基于DSP2812的SVPWM波形实现程序(共6页)

1、精选优质文档-倾情为你奉上基于DSP2812的SVPWM波形实现程序 / file name: svpwm.c/generate svpwm waveforms#include "math.h"#include "DSP281x_Device.h" / DSP281x Headerfile Include File#include "DSP281x_Examples.h"#include <stdio.h> / DSP281x Examples Include File/global variablesfloat Tz=2

2、e-4;int Vdc=600;/float PI=3.1415;/int f=50;/ Prototype statements for functions found in this file.void svpwm(float *ptr,float uapha,float ubeta,float Tswitch,int vdc_link);void init_eva(void);void main(void)float cmpr3=0,0,0;/cmpr3=CMPR1,CMPR2,CMPR3)float *ptrc=&cmpr0;/point to the addrs of cmp

3、rfloat v_aphar=100;/reference value of vapharfloat v_betar=-20;/reference value of vbetar/float tstep=0.;/float tend=5/float w=2*PI*f;/float y=sin(w*t);/ Step 1. Initialize System Control:/ PLL-30MHz*10/2, disable WatchDog, enable Peripheral Clocks/ This example function is found in the DSP281x_SysC

4、trl.c file. InitSysCtrl();/ Step 2. Initalize GPIO: / This example function is found in the DSP281x_Gpio.c file and/ illustrates how to set the GPIO to it's default state.InitGpio();/ Step 3. Clear all interrupts and initialize PIE vector table:/ Disable CPU interrupts DINT; /asm(" setc INT

5、M")/ Initialize the PIE control registers to their default state./ The default state is all PIE interrupts disabled and flags/ are cleared. / This function is found in the DSP281x_PieCtrl.c file. /InitPieCtrl(); / Disable CPU interrupts and clear all CPU interrupt flags: IER = 0x0000; IFR = 0x0

6、000;/ Initialize the PIE vector table with pointers to the shell Interrupt / Service Routines (ISR). / This will populate the entire table, even if the interrupt/ is not used in this example. This is useful for debug purposes./ The shell ISR routines are found in DSP281x_DefaultIsr.c./ This function

7、 is found in DSP281x_PieVect.c./ InitPieVectTable(); init_eva();svpwm(ptrc,v_aphar,v_betar,Tz,Vdc); EvaRegs.CMPR1 = cmpr0*75e6;EvaRegs.CMPR2 = cmpr1*75e6;EvaRegs.CMPR3 = cmpr2*75e6;/*/function: svpwm/discription: /*void svpwm(float *ptr,float uapha,float ubeta,float Tswitch,int vdc_link)int A,B,C,N;

8、double X,Y,Z,Tx,Ty,T0,Tl,Tm,Th;if (ubeta>0) A = 1;else A=0; if (1.*uapha-ubeta)>0) B = 1;else B=0;if (-1.*uapha-ubeta)>0) C = 1;else C=0;N=A+2*B+4*C;X=1.*ubeta*Tswitch/vdc_link;Y=(0.8660*ubeta+1.5*uapha)*Tswitch/vdc_link;Z=(-0.8660*ubeta+1.5*uapha)*Tswitch/vdc_link;switch (N) case 1: Tx= Y;

9、Ty=-Z;break; case 2: Tx=-X;Ty= Y;break; case 3: Tx= Z;Ty= X;break; case 4: Tx=-Z;Ty=-X;break; case 5: Tx= X;Ty=-Y;break; default: Tx=-Y;Ty= Z;if (Tx+Ty)>Tswitch)Tx=Tx*Tswitch/(Tx+Ty);Ty=Ty*Tswitch/(Tx+Ty);T0=(Tswitch-(Tx+Ty)/4;Tl=(Tswitch+Tx-Ty)/4;/*Tl=T0/4+Tx/2*/Tm=(Tswitch-Tx+Ty)/4;/*Tm=T0/4+Ty

10、/2*/Th=(Tswitch+Tx+Ty)/4;/*Th=T0/4+Ty/2+Ty/2*/switch (N) case 1 :*ptr=Tm; *(ptr+1)=T0; *(ptr+2)=Th;break; case 2 :*ptr=T0; *(ptr+1)=Th; *(ptr+2)=Tm;break; case 3 :*ptr=T0; *(ptr+1)=Tl; *(ptr+2)=Th;break; case 4 :*ptr=Th; *(ptr+1)=Tm; *(ptr+2)=T0;break; case 5 :*ptr=Th; *(ptr+1)=T0; *(ptr+2)=Tl;break

11、; default :*ptr=Tl; *(ptr+1)=Th; *(ptr+2)=T0;void init_eva()/ EVA Configure T1PWM, T2PWM, PWM1-PWM6 / Initalize the timers / Initalize EVA Timer1 EvaRegs.T1PR = 0x1D4C; / Timer1 period HSPCLK/fz=75E6/5E3=15000,T1PR=15000/2=0X1D4C /EvaRegs.T1CMPR = 0x3C00; / Timer1 compare EvaRegs.T1CNT = 0x0000; / T

12、imer1 counter / TMODE = continuous up/down / Timer enable / Timer compare enable /EVA_INPUT_CLK=HSPCLK/1=75MHZ EvaRegs.T1CON.all = 0x0842; / Initalize EVA Timer2 /EvaRegs.T2PR = 0x0FFF; / Timer2 period/ EvaRegs.T2CMPR = 0x03C0; / Timer2 compare/EvaRegs.T2CNT = 0x0000; / Timer2 counter/ TMODE = conti

13、nuous up/down/ Timer enable/ Timer compare enable/EvaRegs.T2CON.all = 0x1042; / Setup T1PWM and T2PWM/ Drive T1/T2 PWM by compare logicEvaRegs.GPTCONA.bit.TCMPOE = 1;/ Polarity of GP Timer 1 Compare = Active lowEvaRegs.GPTCONA.bit.T1PIN = 1;/ Polarity of GP Timer 2 Compare = Active highEvaRegs.GPTCO

14、NA.bit.T2PIN = 2;/ Enable compare for PWM1-PWM6EvaRegs.CMPR1 = 0x0C00;EvaRegs.CMPR2 = 0x3C00;EvaRegs.CMPR3 = 0xFC00; / Compare action control. Action that takes place/ on a cmpare event/ output pin 1 CMPR1 - active high/ output pin 2 CMPR1 - active low/ output pin 3 CMPR2 - active high/ output pin 4 CMPR2 - active low/ output pin 5 CMPR3 - active high/ outp