dsp--tms320f2812的快速傅立叶变换fft程序

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1、/^*^*^*^*^*^*^*^*^*^^j^P2812fftTI^J^§********************//**//*fft.c*//**//•if•if•if•if•if•if<1^*£>‘1冰<1^<1^<1^^ff/j^T、^T、^T、^T、^T、^T、^T、^T、^T、■/*FastFourierTransform(FFT).Using8points，takesabout1.2mstoexecuteoneFFT.SetsupGeneralPurposeTimer1togenerateev

2、entsat10kHz.Willproduce10kHzoutputonT1PWMandTlPWMpins.*/^includeHsystem.hH#include"eva.h"includeHio2407.hHincludenadc.h”#includeMinterrup.hM#include’’fftcmplx.h”/*Complexstructuredefinition*/externvoidFFT(COMPLEX*Y，intN);/*FFTfunction*//*Thefollowingdefinegivesthenum

3、berofsamples.*//*Itshoulddivideexactlyinto512*//*ShouldNbeincreased，tosayto32,thentheexecution*//*timeoftheFFTwouldincrease*/#defineN8unsignedintperform_fft=0;/*Flagdrivenbyinterrupt*//•if•if•if•if<1^‘1冰<1^<1^<1^<1^/itInitialiseGeneralPurposeTimersGPT1andGPT2*//tlf*1

4、?tlf/>*^Z、^Z、^Z、^T1*f/*InitialiseGeneralPurposeTimer1.*/voidinit_GPTl(void){MCRA

5、=T1PWM;/*TurnonT1PWM*/T1CON=0x8142;/*TurnoffGPTl*/GPTCONA=0x0041;/*Activelow.*/T1PR=1475;/*Sampleat10kHz*/T1CMPR=0;/*Duty=0%*/T1CNT=OxFFFE;/*Setto-2*/T1CON=0x9142;/*Starttimer1*/EVA1FRA=

6、OxFFFF;/*Clearanypendinginterrupts*/EVAIMRA

7、=T1PINT_FLAG;/*EnableTlperiodinterrupt*/}/*InitialiseGeneralPurposeTimer2*/voidinit_GPT2(void)MCRA

8、=T2PWM;/*TurnonT2PWM*/T2CON=0x8142;/*TurnoffGPT2*/GPTCONA

9、=0x0008;/*ControlledfromGPT1*/T2PR=1475;/*Sampleat10kHz*/T2CMPR=0;

10、/*Dutycycle0%decimal*/T2CNT=OxFFFE;/*Setto-2*/T2CON=0x9142;/*Starttimer2*/}/•丄••I*•I**1^•丄••!**1**1^•!＞•!＞*1*•!＞*1^•!*•!＞•!＞•又扇•又扇•又扇/f*T*/voidinit_ADC()/*NonCascadefor8measurements.*//*WillaffectRESULT0toRESULT7only*/ADCCTRLl=(ADC_SOFT

11、ADC_CPS/*

12、ADC_ACQ_PS3

13、ADC_ACQ_

14、PS2*/);CHSELSEQ1=0x3210;/*8measurements0*/CHSELSEQ2=0x0000;CHSELSEQ3=OxFFFF;CHSELSEQ4=OxFFFF;MAX_CONV=0x0007;/*8measurements，not0*//*Resetsequenceatzeroandsoftwarestartofconversion*/ADCCTRL2=(RST_SEQ1

15、SOC_SEQ1);}/*Nosemicolonhere*/intinput_buffer[N]={8191，8191，8191，8

16、191，0,0,0,0};COMPLEXyfNl;/*variablepassedtoFFTandmodified*/i<1#/7，J，，J，<7*rprp，I*，I**<*，J*<7*，I**>*，J*rj%，J，rj，，J，，J，rj，，J，rj，，J，^J