• TMS320F28335调用官方库进行FFT频谱分析

    移植

    首先进入TI官网下载软件支持包，我们需要的FFT官方包就在这里边。

    TMS320F28335 data sheet, product information and support | TI.com

    下载完成后，解压。进入以下目录

    C2000Ware_4_01_00_00_Software__all\C2000Ware_4_01_00_00\libraries\dsp\FPU\c28

    里面只需要Include、source文件夹的内容，lib文件夹不需要，新版本库一律被集成到了rts2800 fpu32.ib这个库里面了。

    Include：复制到你的工程中备用，将里面fpu64文件夹删除，fpu32文件夹里的除了f2837xd_filter文件夹全整理出来到include文件夹中。整理完如下：

    source：同样复制到你的工程目录即可，删除里面的C28x_FPU_LIB_DEPRECATED文件夹和fpu64文件夹，并把fpu32文件夹内容整理出来。整理完如下

    并且把fft文件夹里面带有TMU0后缀的汇编源码全部删除了

    此时的你的CCS工程应该有如下文件树：

     

    打开工程设置将头文件路径添加进去

    因为只用到实傅里叶变化和实时计算旋转因子表，可以将fft文件夹中的cfft和table都删除了，此时fft文件夹应只有有如下源码文件

    到这一步，官方的FFT源码移植完成了。

    测试

    测试可以直接使用官方的测试数据和代码进行测试，在下载软件包C2000Ware_4_01_00_00\libraries\dsp\FPU\c28\examples\fft\rfft_adc_f32 目录中可以找到

    其中的dsp_rfft_adc.c 、golden.c、input.c 为测试FFT计算程序、正确数据、输入数据。

    大致流程为输入的数据经过FFT计算后与正确数据进行比对。

    在这里我提供一套我自己编写的测试程序。

    以下是我编写的FFT相关参数，12位ADC、1000Hz采样频率、1024采样点，输入信号如下图：

     

     RFFT.h

    1. /*
    2.  * RFFT.h
    3.  *
    4.  *  Created on: 2022年11月2日
    5.  *      Author: Administrator
    6.  */
    7.  
    8. #ifndef APP_RFFT_H_
    9. #define APP_RFFT_H_
    10.  
    11. #include "DSP28x_Project.h"
    12. #include 
    13. #include 
    14.  
    15.  
    16. #define RFFT_Analyse_MaxNum 20
    17.  
    18. typedef struct {
    19.     Uint16 Wave_Num;
    20.     float DC_Amp;
    21.     float Amp[RFFT_Analyse_MaxNum];
    22.     float freq[RFFT_Analyse_MaxNum];
    23.     float Phase[RFFT_Analyse_MaxNum];
    24. } RFFT_Analyse_Struct;
    25.  
    26.  
    27. void RFFT_ADC_Init();
    28. void RFFT_ADC_Caculate();
    29. float RFFT_Fractional_Frequency(float ratio);
    30. void RFFT_Analyse(float *src);
    31. float RFFT_Phase_Caculate(Uint16 index,float ratio);
    32.  
    33. Uint16 RFFT_Peak_Find(float *src ,Uint16 len,Uint16 *index); //幅度谱及其长度
    34.  
    35.  
    36. #endif /* APP_RFFT_H_ */

    RFFT.c

    1. /*
    2.  * RFFT.c
    3.  *
    4.  *  Created on: 2022年11月2日
    5.  *      Author: Administrator
    6.  */
    7.  
    8.  
    9. #include "dsp.h"
    10. #include "fpu_rfft.h"
    11. #include "RFFT.h"
    12. #include 
    13. #include "complex.h"
    14.  
    15. #define Fs 1000
    16. #define FFT_STAGES      (10U)   //迭代次数 =Log2(FFT_SIZE)
    17. #define FFT_SIZE        (1 << FFT_STAGES)  //FFT计算点数
    18.  
    19. RFFT_F32_STRUCT rfft;
    20. RFFT_ADC_F32_STRUCT rfft_adc;
    21. RFFT_F32_STRUCT_Handle hnd_rfft = &rfft;
    22. RFFT_ADC_F32_STRUCT_Handle hnd_rfft_adc = &rfft_adc;
    23. RFFT_Analyse_Struct rfft_analyse;
    24.  
    25. //#pragma DATA_SECTION(FFT_input, "FFT_buffer");
    26. #pragma DATA_SECTION(FFT_output, "FFT_buffer1");
    27. #pragma DATA_SECTION(FFT_twiddleFactors, "FFT_buffer2");
    28. #pragma DATA_SECTION(FFT_magnitude_phase, "FFT_buffer3");
    29.  
    30. //uint16_t FFT_input[FFT_SIZE];
    31. extern uint16_t FFT_input[2U*FFT_SIZE];
    32. float FFT_twiddleFactors[FFT_SIZE];
    33. float FFT_output[FFT_SIZE];
    34. float FFT_magnitude_phase[(FFT_SIZE >> 1) + 1];
    35.  
    36.  
    37. #define MAX(a, b) (((a) > (b)) ? (a) : (b))
    38. #define MIN(a, b) (((a) < (b)) ? (a) : (b))
    39.  
    40.  
    41. float myabs;
    42.  
    43. void RFFT_ADC_Init()
    44. {
    45.  
    46.     RFFT_f32_setInputPtr(hnd_rfft, (float *)FFT_input);
    47.     RFFT_f32_setOutputPtr(hnd_rfft, FFT_output);
    48.     RFFT_f32_setStages(hnd_rfft,  FFT_STAGES);
    49.     RFFT_f32_setFFTSize(hnd_rfft, FFT_SIZE);
    50.     RFFT_f32_setMagnitudePtr(hnd_rfft, FFT_magnitude_phase);
    51.     RFFT_f32_setPhasePtr(hnd_rfft, FFT_magnitude_phase);
    52.  
    53.     RFFT_f32_setTwiddlesPtr(hnd_rfft, FFT_twiddleFactors);
    54.     RFFT_f32_sincostable(hnd_rfft);
    55.  
    56.     RFFT_ADC_f32_setTailPtr(hnd_rfft_adc, &(hnd_rfft->OutBuf));
    57.     RFFT_ADC_f32_setInBufPtr(hnd_rfft_adc, FFT_input);
    58. }
    59.  
    60. void RFFT_ADC_Caculate()
    61. {
    62.     float* temp;
    63.  
    64.     RFFT_adc_f32(hnd_rfft_adc);
    65.     RFFT_f32_mag(hnd_rfft);
    66.     temp=RFFT_f32_getMagnitudePtr(hnd_rfft);
    67.     RFFT_Analyse(temp);
    68. }
    69.  
    70. float RFFT_Phase_Caculate(Uint16 index,float ratio)
    71. {
    72.     complex p;
    73.     complex FFT_value;
    74.  
    75.     p=(1-cexpf((2*M_PI*ratio/FFT_SIZE)*I));
    76.     p=p/ (1-cexpf((2*M_PI*ratio)*I));
    77.     FFT_value=FFT_output[index]+FFT_output[FFT_SIZE-index]*I;
    78.     p=FFT_value*p;
    79.  
    80.     return (cargf(p)+M_PI/2);
    81. }
    82.  
    83. Uint16 RFFT_Peak_Find(float *src ,Uint16 len,Uint16 *index) //幅度谱及其长度
    84. {
    85.     Uint16 num=0;
    86.     Uint16 i;
    87.     float max_data=0;
    88.     float data1=0;
    89.     float data2=0;
    90.     float data3=0;
    91.  
    92.  
    93.     for (i=1;i
    94.     {
    95.         if(*(src+i)>max_data)
    96.             max_data=*(src+i);
    97.     }
    98.     for (i=1;i-1;i++)
    99.     {
    100.         data1=*(src+i-1);
    101.         data2=*(src+i);
    102.         data3=*(src+i+1);
    103.         if((data1data3) && (data2 >max_data*0.1))
    104.         {
    105.             if(num<20)
    106.             {
    107.             *(index+num)=i;
    108.             num++;
    109.             }
    110.             else
    111.                 return num;
    112.         }
    113.     }
    114.     return num;
    115. }
    116.  
    117.  
    118.  
    119.  
    120. float RFFT_Fractional_Frequency(float ratio)
    121.  {
    122.       Uint16 niter;
    123.       float K,f,a,b,y,yp;
    124.       f=0;
    125.       K=(M_PI/FFT_SIZE) * sin(M_PI/FFT_SIZE);
    126.       for(niter=0;niter<20;niter++)
    127.       {
    128.           a  = sin(M_PI*f/FFT_SIZE);
    129.           b  = sin(M_PI*(f-1)/FFT_SIZE);
    130.  
    131.           y  = ratio - a/b;
    132.           yp = K / (b*b);
    133.           f = MAX(-0.5, MIN(f - y/yp, 0.5));
    134.       }
    135.       return f;
    136.  }
    137.  
    138.  
    139. void RFFT_Analyse(float *src)
    140. {
    141.     Uint16 i;
    142.     float ratio;
    143.     float FFT_Value;
    144.     Uint16 peak_index[RFFT_Analyse_MaxNum];
    145.  
    146.     memset(peak_index, 0U, RFFT_Analyse_MaxNum*sizeof(Uint16));
    147.     memset(rfft_analyse.freq, 0U, RFFT_Analyse_MaxNum*sizeof(float));
    148.     memset(rfft_analyse.Amp, 0U, RFFT_Analyse_MaxNum*sizeof(float));
    149.     memset(rfft_analyse.Phase, 0U, RFFT_Analyse_MaxNum*sizeof(float));
    150.  
    151.     rfft_analyse.Wave_Num=RFFT_Peak_Find(src,FFT_SIZE/2,peak_index);
    152.  
    153.     for(i=0;i
    154.     {
    155.         FFT_Value=*(src+peak_index[i]);
    156.         ratio = (*(src+peak_index[i]+1))/FFT_Value;
    157.         if ((*(src+peak_index[i]+1)) > (*(src+peak_index[i]-1)))
    158.           ratio = -ratio;
    159.         ratio = RFFT_Fractional_Frequency(ratio);
    160.         rfft_analyse.freq[i]  = (*(peak_index+i)-1+ratio)*Fs/FFT_SIZE;
    161.         rfft_analyse.Amp[i]   = 2 *FFT_Value * fabsf(sin(M_PI*ratio/FFT_SIZE)/sin(M_PI*ratio));
    162.         rfft_analyse.Phase[i]  = RFFT_Phase_Caculate(peak_index[i],ratio);
    163.     }
    164.     for(i=0;i
    165.     {
    166.         rfft_analyse.Phase[i]=rfft_analyse.Phase[i]-rfft_analyse.Phase[0];
    167.         rfft_analyse.Phase[i]=rfft_analyse.Phase[i]*180/M_PI;
    168.     }
    169.     rfft_analyse.DC_Amp=*src/FFT_SIZE;
    170. }
    171.  
    172.  
    173.  
    174.  
    175.  
    176.  
    177.

    input.c

    1. //#############################################################################
    2. //! \file   input.c
    3. //! \brief  Input Vector (512) 
    4. //! \author Vishal Coelho 
    5. //! \date   22-Aug-2016
    6. //! 
    7. //
    8. //  Group:          C2000
    9. //  Target Family:  $DEVICE$
    10. //
    11. //#############################################################################
    12. //
    13. //
    14. // $Copyright: Copyright (C) 2020 Texas Instruments Incorporated -
    15. //             http://www.ti.com/ ALL RIGHTS RESERVED $
    16. //#############################################################################
    17.  
    18. #include 
    19.  
    20.  
    21. #pragma DATA_SECTION(FFT_input, "FFT_buffer3")
    22.  
    23.  
    24. // Matrix is 2 times its required sizeas it will be used to store
    25. // 1024 floats at a later point
    26. uint16_t FFT_input[2048] = {
    27.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    28.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    29.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    30.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    31.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    32.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    33.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    34.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    35.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    36.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    37.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    38.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    39.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    40.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    41.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    42.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    43.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    44.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    45.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    46.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    47.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    48.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    49.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    50.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    51.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    52.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    53.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    54.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    55.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    56.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    57.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    58.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    59.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    60.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    61.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    62.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    63.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    64.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    65.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    66.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    67.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    68.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    69.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    70.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    71.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    72.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    73.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    74.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    75.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    76.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    77.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    78.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    79.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    80.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    81.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    82.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    83.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    84.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    85.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    86.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    87.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    88.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    89.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    90.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    91.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    92.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    93.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    94.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    95.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    96.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    97.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    98.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    99.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    100.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    101.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    102.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    103.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    104.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    105.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    106.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    107.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    108.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    109.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    110.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    111.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    112.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    113.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    114.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    115.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    116.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    117.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    118.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    119.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    120.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    121.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    122.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    123.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    124.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    125.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    126.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    127.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    128.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    129.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    130.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    131.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    132.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    133.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    134.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    135.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    136.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    137.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    138.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    139.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    140.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    141.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    142.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    143.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    144.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    145.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    146.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    147.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    148.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    149.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    150.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    151.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    152.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    153.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    154.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    155.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    156.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    157.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    158.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    159.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    160.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    161.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    162.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    163.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    164.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    165.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    166.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    167.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    168.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    169.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    170.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    171.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    172.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    173.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    174.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    175.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    176.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    177.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    178.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    179.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    180.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    181.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    182.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    183.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    184.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    185.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    186.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    187.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    188.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    189.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    190.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    191.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    192.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    193.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    194.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    195.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    196.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    197.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    198.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    199.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    200.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    201.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    202.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    203.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    204.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    205.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    206.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    207.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    208.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    209.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    210.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    211.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    212.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    213.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    214.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    215.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    216.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    217.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    218.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    219.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    220.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    221.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    222.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    223.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    224.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    225.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    226.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    227.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    228.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    229.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    230.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    231.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    232.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    233.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    234.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    235.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    236.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    237.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    238.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    239.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    240.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    241.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    242.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    243.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    244.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    245.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    246.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    247.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    248.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    249.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    250.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    251.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    252.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    253.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    254.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    255.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    256.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    257.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    258.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    259.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    260.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    261.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    262.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    263.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    264.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    265.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    266.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    267.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    268.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    269.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    270.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    271.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    272.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    273.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    274.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    275.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    276.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    277.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    278.     2.258888e+03, 2.628179e+03, 2.054902e+03, 2.438736e+03,
    279.     1.750881e+03, 1.040492e+03, 3.077914e+03, 2.589702e+03,
    280.     1.876330e+03, 1.952391e+03, 1.479973e+03, 1.809179e+03,
    281.     1.275987e+03, 1.776151e+03, 1.269484e+03, 7.874067e+02,
    282.     3.077914e+03, 2.842787e+03, 2.357726e+03, 2.614976e+03,
    283. }; 
    284.  
    285.  
    286.  
    287.  
    288. // End of File

    cmd文件：

    1. /*
    2. // TI File $Revision: /main/3 $
    3. // Checkin $Date: July 9, 2008   14:12:45 $
    4. //###########################################################################
    5. //
    6. // FILE:    28335_RAM_lnk.cmd
    7. //
    8. // TITLE:   Linker Command File For IQmath examples that run out of RAM
    9. //
    10. // NOTE; The example project uses memory protected by the
    11. //       Code Security Module (CSM).  Make sure the CSM is
    12. //       unlocked before you load the project.  One quick way
    13. //       to do this on an erased device is to open a memory
    14. //       window to the CSM password locations.  If these locations
    15. //       read back 0xFFFF (or non-zero), then the CSM is unlocked:
    16. //
    17. //      Device    Password locations
    18. //      28335:    0x33FFF8 - 0x33FFFF
    19. //
    20. //###########################################################################
    21. //
    22. //
    23. // $Copyright: Copyright (C) 2014-2022 Texas Instruments Incorporated -
    24. //             http://www.ti.com/ ALL RIGHTS RESERVED $
    25. //###########################################################################
    26. */
    27.  
    28.  
    29.  
    30.  
    31. MEMORY
    32. {
    33. PAGE 0 :
    34.    BEGIN      : origin = 0x000000, length = 0x000002     /* Boot to M0 will go here                      */
    35.    BOOT_RSVD  : origin = 0x000002, length = 0x00004E     /* Part of M0, BOOT rom will use this for stack */
    36.  
    37.    RAML0      : origin = 0x008000, length = 0x000800
    38.    RAML1L2    : origin = 0x008800, length = 0x004800
    39.    ZONE7A     : origin = 0x200000, length = 0x00FC00    /* XINTF zone 7 - program space */
    40.  
    41.    FLASHH     : origin = 0x300000, length = 0x008000     /* on-chip FLASH */
    42.    FLASHG     : origin = 0x308000, length = 0x008000     /* on-chip FLASH */
    43.    FLASHF     : origin = 0x310000, length = 0x008000     /* on-chip FLASH */
    44.    FLASHE     : origin = 0x318000, length = 0x008000     /* on-chip FLASH */
    45.    FLASHD     : origin = 0x320000, length = 0x008000     /* on-chip FLASH */
    46.    FLASHC     : origin = 0x328000, length = 0x008000     /* on-chip FLASH */
    47.    FLASHA     : origin = 0x338000, length = 0x007F80     /* on-chip FLASH */
    48.  
    49.  
    50.    CSM_RSVD   : origin = 0x33FF80, length = 0x000076     /* Part of FLASHA.  Program with all 0x0000 when CSM is in use. */
    51.    CSM_PWL    : origin = 0x33FFF8, length = 0x000008     /* Part of FLASHA.  CSM password locations in FLASHA            */
    52.    OTP         : origin = 0x380400, length = 0x000400     /* on-chip OTP */
    53.    ADC_CAL    : origin = 0x380080, length = 0x000009
    54.  
    55.    IQTABLES    : origin = 0x3FE000, length = 0x000b50     /* IQ Math Tables in Boot ROM */
    56.    IQTABLES2   : origin = 0x3FEB50, length = 0x00008c     /* IQ Math Tables in Boot ROM */
    57.    FPUTABLES   : origin = 0x3FEBDC, length = 0x0006A0     /* FPU Tables in Boot ROM */
    58.    ROM         : origin = 0x3FF27C, length = 0x000D44     /* Boot ROM */
    59.  
    60.    RESET      : origin = 0x3FFFC0, length = 0x000002
    61.    VECTORS     : origin = 0x3FFFC2, length = 0x00003E     /* part of boot ROM  */
    62.  
    63.  
    64.  
    65.  
    66.  
    67.  
    68.  
    69. PAGE 1 :
    70.    BOOT_RSVD  : origin = 0x000002, length = 0x00004E     /* Part of M0, BOOT rom will use this for stack */
    71.    RAMM0      : origin = 0x000050, length = 0x0003B0     /* on-chip RAM block M0 */
    72.    RAMM1      : origin = 0x000400, length = 0x000400     /* on-chip RAM block M1 */
    73.    RAML3      : origin = 0x00D000, length = 0x001000
    74.    RAML4      : origin = 0x00E000, length = 0x001000
    75.    RAML5      : origin = 0x00F000, length = 0x001000
    76.    ZONE7B     : origin = 0x20FC00, length = 0x000400     /* XINTF zone 7 - data space */
    77.    FLASHB     : origin = 0x330000, length = 0x008000     /* on-chip FLASH */
    78.  
    79. }
    80.  
    81.  
    82. SECTIONS
    83. {
    84.    FPUmathTables    : > FPUTABLES, PAGE = 0, TYPE = NOLOAD
    85.    /* Setup for "boot to SARAM" mode:
    86.       The codestart section (found in DSP28_CodeStartBranch.asm)
    87.       re-directs execution to the start of user code.  */
    88.  
    89.    codestart        : > BEGIN,     PAGE = 0
    90.  
    91. #ifdef __TI_COMPILER_VERSION__
    92.     #if __TI_COMPILER_VERSION__ >= 15009000
    93.         .TI.ramfunc : {} LOAD = RAML0,
    94.                          RUN = RAML0,
    95.                          LOAD_START(_RamfuncsLoadStart),
    96.                          LOAD_END(_RamfuncsLoadEnd),
    97.                          RUN_START(_RamfuncsRunStart),
    98.                          LOAD_SIZE(_RamfuncsLoadSize),
    99.                          PAGE = 0
    100.     #else
    101.         ramfuncs       : LOAD = RAML0,
    102.                          RUN = RAML0,
    103.                          LOAD_START(_RamfuncsLoadStart),
    104.                          LOAD_END(_RamfuncsLoadEnd),
    105.                          RUN_START(_RamfuncsRunStart),
    106.                          LOAD_SIZE(_RamfuncsLoadSize),
    107.                          PAGE = 0
    108.     #endif
    109. #endif
    110.  
    111. 	.text           : {*(.text)}>> RAML1L2|RAML0 PAGE = 0
    112. 	.cinit          : > RAML0,     PAGE = 0
    113.     .pinit           : > RAML0,     PAGE = 0
    114.     .switch          : > RAML0,     PAGE = 0
    115.  
    116.     .stack           : > RAMM1,     PAGE = 1
    117.     .ebss            : > RAML3,     PAGE = 1
    118.     .econst          : > RAML3,     PAGE = 1
    119.     .sysmem          : > RAML3,     PAGE = 1
    120.     .esysmem         : > RAML3,     PAGE = 1
    121.  
    122.     .sysmem          : > RAML3,     PAGE = 1
    123.  
    124. 	FFT_buffer1		: > RAML4,     PAGE = 1
    125. 	FFT_buffer2		: > RAML4,     PAGE = 1
    126. 	FFT_buffer3		: > RAML5,     PAGE = 1
    127. 	FFT_buffer4		: > RAML5,     PAGE = 1
    128.  
    129.    .cio             : > RAML3,     PAGE = 1
    130.    ZONE7DATA        : > ZONE7B,    PAGE = 1
    131.  
    132.    DMARAML4         : > RAML4,     PAGE = 1
    133.    DMARAML5         : > RAML5,     PAGE = 1
    134.  
    135.    .reset           : > RESET,     PAGE = 0, TYPE = DSECT /* not used                    */
    136.    csm_rsvd         : > CSM_RSVD   PAGE = 0, TYPE = DSECT /* not used for SARAM examples */
    137.    csmpasswds       : > CSM_PWL    PAGE = 0, TYPE = DSECT /* not used for SARAM examples */
    138.  
    139.    /* Allocate ADC_cal function (pre-programmed by factory into TI reserved memory) */
    140.    .adc_cal     : load = ADC_CAL,   PAGE = 0, TYPE = NOLOAD
    141.  
    142. }
    143.  
    144. /*
    145. //===========================================================================
    146. // End of file.
    147. //===========================================================================
    148. */

    main中调用   

    RFFT_ADC_Init();

    RFFT_ADC_Caculate();

    这两个函数即可完成测试。

    打开调试窗口

    rfft_analyse 加入调试窗口，点击运行即可看到计算结果

    可以看到成功把input.c采集到的数据通过FFT将各次不同频率的分量提取出来了，结果和我们上面输入信号很相近。（input.c输入信号数据可以通过matlab借助dsp库编写生成数据，可参考C2000Ware_4_01_00_00\libraries\dsp\FPU\c28\reference\MATLAB中的FPU_DSP_runIFFT.m进行编写）

    下图是相关程序的运行时间，1024点旋转因子表生成要650us(采样点数固定，该旋转因子表只需要生成一次)，FFT计算大概要200us。

     

     

     

     

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  • 原文地址：https://blog.csdn.net/qq_41495871/article/details/127806899