Matrix user forums

Hi Ben

Thanks for the update. Eagerly awaiting a solution.

By the way, this is not a chip specific problem I hope, as I intend to migrate to 30F3012 (18 pin) as the final chip. I'm presently using the 4013 because of the extra peripherals to aid in the diagnostics as the program evolves.

Larry

Hi Ben
Yes commercial project.
I don't have a hard deadline but I am being pushed.
Larry

Hi Ben
Thank you. A solution would be awesome.
Larry

I just noticed in the console that the Input buffer contains 32 pieces of data which is correct for the buffer size allocated, however after the FFT is processed the console shows 192 pieces of data for FFT_Real buffer and the same for FFT_imag buffer which also has 32 spaces allocated for each. Thi...

Hi Jac
Wave form is sine wave from a function generator. I tried 0 center and also 0 at the bottom on the sine wave with the same results in both cases. I also checked the input sine wave on a scope. Larry

Hi Jac Thank you very much for your reply. I did not know that about the Interrupt and there are so many warnings that I do not know how to interpret I basically ignore them which I guess is not smart. Every time you post I learn something. I corrected the read data 31 to 32 by changing the count to...

Hi Benj
I sent you a PM asking you to check the above post with no reply. I need to know if I am doing something wrong or if there is a problem with the FFT module because the program seems to simulate ok but does not work properly after it has been compiled to chip.
Larry

Hi Jac
Would you please take a look at my FFT program, does not seem to work right.
Larry

Hi Ben
It now works as expected.
Larry

Hi Ben

Please check the attached program. ADC does not seem to be working as expected. with raw enabled the adc only reads 1 time when the program is loaded to the chip. Yet in simulation it works ok.
Larry

Hi Jac Thank you for the response. I am wondering if there is an error in Flowcode 6 for chip 30F4013. I did a search and found nothing. I am using AN8 which is on Port BH. I wrote a program to just read ADC using RawSampleInt with raw enable at the start of the program and it would only read the AD...

Hi Jac Can you tell me why for the ADC conversion the "RawSampleInt" is used instead of say "Get Int". Also, the above ref program uses Raw enable only once at the start of the program which seems to simulate ok but when I load it to a real chip the ADC only reads once at start-up. I wrote a test AD...

Thank you Jac

You were right on. Program is running, but not as expected. I will play with it some more so I may better understand.

Larry

I cut the buffers to 128 and then it seemed to compile to the chip. It didn't run when it got there but at least it got there. That's one step forward.

Larry

Hi Jac

I think this is the output file you are asking about. I can cut the size of the buffers in half or even smaller as I am only interested in Audio up to 1200 HZ

Larry

I modified the FFT_test.fcfx program for 30F4013 chip but it will not program to that chip via the EB064 multi programmer board. Am I doing something wrong.

This is the modified program: Larry

Hi Jac

Thank you very much for the reply. That is exactly what I was after. Your explanation helps a lot and the reading references you pointed to are also helpful. I have already scanned through them, but I will have to read them slowly a couple of more times.

Larry

Hi If I read a bin after the FFT is performed using "ReadFrequencyBank", I see in the help file that a byte will be returned. What will that byte represent? For instance 00 might mean no frequencies in that bin range and inversely FF might mean a large amount of frequencies in that bin range of freq...

Thanks Ben

Thanks Hyper

That helps a lot!

Larry

Hi Ben I have been studying the above subject Program from the component/DSP/FFT help page, so that I might understand using the DSP-FFT component. I am starting to get a little bit of a handle on it but I have 2 things at the moment that are causing me confusion. First: The program uses a couple of...

Hi I am trying to work through the DSP training course and having a minor problem. I loaded the 1st program, Audio through, by compile to chip and it seems to be working OK. When I plug power to the board, it constantly resets, which I can tell by the gLCD display initializes constantly. After revie...

Hi Ben
Ok, good news. Then I do understand what is going on.

Thank you very much for your help.

Larry

Hi Ben

Thank you. I posted another question there.

Larry

Hi Ben That was extremely helpful. I have a much better understanding. I do have 1 loose end. The explanation in the DSP training manual. Calc.jpg If I understand it correctly, then Initially should read .upper 00001010 and not (101001100) and .lower 10000000 and not (10000001) to account for the le...