"TMS320C55x DSP Library DSPLIB Programmer's Reference"

cfirCFFT – NOSCALEFFT Size Cycles † Code Size (in bytes)8 139 32516 246 32532 477 32564 996 325128 2171 325256 4818 325512 10729 3251024 23808 325† Assumes all data is in on-chip dual-access RAM and that there is no bus conflict due to twiddletable reads and instruction fetches (provided linker command file reflects those conditions).cfirFunctionComplex FIR Filterushort oflag = cfir (DATA *x, DATA *h, DATA *r, DATA *dbuffer, ushort nx,ushort nh)Argumentsx[2*nx]Pointer to input vector of nx complex elements.h[2*nh] Pointer to complex coefficient vector of size nh innormal order. For example, if nh=6, then h[nh] ={h0r, h0i, h1r, h1i h2r, h2i, h3r, h3i, h4r, h4i, h5r, h5i}where h0 resides at the lowest memory address inthe array.This array must be located in internal memory sinceit is accessed by the C55x coefficient bus.r[2*nx]Pointer to output vector of nx complex elements.In-place computation (r = x) is allowed.Function Descriptions4-17