[music-dsp] Problems with ADI C runtime function

[Greg Hurst]

Hello all.
I'm trying to get a FIR to work on an EZ-Kit 21160M. I'm using ADI's fir C runtime library function. I'm following the instructions in the VDSP documentation to the letter, but all I get is zeros back. I'm using a 128-element floating point array as an input, containing all zeros and a 1 in
the fifth element, i.e. a simulated impulse.
As stated in the docs, I've initialised the state[] array to zeros and made it one element longer than the coeffs[] array. The 128 coefficients were generated in SystemView. I have not reversed the order of the coefficients
as stated, but as they're symmetrical I can't see this is a problem. I use a for loop to call the function, storing the return values in float output[128], but as I say all I get is zeros.
Anyone else had problems using this function? Sorry if this is a basic
question, but I can't see what I'm doing wrong.

Thanking you in advance for any help,
GH.


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