ROS Serial library for Mbed platforms for ROS Jade Turtle. Check http://wiki.ros.org/rosserial_mbed/ for more information.
Dependents: rosserial_mbed_hello_world_publisher_jade
ROSSerial_mbed for Jade Distribution
The Robot Operating System (ROS) is a flexible framework for writing robot software. It is a collection of tools, libraries, and conventions that aim to simplify the task of creating complex and robust robot behavior across a wide variety of robotic platforms.
The rosserial_mbed package allows to write ROS nodes on any mbed enabled devices and have them connected to a running ROS system on your computer using the serial port.
Hello World (example publisher)
Import programrosserial_mbed_hello_world_publisher_jade
rosserial_mbed Hello World example for jade distribution
Running the Code
Now, launch the roscore in a new terminal window:
Quote:
$ roscore
Next, run the rosserial client application that forwards your MBED messages to the rest of ROS. Make sure to use the correct serial port:
Quote:
$ rosrun rosserial_python serial_node.py /dev/ttyACM0
Finally, watch the greetings come in from your MBED by launching a new terminal window and entering :
Quote:
$ rostopic echo chatter
See Also
More examples
Blink
/* * rosserial Subscriber Example * Blinks an LED on callback */ #include "mbed.h" #include <ros.h> #include <std_msgs/Empty.h> ros::NodeHandle nh; DigitalOut myled(LED1); void messageCb(const std_msgs::Empty& toggle_msg){ myled = !myled; // blink the led } ros::Subscriber<std_msgs::Empty> sub("toggle_led", &messageCb); int main() { nh.initNode(); nh.subscribe(sub); while (1) { nh.spinOnce(); wait_ms(1); } }
Push
/* * Button Example for Rosserial */ #include "mbed.h" #include <ros.h> #include <std_msgs/Bool.h> PinName button = p20; ros::NodeHandle nh; std_msgs::Bool pushed_msg; ros::Publisher pub_button("pushed", &pushed_msg); DigitalIn button_pin(button); DigitalOut led_pin(LED1); bool last_reading; long last_debounce_time=0; long debounce_delay=50; bool published = true; Timer t; int main() { t.start(); nh.initNode(); nh.advertise(pub_button); //Enable the pullup resistor on the button button_pin.mode(PullUp); //The button is a normally button last_reading = ! button_pin; while (1) { bool reading = ! button_pin; if (last_reading!= reading) { last_debounce_time = t.read_ms(); published = false; } //if the button value has not changed for the debounce delay, we know its stable if ( !published && (t.read_ms() - last_debounce_time) > debounce_delay) { led_pin = reading; pushed_msg.data = reading; pub_button.publish(&pushed_msg); published = true; } last_reading = reading; nh.spinOnce(); } }
rospy_tutorials/Floats.h@0:a906bb7c7831, 2016-03-31 (annotated)
- Committer:
- garyservin
- Date:
- Thu Mar 31 23:23:15 2016 +0000
- Revision:
- 0:a906bb7c7831
ROS Serial library for Mbed platforms for ROS Jade Turtle. Check http://wiki.ros.org/rosserial_mbed/ for more information.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
garyservin | 0:a906bb7c7831 | 1 | #ifndef _ROS_rospy_tutorials_Floats_h |
garyservin | 0:a906bb7c7831 | 2 | #define _ROS_rospy_tutorials_Floats_h |
garyservin | 0:a906bb7c7831 | 3 | |
garyservin | 0:a906bb7c7831 | 4 | #include <stdint.h> |
garyservin | 0:a906bb7c7831 | 5 | #include <string.h> |
garyservin | 0:a906bb7c7831 | 6 | #include <stdlib.h> |
garyservin | 0:a906bb7c7831 | 7 | #include "ros/msg.h" |
garyservin | 0:a906bb7c7831 | 8 | |
garyservin | 0:a906bb7c7831 | 9 | namespace rospy_tutorials |
garyservin | 0:a906bb7c7831 | 10 | { |
garyservin | 0:a906bb7c7831 | 11 | |
garyservin | 0:a906bb7c7831 | 12 | class Floats : public ros::Msg |
garyservin | 0:a906bb7c7831 | 13 | { |
garyservin | 0:a906bb7c7831 | 14 | public: |
garyservin | 0:a906bb7c7831 | 15 | uint8_t data_length; |
garyservin | 0:a906bb7c7831 | 16 | float st_data; |
garyservin | 0:a906bb7c7831 | 17 | float * data; |
garyservin | 0:a906bb7c7831 | 18 | |
garyservin | 0:a906bb7c7831 | 19 | Floats(): |
garyservin | 0:a906bb7c7831 | 20 | data_length(0), data(NULL) |
garyservin | 0:a906bb7c7831 | 21 | { |
garyservin | 0:a906bb7c7831 | 22 | } |
garyservin | 0:a906bb7c7831 | 23 | |
garyservin | 0:a906bb7c7831 | 24 | virtual int serialize(unsigned char *outbuffer) const |
garyservin | 0:a906bb7c7831 | 25 | { |
garyservin | 0:a906bb7c7831 | 26 | int offset = 0; |
garyservin | 0:a906bb7c7831 | 27 | *(outbuffer + offset++) = data_length; |
garyservin | 0:a906bb7c7831 | 28 | *(outbuffer + offset++) = 0; |
garyservin | 0:a906bb7c7831 | 29 | *(outbuffer + offset++) = 0; |
garyservin | 0:a906bb7c7831 | 30 | *(outbuffer + offset++) = 0; |
garyservin | 0:a906bb7c7831 | 31 | for( uint8_t i = 0; i < data_length; i++){ |
garyservin | 0:a906bb7c7831 | 32 | union { |
garyservin | 0:a906bb7c7831 | 33 | float real; |
garyservin | 0:a906bb7c7831 | 34 | uint32_t base; |
garyservin | 0:a906bb7c7831 | 35 | } u_datai; |
garyservin | 0:a906bb7c7831 | 36 | u_datai.real = this->data[i]; |
garyservin | 0:a906bb7c7831 | 37 | *(outbuffer + offset + 0) = (u_datai.base >> (8 * 0)) & 0xFF; |
garyservin | 0:a906bb7c7831 | 38 | *(outbuffer + offset + 1) = (u_datai.base >> (8 * 1)) & 0xFF; |
garyservin | 0:a906bb7c7831 | 39 | *(outbuffer + offset + 2) = (u_datai.base >> (8 * 2)) & 0xFF; |
garyservin | 0:a906bb7c7831 | 40 | *(outbuffer + offset + 3) = (u_datai.base >> (8 * 3)) & 0xFF; |
garyservin | 0:a906bb7c7831 | 41 | offset += sizeof(this->data[i]); |
garyservin | 0:a906bb7c7831 | 42 | } |
garyservin | 0:a906bb7c7831 | 43 | return offset; |
garyservin | 0:a906bb7c7831 | 44 | } |
garyservin | 0:a906bb7c7831 | 45 | |
garyservin | 0:a906bb7c7831 | 46 | virtual int deserialize(unsigned char *inbuffer) |
garyservin | 0:a906bb7c7831 | 47 | { |
garyservin | 0:a906bb7c7831 | 48 | int offset = 0; |
garyservin | 0:a906bb7c7831 | 49 | uint8_t data_lengthT = *(inbuffer + offset++); |
garyservin | 0:a906bb7c7831 | 50 | if(data_lengthT > data_length) |
garyservin | 0:a906bb7c7831 | 51 | this->data = (float*)realloc(this->data, data_lengthT * sizeof(float)); |
garyservin | 0:a906bb7c7831 | 52 | offset += 3; |
garyservin | 0:a906bb7c7831 | 53 | data_length = data_lengthT; |
garyservin | 0:a906bb7c7831 | 54 | for( uint8_t i = 0; i < data_length; i++){ |
garyservin | 0:a906bb7c7831 | 55 | union { |
garyservin | 0:a906bb7c7831 | 56 | float real; |
garyservin | 0:a906bb7c7831 | 57 | uint32_t base; |
garyservin | 0:a906bb7c7831 | 58 | } u_st_data; |
garyservin | 0:a906bb7c7831 | 59 | u_st_data.base = 0; |
garyservin | 0:a906bb7c7831 | 60 | u_st_data.base |= ((uint32_t) (*(inbuffer + offset + 0))) << (8 * 0); |
garyservin | 0:a906bb7c7831 | 61 | u_st_data.base |= ((uint32_t) (*(inbuffer + offset + 1))) << (8 * 1); |
garyservin | 0:a906bb7c7831 | 62 | u_st_data.base |= ((uint32_t) (*(inbuffer + offset + 2))) << (8 * 2); |
garyservin | 0:a906bb7c7831 | 63 | u_st_data.base |= ((uint32_t) (*(inbuffer + offset + 3))) << (8 * 3); |
garyservin | 0:a906bb7c7831 | 64 | this->st_data = u_st_data.real; |
garyservin | 0:a906bb7c7831 | 65 | offset += sizeof(this->st_data); |
garyservin | 0:a906bb7c7831 | 66 | memcpy( &(this->data[i]), &(this->st_data), sizeof(float)); |
garyservin | 0:a906bb7c7831 | 67 | } |
garyservin | 0:a906bb7c7831 | 68 | return offset; |
garyservin | 0:a906bb7c7831 | 69 | } |
garyservin | 0:a906bb7c7831 | 70 | |
garyservin | 0:a906bb7c7831 | 71 | const char * getType(){ return "rospy_tutorials/Floats"; }; |
garyservin | 0:a906bb7c7831 | 72 | const char * getMD5(){ return "420cd38b6b071cd49f2970c3e2cee511"; }; |
garyservin | 0:a906bb7c7831 | 73 | |
garyservin | 0:a906bb7c7831 | 74 | }; |
garyservin | 0:a906bb7c7831 | 75 | |
garyservin | 0:a906bb7c7831 | 76 | } |
garyservin | 0:a906bb7c7831 | 77 | #endif |