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rosserial with Teensy 3.1 comm port

asked 2015-09-21 17:57:51 -0500

bsculley gravatar image

updated 2015-09-22 17:00:16 -0500

The current rosserial package (Jade) includes an Arduino library (ros_lib) that has been updated to recognize Teensy 3.1. It appears that when Teensy 3.1 is recognized, the serial port is automatically set to USB. I don't want to use USB, I want to use a UART to communicate with the ROS master (Beaglebone Black).

Am I missing something? Is there a configuration parameter or function call that will let me set the desired serial port on the Teensy? Or, failing that, some safe way to hack it?

If anyone has been successful (or not) setting up rosserial communication between Beaglebone Black (Ubuntu 14.04) and Teensy 3.1 I would like any information you can provide.

Below is some code from ArduinoHardware.h. If I don't want USB communications, which of the alternatives will work best for Teensy 3.1?

#if ARDUINO>=100
  #include <Arduino.h>  // Arduino 1.0
#else
  #include <WProgram.h>  // Arduino 0022
#endif

#if defined(__MK20DX128__) || defined(__MK20DX256__)
  #include <usb_serial.h>  // Teensy 3.0 and 3.1
  #define SERIAL_CLASS usb_serial_class
#elif defined(_SAM3XA_)
  #include <UARTClass.h>  // Arduino Due
  #define SERIAL_CLASS UARTClass
#elif defined(USE_USBCON)
  // Arduino Leonardo USB Serial Port
  #define SERIAL_CLASS Serial_
#else 
  #include <HardwareSerial.h>  // Arduino AVR
  #define SERIAL_CLASS HardwareSerial
#endif
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Comments

Did you see this answer? I've got this to work for changing the serial port of the Mega, haven't tried with the Teensy yet.

Gary Servin gravatar image Gary Servin  ( 2015-09-22 22:09:57 -0500 )edit

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answered 2015-09-23 00:33:59 -0500

I've created a PR to rosserial to add HW Serial ports support for Teensy.

For the moment, you need to manually add the changes:

1- Modify your ArduinoHardware.h to:

#if defined(__MK20DX128__) || defined(__MK20DX256__)
  #if defined(USE_TEENSY_HW_SERIAL)
    #define SERIAL_CLASS HardwareSerial // Teensy HW Serial
  #else
    #include <usb_serial.h>  // Teensy 3.0 and 3.1
    #define SERIAL_CLASS usb_serial_class
  #endif
#elif defined(_SAM3XA_)

and

 ArduinoHardware()
    {
#if defined(USBCON) and !(defined(USE_USBCON))
      /* Leonardo support */
      iostream = &Serial1;
#elif defined(USE_TEENSY_HW_SERIAL)
      iostream = &Serial1;
#else
      iostream = &Serial;
#endif

2- On your arduino sketch use the following at the beginning:

#define USE_TEENSY_HW_SERIAL

#include <ros.h>

class NewHardware : public ArduinoHardware
{
  public:
  NewHardware():ArduinoHardware(&Serial1, 57600){}; // Specify which port you want to use
};

ros::NodeHandle_<NewHardware> nh;

Hope this helps you!

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Just the ticket. Thanks!

bsculley gravatar image bsculley  ( 2015-09-23 11:33:41 -0500 )edit

Adding the #define USE_TEENSY_HW_SERIAL was what solved my problem with the Teensy 3.6, Arduino 1.8.5 and ROS Kinetic.

flurin4 gravatar image flurin4  ( 2017-11-07 07:57:59 -0500 )edit

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Asked: 2015-09-21 17:57:51 -0500

Seen: 2,277 times

Last updated: Sep 23 '15