首先進(jìn)入TI官網(wǎng)，搜索C2000 wave，進(jìn)行下載安裝。

安裝完成后，在2000 wave的安裝目錄下，進(jìn)入以下目錄：C2000Ware_4_02_00_00\libraries\dsp\FPU\c28

以我本地的安裝目錄為例：E:\ti\c2000\C2000Ware_4_02_00_00\libraries\dsp\FPU\c28

復(fù)制include、source文件夾到新建工程中。再根據(jù)選用的DSP型號(hào)對(duì)文件夾內(nèi)容進(jìn)行刪減。如：我使用的是TMS320F28335,FPU是32位的，故僅保留include、source文件夾中的fpu32文件夾以及dsp.h頭文件。

工程中，可以見(jiàn)有以下文件（僅進(jìn)行濾波可刪除FFT相關(guān)文件）

同時(shí)記得添加頭文件路徑

?至此，對(duì)于我們進(jìn)行濾波所需的函數(shù)庫(kù)已經(jīng)移植完畢。

測(cè)試部分：

首先使用MATLAB生成輸入信號(hào)。

?MATLAB函數(shù)式文件：

%生成固定點(diǎn)數(shù)固定頻率的正弦信號(hào) %fs為采樣率 %f為多頻信號(hào)頻率 %N為采樣點(diǎn)數(shù) %amp為信號(hào)幅值 %phase為信號(hào)初相位 function [input,t] = mult_freq_signal_test(fs,f,N,amp,phase)dt = 1/fs; %采樣周期t = dt*N; %采樣時(shí)間temp = (0:dt:(N-1)*dt)';y = amp.*sin(2*pi*f.*temp+phase/180*pi);Num = size(f,2); %獲取f頻率個(gè)數(shù)input = y*ones(Num,1);subplot(1,2,1);plot(temp/dt,input);title('信號(hào)時(shí)域');xlabel('點(diǎn)數(shù) N');ylabel('幅值 A');subplot(1,2,2);Y = fftshift(fft(input));%做傅里葉變換并把零頻點(diǎn)移到頻譜中心F = (-N/2:N/2-1)*(fs/N);%設(shè)置橫坐標(biāo)plot(F,abs(Y)/max(abs(Y)));title('信號(hào)頻域');xlabel('頻率 f');ylabel('幅值 A') end

?MATLAB命令式文件：

%與mult_freq_signal_test.m函數(shù)式文件配合使用，將生成的輸出信號(hào)保存到本地 fs=1e5; %設(shè)采樣率為100K f = [1e3,5e3,1e4]; %頻率矩陣（1*N）測(cè)試信號(hào)頻率為1K，5K，10K phase = [0,0,0]; %初相位均為0 amp = [0.3,1.0,0.5]; N=512; %采樣點(diǎn)數(shù)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);%將生成的初始信號(hào)保存到.m文件路徑下的record.txt

生成波形如下的輸入信號(hào)：

?將record.txt文件內(nèi)容復(fù)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自帶的濾波器設(shè)計(jì)工具filter designer，生成濾波器系數(shù)（濾波器截止頻率選擇1500Hz，濾除高頻噪聲，指定階數(shù)為80階）。

?再點(diǎn)擊目標(biāo)，選擇生成到CCS IDE中

28335FPU為32位，故選擇單精度浮點(diǎn)型?

?點(diǎn)擊生成到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*//** 離散時(shí)間 FIR 濾波器(實(shí)數(shù))* ----------------* 濾波器結(jié)構(gòu) : 直接型 FIR* 濾波器長(zhǎng)度 : 81* 穩(wěn)定 : 是* 線性相位 : 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的文件路徑，將其添加到工程頭文件路徑即可。

?至此已完成了大部分準(zhǔn)備工作，接下來(lái)開(kāi)始編寫(xiě)函數(shù)進(jìn)行濾波操作。

仿照TI官方例程，完成了以下函數(shù)的編寫(xiě)。

/** 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為濾波器階數(shù)#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. //=========================================================================== */

再在主函數(shù)中調(diào)用FIR_Init(); FIR_filter_run();函數(shù)即可完成濾波操作。

借助CCS的Graph畫(huà)圖工具測(cè)試濾波效果如下：

原始信號(hào)：

濾波后信號(hào)：

測(cè)試結(jié)束，完成了FIR濾波。

本人為T(mén)MS320F28335學(xué)習(xí)小白，如有錯(cuò)誤，請(qǐng)大佬多多指正。

本文參考了以下文章：??????

[1]TMS320F28335調(diào)用官方庫(kù)進(jìn)行FFT頻譜分析_PeepFuture橙子的博客-CSDN博客

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

總結(jié)

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