Tone.cpp multiple definition error, R2018b. Arduino, Simulink.

I have a Simulink model which I want to deploy on my Arduino Uno. When I attempt to build it in R2018b, I encounter a build error. The error is quite lengthy but contains the following snippet towards the end:

"### Creating standalone executable "../PulseLED12.elf" ..." C:/ProgramData/MATLAB/SupportPackages/R2018b/3P.instrset/arduinoide.instrset/arduino-1.8.1/hardware/tools/avr/bin/avr-gcc -w -Os -Wl,--gc-sections,--relax -mmcu=atmega328p -o ../PulseLED12.elf MW_AnalogInput.o PulseLED12.o PulseLED12_data.o updown.o ext_work.o rtiostream_utils.o makeatune_wrapper.o wiring_pulse.S.o hooks.o WInterrupts.o wiring.o wiring_analog.o wiring_digital.o wiring_pulse.o wiring_shift.o abi.o CDC.o HardwareSerial.o HardwareSerial0.o HardwareSerial1.o HardwareSerial2.o HardwareSerial3.o PluggableUSB.o IPAddress.o new.o Print.o Stream.o Tone.o USBCore.o WMath.o WString.o MW_ArduinoHWInit.o io_wrappers.o arduinoAVRScheduler.o rtiostream_interface.o ext_svr_daemon.o rtiostream_serial_daemon.o daemon_checksum.o ert_main.o -lm Tone.o: In function `__vector_7': C:/ProgramData/MATLAB/SupportPackages/R2018b/3P.instrset/arduinoide.instrset/arduino-1.8.1/hardware/arduino/avr/cores/arduino/Tone.cpp:539: multiple definition of `__vector_7' makeatune_wrapper.o:C:/ProgramData/MATLAB/SupportPackages/R2018b/3P.instrset/arduinoide.instrset/arduino-1.8.1/hardware/arduino/avr/cores/arduino/Tone.cpp:539: first defined here c:/programdata/matlab/supportpackages/r2018b/3p.instrset/arduinoide.instrset/arduino-1.8.1/hardware/tools/avr/bin/../lib/gcc/avr/4.9.2/../../../../avr/bin/ld.exe: Disabling relaxation: it will not work with multiple definitions collect2.exe: error: ld returned 1 exit status gmake: *** [../PulseLED12.elf] Error 1

I attempted to follow the fix in this question, but like someone else, I then get an error telling me that I don't have matlab coder installed.

Please help!

Answer 1

[Pratik]

Hi Euan,

From what can be understood from the error message, some particular system object is using the "NewPing.cpp" file which includes the definition of a timer interrupt handler.

The Simulink Arduino Support package also includes a "Tone.cpp" in the build process, which also contains a definition of the same timer interrupt handler as "NewPing.cpp". This results in a conflict during the build process.

A solution to this issue can be to exclude "Tone.cpp" from the build process. This can be done by following the steps below:

1. Go to the following location in your MATLAB support package root folder

XXXXX\toolbox\target\supportpackages\arduinotarget/registry/attributes

where XXXXX is the root support package folder location and can be obtained by executing "matlabshared.supportpkg.getSupportPackageRoot" at the MATLAB command window.

Note: You might have multiple folders containing "R20XXb" in the "SupportPackages" folder. Simply use the one that contains the "toolbox" folder in it.

2. Make a copy of the file "Arduino Uno_attributes.xml" for backup, and then open it in a text editor.

3. Delete line 31 from "Arduino Uno_attributes.xml" which includes "Tone.cpp" for the build.

4. Execute the following commands at the MATLAB command window.

clear classes 
rehash toolboxcache 
sl_refresh_customizations

5. Now open your Simulink model. Go to "Configuration Parameters --> Hardware Implementation" and reselect the "Hardware board" to "Arduino Uno"

6. Try to build and deploy the model.

I hope this helps!