GD32F303之快速傅里叶变换

#include "dsp_fft.h"



float32_t test_out[1024];

float32_t test_in[2048];



void fft_test(void)

{

        u16 i;



        

        for(i=0;i<1024;i++)

        {

                test_in[i*2+1]=0;

                test_in[i*2]=arm_sin_f32(2*3.1415926*50*i/1000);

        }

        arm_cfft_f32(&arm_cfft_sR_f32_len1024,test_in,0,1);

        arm_cmplx_mag_f32(test_in,test_out,1024);

        for(i=0;i<1024;i++)

        {

                printf("%f\r\n",test_out[i]);

        }

}

/*

    昆明电器科学研究所 张恩寿 2019年5月3日

        

        

*/

#include "bitband.h"

#include "led_config.h"

#include "systick.h"

#include "usart.h"

#include "spi_flash.h"

#include "tft.h"

#include "key_lookup.h"

#include "dsp_fft.h"









int main(void)

{                        

        systick_config(120);

        nvic_priority_group_set(NVIC_PRIGROUP_PRE2_SUB2);

        usart0_init(115200);

    led_init();

        fft_test();

        

        while(1)

        {

                led_on();

                delay_nms(600);

                led_off();

                delay_nms(600);

        }

                

}

stm32=[1.705632

1.707621

1.713326

1.722719

1.735882

1.752857

1.773772

1.798508

1.827277

1.860163

1.897144

1.938122

1.983548

2.033568

2.088088

2.147741

2.212042

2.282177

2.357983

2.439880

2.528092

2.623763

2.726846

2.838429

2.959060

3.089876

3.231769

3.386125

3.554645

3.738804

3.940831

4.163391

4.409548

4.683141

4.989015

5.332843

5.721903

6.166427

6.678069

7.273537

7.975621

8.815111

9.837244

11.108480

12.732266

14.879780

17.852674

22.240526

29.369764

42.978416

79.265205

478.406281

120.296638

53.772808

34.764549

25.759335

20.505369

17.062328

14.631233

12.823098

11.425245

10.312147

9.404791

8.650594

8.014164

7.469474

6.998009

6.586292

6.223259

5.900481

5.611870

5.352154

5.117285

4.903747

4.708768

4.529855

4.365328

4.213433

4.072542

3.941772

3.819881

3.706118

3.599553

3.499597

3.405564

3.316926

3.233330

3.154626

3.079564

3.008623

2.941279

2.877166

2.816226

2.757876

2.702428

2.649343

2.598507

2.549876

2.503153

2.458415

2.415564

2.374239

2.334496

2.296287

2.259437

2.223906

2.189626

2.156370

2.124491

2.093456

2.063578

2.034624

2.006721

1.979478

1.953124

1.927659

1.902704

1.878604

1.855249

1.832461

1.810496

1.788850

1.767703

1.747423

1.727579

1.708428

1.689857

1.671444

1.653469

1.635973

1.618953

1.602362

1.586097

1.570187

1.554554

1.539359

1.524696

1.510090

1.495952

1.482038

1.468630

1.455292

1.442373

1.429402

1.416936

1.404837

1.392874

1.381115

1.369549

1.358197

1.347302

1.336454

1.325581

1.315329

1.304817

1.294665

1.284861

1.275251

1.265608

1.256245

1.247059

1.238021

1.229096

1.220244

1.211625

1.203201

1.195096

1.186803

1.178958

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1.163197

1.155283

1.147813

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1.133089

1.126058

1.118900

1.111673

1.105019

1.098120

1.091466

1.085091

1.078551

1.071986

1.065795

1.059625

1.053377

1.047395

1.041494

1.035593

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1.018570

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1.007612

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0.996941

0.991575

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0.725993

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0.697467

0.695514

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0.691697

0.689743

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0.686206

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0.682701

0.680823

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0.661024

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0.648990

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0.872332

0.875984

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0.907644

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1.071985

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1.085090

1.091463

1.098128

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11.425244

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14.631233

17.062326

20.505369

25.759335

34.764549

53.772816

120.296646

478.406219

79.265205

42.978424

29.369764

22.240528

17.852673

14.879777

12.732265

11.108480

9.837243

8.815109

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6.678069

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5.721903

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3.940831

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3.231769

3.089876

2.959060

2.838427

2.726846

2.623765

2.528092

2.439873

2.357983

2.282176

2.212042

2.147743

2.088089

2.033571

1.983547

1.938120

1.897144

1.860163

1.827277

1.798507

1.773772

1.752860

1.735882

1.722718

1.713326

1.707621

];

fs=1000;

N=1024;

n=0:N-1;

t=0:1/fs:1-1/fs;

f=n*fs/N;

x=2*sin(2*pi*50*t);

y=fft(x,N);

subplot(211)

plot(f,abs(y)),title('MATLAB计算结果'),xlabel('频率'),ylabel('幅值'),grid;

subplot(212)

plot(f,stm32),title('GD32F303计算结果'),xlabel('频率'),ylabel('幅值'),grid;