MATLAB Answers

Unable to go to external mode

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Syed Hamza Ali
Syed Hamza Ali on 31 Jul 2017
Commented: Victor Maciel on 10 Jul 2020 at 20:02
I am running simple LED blinking using Simulink and Arduino and i am running into this error
Build process completed successfully
Error occurred while executing External Mode MEX-file 'ext_comm':
Failed to connect to the target. A time-out occurred while waiting for the connection response from the target. Possible reasons for the time-out:
a) The target is not switched on.
b) The target is not connected to your host machine.
c) The application for the model is not running on the target. You might have clicked the Stop button. If the Run button is not dimmed, click it. Otherwise, click the Build button, which downloads and runs your application on the target.
Component:Simulink | Category:Block diagram error
Unable to connect to the 'Arduino Uno' target for 'syched'.
What to do.

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Rok Avsec
Rok Avsec on 20 Dec 2018
I had the same problem. Go and read this thread. I spent 2 days looking arround but this did the trick in 1 minute.
tuan le tho
tuan le tho on 28 May 2019
Thanks a lot for sharing
That trick works
Victor Maciel
Victor Maciel on 10 Jul 2020 at 20:02
Me too, Rok Avsec. The problem was the baud rate too high.

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Answers (5)

abdolreza azizi
abdolreza azizi on 15 Jun 2018
i have this problem for matlab2018 and latest simulink support package.how fix it?

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Madhu Govindarajan
Madhu Govindarajan on 15 Jun 2018
@abdolreza azizi - can you try adding a scope to the arduino_gettingstarted model and run it in external mode with your hardware and let us know what errors you are getting.
abdolreza azizi
abdolreza azizi on 21 Jun 2018
recently I installed Matlab 2018a with update2 and the latest Simulink support package for Arduino hardware. when I deploy the Simulink model to Arduino mega2560, it works well. but when I want to run in external mode, this error occurs. also : 1. I don't have any additional devices or shields. 2. about three months ago with Matlab 2017a and latest support package i able to run external model and also deploy the model to Arduino mega2560, due, and UNO. but last week I tried to run external model on Arduino, but it didn't work. (deploy works well ) then I change my Matlab to 2018a with update 2 and latest support package. the fault occurs again but i can deploy the Simulink model to Arduino and it works well. 3. it didn't work with basic example model.
abdolreza azizi
abdolreza azizi on 22 Jun 2018
AVR Memory Usage
----------------
Device: atmega2560
Program: 21432 bytes (8.2% Full)
(.text + .data + .bootloader)
Data: 1479 bytes (18.1% Full)
(.data + .bss + .noinit)
### Successful completion of build procedure for model: arduino_communication
Build process completed successfully
Error occurred while executing External Mode MEX-file 'ext_comm':
Failed to connect to the target. A time-out occurred while waiting for the connection response from the target. Possible reasons for the time-out:
a) The target is not switched on.
b) The target is not connected to your host machine.
c) The application for the model is not running on the target. You might have clicked the Stop button. If the Run button is not dimmed, click it. Otherwise, click the Build button, which downloads and runs your application on the target.

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Madhu Govindarajan
Madhu Govindarajan on 26 Oct 2017
Have you tried manually setting the COM port to the accurate port? Another common issue that causes this - A MATLAB arduino object already exists. This would not allow you to do External mode at the same time and you have to clear the object before you do external mode.
If error still persists, please reach out to Technical support of MathWorks.

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Christian Mack
Christian Mack on 27 Oct 2017
I could solve the prolbem in my case. I was using a "MEGA 2560" from China (a arduino replica) and it did not work. Now I tried a SainSmart MEGA 2560 (another replica) and this one is working fine (with the same settings and the same simulink model.)
Steffen Hartmann
Steffen Hartmann on 30 Oct 2018
Hello, I have the same problem when using simulation/external on my arduino uno system. When running on the hardware with "deploy to hardware" the code runs standalone like expected. That means communication in not a problem? It´s set to "Manual/com3". Could it be that simulation uses another com-port? Thank you in advance
Madhu Govindarajan
Madhu Govindarajan on 31 Oct 2018
Try a power cycle of switching off the Arduino power via USB and other external sources, then double pressing the RESET button to put it in bootloader mode. Then try external mode again.
Btw, with Arduino Uno there are some release restrictions. More info here - https://www.mathworks.com/hardware-support/arduino-simulink.html

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DEBASISH MISHRA
DEBASISH MISHRA on 27 Mar 2018
Hi, try to reduce the step size, may be 50e-6

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Walter Roberson
Walter Roberson on 28 Mar 2018
The timeout on connection to target has nothing to do with step size. It is a problem in reaching the device at all.

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Benjamin
Benjamin on 25 Jun 2018
I have the same problem. Any solutions?

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Gonzalo Cabanas
Gonzalo Cabanas on 13 Nov 2018
I have the same problem with an Chinese replica Arduino Mega 2560...Did anyone solve this problem?
Thank you guys!