spwm.zip_28027spwm_F28027_SPWM 频率_SPWM调节_spwm

#include "DSP28x_Project.h" // Device Headerfile and Examples Include File #include "IQmathLib.h" void InitEPwm1Example(void); interrupt void epwm1_isr(void); void sin00(void); #define EPWM1_TIMER_TBPRD 3000 // Period register #define PI 3.14159 _iq10 in2,out2,vp,sin0[300]; int m,n=0; int dianshu=200; volatile int fre=50; volatile int anjian=0; void main(void) { InitSysCtrl(); InitEPwm1Gpio(); DINT; InitPieCtrl(); IER = 0x0000; IFR = 0x0000; InitPieVectTable(); EALLOW; PieVectTable.EPWM1_INT = &epwm1_isr; EDIS; EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; EDIS; InitEPwm1Example(); EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; EDIS; IER |= M_INT3; PieCtrlRegs.PIEIER3.bit.INTx1 = 1; EINT; ERTM; sin00(); for(;;) { if(anjian) { dianshu=10000/fre; sin00(); } } } interrupt void epwm1_isr(void) { if(n<dianshu) { EPwm1Regs.CMPA.half.CMPA=(sin0[n]+1024)*1500/1024; n++; } else { n=0; EPwm1Regs.CMPA.half.CMPA=(sin0[n]+1024)*1500/1024; } EPwm1Regs.ETCLR.bit.INT = 1; PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; } void InitEPwm1Example() { EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up EPwm1Regs.TBPRD = EPWM1_TIMER_TBPRD; // Set timer period EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading EPwm1Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0 EPwm1Regs.TBCTR = 0x0000; // Clear counter EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; //不分频 EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; EPwm1Regs.AQCTLA.bit.CAD = AQ_SET; // Set PWM1A on Zero EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; // Clear PWM1A on event A, up count EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event EPwm1Regs.ETSEL.bit.INTEN = 1; // Enable INT EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; // Generate INT on 1rd event } void sin00(void) { for(m=0;m<dianshu;m++) { in2=_IQ10(100*PI*m/50/dianshu); sin0[m]=_IQ10sin(in2); } }