ROS Serial library for Mbed platforms for ROS Indigo Igloo. Check http://wiki.ros.org/rosserial_mbed/ for more information
Dependents: rosserial_mbed_hello_world_publisher rtos_base_control rosserial_mbed_F64MA ROS-RTOS ... more
ROSSerial_mbed for Indigo 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
rosserial_mbed Hello World
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(); } }
Diff: rosserial_msgs/TopicInfo.h
- Revision:
- 0:fd24f7ca9688
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/rosserial_msgs/TopicInfo.h Thu Mar 31 14:22:59 2016 +0000 @@ -0,0 +1,125 @@ +#ifndef _ROS_rosserial_msgs_TopicInfo_h +#define _ROS_rosserial_msgs_TopicInfo_h + +#include <stdint.h> +#include <string.h> +#include <stdlib.h> +#include "ros/msg.h" + +namespace rosserial_msgs +{ + + class TopicInfo : public ros::Msg + { + public: + uint16_t topic_id; + const char* topic_name; + const char* message_type; + const char* md5sum; + int32_t buffer_size; + enum { ID_PUBLISHER = 0 }; + enum { ID_SUBSCRIBER = 1 }; + enum { ID_SERVICE_SERVER = 2 }; + enum { ID_SERVICE_CLIENT = 4 }; + enum { ID_PARAMETER_REQUEST = 6 }; + enum { ID_LOG = 7 }; + enum { ID_TIME = 10 }; + enum { ID_TX_STOP = 11 }; + + TopicInfo(): + topic_id(0), + topic_name(""), + message_type(""), + md5sum(""), + buffer_size(0) + { + } + + virtual int serialize(unsigned char *outbuffer) const + { + int offset = 0; + *(outbuffer + offset + 0) = (this->topic_id >> (8 * 0)) & 0xFF; + *(outbuffer + offset + 1) = (this->topic_id >> (8 * 1)) & 0xFF; + offset += sizeof(this->topic_id); + uint32_t length_topic_name = strlen(this->topic_name); + memcpy(outbuffer + offset, &length_topic_name, sizeof(uint32_t)); + offset += 4; + memcpy(outbuffer + offset, this->topic_name, length_topic_name); + offset += length_topic_name; + uint32_t length_message_type = strlen(this->message_type); + memcpy(outbuffer + offset, &length_message_type, sizeof(uint32_t)); + offset += 4; + memcpy(outbuffer + offset, this->message_type, length_message_type); + offset += length_message_type; + uint32_t length_md5sum = strlen(this->md5sum); + memcpy(outbuffer + offset, &length_md5sum, sizeof(uint32_t)); + offset += 4; + memcpy(outbuffer + offset, this->md5sum, length_md5sum); + offset += length_md5sum; + union { + int32_t real; + uint32_t base; + } u_buffer_size; + u_buffer_size.real = this->buffer_size; + *(outbuffer + offset + 0) = (u_buffer_size.base >> (8 * 0)) & 0xFF; + *(outbuffer + offset + 1) = (u_buffer_size.base >> (8 * 1)) & 0xFF; + *(outbuffer + offset + 2) = (u_buffer_size.base >> (8 * 2)) & 0xFF; + *(outbuffer + offset + 3) = (u_buffer_size.base >> (8 * 3)) & 0xFF; + offset += sizeof(this->buffer_size); + return offset; + } + + virtual int deserialize(unsigned char *inbuffer) + { + int offset = 0; + this->topic_id = ((uint16_t) (*(inbuffer + offset))); + this->topic_id |= ((uint16_t) (*(inbuffer + offset + 1))) << (8 * 1); + offset += sizeof(this->topic_id); + uint32_t length_topic_name; + memcpy(&length_topic_name, (inbuffer + offset), sizeof(uint32_t)); + offset += 4; + for(unsigned int k= offset; k< offset+length_topic_name; ++k){ + inbuffer[k-1]=inbuffer[k]; + } + inbuffer[offset+length_topic_name-1]=0; + this->topic_name = (char *)(inbuffer + offset-1); + offset += length_topic_name; + uint32_t length_message_type; + memcpy(&length_message_type, (inbuffer + offset), sizeof(uint32_t)); + offset += 4; + for(unsigned int k= offset; k< offset+length_message_type; ++k){ + inbuffer[k-1]=inbuffer[k]; + } + inbuffer[offset+length_message_type-1]=0; + this->message_type = (char *)(inbuffer + offset-1); + offset += length_message_type; + uint32_t length_md5sum; + memcpy(&length_md5sum, (inbuffer + offset), sizeof(uint32_t)); + offset += 4; + for(unsigned int k= offset; k< offset+length_md5sum; ++k){ + inbuffer[k-1]=inbuffer[k]; + } + inbuffer[offset+length_md5sum-1]=0; + this->md5sum = (char *)(inbuffer + offset-1); + offset += length_md5sum; + union { + int32_t real; + uint32_t base; + } u_buffer_size; + u_buffer_size.base = 0; + u_buffer_size.base |= ((uint32_t) (*(inbuffer + offset + 0))) << (8 * 0); + u_buffer_size.base |= ((uint32_t) (*(inbuffer + offset + 1))) << (8 * 1); + u_buffer_size.base |= ((uint32_t) (*(inbuffer + offset + 2))) << (8 * 2); + u_buffer_size.base |= ((uint32_t) (*(inbuffer + offset + 3))) << (8 * 3); + this->buffer_size = u_buffer_size.real; + offset += sizeof(this->buffer_size); + return offset; + } + + const char * getType(){ return "rosserial_msgs/TopicInfo"; }; + const char * getMD5(){ return "0ad51f88fc44892f8c10684077646005"; }; + + }; + +} +#endif \ No newline at end of file