文件列表:

DEF21020.H (7253, 1991-05-02)
DOIT.BAT (49, 1991-04-18)
FFT.ACH (581, 1993-12-14)
FFT.DOC (9338, 1991-08-21)
FFTRAD2.ASM (14267, 1994-11-07)
FFTRAD2.EXE (8596, 1994-09-23)
FFTRAD4.ASM (14255, 2001-04-24)
FFTRAD4.EXE (9444, 1994-09-23)
INIMAG.DAT (6144, 1994-09-23)
INREAL.DAT (6144, 1994-09-23)
MAKEWAVE.C (3318, 1993-12-14)
MAKEWAVE.EXE (29220, 1991-04-19)
PLOTLOG.M (1197, 1991-03-21)
TC2.DAT (3072, 1994-09-23)
TC4.DAT (4608, 1994-09-23)
TS2.DAT (3072, 1994-09-23)
TS4.DAT (4608, 1994-09-23)
TWIDRAD2.C (1762, 1993-12-14)
TWIDRAD2.EXE (28582, 1991-06-13)
TWIDRAD4.C (2840, 1993-12-14)
TWIDRAD4.EXE (29074, 1991-06-13)

____________________________________________________________________________ README.FT2 Version 25-APR-91, Analog Devices DSP Applications (617) 461-3672 Modified 23-SEP-94 This directory contains code and utilities for running and testing a radix-2 FFT on the ADSP-21020. A PC-MATLAB script file PLOTLOG.M is included for ploting and comparison of FFT results. The constants and test files are setup for an N=256 point FFT. To use as is just type "DOIT FFTRAD2". The batch file will end up in the ADSP-21020 simulator. To simulate the FFT and examine the results: - Set a breakpoint at location 0xb. - Run until the breakpoint is reached. - Open a DM window and ^T until it is in a floating point format. - Set the display precision to 9 digits. - Use ^D to dump refft (0x0000 to 0x00ff) to the file rdata.dat. - Use ^D to dump imfft (0x4000 to 0x40ff) to the file idata.dat. - Quit the simulator. If you have PC-MATLAB: - Run the PC-MATLAB TRANSLATE program on rdata.dat,idata.dat, inreal.dat, and inimag.dat using all the defaults. - Run MATLAB. - Type PLOTLOG and enter the number of points in the FFT. To change the length: run the twiddle factor generation C program TWIDRAD2.EXE; run the test input program MAKEWAVE.EXE to create new real and imaginary input test waveforms; edit the souce code FFTRAD2.ASM to change the specified constants; the assemble and link with the MAKE.BAT PCDOS batch file. The batch file will end up in the ADSP-21020 simulator. File descriptions: fftrad2.asm - ADSP-21020 assembly code for FFT fft.ach - architecture file for FFT def21020.h - definitions for bits in the ADSP-21020's system regs doit.bat - DOS batch file to assemble, link, and start simulator twidrad2.c - source for FFT twiddle factor generation program makewave.c - source for FFT test waveform generation program plotlog.m - PC-MATLAB script for plotting FFT results tc2.dat - real twiddle factors from TWIDRAD2 program ts2.dat - imaginary twiddle factors from TWIDRAD2 program inreal.dat - real input array inimag.dat - imaginary input array rdata.dat - real input array for PLOTLOG MATLAB script idata.dat - imaginary input array for PLOTLOG MATLAB script Goodluck. ____________________________________________________________________________

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