ROS Serial library for Mbed platforms for ROS Melodic Morenia. Check http://wiki.ros.org/rosserial_mbed/ for more information.

Dependencies:   BufferedSerial

Dependents:   rosserial_mbed_hello_world_publisher_melodic Motortest Nucleo_vr_servo_project NucleoFM ... more

ROSSerial_mbed for Melodic 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_melodic

rosserial_mbed Hello World example for Melodic Morenia 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();
    }
}
Committer:
Gary Servin
Date:
Fri Nov 08 14:38:09 2019 -0300
Revision:
0:04ac6be8229a
Initial commit, generated based on a clean melodic-desktop-full

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Gary Servin 0:04ac6be8229a 1 #ifndef _ROS_sensor_msgs_FluidPressure_h
Gary Servin 0:04ac6be8229a 2 #define _ROS_sensor_msgs_FluidPressure_h
Gary Servin 0:04ac6be8229a 3
Gary Servin 0:04ac6be8229a 4 #include <stdint.h>
Gary Servin 0:04ac6be8229a 5 #include <string.h>
Gary Servin 0:04ac6be8229a 6 #include <stdlib.h>
Gary Servin 0:04ac6be8229a 7 #include "ros/msg.h"
Gary Servin 0:04ac6be8229a 8 #include "std_msgs/Header.h"
Gary Servin 0:04ac6be8229a 9
Gary Servin 0:04ac6be8229a 10 namespace sensor_msgs
Gary Servin 0:04ac6be8229a 11 {
Gary Servin 0:04ac6be8229a 12
Gary Servin 0:04ac6be8229a 13 class FluidPressure : public ros::Msg
Gary Servin 0:04ac6be8229a 14 {
Gary Servin 0:04ac6be8229a 15 public:
Gary Servin 0:04ac6be8229a 16 typedef std_msgs::Header _header_type;
Gary Servin 0:04ac6be8229a 17 _header_type header;
Gary Servin 0:04ac6be8229a 18 typedef double _fluid_pressure_type;
Gary Servin 0:04ac6be8229a 19 _fluid_pressure_type fluid_pressure;
Gary Servin 0:04ac6be8229a 20 typedef double _variance_type;
Gary Servin 0:04ac6be8229a 21 _variance_type variance;
Gary Servin 0:04ac6be8229a 22
Gary Servin 0:04ac6be8229a 23 FluidPressure():
Gary Servin 0:04ac6be8229a 24 header(),
Gary Servin 0:04ac6be8229a 25 fluid_pressure(0),
Gary Servin 0:04ac6be8229a 26 variance(0)
Gary Servin 0:04ac6be8229a 27 {
Gary Servin 0:04ac6be8229a 28 }
Gary Servin 0:04ac6be8229a 29
Gary Servin 0:04ac6be8229a 30 virtual int serialize(unsigned char *outbuffer) const
Gary Servin 0:04ac6be8229a 31 {
Gary Servin 0:04ac6be8229a 32 int offset = 0;
Gary Servin 0:04ac6be8229a 33 offset += this->header.serialize(outbuffer + offset);
Gary Servin 0:04ac6be8229a 34 union {
Gary Servin 0:04ac6be8229a 35 double real;
Gary Servin 0:04ac6be8229a 36 uint64_t base;
Gary Servin 0:04ac6be8229a 37 } u_fluid_pressure;
Gary Servin 0:04ac6be8229a 38 u_fluid_pressure.real = this->fluid_pressure;
Gary Servin 0:04ac6be8229a 39 *(outbuffer + offset + 0) = (u_fluid_pressure.base >> (8 * 0)) & 0xFF;
Gary Servin 0:04ac6be8229a 40 *(outbuffer + offset + 1) = (u_fluid_pressure.base >> (8 * 1)) & 0xFF;
Gary Servin 0:04ac6be8229a 41 *(outbuffer + offset + 2) = (u_fluid_pressure.base >> (8 * 2)) & 0xFF;
Gary Servin 0:04ac6be8229a 42 *(outbuffer + offset + 3) = (u_fluid_pressure.base >> (8 * 3)) & 0xFF;
Gary Servin 0:04ac6be8229a 43 *(outbuffer + offset + 4) = (u_fluid_pressure.base >> (8 * 4)) & 0xFF;
Gary Servin 0:04ac6be8229a 44 *(outbuffer + offset + 5) = (u_fluid_pressure.base >> (8 * 5)) & 0xFF;
Gary Servin 0:04ac6be8229a 45 *(outbuffer + offset + 6) = (u_fluid_pressure.base >> (8 * 6)) & 0xFF;
Gary Servin 0:04ac6be8229a 46 *(outbuffer + offset + 7) = (u_fluid_pressure.base >> (8 * 7)) & 0xFF;
Gary Servin 0:04ac6be8229a 47 offset += sizeof(this->fluid_pressure);
Gary Servin 0:04ac6be8229a 48 union {
Gary Servin 0:04ac6be8229a 49 double real;
Gary Servin 0:04ac6be8229a 50 uint64_t base;
Gary Servin 0:04ac6be8229a 51 } u_variance;
Gary Servin 0:04ac6be8229a 52 u_variance.real = this->variance;
Gary Servin 0:04ac6be8229a 53 *(outbuffer + offset + 0) = (u_variance.base >> (8 * 0)) & 0xFF;
Gary Servin 0:04ac6be8229a 54 *(outbuffer + offset + 1) = (u_variance.base >> (8 * 1)) & 0xFF;
Gary Servin 0:04ac6be8229a 55 *(outbuffer + offset + 2) = (u_variance.base >> (8 * 2)) & 0xFF;
Gary Servin 0:04ac6be8229a 56 *(outbuffer + offset + 3) = (u_variance.base >> (8 * 3)) & 0xFF;
Gary Servin 0:04ac6be8229a 57 *(outbuffer + offset + 4) = (u_variance.base >> (8 * 4)) & 0xFF;
Gary Servin 0:04ac6be8229a 58 *(outbuffer + offset + 5) = (u_variance.base >> (8 * 5)) & 0xFF;
Gary Servin 0:04ac6be8229a 59 *(outbuffer + offset + 6) = (u_variance.base >> (8 * 6)) & 0xFF;
Gary Servin 0:04ac6be8229a 60 *(outbuffer + offset + 7) = (u_variance.base >> (8 * 7)) & 0xFF;
Gary Servin 0:04ac6be8229a 61 offset += sizeof(this->variance);
Gary Servin 0:04ac6be8229a 62 return offset;
Gary Servin 0:04ac6be8229a 63 }
Gary Servin 0:04ac6be8229a 64
Gary Servin 0:04ac6be8229a 65 virtual int deserialize(unsigned char *inbuffer)
Gary Servin 0:04ac6be8229a 66 {
Gary Servin 0:04ac6be8229a 67 int offset = 0;
Gary Servin 0:04ac6be8229a 68 offset += this->header.deserialize(inbuffer + offset);
Gary Servin 0:04ac6be8229a 69 union {
Gary Servin 0:04ac6be8229a 70 double real;
Gary Servin 0:04ac6be8229a 71 uint64_t base;
Gary Servin 0:04ac6be8229a 72 } u_fluid_pressure;
Gary Servin 0:04ac6be8229a 73 u_fluid_pressure.base = 0;
Gary Servin 0:04ac6be8229a 74 u_fluid_pressure.base |= ((uint64_t) (*(inbuffer + offset + 0))) << (8 * 0);
Gary Servin 0:04ac6be8229a 75 u_fluid_pressure.base |= ((uint64_t) (*(inbuffer + offset + 1))) << (8 * 1);
Gary Servin 0:04ac6be8229a 76 u_fluid_pressure.base |= ((uint64_t) (*(inbuffer + offset + 2))) << (8 * 2);
Gary Servin 0:04ac6be8229a 77 u_fluid_pressure.base |= ((uint64_t) (*(inbuffer + offset + 3))) << (8 * 3);
Gary Servin 0:04ac6be8229a 78 u_fluid_pressure.base |= ((uint64_t) (*(inbuffer + offset + 4))) << (8 * 4);
Gary Servin 0:04ac6be8229a 79 u_fluid_pressure.base |= ((uint64_t) (*(inbuffer + offset + 5))) << (8 * 5);
Gary Servin 0:04ac6be8229a 80 u_fluid_pressure.base |= ((uint64_t) (*(inbuffer + offset + 6))) << (8 * 6);
Gary Servin 0:04ac6be8229a 81 u_fluid_pressure.base |= ((uint64_t) (*(inbuffer + offset + 7))) << (8 * 7);
Gary Servin 0:04ac6be8229a 82 this->fluid_pressure = u_fluid_pressure.real;
Gary Servin 0:04ac6be8229a 83 offset += sizeof(this->fluid_pressure);
Gary Servin 0:04ac6be8229a 84 union {
Gary Servin 0:04ac6be8229a 85 double real;
Gary Servin 0:04ac6be8229a 86 uint64_t base;
Gary Servin 0:04ac6be8229a 87 } u_variance;
Gary Servin 0:04ac6be8229a 88 u_variance.base = 0;
Gary Servin 0:04ac6be8229a 89 u_variance.base |= ((uint64_t) (*(inbuffer + offset + 0))) << (8 * 0);
Gary Servin 0:04ac6be8229a 90 u_variance.base |= ((uint64_t) (*(inbuffer + offset + 1))) << (8 * 1);
Gary Servin 0:04ac6be8229a 91 u_variance.base |= ((uint64_t) (*(inbuffer + offset + 2))) << (8 * 2);
Gary Servin 0:04ac6be8229a 92 u_variance.base |= ((uint64_t) (*(inbuffer + offset + 3))) << (8 * 3);
Gary Servin 0:04ac6be8229a 93 u_variance.base |= ((uint64_t) (*(inbuffer + offset + 4))) << (8 * 4);
Gary Servin 0:04ac6be8229a 94 u_variance.base |= ((uint64_t) (*(inbuffer + offset + 5))) << (8 * 5);
Gary Servin 0:04ac6be8229a 95 u_variance.base |= ((uint64_t) (*(inbuffer + offset + 6))) << (8 * 6);
Gary Servin 0:04ac6be8229a 96 u_variance.base |= ((uint64_t) (*(inbuffer + offset + 7))) << (8 * 7);
Gary Servin 0:04ac6be8229a 97 this->variance = u_variance.real;
Gary Servin 0:04ac6be8229a 98 offset += sizeof(this->variance);
Gary Servin 0:04ac6be8229a 99 return offset;
Gary Servin 0:04ac6be8229a 100 }
Gary Servin 0:04ac6be8229a 101
Gary Servin 0:04ac6be8229a 102 const char * getType(){ return "sensor_msgs/FluidPressure"; };
Gary Servin 0:04ac6be8229a 103 const char * getMD5(){ return "804dc5cea1c5306d6a2eb80b9833befe"; };
Gary Servin 0:04ac6be8229a 104
Gary Servin 0:04ac6be8229a 105 };
Gary Servin 0:04ac6be8229a 106
Gary Servin 0:04ac6be8229a 107 }
Gary Servin 0:04ac6be8229a 108 #endif