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[DSP学习笔记]基于TMS320F28335的FIR滤波实现

2023-06-25

the page chip
首先进入TI官网，搜索C2000wave，进行下载安装。安装完成后，在2000wave的安装目录下，进入以下目录：C2000Ware_4_02_00_00\libraries\dsp\FPU\c28以我本地的安装目录为例：E:\ti\c2000\C2000Ware_4_02_00_00\librar

首先进入TI官网，搜索C2000 wave，进行下载安装。

安装完成后，在2000 wave的安装目录下，进入以下目录：C2000Ware_4_02_00_00\libraries\dsp\FPU\c28

以我本地的安装目录为例：E:\ti\c2000\C2000Ware_4_02_00_00\libraries\dsp\FPU\c28

复制include、source文件夹到新建工程中。再根据选用的DSP型号对文件夹内容进行删减。如：我使用的是TMS320F28335,FPU是32位的，故仅保留include、source文件夹中的fpu32文件夹以及dsp.h头文件。

工程中，可以见有以下文件（仅进行滤波可删除FFT相关文件）

同时记得添加头文件路径

 至此，对于我们进行滤波所需的函数库已经移植完毕。

测试部分：

首先使用MATLAB生成输入信号。

 MATLAB函数式文件：

  1. %生成固定点数固定频率的正弦信号
  2. %fs为采样率
  3. %f为多频信号频率
  4. %N为采样点数
  5. %amp为信号幅值
  6. %phase为信号初相位
  7. function [input,t] = mult_freq_signal_test(fs,f,N,amp,phase)
  8.     dt = 1/fs;        %采样周期
  9.     t = dt*N;         %采样时间
  10.     temp = (0:dt:(N-1)*dt)';
  11.     y = amp.*sin(2*pi*f.*temp+phase/180*pi);
  12.     Num = size(f,2);    %获取f频率个数
  13.     input = y*ones(Num,1);
  14.     subplot(1,2,1);
  15.     plot(temp/dt,input);
  16.     title('信号时域');
  17.     xlabel('点数 N');ylabel('幅值 A');
  18.     subplot(1,2,2);
  19.     Y = fftshift(fft(input));%做傅里叶变换并把零频点移到频谱中心
  20.     F = (-N/2:N/2-1)*(fs/N);%设置横坐标
  21.     plot(F,abs(Y)/max(abs(Y)));
  22.     title('信号频域');
  23.     xlabel('频率 f');ylabel('幅值 A')
  24. end

 MATLAB命令式文件：

  1. %与mult_freq_signal_test.m函数式文件配合使用，将生成的输出信号保存到本地
  2. fs=1e5;             %设采样率为100K
  3. f = [1e3,5e3,1e4];  %频率矩阵（1*N）测试信号频率为1K，5K，10K
  4. phase = [0,0,0];    %初相位均为0
  5. amp = [0.3,1.0,0.5];
  6. N=512;              %采样点数
  7.  
  8. y=mult_freq_signal_test(fs,f,N,amp,phase);
  9.  
  10. y=reshape(y,[4,N/4]);
  11. y=y';
  12.  
  13. fileID = fopen('record.txt','w');
  14. for i=1:1:N/4
  15.     fprintf(fileID,'%.6f,%.6f,%.6f,%.6f,\n',y(i,1),y(i,2),y(i,3),y(i,4));
  16. end
  17. fclose(fileID);%将生成的初始信号保存到.m文件路径下的record.txt

生成波形如下的输入信号：

 将record.txt文件内容复制到INPUT.c文件中，如下：

  1. //#############################################################################
  2. //! \file   input.c
  3. //! \brief  Input Vector (1024) 
  4. //! \author Vishal Coelho 
  5. //! \date   16-Sep-2016
  6. //! 
  7. //
  8. //  Group:          C2000
  9. //  Target Family:  $DEVICE$
  10. //
  11. //#############################################################################
  12. //
  13. //
  14. // $Copyright: Copyright (C) 2022 Texas Instruments Incorporated -
  15. //             http://www.ti.com/ ALL RIGHTS RESERVED $
  16. //#############################################################################
  17. float test_input[512] = {
  18.                          0.000000,0.621747,1.100913,1.340760,
  19.                          1.319556,1.092705,0.767601,0.461223,
  20.                          0.256783,0.175872,0.176336,0.176103,
  21.                          0.093107,-0.114798,-0.426010,-0.757295,
  22.                          -0.991651,-1.021653,-0.791865,-0.323977,
  23.                          0.285317,0.893485,1.358000,1.582180,
  24.                          1.544357,1.300000,0.956572,0.631123,
  25.                          0.406943,0.305699,0.285317,0.263809,
  26.                          0.159191,-0.070597,-0.403866,-0.757295,
  27.                          -1.013795,-1.065855,-0.857949,-0.411682,
  28.                          0.176336,0.763658,1.207840,1.412279,
  29.                          1.355387,1.092705,0.731771,0.389703,
  30.                          0.149857,0.033962,0.000000,-0.033962,
  31.                          -0.149857,-0.389703,-0.731771,-1.092705,
  32.                          -1.355387,-1.412279,-1.207840,-0.763658,
  33.                          -0.176336,0.411682,0.857949,1.065855,
  34.                          1.013795,0.757295,0.403866,0.070597,
  35.                          -0.159191,-0.263809,-0.285317,-0.305699,
  36.                          -0.406943,-0.631123,-0.956572,-1.300000,
  37.                          -1.544357,-1.582180,-1.358000,-0.893485,
  38.                          -0.285317,0.323977,0.791865,1.021653,
  39.                          0.991651,0.757295,0.426010,0.114798,
  40.                          -0.093107,-0.176103,-0.176336,-0.175872,
  41.                          -0.256783,-0.461223,-0.767601,-1.092705,
  42.                          -1.319556,-1.340760,-1.100913,-0.621747,
  43.                          -0.000000,0.621747,1.100913,1.340760,
  44.                          1.319556,1.092705,0.767601,0.461223,
  45.                          0.256783,0.175872,0.176336,0.176103,
  46.                          0.093107,-0.114798,-0.426010,-0.757295,
  47.                          -0.991651,-1.021653,-0.791865,-0.323977,
  48.                          0.285317,0.893485,1.358000,1.582180,
  49.                          1.544357,1.300000,0.956572,0.631123,
  50.                          0.406943,0.305699,0.285317,0.263809,
  51.                          0.159191,-0.070597,-0.403866,-0.757295,
  52.                          -1.013795,-1.065855,-0.857949,-0.411682,
  53.                          0.176336,0.763658,1.207840,1.412279,
  54.                          1.355387,1.092705,0.731771,0.389703,
  55.                          0.149857,0.033962,0.000000,-0.033962,
  56.                          -0.149857,-0.389703,-0.731771,-1.092705,
  57.                          -1.355387,-1.412279,-1.207840,-0.763658,
  58.                          -0.176336,0.411682,0.857949,1.065855,
  59.                          1.013795,0.757295,0.403866,0.070597,
  60.                          -0.159191,-0.263809,-0.285317,-0.305699,
  61.                          -0.406943,-0.631123,-0.956572,-1.300000,
  62.                          -1.544357,-1.582180,-1.358000,-0.893485,
  63.                          -0.285317,0.323977,0.791865,1.021653,
  64.                          0.991651,0.757295,0.426010,0.114798,
  65.                          -0.093107,-0.176103,-0.176336,-0.175872,
  66.                          -0.256783,-0.461223,-0.767601,-1.092705,
  67.                          -1.319556,-1.340760,-1.100913,-0.621747,
  68.                          -0.000000,0.621747,1.100913,1.340760,
  69.                          1.319556,1.092705,0.767601,0.461223,
  70.                          0.256783,0.175872,0.176336,0.176103,
  71.                          0.093107,-0.114798,-0.426010,-0.757295,
  72.                          -0.991651,-1.021653,-0.791865,-0.323977,
  73.                          0.285317,0.893485,1.358000,1.582180,
  74.                          1.544357,1.300000,0.956572,0.631123,
  75.                          0.406943,0.305699,0.285317,0.263809,
  76.                          0.159191,-0.070597,-0.403866,-0.757295,
  77.                          -1.013795,-1.065855,-0.857949,-0.411682,
  78.                          0.176336,0.763658,1.207840,1.412279,
  79.                          1.355387,1.092705,0.731771,0.389703,
  80.                          0.149857,0.033962,0.000000,-0.033962,
  81.                          -0.149857,-0.389703,-0.731771,-1.092705,
  82.                          -1.355387,-1.412279,-1.207840,-0.763658,
  83.                          -0.176336,0.411682,0.857949,1.065855,
  84.                          1.013795,0.757295,0.403866,0.070597,
  85.                          -0.159191,-0.263809,-0.285317,-0.305699,
  86.                          -0.406943,-0.631123,-0.956572,-1.300000,
  87.                          -1.544357,-1.582180,-1.358000,-0.893485,
  88.                          -0.285317,0.323977,0.791865,1.021653,
  89.                          0.991651,0.757295,0.426010,0.114798,
  90.                          -0.093107,-0.176103,-0.176336,-0.175872,
  91.                          -0.256783,-0.461223,-0.767601,-1.092705,
  92.                          -1.319556,-1.340760,-1.100913,-0.621747,
  93.                          0.000000,0.621747,1.100913,1.340760,
  94.                          1.319556,1.092705,0.767601,0.461223,
  95.                          0.256783,0.175872,0.176336,0.176103,
  96.                          0.093107,-0.114798,-0.426010,-0.757295,
  97.                          -0.991651,-1.021653,-0.791865,-0.323977,
  98.                          0.285317,0.893485,1.358000,1.582180,
  99.                          1.544357,1.300000,0.956572,0.631123,
  100.                          0.406943,0.305699,0.285317,0.263809,
  101.                          0.159191,-0.070597,-0.403866,-0.757295,
  102.                          -1.013795,-1.065855,-0.857949,-0.411682,
  103.                          0.176336,0.763658,1.207840,1.412279,
  104.                          1.355387,1.092705,0.731771,0.389703,
  105.                          0.149857,0.033962,-0.000000,-0.033962,
  106.                          -0.149857,-0.389703,-0.731771,-1.092705,
  107.                          -1.355387,-1.412279,-1.207840,-0.763658,
  108.                          -0.176336,0.411682,0.857949,1.065855,
  109.                          1.013795,0.757295,0.403866,0.070597,
  110.                          -0.159191,-0.263809,-0.285317,-0.305699,
  111.                          -0.406943,-0.631123,-0.956572,-1.300000,
  112.                          -1.544357,-1.582180,-1.358000,-0.893485,
  113.                          -0.285317,0.323977,0.791865,1.021653,
  114.                          0.991651,0.757295,0.426010,0.114798,
  115.                          -0.093107,-0.176103,-0.176336,-0.175872,
  116.                          -0.256783,-0.461223,-0.767601,-1.092705,
  117.                          -1.319556,-1.340760,-1.100913,-0.621747,
  118.                          0.000000,0.621747,1.100913,1.340760,
  119.                          1.319556,1.092705,0.767601,0.461223,
  120.                          0.256783,0.175872,0.176336,0.176103,
  121.                          0.093107,-0.114798,-0.426010,-0.757295,
  122.                          -0.991651,-1.021653,-0.791865,-0.323977,
  123.                          0.285317,0.893485,1.358000,1.582180,
  124.                          1.544357,1.300000,0.956572,0.631123,
  125.                          0.406943,0.305699,0.285317,0.263809,
  126.                          0.159191,-0.070597,-0.403866,-0.757295,
  127.                          -1.013795,-1.065855,-0.857949,-0.411682,
  128.                          0.176336,0.763658,1.207840,1.412279,
  129.                          1.355387,1.092705,0.731771,0.389703,
  130.                          0.149857,0.033962,0.000000,-0.033962,
  131.                          -0.149857,-0.389703,-0.731771,-1.092705,
  132.                          -1.355387,-1.412279,-1.207840,-0.763658,
  133.                          -0.176336,0.411682,0.857949,1.065855,
  134.                          1.013795,0.757295,0.403866,0.070597,
  135.                          -0.159191,-0.263809,-0.285317,-0.305699,
  136.                          -0.406943,-0.631123,-0.956572,-1.300000,
  137.                          -1.544357,-1.582180,-1.358000,-0.893485,
  138.                          -0.285317,0.323977,0.791865,1.021653,
  139.                          0.991651,0.757295,0.426010,0.114798,
  140.                          -0.093107,-0.176103,-0.176336,-0.175872,
  141.                          -0.256783,-0.461223,-0.767601,-1.092705,
  142.                          -1.319556,-1.340760,-1.100913,-0.621747,
  143.                          0.000000,0.621747,1.100913,1.340760,
  144.                          1.319556,1.092705,0.767601,0.461223,
  145.                          0.256783,0.175872,0.176336,0.176103,
  146.  
  147.      };
  148.  
  149.  
  150. // End of File

借助MATLAB自带的滤波器设计工具filter designer，生成滤波器系数（滤波器截止频率选择1500Hz，滤除高频噪声，指定阶数为80阶）。

 再点击目标，选择生成到CCS IDE中

28335FPU为32位，故选择单精度浮点型 

 

 点击生成到CCS新建工程中即可。

生成的fadcoefs.h如下：

  1. /*
  2.  * Filter Coefficients (C Source) generated by the Filter Design and Analysis Tool
  3.  * Generated by MATLAB(R) 9.11 and Signal Processing Toolbox 8.7.
  4.  * Generated on: 13-Jan-2023 10:06:26
  5.  */
  6.  
  7. /*
  8.  * 离散时间 FIR 滤波器(实数)
  9.  * ----------------
  10.  * 滤波器结构  : 直接型 FIR
  11.  * 滤波器长度  : 81
  12.  * 稳定     : 是
  13.  * 线性相位   : 是 (Type 1)
  14.  */
  15.  
  16. /* General type conversion for MATLAB generated C-code  */
  17. #include "tmwtypes.h"
  18. /* 
  19.  * Expected path to tmwtypes.h 
  20.  * E:\Program Files\MATLAB\R2021b\extern\include\tmwtypes.h 
  21.  */
  22. /*
  23.  * Warning - Filter coefficients were truncated to fit specified data type.  
  24.  *   The resulting response may not match generated theoretical response.
  25.  *   Use the Filter Design & Analysis Tool to design accurate
  26.  *   single-precision filter coefficients.
  27.  */
  28. const int BL = 81;
  29. const float coeffs[81] = {
  30.                -0,-7.111737887e-06,-2.438249976e-05,-4.471002831e-05,-5.97600847e-05,
  31.   -6.013489474e-05,-3.557757736e-05,2.479158684e-05,0.0001322122553,0.0002980003483,
  32.   0.0005332503351, 0.000848530326, 0.001253577648, 0.001757002436, 0.002366006607,
  33.    0.003086125944, 0.003921000753, 0.004872185644, 0.005938995164, 0.007118403912,
  34.    0.008404986933, 0.009790921584,  0.01126603596,  0.01281791367,  0.01443205494,
  35.     0.01609207876,  0.01777997613,  0.01947640628,  0.02116102912,  0.02281285636,
  36.     0.02441063337,   0.0259332303,  0.02736003883,  0.02867136523,  0.02984880283,
  37.     0.03087559529,   0.0317369625,  0.03242038563,  0.03291586414,  0.03321611136,
  38.     0.03331669047,  0.03321611136,  0.03291586414,  0.03242038563,   0.0317369625,
  39.     0.03087559529,  0.02984880283,  0.02867136523,  0.02736003883,   0.0259332303,
  40.     0.02441063337,  0.02281285636,  0.02116102912,  0.01947640628,  0.01777997613,
  41.     0.01609207876,  0.01443205494,  0.01281791367,  0.01126603596, 0.009790921584,
  42.    0.008404986933, 0.007118403912, 0.005938995164, 0.004872185644, 0.003921000753,
  43.    0.003086125944, 0.002366006607, 0.001757002436, 0.001253577648, 0.000848530326,
  44.   0.0005332503351,0.0002980003483,0.0001322122553,2.479158684e-05,-3.557757736e-05,
  45.   -6.013489474e-05,-5.97600847e-05,-4.471002831e-05,-2.438249976e-05,-7.111737887e-06,
  46.                -0
  47. };

需注意，生成的fadcoefs.h文件需包含tmwtypes.h文件

在生成的fadcoefs.h中包含tmwtypes.h的文件路径，将其添加到工程头文件路径即可。

 至此已完成了大部分准备工作，接下来开始编写函数进行滤波操作。

仿照TI官方例程，完成了以下函数的编写。

  1. /*
  2.  * FIR.h
  3.  *
  4.  *  Created on: 2023年1月12日
  5.  *      Author: yang
  6.  */
  7.  
  8. #ifndef APP_FIR_H_
  9. #define APP_FIR_H_
  10.  
  11. #include "DSP28x_Project.h"
  12. #include <stdio.h>
  13. #include <string.h>
  14.  
  15. void FIR_Init(void);
  16. void FIR_filter_run(void);
  17.  
  18.  
  19. #endif /* APP_FIR_H_ */
  1. /*
  2.  * FIR.c
  3.  *
  4.  *  Created on: 2023年1月12日
  5.  *      Author: yang
  6.  */
  7.  
  8.  
  9. #include <FIR.h>
  10. #include "dsp.h"
  11. #include "fpu_filter.h"
  12. #include <math.h>
  13. #include "complex.h"
  14. #include "fdacoefs.h"
  15.  
  16. #define pi 3.14159
  17. #define FIR_SIZE       (512U)
  18. #define FIR_ORDER       (80U)             // ORDER = NUM_TAPS - 1，ORDER为滤波器阶数
  19.  
  20. #pragma DATA_SECTION(coeffs, "FIR_buffer0");
  21. #pragma DATA_SECTION(FIR_output, "FIR_buffer1");
  22.  
  23. // FIR_f32 object
  24. FIR_f32 fir;
  25. // Handle to the FIR_f32 object
  26. FIR_f32_Handle hnd_fir = &fir;
  27.  
  28. // The filter coefficients are tacked on to the end of the
  29. // MATLAB generated input
  30.  
  31. // The delay line buffer
  32. float delayLine[FIR_ORDER+1];
  33.  
  34. float FIR_output[FIR_SIZE];
  35.  
  36. extern float test_input[];
  37. extern const float coeffs[];
  38. //*****************************************************************************
  39. // the function definitions
  40. //*****************************************************************************
  41. void FIR_Init(void)
  42. {
  43.     // Configure the object
  44.     FIR_f32_setCoefficientsPtr(hnd_fir, coeffs);
  45.     FIR_f32_setDelayLinePtr(hnd_fir, delayLine);
  46.     FIR_f32_setOrder(hnd_fir, FIR_ORDER);
  47.     FIR_f32_setInitFunction(hnd_fir, (v_pfn_v)FIR_f32_init);
  48.     FIR_f32_setCalcFunction(hnd_fir, (v_pfn_v)FIR_f32_calc);
  49.  
  50.     // Copy the coefficients from test input into the "coeffs" array
  51.     //memcpy(&coeffs, &test_input[FIR_SIZE], (FIR_ORDER + 1U)*sizeof(float));
  52.  
  53.     // Run the initialization function
  54.     hnd_fir->init(hnd_fir);
  55.  
  56. }
  57.  
  58. void FIR_filter_run(void)
  59. {
  60.     // Locals
  61.     uint16_t i;
  62.     float32u_t in, out;
  63.  
  64.     for(i = 0U; i < FIR_SIZE; i++)
  65.     {
  66.         in.f32   = test_input[i];
  67.         out.f32  = FLT_MAX;
  68.         FIR_f32_setInput(hnd_fir, in.f32);
  69.         FIR_f32_setOutput(hnd_fir, out.f32);
  70.  
  71.         // Call the calculation routine
  72.         hnd_fir->calc(hnd_fir);
  73.  
  74.         out.f32 = FIR_f32_getOutput(hnd_fir);
  75.         FIR_output[i] = out.f32;
  76.     }
  77. }
  78.  
  79. // End of File
  80.  
  81.  
  82.  
  83.  
  84.  
  85.  
  86.  
  87.  
  88.

cmd文件如下

  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. FIR_buffer0: > RAML4,     PAGE = 1
  125. FIR_buffer1: > RAML5,     PAGE = 1
  126.  
  127.  
  128.    .cio             : > RAML3,     PAGE = 1
  129.    ZONE7DATA        : > ZONE7B,    PAGE = 1
  130.  
  131.    DMARAML4         : > RAML4,     PAGE = 1
  132.    DMARAML5         : > RAML5,     PAGE = 1
  133.  
  134.    .reset           : > RESET,     PAGE = 0, TYPE = DSECT /* not used                    */
  135.    csm_rsvd         : > CSM_RSVD   PAGE = 0, TYPE = DSECT /* not used for SARAM examples */
  136.    csmpasswds       : > CSM_PWL    PAGE = 0, TYPE = DSECT /* not used for SARAM examples */
  137.  
  138.    /* Allocate ADC_cal function (pre-programmed by factory into TI reserved memory) */
  139.    .adc_cal     : load = ADC_CAL,   PAGE = 0, TYPE = NOLOAD
  140.  
  141. }
  142.  
  143. /*
  144. //===========================================================================
  145. // End of file.
  146. //===========================================================================
  147. */

再在主函数中调用FIR_Init(); FIR_filter_run();函数即可完成滤波操作。

借助CCS的Graph画图工具测试滤波效果如下：

原始信号：

滤波后信号：

测试结束，完成了FIR滤波。

本人为TMS320F28335学习小白，如有错误，请大佬多多指正。

本文参考了以下文章：​​​​​​

[1]TMS320F28335调用官方库进行FFT频谱分析_PeepFuture橙子的博客-CSDN博客

[2]https://blog.csdn.net/weixin_42216236/article/details/127375580

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