香水城：帮忙解释下STM32 FFT 取模的函数

发表于 2009-8-5 11:33

能解释下取模的函数吗？

void powerMag(long nfill, char* strPara)
{
  int32_t lX,lY;
  uint32_t i;

  for (i=0; i < nfill; i++)
  {
lX= (lBUFOUT<<16)>>16; /* sine_cosine --> cos */
lY= (lBUFOUT >> 16); /* sine_cosine --> sin */
{
   float X=  64*((float)lX)/32768;
   float Y = 64*((float)lY)/32768;
   float Mag = sqrt(X*X+ Y*Y)/nfill;
   lBUFMAG = (uint32_t)(Mag*65536);
}
  }
  if (strPara == "1SIDED") onesided(nfill);
}

发表于 2009-8-5 12:29

哪里来得函数？

C程序我能看懂，不懂FFT算法。

发表于 2009-8-6 22:08

/******************** (C) COPYRIGHT 2009  STMicroelectronics ********************
* File Name       : cr4_fft_1024_stm32.s
* Author          : MCD Application Team
;* Version          : V2.0.0
;* Date             : 04/27/2009
* Description       : Optimized 1024-point radix-4 complex FFT for Cortex-M3
********************************************************************************
* THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
* WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE TIME.
* AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY DIRECT,
* INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING FROM THE
* CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE BY CUSTOMERS OF THE CODING
* INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
*******************************************************************************/

#define pssK    R0
#define pssOUT R0
#define pssX    R1
#define pssIN    R1
#define butternbr R2
#define Nbin    R2
#define index    R3
#define Ar       R4
#define Ai       R5
#define Br       R6
#define Bi       R7
#define Cr       R8
#define Ci       R9
#define Dr       R10
#define Di       R11
#define cntrbitrev R12
#define tmp    R12
#define pssIN2 R14
#define tmp2    R14
#define NPT    1024

/*---------------------------- MACROS ----------------------------------------*/
DEC    MACRO reg
      SUB  reg,reg,#1
      ENDM

INC    MACRO reg
      ADD  reg,reg,#1
      ENDM

QUAD MACRO reg
      MOV  reg,reg,LSL#2
      ENDM

/*sXi = *(PssX+1); sXr = *PssX; PssX += offset; PssX= R1*/
LDR2Q MACRO sXr,sXi, PssX, offset
      LDRSH sXi, [PssX, #2]
      LDRSH sXr, [PssX]
      ADD PssX, PssX, offset
      ENDM

/*!! Same macro, to be used when passing negative offset value !!*/
LDR2Qm  MACRO sXr,sXi, PssX, offset
      LDRSH sXi, [PssX, #2]
      LDRSH sXr, [PssX]
      SUB PssX, PssX, offset
      ENDM

/*(PssX+1)= sXi;  *PssX=sXr; PssX += offset */
STR2Q MACRO sXr,sXi,PssX, offset
      STRH  sXi, [PssX, #2]
      STRH  sXr, [PssX]
      ADD PssX, PssX, offset
      ENDM

/* YY = Cplx_conjugate_mul(Y,K)
Y = YYr + i*YYi
use the following trick
K = (Kr-Ki) + i*Ki */
CXMUL_V7 MACRO YYr, YYi, Yr, Yi, Kr, Ki,tmp,tmp2
      SUB  tmp2, Yi, Yr       /* sYi-sYr */
      MUL  tmp, tmp2, Ki       /* (sYi-sYr)*sKi */
      ADD  tmp2, Kr, Ki, LSL#1  /* (sKr+sKi) */
      MLA  YYi, Yi, Kr, tmp    /* lYYi = sYi*sKr-sYr*sKi */
      MLA  YYr, Yr, tmp2, tmp /* lYYr = sYr*sKr+sYi*sKi */
      ENDM

/* Four point complex Fast Fourier Transform */
CXADDA4  MACRO s
      /* (C,D) = (C+D, C-D) */
      ADD    Cr, Cr, Dr
      ADD    Ci, Ci, Di
      SUB    Dr, Cr, Dr, LSL#1
      SUB    Di, Ci, Di, LSL#1
      /* (A,B) = (A+(B>>s), A-(B>>s))/4 */
      MOV    Ar, Ar, ASR#2
      MOV    Ai, Ai, ASR#2
      ADD    Ar, Ar, Br, ASR#(2+s)
      ADD    Ai, Ai, Bi, ASR#(2+s)
      SUB    Br, Ar, Br, ASR#(1+s)
      SUB    Bi, Ai, Bi, ASR#(1+s)
      /* (A,C) = (A+(C>>s)/4, A-(C>>s)/4) */
      ADD    Ar, Ar, Cr, ASR#(2+s)
      ADD    Ai, Ai, Ci, ASR#(2+s)
      SUB    Cr, Ar, Cr, ASR#(1+s)
      SUB    Ci, Ai, Ci, ASR#(1+s)
      /* (B,D) = (B-i*(D>>s)/4, B+i*(D>>s)/4) */
      ADD    Br, Br, Di, ASR#(2+s)
      SUB    Bi, Bi, Dr, ASR#(2+s)
      SUB    Di, Br, Di, ASR#(1+s)
      ADD    Dr, Bi, Dr, ASR#(1+s)
      ENDM

BUTFLY4ZERO_OPT  MACRO pIN,offset, pOUT
      LDRSH Ai, [pIN, #2]
      LDRSH Ar, [pIN]
ADD pIN, pIN, #NPT
      LDRSH Ci, [pIN, #2]
      LDRSH Cr, [pIN]
      ADD pIN, pIN, #NPT
      LDRSH Bi, [pIN, #2]
      LDRSH Br, [pIN]
      ADD pIN, pIN, #NPT
      LDRSH Di, [pIN, #2]
      LDRSH Dr, [pIN]
      ADD pIN, pIN, #NPT

      /* (C,D) = (C+D, C-D) */
      ADD    Cr, Cr, Dr
      ADD    Ci, Ci, Di
      SUB    Dr, Cr, Dr, LSL#1  /* trick */
      SUB    Di, Ci, Di, LSL#1  /* trick */
      /* (A,B) = (A+B)/4, (A-B)/4 */
      MOV    Ar, Ar, ASR#2
      MOV    Ai, Ai, ASR#2
      ADD    Ar, Ar, Br, ASR#2
      ADD    Ai, Ai, Bi, ASR#2
      SUB    Br, Ar, Br, ASR#1
      SUB    Bi, Ai, Bi, ASR#1
      /* (A,C) = (A+C)/4, (A-C)/4 */
      ADD    Ar, Ar, Cr, ASR#2
      ADD    Ai, Ai, Ci, ASR#2
      SUB    Cr, Ar, Cr, ASR#1
      SUB    Ci, Ai, Ci, ASR#1
      /* (B,D) = (B-i*D)/4, (B+i*D)/4 */
      ADD    Br, Br, Di, ASR#2
      SUB    Bi, Bi, Dr, ASR#2
      SUB    Di, Br, Di, ASR#1
      ADD    Dr, Bi, Dr, ASR#1

      STRH Ai, [pOUT, #2]
      STRH Ar, [pOUT], #4
      STRH Bi, [pOUT, #2]
      STRH Br, [pOUT], #4
      STRH Ci, [pOUT, #2]
      STRH Cr, [pOUT], #4
      STRH Dr, [pOUT, #2]  /* inversion here */
      STRH Di, [pOUT], #4
      ENDM

BUTFLY4_V7  MACRO pssDin,offset,pssDout,qformat,pssK
      LDR2Qm Ar,Ai,pssDin, -offset
      LDR2Q Dr,Di,pssK, #4
      /* format CXMUL_V7 YYr, YYi, Yr, Yi, Kr, Ki,tmp,tmp2 */
      CXMUL_V7 Dr,Di,Ar,Ai,Dr,Di,tmp,tmp2
      LDR2Qm Ar,Ai,pssDin,-offset
      LDR2Q Cr,Ci,pssK,#4
      CXMUL_V7 Cr,Ci,Ar,Ai,Cr,Ci,tmp,tmp2
      LDR2Qm Ar,Ai, pssDin, -offset
      LDR2Q Br,Bi, pssK, #4
      CXMUL_V7  Br,Bi,Ar,Ai,Br,Bi,tmp,tmp2
      LDR2Q Ar,Ai, pssDin, #0
      CXADDA4  qformat
      STRH Ai, [pssDout, #2]
      STRH Ar, [pssDout]
      ADD    pssDout, pssDout, offset
      STRH Bi, [pssDout, #2]
      STRH Br, [pssDout]
      ADD    pssDout, pssDout, offset
      STRH Ci, [pssDout, #2]
      STRH Cr, [pssDout]
      ADD    pssDout, pssDout, offset
      STRH Dr, [pssDout, #2]  /* inversion here */
      STRH Di, [pssDout], #4
      ENDM

/*---------------------------- CODE ------------------------------------------*/
/*============================================================================*/
      MODULE FFT_CORTEXM3
      PUBLIC cr4_fft_1024_stm32
      EXTERN TableFFT
      SECTION .text:CODE(2)

/*******************************************************************************
* Function Name  : cr4_fft_1024_stm32
* Description : complex radix-4 1024 points FFT
* Input       : - R0 = pssOUT: Output array .
*                - R1 = pssIN: Input array
*                - R2 = Nbin: =1024 number of points, this optimized FFT
*                   function can only convert 1024-points.
* Output       : None
* Return       : None
*******************************************************************************/
cr4_fft_1024_stm32

      STMFD SP!, {R4-R11, LR}

      MOV cntrbitrev, #0
      MOV index,#0

preloop_v7
      ADD    pssIN2, pssIN, cntrbitrev, LSR#22 /*1024-pts*/
      BUTFLY4ZERO_OPT pssIN2,Nbin,pssOUT
      INC index
      RBIT cntrbitrev,index
      CMP index,#256  /* 1024-pts */
      BNE  preloop_v7

      SUB    pssX, pssOUT, Nbin, LSL#2
      MOV    index, #16
      MOVS butternbr, Nbin, LSR#4 /*dual use of register */

发表于 2009-8-6 22:09

/*------------------------------------------------------------------------------
The FFT coefficients table can be stored into Flash or RAM.
The following two lines of code allow selecting the method for coefficients
storage.
In the case of choosing coefficients in RAM, you have to:
1. Include the file table_fft.h, which is a part of the DSP library,
   in your main file.
2. Decomment the line LDR.W pssK, =TableFFT and comment the line
   ADRL pssK, TableFFT_V7
3. Comment all the TableFFT_V7 data.
------------------------------------------------------------------------------*/
      ADRL pssK, TableFFT_V7 /* Coeff in Flash */
      //LDR.W pssK, =TableFFT    /* Coeff in RAM */

/*................................*/
passloop_v7
      STMFD SP!, {pssX,butternbr}
      ADD    tmp, index, index, LSL#1
      ADD    pssX, pssX, tmp
      SUB    butternbr, butternbr, #1<<16
/*................*/
grouploop_v7
      ADD    butternbr,butternbr,index,LSL#(16-2)
/*.......*/
butterloop_v7
      BUTFLY4_V7  pssX,index,pssX,14,pssK
      SUBS       butternbr,butternbr, #1<<16
      BGE    butterloop_v7
/*.......*/
      ADD    tmp, index, index, LSL#1
      ADD    pssX, pssX, tmp
      DEC    butternbr
      MOVS tmp2, butternbr, LSL#16
      IT    NE
      SUBNE pssK, pssK, tmp
      BNE    grouploop_v7
/*................*/
      LDMFD sp!, {pssX, butternbr}
      QUAD index
      MOVS butternbr, butternbr, LSR#2 /* loop nbr /= radix */
      BNE    passloop_v7
/*................................*/
   LDMFD SP!, {R4-R11, PC}

/*============================================================================*/

      DATA

TableFFT_V7
      // N=16
      DC16 0x4000,0x0000, 0x4000,0x0000, 0x4000,0x0000
      DC16 0xdd5d,0x3b21, 0x22a3,0x187e, 0x0000,0x2d41
      DC16 0xa57e,0x2d41, 0x0000,0x2d41, 0xc000,0x4000
      DC16 0xdd5d,0xe782, 0xdd5d,0x3b21, 0xa57e,0x2d41
      // N=64
      DC16 0x4000,0x0000, 0x4000,0x0000, 0x4000,0x0000
      DC16 0x2aaa,0x1294, 0x396b,0x0646, 0x3249,0x0c7c
      DC16 0x11a8,0x238e, 0x3249,0x0c7c, 0x22a3,0x187e
      DC16 0xf721,0x3179, 0x2aaa,0x1294, 0x11a8,0x238e
      DC16 0xdd5d,0x3b21, 0x22a3,0x187e, 0x0000,0x2d41
      DC16 0xc695,0x3fb1, 0x1a46,0x1e2b, 0xee58,0x3537
      DC16 0xb4be,0x3ec5, 0x11a8,0x238e, 0xdd5d,0x3b21
      DC16 0xa963,0x3871, 0x08df,0x289a, 0xcdb7,0x3ec5
      DC16 0xa57e,0x2d41, 0x0000,0x2d41, 0xc000,0x4000
      DC16 0xa963,0x1e2b, 0xf721,0x3179, 0xb4be,0x3ec5
      DC16 0xb4be,0x0c7c, 0xee58,0x3537, 0xac61,0x3b21
      DC16 0xc695,0xf9ba, 0xe5ba,0x3871, 0xa73b,0x3537
      DC16 0xdd5d,0xe782, 0xdd5d,0x3b21, 0xa57e,0x2d41
      DC16 0xf721,0xd766, 0xd556,0x3d3f, 0xa73b,0x238e
      DC16 0x11a8,0xcac9, 0xcdb7,0x3ec5, 0xac61,0x187e
      DC16 0x2aaa,0xc2c1, 0xc695,0x3fb1, 0xb4be,0x0c7c
      // N=256
      DC16 0x4000,0x0000, 0x4000,0x0000, 0x4000,0x0000
      DC16 0x3b1e,0x04b5, 0x3e69,0x0192, 0x3cc8,0x0324
      DC16 0x35eb,0x0964, 0x3cc8,0x0324, 0x396b,0x0646
      DC16 0x306c,0x0e06, 0x3b1e,0x04b5, 0x35eb,0x0964
      DC16 0x2aaa,0x1294, 0x396b,0x0646, 0x3249,0x0c7c
      DC16 0x24ae,0x1709, 0x37af,0x07d6, 0x2e88,0x0f8d
      DC16 0x1e7e,0x1b5d, 0x35eb,0x0964, 0x2aaa,0x1294
      DC16 0x1824,0x1f8c, 0x341e,0x0af1, 0x26b3,0x1590
      DC16 0x11a8,0x238e, 0x3249,0x0c7c, 0x22a3,0x187e
      DC16 0x0b14,0x2760, 0x306c,0x0e06, 0x1e7e,0x1b5d
      DC16 0x0471,0x2afb, 0x2e88,0x0f8d, 0x1a46,0x1e2b
      DC16 0xfdc7,0x2e5a, 0x2c9d,0x1112, 0x15fe,0x20e7
      DC16 0xf721,0x3179, 0x2aaa,0x1294, 0x11a8,0x238e
      DC16 0xf087,0x3453, 0x28b2,0x1413, 0x0d48,0x2620
      DC16 0xea02,0x36e5, 0x26b3,0x1590, 0x08df,0x289a
      DC16 0xe39c,0x392b, 0x24ae,0x1709, 0x0471,0x2afb
      DC16 0xdd5d,0x3b21, 0x22a3,0x187e, 0x0000,0x2d41
      DC16 0xd74e,0x3cc5, 0x2093,0x19ef, 0xfb8f,0x2f6c
      DC16 0xd178,0x3e15, 0x1e7e,0x1b5d, 0xf721,0x3179
      DC16 0xcbe2,0x3f0f, 0x1c64,0x1cc6, 0xf2b8,0x3368
      DC16 0xc695,0x3fb1, 0x1a46,0x1e2b, 0xee58,0x3537
      DC16 0xc197,0x3ffb, 0x1824,0x1f8c, 0xea02,0x36e5
      DC16 0xbcf0,0x3fec, 0x15fe,0x20e7, 0xe5ba,0x3871
      DC16 0xb8a6,0x3f85, 0x13d5,0x223d, 0xe182,0x39db
      DC16 0xb4be,0x3ec5, 0x11a8,0x238e, 0xdd5d,0x3b21
      DC16 0xb140,0x3daf, 0x0f79,0x24da, 0xd94d,0x3c42
      DC16 0xae2e,0x3c42, 0x0d48,0x2620, 0xd556,0x3d3f
      DC16 0xab8e,0x3a82, 0x0b14,0x2760, 0xd178,0x3e15
      DC16 0xa963,0x3871, 0x08df,0x289a, 0xcdb7,0x3ec5
      DC16 0xa7b1,0x3612, 0x06a9,0x29ce, 0xca15,0x3f4f
      DC16 0xa678,0x3368, 0x0471,0x2afb, 0xc695,0x3fb1
      DC16 0xa5bc,0x3076, 0x0239,0x2c21, 0xc338,0x3fec
      DC16 0xa57e,0x2d41, 0x0000,0x2d41, 0xc000,0x4000
      DC16 0xa5bc,0x29ce, 0xfdc7,0x2e5a, 0xbcf0,0x3fec
      DC16 0xa678,0x2620, 0xfb8f,0x2f6c, 0xba09,0x3fb1
      DC16 0xa7b1,0x223d, 0xf957,0x3076, 0xb74d,0x3f4f
      DC16 0xa963,0x1e2b, 0xf721,0x3179, 0xb4be,0x3ec5
      DC16 0xab8e,0x19ef, 0xf4ec,0x3274, 0xb25e,0x3e15
      DC16 0xae2e,0x1590, 0xf2b8,0x3368, 0xb02d,0x3d3f
      DC16 0xb140,0x1112, 0xf087,0x3453, 0xae2e,0x3c42
      DC16 0xb4be,0x0c7c, 0xee58,0x3537, 0xac61,0x3b21
      DC16 0xb8a6,0x07d6, 0xec2b,0x3612, 0xaac8,0x39db
      DC16 0xbcf0,0x0324, 0xea02,0x36e5, 0xa963,0x3871
      DC16 0xc197,0xfe6e, 0xe7dc,0x37b0, 0xa834,0x36e5
      DC16 0xc695,0xf9ba, 0xe5ba,0x3871, 0xa73b,0x3537
      DC16 0xcbe2,0xf50f, 0xe39c,0x392b, 0xa678,0x3368
      DC16 0xd178,0xf073, 0xe182,0x39db, 0xa5ed,0x3179
      DC16 0xd74e,0xebed, 0xdf6d,0x3a82, 0xa599,0x2f6c
      DC16 0xdd5d,0xe782, 0xdd5d,0x3b21, 0xa57e,0x2d41
      DC16 0xe39c,0xe33a, 0xdb52,0x3bb6, 0xa599,0x2afb
      DC16 0xea02,0xdf19, 0xd94d,0x3c42, 0xa5ed,0x289a
      DC16 0xf087,0xdb26, 0xd74e,0x3cc5, 0xa678,0x2620
      DC16 0xf721,0xd766, 0xd556,0x3d3f, 0xa73b,0x238e
      DC16 0xfdc7,0xd3df, 0xd363,0x3daf, 0xa834,0x20e7
      DC16 0x0471,0xd094, 0xd178,0x3e15, 0xa963,0x1e2b
      DC16 0x0b14,0xcd8c, 0xcf94,0x3e72, 0xaac8,0x1b5d
      DC16 0x11a8,0xcac9, 0xcdb7,0x3ec5, 0xac61,0x187e
      DC16 0x1824,0xc850, 0xcbe2,0x3f0f, 0xae2e,0x1590
      DC16 0x1e7e,0xc625, 0xca15,0x3f4f, 0xb02d,0x1294
      DC16 0x24ae,0xc44a, 0xc851,0x3f85, 0xb25e,0x0f8d
      DC16 0x2aaa,0xc2c1, 0xc695,0x3fb1, 0xb4be,0x0c7c
      DC16 0x306c,0xc18e, 0xc4e2,0x3fd4, 0xb74d,0x0964
      DC16 0x35eb,0xc0b1, 0xc338,0x3fec, 0xba09,0x0646
      DC16 0x3b1e,0xc02c, 0xc197,0x3ffb, 0xbcf0,0x0324
      // N=1024
      DC16 0x4000,0x0000, 0x4000,0x0000, 0x4000,0x0000
      DC16 0x3ed0,0x012e, 0x3f9b,0x0065, 0x3f36,0x00c9
      DC16 0x3d9a,0x025b, 0x3f36,0x00c9, 0x3e69,0x0192
      DC16 0x3c5f,0x0388, 0x3ed0,0x012e, 0x3d9a,0x025b
      DC16 0x3b1e,0x04b5, 0x3e69,0x0192, 0x3cc8,0x0324
      DC16 0x39d9,0x05e2, 0x3e02,0x01f7, 0x3bf4,0x03ed
      DC16 0x388e,0x070e, 0x3d9a,0x025b, 0x3b1e,0x04b5
      DC16 0x373f,0x0839, 0x3d31,0x02c0, 0x3a46,0x057e
      DC16 0x35eb,0x0964, 0x3cc8,0x0324, 0x396b,0x0646
      DC16 0x3492,0x0a8e, 0x3c5f,0x0388, 0x388e,0x070e
      DC16 0x3334,0x0bb7, 0x3bf4,0x03ed, 0x37af,0x07d6
      DC16 0x31d2,0x0cdf, 0x3b8a,0x0451, 0x36ce,0x089d
      DC16 0x306c,0x0e06, 0x3b1e,0x04b5, 0x35eb,0x0964
      DC16 0x2f02,0x0f2b, 0x3ab2,0x051a, 0x3505,0x0a2b
      DC16 0x2d93,0x1050, 0x3a46,0x057e, 0x341e,0x0af1
      DC16 0x2c21,0x1173, 0x39d9,0x05e2, 0x3334,0x0bb7
      DC16 0x2aaa,0x1294, 0x396b,0x0646, 0x3249,0x0c7c
      DC16 0x2931,0x13b4, 0x38fd,0x06aa, 0x315b,0x0d41
      DC16 0x27b3,0x14d2, 0x388e,0x070e, 0x306c,0x0e06
      DC16 0x2632,0x15ee, 0x381f,0x0772, 0x2f7b,0x0eca
      DC16 0x24ae,0x1709, 0x37af,0x07d6, 0x2e88,0x0f8d
      DC16 0x2326,0x1821, 0x373f,0x0839, 0x2d93,0x1050
      DC16 0x219c,0x1937, 0x36ce,0x089d, 0x2c9d,0x1112
      DC16 0x200e,0x1a4b, 0x365d,0x0901, 0x2ba4,0x11d3

发表于 2009-8-6 22:09

DC16 0x1e7e,0x1b5d, 0x35eb,0x0964, 0x2aaa,0x1294
      DC16 0x1ceb,0x1c6c, 0x3578,0x09c7, 0x29af,0x1354
      DC16 0x1b56,0x1d79, 0x3505,0x0a2b, 0x28b2,0x1413
      DC16 0x19be,0x1e84, 0x3492,0x0a8e, 0x27b3,0x14d2
      DC16 0x1824,0x1f8c, 0x341e,0x0af1, 0x26b3,0x1590
      DC16 0x1688,0x2091, 0x33a9,0x0b54, 0x25b1,0x164c
      DC16 0x14ea,0x2193, 0x3334,0x0bb7, 0x24ae,0x1709
      DC16 0x134a,0x2292, 0x32bf,0x0c1a, 0x23a9,0x17c4
      DC16 0x11a8,0x238e, 0x3249,0x0c7c, 0x22a3,0x187e
      DC16 0x1005,0x2488, 0x31d2,0x0cdf, 0x219c,0x1937
      DC16 0x0e61,0x257e, 0x315b,0x0d41, 0x2093,0x19ef
      DC16 0x0cbb,0x2671, 0x30e4,0x0da4, 0x1f89,0x1aa7
      DC16 0x0b14,0x2760, 0x306c,0x0e06, 0x1e7e,0x1b5d
      DC16 0x096d,0x284c, 0x2ff4,0x0e68, 0x1d72,0x1c12
      DC16 0x07c4,0x2935, 0x2f7b,0x0eca, 0x1c64,0x1cc6
      DC16 0x061b,0x2a1a, 0x2f02,0x0f2b, 0x1b56,0x1d79
      DC16 0x0471,0x2afb, 0x2e88,0x0f8d, 0x1a46,0x1e2b
      DC16 0x02c7,0x2bd8, 0x2e0e,0x0fee, 0x1935,0x1edc
      DC16 0x011c,0x2cb2, 0x2d93,0x1050, 0x1824,0x1f8c
      DC16 0xff72,0x2d88, 0x2d18,0x10b1, 0x1711,0x203a
      DC16 0xfdc7,0x2e5a, 0x2c9d,0x1112, 0x15fe,0x20e7
      DC16 0xfc1d,0x2f28, 0x2c21,0x1173, 0x14ea,0x2193
      DC16 0xfa73,0x2ff2, 0x2ba4,0x11d3, 0x13d5,0x223d
      DC16 0xf8ca,0x30b8, 0x2b28,0x1234, 0x12bf,0x22e7
      DC16 0xf721,0x3179, 0x2aaa,0x1294, 0x11a8,0x238e
      DC16 0xf579,0x3236, 0x2a2d,0x12f4, 0x1091,0x2435
      DC16 0xf3d2,0x32ef, 0x29af,0x1354, 0x0f79,0x24da
      DC16 0xf22c,0x33a3, 0x2931,0x13b4, 0x0e61,0x257e
      DC16 0xf087,0x3453, 0x28b2,0x1413, 0x0d48,0x2620
      DC16 0xeee3,0x34ff, 0x2833,0x1473, 0x0c2e,0x26c1
      DC16 0xed41,0x35a5, 0x27b3,0x14d2, 0x0b14,0x2760
      DC16 0xeba1,0x3648, 0x2733,0x1531, 0x09fa,0x27fe
      DC16 0xea02,0x36e5, 0x26b3,0x1590, 0x08df,0x289a
      DC16 0xe865,0x377e, 0x2632,0x15ee, 0x07c4,0x2935
      DC16 0xe6cb,0x3812, 0x25b1,0x164c, 0x06a9,0x29ce
      DC16 0xe532,0x38a1, 0x252f,0x16ab, 0x058d,0x2a65
      DC16 0xe39c,0x392b, 0x24ae,0x1709, 0x0471,0x2afb
      DC16 0xe208,0x39b0, 0x242b,0x1766, 0x0355,0x2b8f
      DC16 0xe077,0x3a30, 0x23a9,0x17c4, 0x0239,0x2c21
      DC16 0xdee9,0x3aab, 0x2326,0x1821, 0x011c,0x2cb2
      DC16 0xdd5d,0x3b21, 0x22a3,0x187e, 0x0000,0x2d41
      DC16 0xdbd5,0x3b92, 0x221f,0x18db, 0xfee4,0x2dcf
      DC16 0xda4f,0x3bfd, 0x219c,0x1937, 0xfdc7,0x2e5a
      DC16 0xd8cd,0x3c64, 0x2117,0x1993, 0xfcab,0x2ee4
      DC16 0xd74e,0x3cc5, 0x2093,0x19ef, 0xfb8f,0x2f6c
      DC16 0xd5d3,0x3d21, 0x200e,0x1a4b, 0xfa73,0x2ff2
      DC16 0xd45c,0x3d78, 0x1f89,0x1aa7, 0xf957,0x3076
      DC16 0xd2e8,0x3dc9, 0x1f04,0x1b02, 0xf83c,0x30f9
      DC16 0xd178,0x3e15, 0x1e7e,0x1b5d, 0xf721,0x3179
      DC16 0xd00c,0x3e5c, 0x1df8,0x1bb8, 0xf606,0x31f8
      DC16 0xcea5,0x3e9d, 0x1d72,0x1c12, 0xf4ec,0x3274
      DC16 0xcd41,0x3ed8, 0x1ceb,0x1c6c, 0xf3d2,0x32ef
      DC16 0xcbe2,0x3f0f, 0x1c64,0x1cc6, 0xf2b8,0x3368
      DC16 0xca88,0x3f40, 0x1bdd,0x1d20, 0xf19f,0x33df
      DC16 0xc932,0x3f6b, 0x1b56,0x1d79, 0xf087,0x3453
      DC16 0xc7e1,0x3f91, 0x1ace,0x1dd3, 0xef6f,0x34c6
      DC16 0xc695,0x3fb1, 0x1a46,0x1e2b, 0xee58,0x3537
      DC16 0xc54e,0x3fcc, 0x19be,0x1e84, 0xed41,0x35a5
      DC16 0xc40c,0x3fe1, 0x1935,0x1edc, 0xec2b,0x3612
      DC16 0xc2cf,0x3ff1, 0x18ad,0x1f34, 0xeb16,0x367d
      DC16 0xc197,0x3ffb, 0x1824,0x1f8c, 0xea02,0x36e5
      DC16 0xc065,0x4000, 0x179b,0x1fe3, 0xe8ef,0x374b
      DC16 0xbf38,0x3fff, 0x1711,0x203a, 0xe7dc,0x37b0
      DC16 0xbe11,0x3ff8, 0x1688,0x2091, 0xe6cb,0x3812
      DC16 0xbcf0,0x3fec, 0x15fe,0x20e7, 0xe5ba,0x3871
      DC16 0xbbd4,0x3fdb, 0x1574,0x213d, 0xe4aa,0x38cf
      DC16 0xbabf,0x3fc4, 0x14ea,0x2193, 0xe39c,0x392b
      DC16 0xb9af,0x3fa7, 0x145f,0x21e8, 0xe28e,0x3984
      DC16 0xb8a6,0x3f85, 0x13d5,0x223d, 0xe182,0x39db
      DC16 0xb7a2,0x3f5d, 0x134a,0x2292, 0xe077,0x3a30
      DC16 0xb6a5,0x3f30, 0x12bf,0x22e7, 0xdf6d,0x3a82
      DC16 0xb5af,0x3efd, 0x1234,0x233b, 0xde64,0x3ad3
      DC16 0xb4be,0x3ec5, 0x11a8,0x238e, 0xdd5d,0x3b21
      DC16 0xb3d5,0x3e88, 0x111d,0x23e2, 0xdc57,0x3b6d
      DC16 0xb2f2,0x3e45, 0x1091,0x2435, 0xdb52,0x3bb6
      DC16 0xb215,0x3dfc, 0x1005,0x2488, 0xda4f,0x3bfd
      DC16 0xb140,0x3daf, 0x0f79,0x24da, 0xd94d,0x3c42
      DC16 0xb071,0x3d5b, 0x0eed,0x252c, 0xd84d,0x3c85
      DC16 0xafa9,0x3d03, 0x0e61,0x257e, 0xd74e,0x3cc5
      DC16 0xaee8,0x3ca5, 0x0dd4,0x25cf, 0xd651,0x3d03
      DC16 0xae2e,0x3c42, 0x0d48,0x2620, 0xd556,0x3d3f
      DC16 0xad7b,0x3bda, 0x0cbb,0x2671, 0xd45c,0x3d78
      DC16 0xacd0,0x3b6d, 0x0c2e,0x26c1, 0xd363,0x3daf
      DC16 0xac2b,0x3afa, 0x0ba1,0x2711, 0xd26d,0x3de3
      DC16 0xab8e,0x3a82, 0x0b14,0x2760, 0xd178,0x3e15
      DC16 0xaaf8,0x3a06, 0x0a87,0x27af, 0xd085,0x3e45
      DC16 0xaa6a,0x3984, 0x09fa,0x27fe, 0xcf94,0x3e72
      DC16 0xa9e3,0x38fd, 0x096d,0x284c, 0xcea5,0x3e9d
      DC16 0xa963,0x3871, 0x08df,0x289a, 0xcdb7,0x3ec5

发表于 2009-8-6 22:10

DC16 0xa8eb,0x37e1, 0x0852,0x28e7, 0xcccc,0x3eeb
      DC16 0xa87b,0x374b, 0x07c4,0x2935, 0xcbe2,0x3f0f
      DC16 0xa812,0x36b1, 0x0736,0x2981, 0xcafb,0x3f30
      DC16 0xa7b1,0x3612, 0x06a9,0x29ce, 0xca15,0x3f4f
      DC16 0xa757,0x356e, 0x061b,0x2a1a, 0xc932,0x3f6b
      DC16 0xa705,0x34c6, 0x058d,0x2a65, 0xc851,0x3f85
      DC16 0xa6bb,0x3419, 0x04ff,0x2ab0, 0xc772,0x3f9c
      DC16 0xa678,0x3368, 0x0471,0x2afb, 0xc695,0x3fb1
      DC16 0xa63e,0x32b2, 0x03e3,0x2b45, 0xc5ba,0x3fc4
      DC16 0xa60b,0x31f8, 0x0355,0x2b8f, 0xc4e2,0x3fd4
      DC16 0xa5e0,0x3139, 0x02c7,0x2bd8, 0xc40c,0x3fe1
      DC16 0xa5bc,0x3076, 0x0239,0x2c21, 0xc338,0x3fec
      DC16 0xa5a1,0x2faf, 0x01aa,0x2c6a, 0xc266,0x3ff5
      DC16 0xa58d,0x2ee4, 0x011c,0x2cb2, 0xc197,0x3ffb
      DC16 0xa581,0x2e15, 0x008e,0x2cfa, 0xc0ca,0x3fff
      DC16 0xa57e,0x2d41, 0x0000,0x2d41, 0xc000,0x4000
      DC16 0xa581,0x2c6a, 0xff72,0x2d88, 0xbf38,0x3fff
      DC16 0xa58d,0x2b8f, 0xfee4,0x2dcf, 0xbe73,0x3ffb
      DC16 0xa5a1,0x2ab0, 0xfe56,0x2e15, 0xbdb0,0x3ff5
      DC16 0xa5bc,0x29ce, 0xfdc7,0x2e5a, 0xbcf0,0x3fec
      DC16 0xa5e0,0x28e7, 0xfd39,0x2e9f, 0xbc32,0x3fe1
      DC16 0xa60b,0x27fe, 0xfcab,0x2ee4, 0xbb77,0x3fd4
      DC16 0xa63e,0x2711, 0xfc1d,0x2f28, 0xbabf,0x3fc4
      DC16 0xa678,0x2620, 0xfb8f,0x2f6c, 0xba09,0x3fb1
      DC16 0xa6bb,0x252c, 0xfb01,0x2faf, 0xb956,0x3f9c
      DC16 0xa705,0x2435, 0xfa73,0x2ff2, 0xb8a6,0x3f85
      DC16 0xa757,0x233b, 0xf9e5,0x3034, 0xb7f8,0x3f6b
      DC16 0xa7b1,0x223d, 0xf957,0x3076, 0xb74d,0x3f4f
      DC16 0xa812,0x213d, 0xf8ca,0x30b8, 0xb6a5,0x3f30
      DC16 0xa87b,0x203a, 0xf83c,0x30f9, 0xb600,0x3f0f
      DC16 0xa8eb,0x1f34, 0xf7ae,0x3139, 0xb55e,0x3eeb
      DC16 0xa963,0x1e2b, 0xf721,0x3179, 0xb4be,0x3ec5
      DC16 0xa9e3,0x1d20, 0xf693,0x31b9, 0xb422,0x3e9d
      DC16 0xaa6a,0x1c12, 0xf606,0x31f8, 0xb388,0x3e72
      DC16 0xaaf8,0x1b02, 0xf579,0x3236, 0xb2f2,0x3e45
      DC16 0xab8e,0x19ef, 0xf4ec,0x3274, 0xb25e,0x3e15
      DC16 0xac2b,0x18db, 0xf45f,0x32b2, 0xb1cd,0x3de3
      DC16 0xacd0,0x17c4, 0xf3d2,0x32ef, 0xb140,0x3daf
      DC16 0xad7b,0x16ab, 0xf345,0x332c, 0xb0b5,0x3d78
      DC16 0xae2e,0x1590, 0xf2b8,0x3368, 0xb02d,0x3d3f
      DC16 0xaee8,0x1473, 0xf22c,0x33a3, 0xafa9,0x3d03
      DC16 0xafa9,0x1354, 0xf19f,0x33df, 0xaf28,0x3cc5
      DC16 0xb071,0x1234, 0xf113,0x3419, 0xaea9,0x3c85
      DC16 0xb140,0x1112, 0xf087,0x3453, 0xae2e,0x3c42
      DC16 0xb215,0x0fee, 0xeffb,0x348d, 0xadb6,0x3bfd
      DC16 0xb2f2,0x0eca, 0xef6f,0x34c6, 0xad41,0x3bb6
      DC16 0xb3d5,0x0da4, 0xeee3,0x34ff, 0xacd0,0x3b6d
      DC16 0xb4be,0x0c7c, 0xee58,0x3537, 0xac61,0x3b21
      DC16 0xb5af,0x0b54, 0xedcc,0x356e, 0xabf6,0x3ad3
      DC16 0xb6a5,0x0a2b, 0xed41,0x35a5, 0xab8e,0x3a82
      DC16 0xb7a2,0x0901, 0xecb6,0x35dc, 0xab29,0x3a30
      DC16 0xb8a6,0x07d6, 0xec2b,0x3612, 0xaac8,0x39db
      DC16 0xb9af,0x06aa, 0xeba1,0x3648, 0xaa6a,0x3984
      DC16 0xbabf,0x057e, 0xeb16,0x367d, 0xaa0f,0x392b
      DC16 0xbbd4,0x0451, 0xea8c,0x36b1, 0xa9b7,0x38cf
      DC16 0xbcf0,0x0324, 0xea02,0x36e5, 0xa963,0x3871
      DC16 0xbe11,0x01f7, 0xe978,0x3718, 0xa912,0x3812
      DC16 0xbf38,0x00c9, 0xe8ef,0x374b, 0xa8c5,0x37b0
      DC16 0xc065,0xff9b, 0xe865,0x377e, 0xa87b,0x374b
      DC16 0xc197,0xfe6e, 0xe7dc,0x37b0, 0xa834,0x36e5
      DC16 0xc2cf,0xfd40, 0xe753,0x37e1, 0xa7f1,0x367d
      DC16 0xc40c,0xfc13, 0xe6cb,0x3812, 0xa7b1,0x3612
      DC16 0xc54e,0xfae6, 0xe642,0x3842, 0xa774,0x35a5
      DC16 0xc695,0xf9ba, 0xe5ba,0x3871, 0xa73b,0x3537
      DC16 0xc7e1,0xf88e, 0xe532,0x38a1, 0xa705,0x34c6
      DC16 0xc932,0xf763, 0xe4aa,0x38cf, 0xa6d3,0x3453
      DC16 0xca88,0xf639, 0xe423,0x38fd, 0xa6a4,0x33df
      DC16 0xcbe2,0xf50f, 0xe39c,0x392b, 0xa678,0x3368
      DC16 0xcd41,0xf3e6, 0xe315,0x3958, 0xa650,0x32ef
      DC16 0xcea5,0xf2bf, 0xe28e,0x3984, 0xa62c,0x3274
      DC16 0xd00c,0xf198, 0xe208,0x39b0, 0xa60b,0x31f8
      DC16 0xd178,0xf073, 0xe182,0x39db, 0xa5ed,0x3179
      DC16 0xd2e8,0xef4f, 0xe0fc,0x3a06, 0xa5d3,0x30f9
      DC16 0xd45c,0xee2d, 0xe077,0x3a30, 0xa5bc,0x3076
      DC16 0xd5d3,0xed0c, 0xdff2,0x3a59, 0xa5a9,0x2ff2
      DC16 0xd74e,0xebed, 0xdf6d,0x3a82, 0xa599,0x2f6c
      DC16 0xd8cd,0xeacf, 0xdee9,0x3aab, 0xa58d,0x2ee4
      DC16 0xda4f,0xe9b4, 0xde64,0x3ad3, 0xa585,0x2e5a
      DC16 0xdbd5,0xe89a, 0xdde1,0x3afa, 0xa57f,0x2dcf
      DC16 0xdd5d,0xe782, 0xdd5d,0x3b21, 0xa57e,0x2d41
      DC16 0xdee9,0xe66d, 0xdcda,0x3b47, 0xa57f,0x2cb2
      DC16 0xe077,0xe559, 0xdc57,0x3b6d, 0xa585,0x2c21
      DC16 0xe208,0xe448, 0xdbd5,0x3b92, 0xa58d,0x2b8f
      DC16 0xe39c,0xe33a, 0xdb52,0x3bb6, 0xa599,0x2afb
      DC16 0xe532,0xe22d, 0xdad1,0x3bda, 0xa5a9,0x2a65
      DC16 0xe6cb,0xe124, 0xda4f,0x3bfd, 0xa5bc,0x29ce
      DC16 0xe865,0xe01d, 0xd9ce,0x3c20, 0xa5d3,0x2935
      DC16 0xea02,0xdf19, 0xd94d,0x3c42, 0xa5ed,0x289a
      DC16 0xeba1,0xde18, 0xd8cd,0x3c64, 0xa60b,0x27fe
      DC16 0xed41,0xdd19, 0xd84d,0x3c85, 0xa62c,0x2760
      DC16 0xeee3,0xdc1e, 0xd7cd,0x3ca5, 0xa650,0x26c1
      DC16 0xf087,0xdb26, 0xd74e,0x3cc5, 0xa678,0x2620
      DC16 0xf22c,0xda31, 0xd6cf,0x3ce4, 0xa6a4,0x257e
      DC16 0xf3d2,0xd93f, 0xd651,0x3d03, 0xa6d3,0x24da
      DC16 0xf579,0xd851, 0xd5d3,0x3d21, 0xa705,0x2435
      DC16 0xf721,0xd766, 0xd556,0x3d3f, 0xa73b,0x238e
      DC16 0xf8ca,0xd67f, 0xd4d8,0x3d5b, 0xa774,0x22e7
      DC16 0xfa73,0xd59b, 0xd45c,0x3d78, 0xa7b1,0x223d
      DC16 0xfc1d,0xd4bb, 0xd3df,0x3d93, 0xa7f1,0x2193
      DC16 0xfdc7,0xd3df, 0xd363,0x3daf, 0xa834,0x20e7
      DC16 0xff72,0xd306, 0xd2e8,0x3dc9, 0xa87b,0x203a
      DC16 0x011c,0xd231, 0xd26d,0x3de3, 0xa8c5,0x1f8c
      DC16 0x02c7,0xd161, 0xd1f2,0x3dfc, 0xa912,0x1edc
      DC16 0x0471,0xd094, 0xd178,0x3e15, 0xa963,0x1e2b
      DC16 0x061b,0xcfcc, 0xd0fe,0x3e2d, 0xa9b7,0x1d79
      DC16 0x07c4,0xcf07, 0xd085,0x3e45, 0xaa0f,0x1cc6
      DC16 0x096d,0xce47, 0xd00c,0x3e5c, 0xaa6a,0x1c12
      DC16 0x0b14,0xcd8c, 0xcf94,0x3e72, 0xaac8,0x1b5d
      DC16 0x0cbb,0xccd4, 0xcf1c,0x3e88, 0xab29,0x1aa7
      DC16 0x0e61,0xcc21, 0xcea5,0x3e9d, 0xab8e,0x19ef
      DC16 0x1005,0xcb73, 0xce2e,0x3eb1, 0xabf6,0x1937
      DC16 0x11a8,0xcac9, 0xcdb7,0x3ec5, 0xac61,0x187e
      DC16 0x134a,0xca24, 0xcd41,0x3ed8, 0xacd0,0x17c4
      DC16 0x14ea,0xc983, 0xcccc,0x3eeb, 0xad41,0x1709
      DC16 0x1688,0xc8e8, 0xcc57,0x3efd, 0xadb6,0x164c
      DC16 0x1824,0xc850, 0xcbe2,0x3f0f, 0xae2e,0x1590
      DC16 0x19be,0xc7be, 0xcb6e,0x3f20, 0xaea9,0x14d2
      DC16 0x1b56,0xc731, 0xcafb,0x3f30, 0xaf28,0x1413
      DC16 0x1ceb,0xc6a8, 0xca88,0x3f40, 0xafa9,0x1354
      DC16 0x1e7e,0xc625, 0xca15,0x3f4f, 0xb02d,0x1294
      DC16 0x200e,0xc5a7, 0xc9a3,0x3f5d, 0xb0b5,0x11d3
      DC16 0x219c,0xc52d, 0xc932,0x3f6b, 0xb140,0x1112
      DC16 0x2326,0xc4b9, 0xc8c1,0x3f78, 0xb1cd,0x1050
      DC16 0x24ae,0xc44a, 0xc851,0x3f85, 0xb25e,0x0f8d
      DC16 0x2632,0xc3e0, 0xc7e1,0x3f91, 0xb2f2,0x0eca
      DC16 0x27b3,0xc37b, 0xc772,0x3f9c, 0xb388,0x0e06
      DC16 0x2931,0xc31c, 0xc703,0x3fa7, 0xb422,0x0d41
      DC16 0x2aaa,0xc2c1, 0xc695,0x3fb1, 0xb4be,0x0c7c
      DC16 0x2c21,0xc26d, 0xc627,0x3fbb, 0xb55e,0x0bb7
      DC16 0x2d93,0xc21d, 0xc5ba,0x3fc4, 0xb600,0x0af1
      DC16 0x2f02,0xc1d3, 0xc54e,0x3fcc, 0xb6a5,0x0a2b
      DC16 0x306c,0xc18e, 0xc4e2,0x3fd4, 0xb74d,0x0964
      DC16 0x31d2,0xc14f, 0xc476,0x3fdb, 0xb7f8,0x089d
      DC16 0x3334,0xc115, 0xc40c,0x3fe1, 0xb8a6,0x07d6
      DC16 0x3492,0xc0e0, 0xc3a1,0x3fe7, 0xb956,0x070e
      DC16 0x35eb,0xc0b1, 0xc338,0x3fec, 0xba09,0x0646
      DC16 0x373f,0xc088, 0xc2cf,0x3ff1, 0xbabf,0x057e
      DC16 0x388e,0xc064, 0xc266,0x3ff5, 0xbb77,0x04b5
      DC16 0x39d9,0xc045, 0xc1fe,0x3ff8, 0xbc32,0x03ed
      DC16 0x3b1e,0xc02c, 0xc197,0x3ffb, 0xbcf0,0x0324
      DC16 0x3c5f,0xc019, 0xc130,0x3ffd, 0xbdb0,0x025b
      DC16 0x3d9a,0xc00b, 0xc0ca,0x3fff, 0xbe73,0x0192
      DC16 0x3ed0,0xc003, 0xc065,0x4000, 0xbf38,0x00c9


   END
/******************* (C) COPYRIGHT 2009  STMicroelectronics *****END OF FILE****/

发表于 2009-8-6 23:43

楼主真热心，支持下

发表于 2009-8-10 13:04

楼主的这个函数1024点的可以用吗？我按照网上的把汇编代码改过以后，发现256点的没什么问题，1024点的结果不对，我用一个1024点的数组，数组里面全部初始化为同样的数值，基本上就是直流了，正常情况出来的结果应该只有第一组数据比较大，其余都比较小，但实际仿真发现，但fft出来的结果前两组数据都比较大，且差不多大，然后后面的数据才相对较小，正在查找还不知道是什么原因

发表于 2009-8-10 21:20

哎，又是我错了，进行fft的数据源必须定义成long，即使你的所有数据没有超过short型的

发表于 2009-8-23 10:31

LZ能不能共享一下代码？？我也在看这个，但是我怎么试一下，发现64个点的也不对。

发表于 2012-5-23 23:18

mark^_^:D:D

香水城：帮忙解释下STM32 FFT 取模的函数

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