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[/] [dblclockfft/] [trunk/] [bench/] [cpp/] [ifft_tb.cpp] - Blame information for rev 23

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//
// Filename:    ifft_tb.cpp
//
// Project:     A Doubletime Pipelined FFT
//
// Purpose:     A test-bench for the combined work of both fftmain.v and
//              ifftmain.v.  If they work together, in concert like they should,
//              then the operation of both in series should yield an identity.
//              This program attempts to check that identity with various
//              inputs given to it.
//
//              This file has a variety of dependencies, not the least of which
//              are verilator, ifftmain.v and fftmain.v (both produced by
//              fftgen), but also on the ifft_tb.v verilog test bench found
//              within this directory.
//
// Creator:     Dan Gisselquist, Ph.D.
//              Gisselquist Tecnology, LLC
//
///////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2015, Gisselquist Technology, LLC
//
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of  the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program.  (It's in the $(ROOT)/doc directory, run make with no
// target there if the PDF file isn't present.)  If not, see
// <http://www.gnu.org/licenses/> for a copy.
//
// License:     GPL, v3, as defined and found on www.gnu.org,
//              http://www.gnu.org/licenses/gpl.html
//
//
///////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include <math.h>
#include <assert.h>
 
#include "verilated.h"
#include "Vifft_tb.h"
#include "twoc.h"
 
#define LGWIDTH 11
#define IWIDTH  16
#define MWIDTH  22
#define OWIDTH  28
 
#define FFTLEN  (1<<LGWIDTH)
 
class   IFFT_TB {
public:
        Vifft_tb        *m_tb;
        unsigned int    m_log[8*FFTLEN];
        long            m_data[2*FFTLEN];
        int             m_iaddr, m_oaddr, m_offset;
        FILE            *m_dumpfp;
        // double               *m_tb_buf;
        // int                  m_ntest;
        bool            m_syncd;
 
        IFFT_TB(void) {
                m_tb = new Vifft_tb;
                m_iaddr = m_oaddr = 0;
                m_dumpfp = NULL;
 
                m_syncd = false;
                // m_ntest = 0;
        }
 
        void    tick(void) {
                m_tb->i_clk = 0;
                m_tb->eval();
                m_tb->i_clk = 1;
                m_tb->eval();
        }
 
        void    reset(void) {
                m_tb->i_ce  = 0;
                m_tb->i_rst = 1;
                tick();
                m_tb->i_rst = 0;
                tick();
 
                m_iaddr = m_oaddr = 0;
                m_syncd = false;
        }
 
        long    twos_complement(const long val, const int bits) {
                return sbits(val, bits);
        }
 
        void    checkresults(void) {
        /*
                double  *dp, *sp; // Complex array
                double  vout[FFTLEN*2];
                double  isq=0.0, osq = 0.0;
                long    *lp;
 
                // Fill up our test array from the log array
                printf("%3d : CHECK: %8d %5x\n", m_ntest, m_iaddr, m_iaddr);
                dp = m_tb_buf; lp = &m_log[(m_iaddr-FFTLEN*3)&((4*FFTLEN-1)&(-FFTLEN))];
                for(int i=0; i<FFTLEN; i++) {
                        long    tv = *lp++;
 
                        dp[0] = twos_complement(tv >> IWIDTH, IWIDTH);
                        dp[1] = twos_complement(tv, IWIDTH);
 
                        printf("IN[%4d = %4x] = %9.1f %9.1f\n",
                                i+((m_iaddr-FFTLEN*3)&((4*FFTLEN-1)&(-FFTLEN))),
                                i+((m_iaddr-FFTLEN*3)&((4*FFTLEN-1)&(-FFTLEN))),
                                dp[0], dp[1]);
                        dp += 2;
                }
 
                // Let's measure ... are we the zero vector?  If not, how close?
                dp = m_tb_buf;
                for(int i=0; i<FFTLEN; i++)
                        isq += (*dp) * (*dp);
 
                fftw_execute(m_plan);
 
                // Let's load up the output we received into vout
                dp = vout;
                for(int i=0; i<FFTLEN; i++) {
                        long    tv = m_data[i];
 
                        printf("OUT[%4d = %4x] = ", i, i);
                        printf("%16lx = ", tv);
                        *dp = twos_complement(tv >> OWIDTH, OWIDTH);
                        printf("%12.1f + ", *dp);
                        osq += (*dp) * (*dp); dp++;
                        *dp = twos_complement(tv, OWIDTH);
                        printf("%12.1f j", *dp);
                        osq += (*dp) * (*dp); dp++;
                        printf(" <-> %12.1f %12.1f\n", m_tb_buf[2*i], m_fft_buf[2*i+1]);
                }
 
 
                // Let's figure out if there's a scale factor difference ...
                double  scale = 0.0, wt = 0.0;
                sp = m_tb_buf;  dp = vout;
                for(int i=0; i<FFTLEN*2; i++) {
                        scale += (*sp) * (*dp++);
                        wt += (*sp) * (*sp); sp++;
                } scale = scale / wt;
 
                if (wt == 0.0) scale = 1.0;
 
                double xisq = 0.0;
                sp = m_tb_buf;  dp = vout;
                for(int i=0; i<FFTLEN*2; i++) {
                        double vl = (*sp++) * scale - (*dp++);
                        xisq += vl * vl;
                }
 
                printf("%3d : SCALE = %12.6f, WT = %18.1f, ISQ = %15.1f, ",
                        m_ntest, scale, wt, isq);
                printf("OSQ = %18.1f, ", osq);
                printf("XISQ = %18.1f\n", xisq);
                m_ntest++;
                */
        }
 
        bool    test(int lft, int rht) {
                m_tb->i_ce    = 1;
                m_tb->i_rst   = 0;
                m_tb->i_left  = lft;
                m_tb->i_right = rht;
 
                m_log[(m_iaddr++)&(8*FFTLEN-1)] = lft;
                m_log[(m_iaddr++)&(8*FFTLEN-1)] = rht;
 
                tick();
 
                if ((m_tb->o_sync)&&(!m_syncd)) {
                        m_offset = m_iaddr;
                        m_oaddr = 0;
                        m_syncd = true;
                }
 
                m_data[(m_oaddr++)&(FFTLEN-1)] = m_tb->o_left;
                m_data[(m_oaddr++)&(FFTLEN-1)] = m_tb->o_right;
 
                if ((m_syncd)&&((m_oaddr&(FFTLEN-1)) == 0)) {
                        dumpwrite();
                        // checkresults();
                }
 
                return (m_tb->o_sync);
        }
 
        bool    test(double lft_r, double lft_i, double rht_r, double rht_i) {
                int     ilft, irht, ilft_r, ilft_i, irht_r, irht_i;
 
                assert(2*IWIDTH <= 32);
                ilft_r = (int)(lft_r) & ((1<<IWIDTH)-1);
                ilft_i = (int)(lft_i) & ((1<<IWIDTH)-1);
                irht_r = (int)(rht_r) & ((1<<IWIDTH)-1);
                irht_i = (int)(rht_i) & ((1<<IWIDTH)-1);
 
                ilft = (ilft_r << IWIDTH) | ilft_i;
                irht = (irht_r << IWIDTH) | irht_i;
 
                return test(ilft, irht);
        }
 
        double  rdata(int addr) {
                long    ivl = m_data[addr & (FFTLEN-1)];
 
                ivl = twos_complement(ivl >> OWIDTH, OWIDTH);
                return (double)ivl;
        }
 
        double  idata(int addr) {
                long    ivl = m_data[addr & (FFTLEN-1)];
 
                ivl = twos_complement(ivl, OWIDTH);
                return (double)ivl;
        }
 
        void    dump(FILE *fp) {
                m_dumpfp = fp;
        }
 
        void    dumpwrite(void) {
                if (!m_dumpfp)
                        return;
 
                double  *buf;
 
                buf = new double[FFTLEN * 2];
                for(int i=0; i<FFTLEN; i++) {
                        buf[i*2] = rdata(i);
                        buf[i*2+1] = idata(i);
                }
 
                fwrite(buf, sizeof(double), FFTLEN*2, m_dumpfp);
                delete[] buf;
        }
};
 
 
int     main(int argc, char **argv, char **envp) {
        Verilated::commandArgs(argc, argv);
        IFFT_TB *tb = new IFFT_TB;
        FILE    *fpout;
 
        fpout = fopen("ifft_tb.dbl", "w");
        if (NULL == fpout) {
                fprintf(stderr, "Cannot write output file, fft_tb.dbl\n");
                exit(-1);
        }
 
        tb->reset();
        tb->dump(fpout);
 
        //     1 -> 0x0001 
        //     2 -> 0x0002 
        //     4 -> 0x0004 
        //     8 -> 0x0008 
        //    16 -> 0x0010 
        //    32 -> 0x0020 
        //    64 -> 0x0040 
        //   128 -> 0x0080 
        //   256 -> 0x0100 
        //   512 -> 0x0200 
        //  1024 -> 0x0400 
        //  2048 -> 0x0800
        //  4096 -> 0x1000
        //  8192 -> 0x2000
        // 16384 -> 0x4000
        for(int v=1; v<32768; v<<=1) for(int k=0; k<FFTLEN/2; k++)
                tb->test((double)v,0.0,(double)v,0.0);
        //     1 -> 0xffff      
        //     2 -> 0xfffe
        //     4 -> 0xfffc
        //     8 -> 0xfff8
        //    16 -> 0xfff0
        //    32 -> 0xffe0
        //    64 -> 0xffc0
        //   128 -> 0xff80
        //   256 -> 0xff00
        //   512 -> 0xfe00
        //  1024 -> 0xfc00
        //  2048 -> 0xf800
        //  4096 -> 0xf000
        //  8192 -> 0xe000
        // 16384 -> 0xc000
        // 32768 -> 0x8000
        for(int v=1; v<=32768; v<<=1) for(int k=0; k<FFTLEN/2; k++)
                tb->test(-(double)v,0.0,-(double)v,0.0);
        //     1 -> 0x000040    CORRECT!!
        //     2 -> 0x000080 
        //     4 -> 0x000100 
        //     8 -> 0x000200
        //    16 -> 0x000400
        //    32 -> 0x000800
        //    64 -> 0x001000
        //   128 -> 0x002000
        //   256 -> 0x004000
        //   512 -> 0x008000
        //  1024 -> 0x010000
        //  2048 -> 0x020000
        //  4096 -> 0x040000
        //  8192 -> 0x080000
        // 16384 -> 0x100000
        for(int v=1; v<32768; v<<=1) for(int k=0; k<FFTLEN/2; k++)
                tb->test(0.0,(double)v,0.0,(double)v);
        //     1 -> 0x3fffc0
        //     2 -> 0x3fff80
        //     4 -> 0x3fff00
        //     8 -> 0x3ffe00
        //    16 -> 0x3ffc00
        //    32 -> 0x3ff800
        //    64 -> 0x3ff000
        //   128 -> 0x3fe000
        //   256 -> 0x3fc000
        //   512 -> 0x3f8000
        //  1024 -> 0x3f0000
        //  2048 -> 0x3e0000
        //  4096 -> 0x3c0000
        //  8192 -> 0x380000
        // 16384 -> 0x300000
        for(int v=1; v<32768; v<<=1) for(int k=0; k<FFTLEN/2; k++)
                tb->test(0.0,-(double)v,0.0,-(double)v);
 
        // 61. Now, how about the smallest alternating real signal
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(2.0,0.0,0.0,0.0); // Don't forget to expect a bias!
        // 62. Now, how about the smallest alternating imaginary signal
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(0.0,2.0,0.0,0.0); // Don't forget to expect a bias!
        // 63. Now, how about the smallest alternating real signal,2nd phase
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(0.0,0.0,2.0,0.0); // Don't forget to expect a bias!
        // 64.Now, how about the smallest alternating imaginary signal,2nd phase
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(0.0,0.0,0.0,2.0); // Don't forget to expect a bias!
 
        // 65.
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(32767.0,0.0,-32767.0,0.0);
        // 66.
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(0.0,-32767.0,0.0,32767.0);
        // 67.
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(-32768.0,-32768.0,-32768.0,-32768.0);
        // 68.
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(0.0,-32767.0,0.0,32767.0);
        // 69.
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(0.0,32767.0,0.0,-32767.0);
        // 70. 
        for(int k=0; k<FFTLEN/2; k++)
                tb->test(-32768.0,-32768.0,-32768.0,-32768.0);
 
        // 71. Now let's go for an impulse (SUCCESS)
        tb->test(16384.0, 0.0, 0.0, 0.0);
        for(int k=0; k<FFTLEN/2-1; k++)
                tb->test(0.0,0.0,0.0,0.0);
 
        // 72. And another one on the next clock (FAILS, ugly)
        //      Lot's of roundoff error, or some error in small bits
        tb->test(0.0, 0.0, 16384.0, 0.0);
        for(int k=0; k<FFTLEN/2-1; k++)
                tb->test(0.0,0.0,0.0,0.0);
 
        // 73. And an imaginary one on the second clock
        //      Much roundoff error, as in last test
        tb->test(0.0, 0.0, 0.0, 16384.0);
        for(int k=0; k<FFTLEN/2-1; k++)
                tb->test(0.0,0.0,0.0,0.0);
 
        // 74. Likewise the next clock
        //      Much roundoff error, as in last test
        tb->test(0.0,0.0,0.0,0.0);
        tb->test(16384.0, 0.0, 0.0, 0.0);
        for(int k=0; k<FFTLEN/2-2; k++)
                tb->test(0.0,0.0,0.0,0.0);
 
        // 75. And it's imaginary counterpart
        //      Much roundoff error, as in last test
        tb->test(0.0,0.0,0.0,0.0);
        tb->test(0.0, 16384.0, 0.0, 0.0);
        for(int k=0; k<FFTLEN/2-2; k++)
                tb->test(0.0,0.0,0.0,0.0);
 
        // 76. Likewise the next clock
        //      Much roundoff error, as in last test
        tb->test(0.0,0.0,0.0,0.0);
        tb->test(0.0, 0.0, 16384.0, 0.0);
        for(int k=0; k<FFTLEN/2-2; k++)
                tb->test(0.0,0.0,0.0,0.0);
 
        // 77. And it's imaginary counterpart
        //      Much roundoff error, as in last test
        tb->test(0.0,0.0,0.0,0.0);
        tb->test(0.0, 0.0, 0.0, 16384.0);
        for(int k=0; k<FFTLEN/2-2; k++)
                tb->test(0.0,0.0,0.0,0.0);
 
 
        // 78. Now let's try some exponentials
        for(int k=0; k<FFTLEN/2; k++) {
                double cl, cr, sl, sr, W;
                W = - 2.0 * M_PI / FFTLEN;
                cl = cos(W * (2*k  )) * 16383.0;
                sl = sin(W * (2*k  )) * 16383.0;
                cr = cos(W * (2*k+1)) * 16383.0;
                sr = sin(W * (2*k+1)) * 16383.0;
                tb->test(cl, sl, cr, sr);
        }
 
        // 79.
        for(int k=0; k<FFTLEN/2; k++) {
                double cl, cr, sl, sr, W;
                W = - 2.0 * M_PI / FFTLEN * 5;
                cl = cos(W * (2*k  )) * 16383.0;
                sl = sin(W * (2*k  )) * 16383.0;
                cr = cos(W * (2*k+1)) * 16383.0;
                sr = sin(W * (2*k+1)) * 16383.0;
                tb->test(cl, sl, cr, sr);
        }
 
        // 80.
        for(int k=0; k<FFTLEN/2; k++) {
                double cl, cr, sl, sr, W;
                W = - 2.0 * M_PI / FFTLEN * 8;
                cl = cos(W * (2*k  )) * 8190.0;
                sl = sin(W * (2*k  )) * 8190.0;
                cr = cos(W * (2*k+1)) * 8190.0;
                sr = sin(W * (2*k+1)) * 8190.0;
                tb->test(cl, sl, cr, sr);
        }
 
        // 81.
        for(int k=0; k<FFTLEN/2; k++) {
                double cl, cr, sl, sr, W;
                W = - 2.0 * M_PI / FFTLEN * 25;
                cl = cos(W * (2*k  )) * 4.0;
                sl = sin(W * (2*k  )) * 4.0;
                cr = cos(W * (2*k+1)) * 4.0;
                sr = sin(W * (2*k+1)) * 4.0;
                tb->test(cl, sl, cr, sr);
        }
 
        // 19.--24. And finally, let's clear out our results / buffer
        for(int k=0; k<(FFTLEN/2) * 5; k++)
                tb->test(0.0,0.0,0.0,0.0);
 
        fclose(fpout);
}
 
 

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[/] [dblclockfft/] [trunk/] [bench/] [cpp/] [ifft_tb.cpp] - Blame information for rev 23

Line No.	Rev	Author	Line
1	14	dgisselq	`//`
2			`// Filename: ifft_tb.cpp`
3			`//`
4			`// Project: A Doubletime Pipelined FFT`
5			`//`
6			`// Purpose: A test-bench for the combined work of both fftmain.v and`
7			`// ifftmain.v. If they work together, in concert like they should,`
8			`// then the operation of both in series should yield an identity.`
9			`// This program attempts to check that identity with various`
10			`// inputs given to it.`
11			`//`
12			`// This file has a variety of dependencies, not the least of which`
13			`// are verilator, ifftmain.v and fftmain.v (both produced by`
14			`// fftgen), but also on the ifft_tb.v verilog test bench found`
15			`// within this directory.`
16			`//`
17			`// Creator: Dan Gisselquist, Ph.D.`
18			`// Gisselquist Tecnology, LLC`
19			`//`
20			`///////////////////////////////////////////////////////////////////////////`
21			`//`
22			`// Copyright (C) 2015, Gisselquist Technology, LLC`
23			`//`
24			`// This program is free software (firmware): you can redistribute it and/or`
25			`// modify it under the terms of the GNU General Public License as published`
26			`// by the Free Software Foundation, either version 3 of the License, or (at`
27			`// your option) any later version.`
28			`//`
29			`// This program is distributed in the hope that it will be useful, but WITHOUT`
30			`// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or`
31			`// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License`
32			`// for more details.`
33			`//`
34			`// You should have received a copy of the GNU General Public License along`
35			`// with this program. (It's in the $(ROOT)/doc directory, run make with no`
36			`// target there if the PDF file isn't present.) If not, see`
37			`// <http://www.gnu.org/licenses/> for a copy.`
38			`//`
39			`// License: GPL, v3, as defined and found on www.gnu.org,`
40			`// http://www.gnu.org/licenses/gpl.html`
41			`//`
42			`//`
43			`///////////////////////////////////////////////////////////////////////////`
44			`#include <stdio.h>`
45			`#include <math.h>`
46			`#include <assert.h>`
47
48			`#include "verilated.h"`
49			`#include "Vifft_tb.h"`
50	23	dgisselq	`#include "twoc.h"`
51	14	dgisselq
52			`#define LGWIDTH 11`
53			`#define IWIDTH 16`
54			`#define MWIDTH 22`
55			`#define OWIDTH 28`
56
57			`#define FFTLEN (1<<LGWIDTH)`
58
59			`class IFFT_TB {`
60			`public:`
61			`Vifft_tb *m_tb;`
62			`unsigned int m_log[8*FFTLEN];`
63			`long m_data[2*FFTLEN];`
64			`int m_iaddr, m_oaddr, m_offset;`
65			`FILE *m_dumpfp;`
66			`// double *m_tb_buf;`
67			`// int m_ntest;`
68			`bool m_syncd;`
69
70			`IFFT_TB(void) {`
71			`m_tb = new Vifft_tb;`
72			`m_iaddr = m_oaddr = 0;`
73			`m_dumpfp = NULL;`
74
75			`m_syncd = false;`
76			`// m_ntest = 0;`
77			`}`
78
79			`void tick(void) {`
80			`m_tb->i_clk = 0;`
81			`m_tb->eval();`
82			`m_tb->i_clk = 1;`
83			`m_tb->eval();`
84			`}`
85
86			`void reset(void) {`
87			`m_tb->i_ce = 0;`
88			`m_tb->i_rst = 1;`
89			`tick();`
90			`m_tb->i_rst = 0;`
91			`tick();`
92
93			`m_iaddr = m_oaddr = 0;`
94			`m_syncd = false;`
95			`}`
96
97			`long twos_complement(const long val, const int bits) {`
98	23	dgisselq	`return sbits(val, bits);`
99	14	dgisselq	`}`
100
101			`void checkresults(void) {`
102			`/*`
103			`double dp, sp; // Complex array`
104			`double vout[FFTLEN*2];`
105			`double isq=0.0, osq = 0.0;`
106			`long *lp;`
107
108			`// Fill up our test array from the log array`
109			`printf("%3d : CHECK: %8d %5x\n", m_ntest, m_iaddr, m_iaddr);`
110			`dp = m_tb_buf; lp = &m_log[(m_iaddr-FFTLEN3)&((4FFTLEN-1)&(-FFTLEN))];`
111			`for(int i=0; i<FFTLEN; i++) {`
112			`long tv = *lp++;`
113
114			`dp[0] = twos_complement(tv >> IWIDTH, IWIDTH);`
115			`dp[1] = twos_complement(tv, IWIDTH);`
116
117			`printf("IN[%4d = %4x] = %9.1f %9.1f\n",`
118			`i+((m_iaddr-FFTLEN3)&((4FFTLEN-1)&(-FFTLEN))),`
119			`i+((m_iaddr-FFTLEN3)&((4FFTLEN-1)&(-FFTLEN))),`
120			`dp[0], dp[1]);`
121			`dp += 2;`
122			`}`
123
124			`// Let's measure ... are we the zero vector? If not, how close?`
125			`dp = m_tb_buf;`
126			`for(int i=0; i<FFTLEN; i++)`
127			`isq += (dp) (*dp);`
128
129			`fftw_execute(m_plan);`
130
131			`// Let's load up the output we received into vout`
132			`dp = vout;`
133			`for(int i=0; i<FFTLEN; i++) {`
134			`long tv = m_data[i];`
135
136			`printf("OUT[%4d = %4x] = ", i, i);`
137			`printf("%16lx = ", tv);`
138			`*dp = twos_complement(tv >> OWIDTH, OWIDTH);`
139			`printf("%12.1f + ", *dp);`
140			`osq += (dp) (*dp); dp++;`
141			`*dp = twos_complement(tv, OWIDTH);`
142			`printf("%12.1f j", *dp);`
143			`osq += (dp) (*dp); dp++;`
144			`printf(" <-> %12.1f %12.1f\n", m_tb_buf[2i], m_fft_buf[2i+1]);`
145			`}`
146
147
148			`// Let's figure out if there's a scale factor difference ...`
149			`double scale = 0.0, wt = 0.0;`
150			`sp = m_tb_buf; dp = vout;`
151			`for(int i=0; i<FFTLEN*2; i++) {`
152			`scale += (sp) (*dp++);`
153			`wt += (sp) (*sp); sp++;`
154			`} scale = scale / wt;`
155
156			`if (wt == 0.0) scale = 1.0;`
157
158			`double xisq = 0.0;`
159			`sp = m_tb_buf; dp = vout;`
160			`for(int i=0; i<FFTLEN*2; i++) {`
161			`double vl = (sp++) scale - (*dp++);`
162			`xisq += vl * vl;`
163			`}`
164
165			`printf("%3d : SCALE = %12.6f, WT = %18.1f, ISQ = %15.1f, ",`
166			`m_ntest, scale, wt, isq);`
167			`printf("OSQ = %18.1f, ", osq);`
168			`printf("XISQ = %18.1f\n", xisq);`
169			`m_ntest++;`
170			`*/`
171			`}`
172
173			`bool test(int lft, int rht) {`
174			`m_tb->i_ce = 1;`
175			`m_tb->i_rst = 0;`
176			`m_tb->i_left = lft;`
177			`m_tb->i_right = rht;`
178
179			`m_log[(m_iaddr++)&(8*FFTLEN-1)] = lft;`
180			`m_log[(m_iaddr++)&(8*FFTLEN-1)] = rht;`
181
182			`tick();`
183
184			`if ((m_tb->o_sync)&&(!m_syncd)) {`
185			`m_offset = m_iaddr;`
186			`m_oaddr = 0;`
187			`m_syncd = true;`
188			`}`
189
190			`m_data[(m_oaddr++)&(FFTLEN-1)] = m_tb->o_left;`
191			`m_data[(m_oaddr++)&(FFTLEN-1)] = m_tb->o_right;`
192
193			`if ((m_syncd)&&((m_oaddr&(FFTLEN-1)) == 0)) {`
194			`dumpwrite();`
195			`// checkresults();`
196			`}`
197
198			`return (m_tb->o_sync);`
199			`}`
200
201			`bool test(double lft_r, double lft_i, double rht_r, double rht_i) {`
202			`int ilft, irht, ilft_r, ilft_i, irht_r, irht_i;`
203
204			`assert(2*IWIDTH <= 32);`
205			`ilft_r = (int)(lft_r) & ((1<<IWIDTH)-1);`
206			`ilft_i = (int)(lft_i) & ((1<<IWIDTH)-1);`
207			`irht_r = (int)(rht_r) & ((1<<IWIDTH)-1);`
208			`irht_i = (int)(rht_i) & ((1<<IWIDTH)-1);`
209
210			`ilft = (ilft_r << IWIDTH) \| ilft_i;`
211			`irht = (irht_r << IWIDTH) \| irht_i;`
212
213			`return test(ilft, irht);`
214			`}`
215
216			`double rdata(int addr) {`
217			`long ivl = m_data[addr & (FFTLEN-1)];`
218
219			`ivl = twos_complement(ivl >> OWIDTH, OWIDTH);`
220			`return (double)ivl;`
221			`}`
222
223			`double idata(int addr) {`
224			`long ivl = m_data[addr & (FFTLEN-1)];`
225
226			`ivl = twos_complement(ivl, OWIDTH);`
227			`return (double)ivl;`
228			`}`
229
230			`void dump(FILE *fp) {`
231			`m_dumpfp = fp;`
232			`}`
233
234			`void dumpwrite(void) {`
235			`if (!m_dumpfp)`
236			`return;`
237
238			`double *buf;`
239
240			`buf = new double[FFTLEN * 2];`
241			`for(int i=0; i<FFTLEN; i++) {`
242			`buf[i*2] = rdata(i);`
243			`buf[i*2+1] = idata(i);`
244			`}`
245
246			`fwrite(buf, sizeof(double), FFTLEN*2, m_dumpfp);`
247			`delete[] buf;`
248			`}`
249			`};`
250
251
252			`int main(int argc, char argv, char envp) {`
253			`Verilated::commandArgs(argc, argv);`
254			`IFFT_TB *tb = new IFFT_TB;`
255			`FILE *fpout;`
256
257			`fpout = fopen("ifft_tb.dbl", "w");`
258			`if (NULL == fpout) {`
259			`fprintf(stderr, "Cannot write output file, fft_tb.dbl\n");`
260			`exit(-1);`
261			`}`
262
263			`tb->reset();`
264			`tb->dump(fpout);`
265
266			`// 1 -> 0x0001`
267			`// 2 -> 0x0002`
268			`// 4 -> 0x0004`
269			`// 8 -> 0x0008`
270			`// 16 -> 0x0010`
271			`// 32 -> 0x0020`
272			`// 64 -> 0x0040`
273			`// 128 -> 0x0080`
274			`// 256 -> 0x0100`
275			`// 512 -> 0x0200`
276			`// 1024 -> 0x0400`
277			`// 2048 -> 0x0800`
278			`// 4096 -> 0x1000`
279			`// 8192 -> 0x2000`
280			`// 16384 -> 0x4000`
281			`for(int v=1; v<32768; v<<=1) for(int k=0; k<FFTLEN/2; k++)`
282			`tb->test((double)v,0.0,(double)v,0.0);`
283			`// 1 -> 0xffff`
284			`// 2 -> 0xfffe`
285			`// 4 -> 0xfffc`
286			`// 8 -> 0xfff8`
287			`// 16 -> 0xfff0`
288			`// 32 -> 0xffe0`
289			`// 64 -> 0xffc0`
290			`// 128 -> 0xff80`
291			`// 256 -> 0xff00`
292			`// 512 -> 0xfe00`
293			`// 1024 -> 0xfc00`
294			`// 2048 -> 0xf800`
295			`// 4096 -> 0xf000`
296			`// 8192 -> 0xe000`
297			`// 16384 -> 0xc000`
298			`// 32768 -> 0x8000`
299			`for(int v=1; v<=32768; v<<=1) for(int k=0; k<FFTLEN/2; k++)`
300			`tb->test(-(double)v,0.0,-(double)v,0.0);`
301			`// 1 -> 0x000040 CORRECT!!`
302			`// 2 -> 0x000080`
303			`// 4 -> 0x000100`
304			`// 8 -> 0x000200`
305			`// 16 -> 0x000400`
306			`// 32 -> 0x000800`
307			`// 64 -> 0x001000`
308			`// 128 -> 0x002000`
309			`// 256 -> 0x004000`
310			`// 512 -> 0x008000`
311			`// 1024 -> 0x010000`
312			`// 2048 -> 0x020000`
313			`// 4096 -> 0x040000`
314			`// 8192 -> 0x080000`
315			`// 16384 -> 0x100000`
316			`for(int v=1; v<32768; v<<=1) for(int k=0; k<FFTLEN/2; k++)`
317			`tb->test(0.0,(double)v,0.0,(double)v);`
318			`// 1 -> 0x3fffc0`
319			`// 2 -> 0x3fff80`
320			`// 4 -> 0x3fff00`
321			`// 8 -> 0x3ffe00`
322			`// 16 -> 0x3ffc00`
323			`// 32 -> 0x3ff800`
324			`// 64 -> 0x3ff000`
325			`// 128 -> 0x3fe000`
326			`// 256 -> 0x3fc000`
327			`// 512 -> 0x3f8000`
328			`// 1024 -> 0x3f0000`
329			`// 2048 -> 0x3e0000`
330			`// 4096 -> 0x3c0000`
331			`// 8192 -> 0x380000`
332			`// 16384 -> 0x300000`
333			`for(int v=1; v<32768; v<<=1) for(int k=0; k<FFTLEN/2; k++)`
334			`tb->test(0.0,-(double)v,0.0,-(double)v);`
335
336			`// 61. Now, how about the smallest alternating real signal`
337			`for(int k=0; k<FFTLEN/2; k++)`
338			`tb->test(2.0,0.0,0.0,0.0); // Don't forget to expect a bias!`
339			`// 62. Now, how about the smallest alternating imaginary signal`
340			`for(int k=0; k<FFTLEN/2; k++)`
341			`tb->test(0.0,2.0,0.0,0.0); // Don't forget to expect a bias!`
342			`// 63. Now, how about the smallest alternating real signal,2nd phase`
343			`for(int k=0; k<FFTLEN/2; k++)`
344			`tb->test(0.0,0.0,2.0,0.0); // Don't forget to expect a bias!`
345			`// 64.Now, how about the smallest alternating imaginary signal,2nd phase`
346			`for(int k=0; k<FFTLEN/2; k++)`
347			`tb->test(0.0,0.0,0.0,2.0); // Don't forget to expect a bias!`
348
349			`// 65.`
350			`for(int k=0; k<FFTLEN/2; k++)`
351			`tb->test(32767.0,0.0,-32767.0,0.0);`
352			`// 66.`
353			`for(int k=0; k<FFTLEN/2; k++)`
354			`tb->test(0.0,-32767.0,0.0,32767.0);`
355			`// 67.`
356			`for(int k=0; k<FFTLEN/2; k++)`
357			`tb->test(-32768.0,-32768.0,-32768.0,-32768.0);`
358			`// 68.`
359			`for(int k=0; k<FFTLEN/2; k++)`
360			`tb->test(0.0,-32767.0,0.0,32767.0);`
361			`// 69.`
362			`for(int k=0; k<FFTLEN/2; k++)`
363			`tb->test(0.0,32767.0,0.0,-32767.0);`
364			`// 70.`
365			`for(int k=0; k<FFTLEN/2; k++)`
366			`tb->test(-32768.0,-32768.0,-32768.0,-32768.0);`
367
368			`// 71. Now let's go for an impulse (SUCCESS)`
369			`tb->test(16384.0, 0.0, 0.0, 0.0);`
370			`for(int k=0; k<FFTLEN/2-1; k++)`
371			`tb->test(0.0,0.0,0.0,0.0);`
372
373			`// 72. And another one on the next clock (FAILS, ugly)`
374			`// Lot's of roundoff error, or some error in small bits`
375			`tb->test(0.0, 0.0, 16384.0, 0.0);`
376			`for(int k=0; k<FFTLEN/2-1; k++)`
377			`tb->test(0.0,0.0,0.0,0.0);`
378
379			`// 73. And an imaginary one on the second clock`
380			`// Much roundoff error, as in last test`
381			`tb->test(0.0, 0.0, 0.0, 16384.0);`
382			`for(int k=0; k<FFTLEN/2-1; k++)`
383			`tb->test(0.0,0.0,0.0,0.0);`
384
385			`// 74. Likewise the next clock`
386			`// Much roundoff error, as in last test`
387			`tb->test(0.0,0.0,0.0,0.0);`
388			`tb->test(16384.0, 0.0, 0.0, 0.0);`
389			`for(int k=0; k<FFTLEN/2-2; k++)`
390			`tb->test(0.0,0.0,0.0,0.0);`
391
392			`// 75. And it's imaginary counterpart`
393			`// Much roundoff error, as in last test`
394			`tb->test(0.0,0.0,0.0,0.0);`
395			`tb->test(0.0, 16384.0, 0.0, 0.0);`
396			`for(int k=0; k<FFTLEN/2-2; k++)`
397			`tb->test(0.0,0.0,0.0,0.0);`
398
399			`// 76. Likewise the next clock`
400			`// Much roundoff error, as in last test`
401			`tb->test(0.0,0.0,0.0,0.0);`
402			`tb->test(0.0, 0.0, 16384.0, 0.0);`
403			`for(int k=0; k<FFTLEN/2-2; k++)`
404			`tb->test(0.0,0.0,0.0,0.0);`
405
406			`// 77. And it's imaginary counterpart`
407			`// Much roundoff error, as in last test`
408			`tb->test(0.0,0.0,0.0,0.0);`
409			`tb->test(0.0, 0.0, 0.0, 16384.0);`
410			`for(int k=0; k<FFTLEN/2-2; k++)`
411			`tb->test(0.0,0.0,0.0,0.0);`
412
413
414			`// 78. Now let's try some exponentials`
415			`for(int k=0; k<FFTLEN/2; k++) {`
416			`double cl, cr, sl, sr, W;`
417			`W = - 2.0 * M_PI / FFTLEN;`
418			`cl = cos(W * (2k )) 16383.0;`
419			`sl = sin(W * (2k )) 16383.0;`
420			`cr = cos(W * (2k+1)) 16383.0;`
421			`sr = sin(W * (2k+1)) 16383.0;`
422			`tb->test(cl, sl, cr, sr);`
423			`}`
424
425			`// 79.`
426			`for(int k=0; k<FFTLEN/2; k++) {`
427			`double cl, cr, sl, sr, W;`
428			`W = - 2.0 * M_PI / FFTLEN * 5;`
429			`cl = cos(W * (2k )) 16383.0;`
430			`sl = sin(W * (2k )) 16383.0;`
431			`cr = cos(W * (2k+1)) 16383.0;`
432			`sr = sin(W * (2k+1)) 16383.0;`
433			`tb->test(cl, sl, cr, sr);`
434			`}`
435
436			`// 80.`
437			`for(int k=0; k<FFTLEN/2; k++) {`
438			`double cl, cr, sl, sr, W;`
439			`W = - 2.0 * M_PI / FFTLEN * 8;`
440			`cl = cos(W * (2k )) 8190.0;`
441			`sl = sin(W * (2k )) 8190.0;`
442			`cr = cos(W * (2k+1)) 8190.0;`
443			`sr = sin(W * (2k+1)) 8190.0;`
444			`tb->test(cl, sl, cr, sr);`
445			`}`
446
447			`// 81.`
448			`for(int k=0; k<FFTLEN/2; k++) {`
449			`double cl, cr, sl, sr, W;`
450			`W = - 2.0 * M_PI / FFTLEN * 25;`
451			`cl = cos(W * (2k )) 4.0;`
452			`sl = sin(W * (2k )) 4.0;`
453			`cr = cos(W * (2k+1)) 4.0;`
454			`sr = sin(W * (2k+1)) 4.0;`
455			`tb->test(cl, sl, cr, sr);`
456			`}`
457
458			`// 19.--24. And finally, let's clear out our results / buffer`
459			`for(int k=0; k<(FFTLEN/2) * 5; k++)`
460			`tb->test(0.0,0.0,0.0,0.0);`
461
462			`fclose(fpout);`
463			`}`
464
465