TMS320F28069M: Error while using Extern Mode with matlab.

Sharat Yadav

Part Number: TMS320F28069M

I have been using matlab in extern mode and i am aware of basic settings, And was doing extern mode but all of sudden this error started to appear.

over 5 years ago

0 Sharat Yadav over 5 years ago

Expert 1015 points

I am able to dump the code using CCS, but with matlab neither extern mode nor the build and dump is working.
Hope somebody can help.

0 Yanming Luo over 5 years ago in reply to Sharat Yadav

TI__Guru** 112440 points

You might have a look at the following link that could help you with this question.
e2e.ti.com/.../770584

0 venkatesh chilapur over 5 years ago in reply to Yanming Luo

Mastermind 6460 points

Hi,

The error occurs when the Host lost connection to target for various reasons.

1. The target has undergone a running reset.

2. The target is overrunning and can send the external mode message to host in background.

3. The communication link can be a issue like loose connection.

To avoid the problem or debug, try to run the model at lower sample rates, ensure a good cable is used for connection, try increasing the baudrate of the SCI peripheral, ensure the target code is running without issue.

0 Sharat Yadav over 5 years ago in reply to venkatesh chilapur

Expert 1015 points

Hi Venkatesh,

i agree with the solution suggested by you, as a model with GPIO is working fine with f28069M in extern mode but a slightly bigger model with ecap and epwm and few GPIOs shows me this error, I tried few permutations as suggested by you with SCI baudrate as well as Sample rate of matlab, but didnt got much sucess, Can you please suggest me any good or optimum value for both of them.

0 venkatesh chilapur over 5 years ago in reply to Sharat Yadav

Mastermind 6460 points

Hi,

For F28069 Launchpad, set the baud rate to 5.625e6.
You can also explore the 2 model approach as described in the page:

in.mathworks.com/.../permanent-magnet-synchronous-motor-field-oriented-control.html

Look for section:
Fast Serial Data Monitoring;

0 Sharat Yadav over 5 years ago in reply to venkatesh chilapur

Expert 1015 points

Still the issue is not resolved, though it did worked in extern mode but again its not working.

whereas a template GPIO based code is running in extern properly.

Below are the settings that i had kept.

1) device manage = comport baud 921600 (max)

2) Matlab sciA baudrate 5625000 (as suggested, even tried various combination of device manage baudrate with sci baudrate.)

3) Solver ->additional para : fundamental sample time : 100e-6 and 50e-6 (tried with both).

since basic gpio and periph codes are running properly, i assume that error(2) (2. The target is overrunning and can send the external mode message to host in background.) as pointed by you might be the reason (as i can see code getting dumped and running on c2000 but on matlab the error as in question appears.

Can you suggest a cure for this or any other reason that you might think as a reason for this.

0 venkatesh chilapur over 5 years ago in reply to Sharat Yadav

Mastermind 6460 points

Hi,

Please try this:

You can also explore the 2 model approach as described in the page:

in.mathworks.com/.../permanent-magnet-synchronous-motor-field-oriented-control.html

Look for section:
Fast Serial Data Monitoring;

0 Sharat Yadav over 5 years ago in reply to venkatesh chilapur

Expert 1015 points

1) I am not aware with what you exactly mean with 2 model approach. Can you enlighten me about what it exactly is.?
2) Is there any restriction on usage of certain matlab blocks (viz. gain or product etc or any other) while operating in EXTERN mode.

0 venkatesh chilapur over 5 years ago in reply to Sharat Yadav

Mastermind 6460 points

Hi,

Please use the following post that can guide on using the 2 model approach.

in.mathworks.com/.../353939-can-simulink-use-ti-c2000-launchxl-f28027f-or-f2808-to-monitor-a-analog-signal-200khz

www.mathworks.com/.../419321-what-is-the-idea-behind-data-processing-for-sci-communication-in-dc-dc-buck-converter-example

0 Sharat Yadav over 5 years ago in reply to venkatesh chilapur

Expert 1015 points

i read the post that you suggested, will work on it.

Though, the error asked in the question is solved.

I have a difficulty, and hope you can help me.

while I am dumping the code on the f28069m the motor is running at 450rpm (as desired) but when I am make the process in extern mode, the motor is reduced to near 420 rpm, and i haven't made any changes to the matlab code still. I guess this slowness is due to extern loop.

So why it is actually happening and how to eliminate thing.

0 venkatesh chilapur over 5 years ago in reply to Sharat Yadav

Mastermind 6460 points

Hi Sharat,

The external mode adds its own files to the build that also add computation overhead.

You motor control loop may be suffering from this overhead. These are issues customer often face when running computation intensive algorithms at high sample rate and trying to use external mode on top of it. Hence to solve this pain we have come with 2 model approach to customer.

Hope this helps,

0 Sharat Yadav over 5 years ago in reply to venkatesh chilapur

Expert 1015 points

Thank You Venkatesh,
I am following your guidance, I have gone through the post but i not able to configure the sci trans and recieve module.

0 Sharat Yadav over 5 years ago in reply to Sharat Yadav

Expert 1015 points

Are there any steps that i need to take care while setting in both of these models?

0 Sharat Yadav over 5 years ago in reply to Sharat Yadav

Expert 1015 points

And how does the premtible flag in CPU Hardware Interrupt funtions, I had read the matlab disription but not much getting it.

0 Sharat Yadav over 5 years ago in reply to Sharat Yadav

Expert 1015 points

This is the error that i am often getting when using sci host in host model, without sci host i am not getting any output. so in both cases, its not working.

0 Sharat Yadav over 5 years ago in reply to Sharat Yadav

Expert 1015 points

This is the error that i am often getting when using sci host in host model, without sci host i am not getting any output. so in both cases, its not working.

0 Brian McKay over 5 years ago in reply to Sharat Yadav

Mastermind 9005 points

Hi Sharat,

Reading through this thread, I think it might be best for you to contact MathWorks Technical Support directly so they can help debug/analyze your model.

Cheers,

-Brian

0 venkatesh chilapur over 5 years ago in reply to Brian McKay

Mastermind 6460 points

Hi Sharat,

I agree with Brian.

The best way to help you is via tech support from MathWorks.

They can guide you through WebEx on how to Setup the SCI blocks and troubleshoot other issues.

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TMS320F28069M: Error while using Extern Mode with matlab.