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Guest
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 Posted:
Thu Dec 22, 2005 5:16 pm Post subject:
How to do a FFT ? Comment faire une FFT ? |
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Hello ,
I am a new user of the TMS320C6711 DSP and i would like to know how i
must do to make an fft with this device.
Actually I acquire six tensions with an analog to digital converter and
i would like to analyse the frequencies of these tension.
Thank you per advance for your help
regards
Vincent.W
The devices that i employed :
- OSR 116 acquissition board :
http://www.traquair.com/products/microline/ors116.html
- 6711 board : http://www.traquair.com/products/microline/c6x11cpu.html |
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Guest
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| Posted:
Sat Dec 24, 2005 5:16 pm Post subject:
Re: How to do a FFT ? Comment faire une FFT ? |
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I used sp_fftSPxSP.
DSPF_sp_fftSpxSP(FFTLEN,&in[0],&w[0],scratch,brev,2,0,FFTLEN);
This is a mixed radix, cache optimized routine specially made for c67x.
You can find good docs on the internet.
http://focus.ti.com/docs/apps/catalog/resources/appnoteabstract.jhtml?abstractName=spru657b
The sp means single precision. The w and brev arguments will need to
be calculated ahead of time. There is a tool for calculating w. You
have to be very careful when using TI's optimized routines. There are
many special requirements - like padding arrays and an even number of
elements. I suggest you try an example in the emulator to verify it
works.
http://www.signalsguru.net |
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John Herman
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