首先进入TI官网，搜索C2000 wave，进行下载安装。
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-1.png)
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）
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-2.png)
同时记得添加头文件路径
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-3.png)
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')
endMATLAB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/4
fprintf(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：
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-4.png)
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）。
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-5.png)
再点击目标，选择生成到CCS IDE中
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-6.png)
28335FPU为32位，故选择单精度浮点型
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-7.png)
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。
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-8.png)
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 object
FIR_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 function
hnd_fir->init(hnd_fir);
}
void FIR_filter_run(void)
{
// Locals
uint16_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 routine
hnd_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 = 0x000800
RAML1L2 : origin = 0x008800, length = 0x004800
ZONE7A : 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 = 0x000009
IQTABLES : 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 = 0x000002
VECTORS : 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 = 0x001000
RAML4 : origin = 0x00E000, length = 0x001000
RAML5 : origin = 0x00F000, length = 0x001000
ZONE7B : 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
#else
ramfuncs : 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 = 1
FIR_buffer0 : > RAML4, PAGE = 1
FIR_buffer1 : > RAML5, PAGE = 1
.cio : > RAML3, PAGE = 1
ZONE7DATA : > ZONE7B, PAGE = 1
DMARAML4 : > RAML4, PAGE = 1
DMARAML5 : > 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：
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-9.png)
滤波后信号：
![[DSP学习笔记]基于TMS320F28335的FIR滤波实现](https://imgs.yssmx.com/Uploads/2023/06/498713-10.png)
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博客文章来源：https://www.toymoban.com/news/detail-498713.html
[2]https://blog.csdn.net/weixin_42216236/article/details/127375580文章来源地址https://www.toymoban.com/news/detail-498713.html
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