CCS/CODECOMPOSER: CCS 7 Graph Tool - How to plot FFT magnitude correctly

David__

Genius 3585 points

Other Parts Discussed in Thread: CODECOMPOSER

art Number: CODECOMPOSER

Tool/software: Code Composer Studio

Hi, I have the TI's TM4C123GXL Tiva Launchpad.

I'm referring the Tiva Launchpad Workshop document - Procedure 10 of Lab 9.

In lab 9, it calls the "sinf" function and plots it using CCS.

I use Matlab 2016 and CCS 7.1.0.00016 on 64-bit Windows 10 machine.

// float gSeriesData[SERIES_LENGTH];
float gSeriesData[  ] = {
#include "matlab/mySignal.txt"
// Used Matlab to generate sum of cosine waves which have
// 73.51Hz(Note D2), 97.99Hz(G2), 146.8 Hz (D3), and 293.67 Hz (D4) (only real values, no imaginary values)
// + Zero padded + Hanning Window
// Signal length = 4096, Sampling Frequency = 1024 Hz
};

I replaced that part and plotted the single time graph.

This part is great. I don't have to execute Matlab all the time to check the values of the array.

However, I had trouble configuring the FFT Magnitude graph.

Even worse, sometimes, I cannot select those graphs; they were grayed out while I'm debugging with CCS 7 and the Tiva Launchpad.

In short, I want to ask the following;

1) I expected the FFT feature to analyze the frequency of the signal array.

Can you help me with configuring the FFT Magnitude graph?

How should I configure it to get the same result which is shown from Matlab?

2) Why is the Graph section becomes grayed out?

How can I fix this?

over 7 years ago

0 desouza over 7 years ago

TI__Guru**** 169234 points

David,

Thanks for reporting this. Would you mind sharing the file <mySignal.txt> so I could try to validate the Graph? This way I can be sure that we are trying to plot the same thing.

Regards,
Rafael

0 David__ over 7 years ago in reply to desouza

Genius 3585 points

Hi, Rafael. I have attached the text file.

mySignal.txt

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Can you take a look, please?

0 desouza over 7 years ago in reply to David__

TI__Guru**** 169234 points

David,

I was able to see the same low-resolution FFT Magnitude plot as shown in your previous screen. However, the order of the FFT can be increased to improve the accuracy and match whatever is displayed by Matlab:

I saw that values above 16 yielded wrong plots, thus 15 seems to be a hard limit.

Please give a try to set this parameter and see if it works well for you.

Hope this helps,

Rafael

0 David__ over 7 years ago in reply to desouza

Genius 3585 points

Hi, Rafael. Thanks for your answer. However, I left my launchpad at home. So I will try your solution soon.

In the meantime, I have few more to ask.

desouza said:
I saw that values above 16 yielded wrong plots, thus 15 seems to be a hard limit.

1. I haven't increased the value, yet. I didn't understand the term "hard limit".

Is that "hard limit" varies from computers which I use to run CCS 7 or that related to the sampling frequency?

2. I don't know how to regenerate this "graying out" problem.

Do you know how to enable the graph menus without restarting CCS 7?

3. Lastly, since I left my launchpad, I was curious whether a debug simulation, debug code without any JTAGs, is possible with CCS 7

If I don't have the launchpad, is it not possible to simulate my code?

If this is possible, I would try your FFT configuration suggestion immediately.

0 desouza over 7 years ago in reply to David__

TI__Guru**** 169234 points

David,

David__ said:
Is that "hard limit" varies from computers which I use to run CCS 7 or that related to the sampling frequency?

As far as I can tell at this point, the FFT Magnitude graph tool is limited to a window size of 32768 (or 2¹⁵) regardless of the sample size.

David__ said:
Do you know how to enable the graph menus without restarting CCS 7?

Graphs should be enabled as long as you have your target halted. I personally have never seen these options greyed out.

David__ said:
If I don't have the launchpad, is it not possible to simulate my code?

Not anymore. SW simulators were removed from the product when CCSv6.x was released. Sorry.

Regards,

Rafael

0 desouza over 7 years ago in reply to desouza

TI__Guru**** 169234 points

David,

BTW, I filed the bug number DVT-1908 to address the FFT Order limitation. In about half hour please check its status in the link SDOWP in my signature below.

Regards,
Rafael

0 David__ over 7 years ago in reply to desouza

Genius 3585 points

Hi, Rafael. This is David. Thanks for your support!

desouza said:
Graphs should be enabled as long as you have your target halted.

You were right! Mostly, the options were grayed out when the debugger was running.

But now always! After the view changed to "CCS Debug" view, I didn't press the "Resume" button.

Sometimes, regardless of pressing it, it is grayed out.

desouza said:
SW simulators were removed from the product when CCSv6.x was released. Sorry.

You don't have to apologize! No wonder, I took out my memory of CCS 5 which I used 4 years ago.

I have tested with my launchpad with a 64-bit Windows 7 SP1 desktop.

[1] FFT order = 15

[2] FFT order = 16

[3] FFT order = 24

Unexpected results!

Also, I have checked the status of "DVT-1908".

In conclusion, I guess I should not rely much on the CCS's FFT graph feature.

Then, by any chances, is there links related to memory dumping feature of CCS 7?

Maybe I should dump the global variables' values as a text file.

If format (hexadecimal format or 32/64 bit float value format) can be chosen, it would be great.

After this, let's finish the case!

0 desouza over 7 years ago in reply to David__

TI__Guru**** 169234 points

David,

Please apologize for the delay; I was out of the office for two weeks.

I noticed the same displayed problems when using a FFT order larger than 15, but not the inability to minimize the view - one thing I noticed is that, for larger FFT orders, CCS took a while to finish processing which delayed any screen updates.

>>Then, by any chances, is there links related to memory dumping feature of CCS 7?
Yes. Please check section 3.3 of:
processors.wiki.ti.com/.../GSG:Debugging_projects_v5

Hope this helps,
Rafael

Code Composer Studio™︎

Code Composer Studio forum

CCS/CODECOMPOSER: CCS 7 Graph Tool - How to plot FFT magnitude correctly