Bit Reverse Complex Library
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Bit Reverse Complex Library

mikroBasic PRO for dsPIC30/33 and PIC24 includes a Bit Reverse Complex Library for DSP engine. All routines work with fractional Q15 format.

Library Routines

BitReverseComplex

Prototype

sub procedure BitReverseComplex(dim log2N as word, dim byref ReIm as word[1024])
Description

This function does Complex (in-place) Bit Reverse re-organization.
Parameters
  • N: buffer length (must be the power of 2).
  • ReIm: output sample(from FFT).
Returns

Nothing.
Requires

Nothing.
Example 
dim InputSamples as word[512] ydata     ' Y data is required by FFT routine
                                                 ' See datasheet for your dsPIC to see Y data space limits.
...

' Perform FFT (DFT), 7 stages, 128 samples of complex pairs
' Twiddle factors are taken from help
FFT(8, word(@TwiddleCoeff_256), InputSamples)

' DFT butterfly algorythm bit-reverses output samples.
' We have to restore them in natural order.
BitReverseComplex(8, InputSamples)
Notes

Input samples must be in Y data space.
Copyright (c) 2002-2012 mikroElektronika. All rights reserved.
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