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：

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

MATLAB命令式文件：

%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
fs=1e5;             %设采样率为100K
f = [1e3,5e3,1e4];  %频率矩阵（1*N）测试信号频率为1K，5K，10K
phase = [0,0,0];    %初相位均为0
amp = [0.3,1.0,0.5];
N=512;              %采样点数y=mult_freq_signal_test(fs,f,N,amp,phase);y=reshape(y,[4,N/4]);
y=y';fileID = fopen('record.txt','w');
for i=1:1:N/4fprintf(fileID,'%.6f,%.6f,%.6f,%.6f,\n',y(i,1),y(i,2),y(i,3),y(i,4));
end
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：

//#############################################################################
//! \file   input.c
//! \brief  Input Vector (1024)
//! \author Vishal Coelho
//! \date   16-Sep-2016
//!
//
//  Group:          C2000
//  Target Family:  $DEVICE$
//
//#############################################################################
//
//
// $Copyright: Copyright (C) 2022 Texas Instruments Incorporated -
//             http://www.ti.com/ ALL RIGHTS RESERVED $
//#############################################################################
float test_input[512] = {0.000000,0.621747,1.100913,1.340760,1.319556,1.092705,0.767601,0.461223,0.256783,0.175872,0.176336,0.176103,0.093107,-0.114798,-0.426010,-0.757295,-0.991651,-1.021653,-0.791865,-0.323977,0.285317,0.893485,1.358000,1.582180,1.544357,1.300000,0.956572,0.631123,0.406943,0.305699,0.285317,0.263809,0.159191,-0.070597,-0.403866,-0.757295,-1.013795,-1.065855,-0.857949,-0.411682,0.176336,0.763658,1.207840,1.412279,1.355387,1.092705,0.731771,0.389703,0.149857,0.033962,0.000000,-0.033962,-0.149857,-0.389703,-0.731771,-1.092705,-1.355387,-1.412279,-1.207840,-0.763658,-0.176336,0.411682,0.857949,1.065855,1.013795,0.757295,0.403866,0.070597,-0.159191,-0.263809,-0.285317,-0.305699,-0.406943,-0.631123,-0.956572,-1.300000,-1.544357,-1.582180,-1.358000,-0.893485,-0.285317,0.323977,0.791865,1.021653,0.991651,0.757295,0.426010,0.114798,-0.093107,-0.176103,-0.176336,-0.175872,-0.256783,-0.461223,-0.767601,-1.092705,-1.319556,-1.340760,-1.100913,-0.621747,-0.000000,0.621747,1.100913,1.340760,1.319556,1.092705,0.767601,0.461223,0.256783,0.175872,0.176336,0.176103,0.093107,-0.114798,-0.426010,-0.757295,-0.991651,-1.021653,-0.791865,-0.323977,0.285317,0.893485,1.358000,1.582180,1.544357,1.300000,0.956572,0.631123,0.406943,0.305699,0.285317,0.263809,0.159191,-0.070597,-0.403866,-0.757295,-1.013795,-1.065855,-0.857949,-0.411682,0.176336,0.763658,1.207840,1.412279,1.355387,1.092705,0.731771,0.389703,0.149857,0.033962,0.000000,-0.033962,-0.149857,-0.389703,-0.731771,-1.092705,-1.355387,-1.412279,-1.207840,-0.763658,-0.176336,0.411682,0.857949,1.065855,1.013795,0.757295,0.403866,0.070597,-0.159191,-0.263809,-0.285317,-0.305699,-0.406943,-0.631123,-0.956572,-1.300000,-1.544357,-1.582180,-1.358000,-0.893485,-0.285317,0.323977,0.791865,1.021653,0.991651,0.757295,0.426010,0.114798,-0.093107,-0.176103,-0.176336,-0.175872,-0.256783,-0.461223,-0.767601,-1.092705,-1.319556,-1.340760,-1.100913,-0.621747,-0.000000,0.621747,1.100913,1.340760,1.319556,1.092705,0.767601,0.461223,0.256783,0.175872,0.176336,0.176103,0.093107,-0.114798,-0.426010,-0.757295,-0.991651,-1.021653,-0.791865,-0.323977,0.285317,0.893485,1.358000,1.582180,1.544357,1.300000,0.956572,0.631123,0.406943,0.305699,0.285317,0.263809,0.159191,-0.070597,-0.403866,-0.757295,-1.013795,-1.065855,-0.857949,-0.411682,0.176336,0.763658,1.207840,1.412279,1.355387,1.092705,0.731771,0.389703,0.149857,0.033962,0.000000,-0.033962,-0.149857,-0.389703,-0.731771,-1.092705,-1.355387,-1.412279,-1.207840,-0.763658,-0.176336,0.411682,0.857949,1.065855,1.013795,0.757295,0.403866,0.070597,-0.159191,-0.263809,-0.285317,-0.305699,-0.406943,-0.631123,-0.956572,-1.300000,-1.544357,-1.582180,-1.358000,-0.893485,-0.285317,0.323977,0.791865,1.021653,0.991651,0.757295,0.426010,0.114798,-0.093107,-0.176103,-0.176336,-0.175872,-0.256783,-0.461223,-0.767601,-1.092705,-1.319556,-1.340760,-1.100913,-0.621747,0.000000,0.621747,1.100913,1.340760,1.319556,1.092705,0.767601,0.461223,0.256783,0.175872,0.176336,0.176103,0.093107,-0.114798,-0.426010,-0.757295,-0.991651,-1.021653,-0.791865,-0.323977,0.285317,0.893485,1.358000,1.582180,1.544357,1.300000,0.956572,0.631123,0.406943,0.305699,0.285317,0.263809,0.159191,-0.070597,-0.403866,-0.757295,-1.013795,-1.065855,-0.857949,-0.411682,0.176336,0.763658,1.207840,1.412279,1.355387,1.092705,0.731771,0.389703,0.149857,0.033962,-0.000000,-0.033962,-0.149857,-0.389703,-0.731771,-1.092705,-1.355387,-1.412279,-1.207840,-0.763658,-0.176336,0.411682,0.857949,1.065855,1.013795,0.757295,0.403866,0.070597,-0.159191,-0.263809,-0.285317,-0.305699,-0.406943,-0.631123,-0.956572,-1.300000,-1.544357,-1.582180,-1.358000,-0.893485,-0.285317,0.323977,0.791865,1.021653,0.991651,0.757295,0.426010,0.114798,-0.093107,-0.176103,-0.176336,-0.175872,-0.256783,-0.461223,-0.767601,-1.092705,-1.319556,-1.340760,-1.100913,-0.621747,0.000000,0.621747,1.100913,1.340760,1.319556,1.092705,0.767601,0.461223,0.256783,0.175872,0.176336,0.176103,0.093107,-0.114798,-0.426010,-0.757295,-0.991651,-1.021653,-0.791865,-0.323977,0.285317,0.893485,1.358000,1.582180,1.544357,1.300000,0.956572,0.631123,0.406943,0.305699,0.285317,0.263809,0.159191,-0.070597,-0.403866,-0.757295,-1.013795,-1.065855,-0.857949,-0.411682,0.176336,0.763658,1.207840,1.412279,1.355387,1.092705,0.731771,0.389703,0.149857,0.033962,0.000000,-0.033962,-0.149857,-0.389703,-0.731771,-1.092705,-1.355387,-1.412279,-1.207840,-0.763658,-0.176336,0.411682,0.857949,1.065855,1.013795,0.757295,0.403866,0.070597,-0.159191,-0.263809,-0.285317,-0.305699,-0.406943,-0.631123,-0.956572,-1.300000,-1.544357,-1.582180,-1.358000,-0.893485,-0.285317,0.323977,0.791865,1.021653,0.991651,0.757295,0.426010,0.114798,-0.093107,-0.176103,-0.176336,-0.175872,-0.256783,-0.461223,-0.767601,-1.092705,-1.319556,-1.340760,-1.100913,-0.621747,0.000000,0.621747,1.100913,1.340760,1.319556,1.092705,0.767601,0.461223,0.256783,0.175872,0.176336,0.176103,};// 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：

/** Filter Coefficients (C Source) generated by the Filter Design and Analysis Tool* Generated by MATLAB(R) 9.11 and Signal Processing Toolbox 8.7.* Generated on: 13-Jan-2023 10:06:26*//** 离散时间 FIR 滤波器(实数)* ----------------* 滤波器结构  : 直接型 FIR* 滤波器长度  : 81* 稳定     : 是* 线性相位   : 是 (Type 1)*//* General type conversion for MATLAB generated C-code  */
#include "tmwtypes.h"
/* * Expected path to tmwtypes.h * E:\Program Files\MATLAB\R2021b\extern\include\tmwtypes.h */
/** Warning - Filter coefficients were truncated to fit specified data type.  *   The resulting response may not match generated theoretical response.*   Use the Filter Design & Analysis Tool to design accurate*   single-precision filter coefficients.*/
const int BL = 81;
const float coeffs[81] = {-0,-7.111737887e-06,-2.438249976e-05,-4.471002831e-05,-5.97600847e-05,-6.013489474e-05,-3.557757736e-05,2.479158684e-05,0.0001322122553,0.0002980003483,0.0005332503351, 0.000848530326, 0.001253577648, 0.001757002436, 0.002366006607,0.003086125944, 0.003921000753, 0.004872185644, 0.005938995164, 0.007118403912,0.008404986933, 0.009790921584,  0.01126603596,  0.01281791367,  0.01443205494,0.01609207876,  0.01777997613,  0.01947640628,  0.02116102912,  0.02281285636,0.02441063337,   0.0259332303,  0.02736003883,  0.02867136523,  0.02984880283,0.03087559529,   0.0317369625,  0.03242038563,  0.03291586414,  0.03321611136,0.03331669047,  0.03321611136,  0.03291586414,  0.03242038563,   0.0317369625,0.03087559529,  0.02984880283,  0.02867136523,  0.02736003883,   0.0259332303,0.02441063337,  0.02281285636,  0.02116102912,  0.01947640628,  0.01777997613,0.01609207876,  0.01443205494,  0.01281791367,  0.01126603596, 0.009790921584,0.008404986933, 0.007118403912, 0.005938995164, 0.004872185644, 0.003921000753,0.003086125944, 0.002366006607, 0.001757002436, 0.001253577648, 0.000848530326,0.0005332503351,0.0002980003483,0.0001322122553,2.479158684e-05,-3.557757736e-05,-6.013489474e-05,-5.97600847e-05,-4.471002831e-05,-2.438249976e-05,-7.111737887e-06,-0
};

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。

/** FIR.h**  Created on: 2023年1月12日*      Author: yang*/#ifndef APP_FIR_H_
#define APP_FIR_H_#include "DSP28x_Project.h"
#include <stdio.h>
#include <string.h>void FIR_Init(void);
void FIR_filter_run(void);#endif /* APP_FIR_H_ */

/** FIR.c**  Created on: 2023年1月12日*      Author: yang*/#include <FIR.h>
#include "dsp.h"
#include "fpu_filter.h"
#include <math.h>
#include "complex.h"
#include "fdacoefs.h"#define pi 3.14159
#define FIR_SIZE       (512U)
#define FIR_ORDER       (80U)             // ORDER = NUM_TAPS - 1，ORDER为滤波器阶数#pragma DATA_SECTION(coeffs, "FIR_buffer0");
#pragma DATA_SECTION(FIR_output, "FIR_buffer1");// FIR_f32 object
FIR_f32 fir;
// Handle to the FIR_f32 object
FIR_f32_Handle hnd_fir = &fir;// The filter coefficients are tacked on to the end of the
// MATLAB generated input// The delay line buffer
float delayLine[FIR_ORDER+1];float FIR_output[FIR_SIZE];extern float test_input[];
extern const float coeffs[];
//*****************************************************************************
// the function definitions
//*****************************************************************************
void FIR_Init(void)
{// Configure the objectFIR_f32_setCoefficientsPtr(hnd_fir, coeffs);FIR_f32_setDelayLinePtr(hnd_fir, delayLine);FIR_f32_setOrder(hnd_fir, FIR_ORDER);FIR_f32_setInitFunction(hnd_fir, (v_pfn_v)FIR_f32_init);FIR_f32_setCalcFunction(hnd_fir, (v_pfn_v)FIR_f32_calc);// Copy the coefficients from test input into the "coeffs" array//memcpy(&coeffs, &test_input[FIR_SIZE], (FIR_ORDER + 1U)*sizeof(float));// Run the initialization functionhnd_fir->init(hnd_fir);}void FIR_filter_run(void)
{// Localsuint16_t i;float32u_t in, out;for(i = 0U; i < FIR_SIZE; i++){in.f32   = test_input[i];out.f32  = FLT_MAX;FIR_f32_setInput(hnd_fir, in.f32);FIR_f32_setOutput(hnd_fir, out.f32);// Call the calculation routinehnd_fir->calc(hnd_fir);out.f32 = FIR_f32_getOutput(hnd_fir);FIR_output[i] = out.f32;}
}// End of File

cmd文件如下

/*
// TI File $Revision: /main/3 $
// Checkin $Date: July 9, 2008   14:12:45 $
//###########################################################################
//
// FILE:    28335_RAM_lnk.cmd
//
// TITLE:   Linker Command File For IQmath examples that run out of RAM
//
// NOTE; The example project uses memory protected by the
//       Code Security Module (CSM).  Make sure the CSM is
//       unlocked before you load the project.  One quick way
//       to do this on an erased device is to open a memory
//       window to the CSM password locations.  If these locations
//       read back 0xFFFF (or non-zero), then the CSM is unlocked:
//
//      Device    Password locations
//      28335:    0x33FFF8 - 0x33FFFF
//
//###########################################################################
//
//
// $Copyright: Copyright (C) 2014-2022 Texas Instruments Incorporated -
//             http://www.ti.com/ ALL RIGHTS RESERVED $
//###########################################################################
*/MEMORY
{
PAGE 0 :BEGIN      : origin = 0x000000, length = 0x000002     /* Boot to M0 will go here                      */BOOT_RSVD  : origin = 0x000002, length = 0x00004E     /* Part of M0, BOOT rom will use this for stack */RAML0      : origin = 0x008000, length = 0x000800RAML1L2    : origin = 0x008800, length = 0x004800ZONE7A     : origin = 0x200000, length = 0x00FC00    /* XINTF zone 7 - program space */FLASHH     : origin = 0x300000, length = 0x008000     /* on-chip FLASH */FLASHG     : origin = 0x308000, length = 0x008000     /* on-chip FLASH */FLASHF     : origin = 0x310000, length = 0x008000     /* on-chip FLASH */FLASHE     : origin = 0x318000, length = 0x008000     /* on-chip FLASH */FLASHD     : origin = 0x320000, length = 0x008000     /* on-chip FLASH */FLASHC     : origin = 0x328000, length = 0x008000     /* on-chip FLASH */FLASHA     : origin = 0x338000, length = 0x007F80     /* on-chip FLASH */CSM_RSVD   : origin = 0x33FF80, length = 0x000076     /* Part of FLASHA.  Program with all 0x0000 when CSM is in use. */CSM_PWL    : origin = 0x33FFF8, length = 0x000008     /* Part of FLASHA.  CSM password locations in FLASHA            */OTP         : origin = 0x380400, length = 0x000400     /* on-chip OTP */ADC_CAL    : origin = 0x380080, length = 0x000009IQTABLES    : origin = 0x3FE000, length = 0x000b50     /* IQ Math Tables in Boot ROM */IQTABLES2   : origin = 0x3FEB50, length = 0x00008c     /* IQ Math Tables in Boot ROM */FPUTABLES   : origin = 0x3FEBDC, length = 0x0006A0     /* FPU Tables in Boot ROM */ROM         : origin = 0x3FF27C, length = 0x000D44     /* Boot ROM */RESET      : origin = 0x3FFFC0, length = 0x000002VECTORS     : origin = 0x3FFFC2, length = 0x00003E     /* part of boot ROM  */PAGE 1 :BOOT_RSVD  : origin = 0x000002, length = 0x00004E     /* Part of M0, BOOT rom will use this for stack */RAMM0      : origin = 0x000050, length = 0x0003B0     /* on-chip RAM block M0 */RAMM1      : origin = 0x000400, length = 0x000400     /* on-chip RAM block M1 */RAML3      : origin = 0x00D000, length = 0x001000RAML4      : origin = 0x00E000, length = 0x001000RAML5      : origin = 0x00F000, length = 0x001000ZONE7B     : origin = 0x20FC00, length = 0x000400     /* XINTF zone 7 - data space */FLASHB     : origin = 0x330000, length = 0x008000     /* on-chip FLASH */}SECTIONS
{FPUmathTables    : > FPUTABLES, PAGE = 0, TYPE = NOLOAD/* Setup for "boot to SARAM" mode:The codestart section (found in DSP28_CodeStartBranch.asm)re-directs execution to the start of user code.  */codestart        : > BEGIN,     PAGE = 0#ifdef __TI_COMPILER_VERSION__#if __TI_COMPILER_VERSION__ >= 15009000.TI.ramfunc : {} LOAD = RAML0,RUN = RAML0,LOAD_START(_RamfuncsLoadStart),LOAD_END(_RamfuncsLoadEnd),RUN_START(_RamfuncsRunStart),LOAD_SIZE(_RamfuncsLoadSize),PAGE = 0#elseramfuncs       : LOAD = RAML0,RUN = RAML0,LOAD_START(_RamfuncsLoadStart),LOAD_END(_RamfuncsLoadEnd),RUN_START(_RamfuncsRunStart),LOAD_SIZE(_RamfuncsLoadSize),PAGE = 0#endif
#endif.text           : {*(.text)}>> RAML1L2|RAML0 PAGE = 0.cinit          : > RAML0,     PAGE = 0.pinit           : > RAML0,     PAGE = 0.switch          : > RAML0,     PAGE = 0.stack           : > RAMM1,     PAGE = 1.ebss            : > RAML3,     PAGE = 1.econst          : > RAML3,     PAGE = 1.sysmem          : > RAML3,     PAGE = 1.esysmem         : > RAML3,     PAGE = 1.sysmem          : > RAML3,     PAGE = 1FIR_buffer0        : > RAML4,     PAGE = 1FIR_buffer1      : > RAML5,     PAGE = 1.cio             : > RAML3,     PAGE = 1ZONE7DATA        : > ZONE7B,    PAGE = 1DMARAML4         : > RAML4,     PAGE = 1DMARAML5         : > RAML5,     PAGE = 1.reset           : > RESET,     PAGE = 0, TYPE = DSECT /* not used                    */csm_rsvd         : > CSM_RSVD   PAGE = 0, TYPE = DSECT /* not used for SARAM examples */csmpasswds       : > CSM_PWL    PAGE = 0, TYPE = DSECT /* not used for SARAM examples *//* Allocate ADC_cal function (pre-programmed by factory into TI reserved memory) */.adc_cal     : load = ADC_CAL,   PAGE = 0, TYPE = NOLOAD}/*
//===========================================================================
// End of file.
//===========================================================================
*/

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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