge, to any person
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5 | * obtaining a copy of this software and associated documentation
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6 | * files (the "Software"), to deal in the Software without
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7 | * restriction, including without limitation the rights to use,
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8 | * copy, modify, merge, publish, distribute, sublicense, and/or sell
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9 | * copies of the Software, and to permit persons to whom the
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10 | * Software is furnished to do so, subject to the following
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11 | * conditions:
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12 | *
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13 | * The above copyright notice and this permission notice shall be
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14 | * included in all copies or substantial portions of the Software.
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15 | *
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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17 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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18 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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19 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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20 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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21 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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22 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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23 | * OTHER DEALINGS IN THE SOFTWARE.
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24 | c492be62 | Alex Zirbel | */
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25 | c406f16b | Ben | |
26 | /**
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27 | * @file motors.cpp
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28 | 18e2028b | Alex | * @brief Contains code to control the motors.
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29 | c406f16b | Ben | *
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30 | * Implementation of functions for motor use.
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31 | *
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32 | * @author Colony Project, CMU Robotics Club
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33 | 3ec16d35 | Ben Wasserman | * @author Ben Wasserman
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34 | 9b11c5b3 | Alex Zirbel | */
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35 | c406f16b | Ben | |
36 | a8480867 | Alex Zirbel | #include <ros/ros.h> |
37 | c406f16b | Ben | #include <cstdlib> |
38 | cc9e9213 | Tom Mullins | #include <fstream> |
39 | a8480867 | Alex Zirbel | #include "motors.h" |
40 | c406f16b | Ben | |
41 | cc9e9213 | Tom Mullins | using namespace std; |
42 | |||
43 | c406f16b | Ben | /**
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44 | * @defgroup motors Motors
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45 | * @brief Functions for using the motors
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46 | *
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47 | 18e2028b | Alex | * @{
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48 | 9b11c5b3 | Alex Zirbel | */
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49 | c406f16b | Ben | |
50 | c9f87aaf | bwasserm | /* Motor state variables
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51 | * Speeds expressed as absolute speed out of max speed (0 - +-MAXSPEED)
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52 | * Absolute speed is the speed written to the hardware to move the motors
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53 | */
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54 | 2814387f | Alex Zirbel | static int motor_fl_speed; /**< The current speed of the front left motor. */ |
55 | static int motor_fr_speed; /**< The current speed of the front right motor. */ |
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56 | static int motor_bl_speed; /**< The current speed of the back left motor. */ |
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57 | static int motor_br_speed; /**< The current speed of the back right motor. */ |
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58 | 0121ead7 | bwasserm | |
59 | cc9e9213 | Tom Mullins | static fstream motor_fl_file; /**< The device file for the front left motor. */ |
60 | static fstream motor_fr_file; /**< The device file for the front right motor. */ |
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61 | static fstream motor_bl_file; /**< The device file for the back left motor. */ |
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62 | static fstream motor_br_file; /**< The device file for the back right motor. */ |
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63 | |||
64 | 18e2028b | Alex | /**
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65 | * @brief Sets motor speed
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66 | c406f16b | Ben | *
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67 | * Sets the motor speeds based on subscription to the set_motors topic.
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68 | *
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69 | 18e2028b | Alex | * @param msg The message from the set_motors topic, containing speeds and
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70 | c406f16b | Ben | * motor configuration settings.
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71 | */
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72 | 18e2028b | Alex | void motors_set(const motors::set_motors::ConstPtr& msg) |
73 | { |
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74 | 2814387f | Alex Zirbel | if(msg->fl_set)
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75 | c9f87aaf | bwasserm | { |
76 | a8480867 | Alex Zirbel | motor_fl_speed = msg->fl_speed; |
77 | cc9e9213 | Tom Mullins | motor_fl_file << motor_fl_speed; |
78 | c9f87aaf | bwasserm | } |
79 | 2814387f | Alex Zirbel | if(msg->fr_set)
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80 | c9f87aaf | bwasserm | { |
81 | a8480867 | Alex Zirbel | motor_fr_speed = msg->fr_speed; |
82 | cc9e9213 | Tom Mullins | motor_fr_file << motor_fr_speed; |
83 | c9f87aaf | bwasserm | } |
84 | 2814387f | Alex Zirbel | if(msg->bl_set)
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85 | c9f87aaf | bwasserm | { |
86 | a8480867 | Alex Zirbel | motor_bl_speed = msg->bl_speed; |
87 | cc9e9213 | Tom Mullins | motor_bl_file << motor_bl_speed; |
88 | c9f87aaf | bwasserm | } |
89 | 2814387f | Alex Zirbel | if(msg->br_set)
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90 | c9f87aaf | bwasserm | { |
91 | a8480867 | Alex Zirbel | motor_br_speed = msg->br_speed; |
92 | cc9e9213 | Tom Mullins | motor_br_file << motor_br_speed; |
93 | c9f87aaf | bwasserm | } |
94 | |||
95 | 2814387f | Alex Zirbel | ROS_DEBUG("Motor speeds set");
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96 | c406f16b | Ben | } |
97 | |||
98 | 18e2028b | Alex | /**
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99 | * @brief Outputs current motor speeds
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100 | c406f16b | Ben | *
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101 | * Serves the service query_motors by responding to service requests with the
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102 | * speeds of the motors.
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103 | c9f87aaf | bwasserm | * @param req The request. The only field is the units requested.
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104 | 18e2028b | Alex | * @param res The response. The fields will be filled with values.
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105 | c406f16b | Ben | */
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106 | bool motors_query(motors::query_motors::Request &req,
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107 | 18e2028b | Alex | motors::query_motors::Response &res) |
108 | { |
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109 | a8480867 | Alex Zirbel | /** @todo Are we checking hardware or just using the saved values?
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110 | cc9e9213 | Tom Mullins | * Saved values sound fine to me (Alex). Pleas confirm.
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111 | * I think saved values are ok; they're read in from hardware at the
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112 | * beginning (Tom). */
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113 | a8480867 | Alex Zirbel | res.fl_speed = motor_fl_speed; |
114 | res.fr_speed = motor_fr_speed; |
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115 | res.bl_speed = motor_bl_speed; |
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116 | res.br_speed = motor_br_speed; |
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117 | 18e2028b | Alex | |
118 | ROS_DEBUG("Motor speeds queried");
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119 | a8480867 | Alex Zirbel | |
120 | 18e2028b | Alex | return true; |
121 | } |
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122 | |||
123 | /**
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124 | * @brief Motors driver. This is a ROS node that controls motor speeds.
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125 | *
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126 | * This is the main function for the motors node. It is run when the node
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127 | * starts and initializes the motors. It then subscribes to the
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128 | * set_motors, and set_motor_speeds topics, and advertises the
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129 | * query_motors service.
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130 | *
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131 | * @param argc The number of command line arguments (should be 1)
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132 | * @param argv The array of command line arguments
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133 | 9b11c5b3 | Alex Zirbel | */
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134 | 18e2028b | Alex | int main(int argc, char **argv) |
135 | { |
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136 | /* Initialize in ROS the motors driver node */
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137 | ros::init(argc, argv, "motors_driver");
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138 | |||
139 | /* Advertise that this serves the query_motors service */
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140 | 2814387f | Alex Zirbel | ros::NodeHandle node; |
141 | ros::ServiceServer service = node.advertiseService("query_motors",
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142 | motors_query); |
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143 | 18e2028b | Alex | |
144 | /* Subscribe to the set_motors topic */
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145 | 2814387f | Alex Zirbel | ros::Subscriber sub0 = node.subscribe("set_motors", QUEUE_SIZE, motors_set);
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146 | 18e2028b | Alex | |
147 | cc9e9213 | Tom Mullins | /* Open device files for PWM values */
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148 | /** @todo These are probably not the correct order */
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149 | motor_fl_file.open("/dev/pwm8");
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150 | motor_fr_file.open("/dev/pwm9");
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151 | motor_bl_file.open("/dev/pwm10");
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152 | motor_br_file.open("/dev/pwm11");
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153 | |||
154 | /* Get initial values, for motor queries */
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155 | motor_fl_file >> motor_fl_speed; |
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156 | motor_fr_file >> motor_fr_speed; |
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157 | motor_bl_file >> motor_bl_speed; |
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158 | motor_br_file >> motor_br_speed; |
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159 | 18e2028b | Alex | |
160 | a8480867 | Alex Zirbel | ROS_INFO("Motors node ready.");
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161 | 18e2028b | Alex | ros::spin(); |
162 | c406f16b | Ben | |
163 | 18e2028b | Alex | return 0; |
164 | c406f16b | Ben | } |
165 | |||
166 | 9b11c5b3 | Alex Zirbel | /** @} */ |