LAUNCHXL-F28379D: MATLAB Simulink external mode error

Pavares Kiatsuarpanon

Part Number: LAUNCHXL-F28379D
Other Parts Discussed in Thread: TMS320F28335

I've bought f28379d launchpad for few days. Everything works fine except external mode in MATLAB Simulink. It's say

Build process completed successfully
Verbose mode is enabled for External mode. You can disable Verbose in Model Configuration Parameters > Hardware Implementation > Target Hardware Resources > External mode.
Attempting to establish connection with hostname '127.0.0.1' through port 17725.
action: EXT_CONNECT
Component:Simulink | Category:Model
Error occurred while executing External Mode MEX-file 'ext_comm':
Failed to connect to the target. Possible reasons for the failure:
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.

Caused by:
An error occurred attempting to open an rtIOStream. More detail may be reported in the MATLAB command window
Component:Simulink | Category:Block diagramerror
Unable to connect to the 'TI Delfino F2837xD' target for 'blink'.

My code is already build and the LED is blinking. I'm using matlab 2016b with c2000 hardware support add on, CCS v6 , control suite 3.4.4, and window 8.1. This is the same problem as nam dinh in this thread comment section.

https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/543547#pi316717=3

I've googling this for few days and can't find any solution. Thank for all of your support.

Pavares

over 7 years ago

0 Gautam Iyer over 7 years ago

Guru 192875 points

Hi,

In my case the external mode seems to be working all well. Is the com port selected for external mode correct? Also, check for the SCI gpios connected to USB. You need to configure that too under SCI peripheral.

Regards,
Gautam

0 Pavares Kiatsuarpanon over 7 years ago in reply to Gautam Iyer

Prodigy 40 points

Hi Gautam,

Thank for fast reply. I've double check for the model configuration parameter.

- Do I need to use extra hardware ? The only thing connected to my board is the USB cable.

- Isn't this USB port same as SCI_A ?

Pavares Kiatsuarpanon

0 Brian McKay over 7 years ago in reply to Pavares Kiatsuarpanon

Mastermind 9005 points

Fastest way to get help would be to contact MathWorks Technical Support.

Before you build, make sure you have not connected to the board using CCS. In some cases, I have seen the USB port get locked (by CCS or by MATLAB) and this prevents future connections to the board.

-Brian

0 Pavares Kiatsuarpanon over 7 years ago

Prodigy 40 points

I've found something from this article.

lost-contact.mit.edu/.../creating-a-tcp-ip-transport-layer-for-external-communication.html

It says
"On the client (Simulink engine) side, communications are handled by ext_comm (for TCP/IP) and ext_serial_win32_comm (for serial) MEX-files."

Although I've configured my model in Hardware Implementation > Hardware board setting > Target hardware resource > External mode to serial, I guess that it's trying to connect through TCP instead of serial(I see IP and port number in the error message).

This guy is facing the similar problem.

www.mathworks.com/.../245401-ti-f28069m-launchpad-external-mode-error-occurred-while-executing-external-mode-mex-file-ext_serial

I'll try contact MATLAB for support. Hope anyone solve this problem.

Pavares Kiatsuarpanon

0 Gautam Iyer over 7 years ago in reply to Pavares Kiatsuarpanon

Guru 192875 points

Pavares Kiatsuarpanon said:
- Do I need to use extra hardware ? The only thing connected to my board is the USB cable.

USB cable is all that you need but you need to know which COM port is the same assigned to. That needs to be set in Simulink Configuration under Peripheral setup.

0 user5005081 over 7 years ago in reply to Pavares Kiatsuarpanon

Prodigy 230 points

Pavares,

Have you solved the problem? I have the same problem.

0 Kostas Ntontis over 7 years ago in reply to user5005081

Intellectual 490 points

I have the same probem with F28335

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 'TI Delfino F2833x' target for 'c28x_serial_ext'.
Component:Simulink | Category:Model error

0 Brian McKay over 7 years ago in reply to Kostas Ntontis

Mastermind 9005 points

Hello Kostas,

I see this occasionally. Can happen for a couple reasons; either CCS/MATLAB has locked the USB port and the other piece of software cant access it, or a prior deployment of code was not stopped correctly. I normally reboot my PC (to reset USB ports) and repower the board, and I'm able to get the connection working again.

HTH,

-Brian

0 Masoud Bakhshi over 6 years ago in reply to Brian McKay

Prodigy 50 points

Hi all,
Would you please let me know how can I send a "Hello" to my computer by f28335! I know it is silly question but i searched a lot, I can send number (Not string) but i receive something else in computer.

0 Kostas Ntontis over 6 years ago in reply to Brian McKay

Intellectual 490 points

Hi Brian,

Well that workaround does not work for me. I use a jumber in J9. I change the baud rate from 115200 to 9600. I can not find a solution so far. There are other pins I have to use a jumber? Is it better to run external mode from Flash? Also I have CCS 6 and simulink 2017a.

0 Benny133 over 6 years ago in reply to Kostas Ntontis

Prodigy 20 points

Hello Kostas,

I had the same issue and solved it by adjusting the Target Configuration. Because you're using the Launchpad you have to set the Oscillator Clock in the "Clocking"-Tab to 10 MHz and the Pin assignment in the SCI-A-Tab to GPIO42 & GPIO43.

I hope that will help you.

Kind regards,

Benny

0 Mohamed Amine Fnaiech over 6 years ago

Prodigy 180 points

Dear Pavares,

Please if you find solution for the problem of external mode. Indeed, I work on eZdsp TMS320F28335, matlab 2016 and CSSV6 and I am facing to the same problem.

Thanks

0 Mohamed Amine Fnaiech over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

Dear Kostas,

If you find any solutiuon for an external communication. I use eZdsp TMS320F28335, matlab 2016 and CSSV6 and I am facing to same problem (exactly the same error)
I checked the PIN (TX, RX): I compare between datasheet and matlab configuration, I checked SW1 switch on the board but still the same error.
i search in google and no one was satisfied by any reply.

Regards

0 Kostas Ntontis over 6 years ago in reply to Mohamed Amine Fnaiech

Intellectual 490 points

Hi Mohamed,

I found the solution. In the Control Card there are very small switches. First you have to move the plastic film and then you can set the switch off or on. Go to Matlab - help - documentation and search for

Set Up Serial Communication with Target Hardware

The left switch must be open.

0 user5180999 over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

Did you any solution for this error

0 Kostas Ntontis over 6 years ago in reply to user5180999

Intellectual 490 points

Hi 5180999,

Yes for me it worked. Have you adjusted properly the switches?

0 user5180999 over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

ı am using ezdsp f28335(spectrum digital) control card. how to adjust properly. may you help me .

0 Mohamed Amine Fnaiech over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

Hi kostas,
I use ezdsp tms320f28335 so the hardware configuration is different but I have the same problem when I want to make external mode: I used matlab 2016, cssv6.
I will try next week to use matlab 2017 and css v7 and I hope that the result will be different.
Thanks.
Mohamed

0 Kostas Ntontis over 6 years ago in reply to Mohamed Amine Fnaiech

Intellectual 490 points

Hi,

Have you tried to look for instructions in the Matlab Help? How you try to connect with the DSP? With a usb?

0 Mohamed Amine Fnaiech over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

Yes.
The problem that the program is dowloaded directly to the target and start run (diode start blinking), I try to start external mode and I receive the error.
I saw that is a common problem for many user but no complete and satisfied response (no from TI or from matlab).
Best thanks

0 user5180999 over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

how to adjucts properly switches

0 Brian McKay over 6 years ago in reply to Mohamed Amine Fnaiech

Mastermind 9005 points

Hi Mohamed,

If you (or anyone) contacted MathWorks Technical Support and did NOT get a response, please PM me with your ticket #, and I will investigate.

@All: I forwarded this thread to my colleagues for review. If they have any suggestions, I will post them here.

Thanks,
-Brian

0 Kostas Ntontis over 6 years ago in reply to Mohamed Amine Fnaiech

Intellectual 490 points

Hi,
It is connected but it can't send data to the computer that is why is closing the connection - perhaps you must use a jumper somewhere in the DSP in order to close a circuit and open another-. If it is "really" connected then you must use time scope in the Simulink model. Scope can not be used with discrete time!

0 user5180999 over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

you mentioned switches is sw1 or sw2 ?

0 Kostas Ntontis over 6 years ago in reply to user5180999

Intellectual 490 points

Hi,

Have a look at this picture. Is it helpful?

0 venkatesh chilapur over 6 years ago in reply to Kostas Ntontis

Mastermind 6460 points

Hi,

For F28335 eZdsp board, the USB JTAG emulation does not support serial operation. Hence, along with USB that is used to download the program, user also needs to connect a serial cable from the DB9 connector on the board for SCI-A to the PC COM port to run the external mode. The PC COM port# is COM1.

I could run the external mode on this board by doing this connection. The default settings for SW2 switch were in place.

0 user5180999 over 6 years ago in reply to venkatesh chilapur

Prodigy 180 points

can I use xds100 jtag emülatör instead of canA?

0 user5180999 over 6 years ago in reply to venkatesh chilapur

Prodigy 180 points

can I use xds100 jtag emülatör instead of canA? may you reply this subject please

0 venkatesh chilapur over 6 years ago in reply to user5180999

Mastermind 6460 points

Hi,

I do not think it is possible. But, I leave it for expert to comment. xds100 works with JTAG interface to help user download and debug program over USB. CAN cannot be engaged for the same.

0 venkatesh chilapur over 6 years ago in reply to venkatesh chilapur

Mastermind 6460 points

Hi,

Please ensure you have a 'DB9 Male to DB9 Female 9C Serial Straight Thru Cable' for serial connection.

0 user5180999 over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

hi costas;

are you using tmdsdockf28335 ?

0 Kostas Ntontis over 6 years ago in reply to user5180999

Intellectual 490 points

Hi user518099932,

Yes I use this www.ti.com/.../TMDSDOCK28335.

0 user5180999 over 6 years ago in reply to Kostas Ntontis

Prodigy 180 points

where is j9 pin? ı was buyed tms320dockf28335

0 Johannes Schnabel over 6 years ago in reply to Kostas Ntontis

Prodigy 110 points

I have the same problem. Do you already have a working solution for that issue?

0 Johannes Schnabel over 6 years ago in reply to Johannes Schnabel

Prodigy 110 points

SOLVED!
(with the excellent help of Mathworks Technical Support)

1. Pins GPIO42 and GPIO43 must support SCI_A. For this board, we expect that pins GPIO42 (TX) and GPIO43 (RX) have been configured for SCI_A communication (TX and RX, respectively). Can you please confirm that this is the case?

2. The oscillator frequency must match the LaunchPad's external oscillator frequency. While the F28379D has an internal crystal that oscillates at 20MHz, the LaunchPad also has an external oscillator that runs at 10MHz. Simulink's default value is 20MHz. This setting is appropriate when working with the F28379D alone. However, this frequency value can cause problems when using external mode on a LaunchPad. Please go to Hardware Implementation -> Device details -> Clocking and change the value of "Oscillator clock (OSCCLK) frequency in MHz" from 20 to 10.

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LAUNCHXL-F28379D: MATLAB Simulink external mode error

Set Up Serial Communication with Target Hardware