本文格式为Word版，下载可任意编辑基于DSP28035的SPWM生成程序 #include #include /#include #define PWM1_INT_ENABLE 1 #define PWM2_INT_ENABLE 1 #define PWM3_INT_ENABLE 1 #define PWM4_INT_ENABLE 1 void InitEPwm1Example(void); void InitEPwm2Example(void); void InitEPwm3Example(void); interrupt void epwm1_timer_isr(void); /interrupt void epwm2_timer_isr(void); /interrupt void epwm3_timer_isr(void); Uint32 EPwm1TimerIntCount; Uint32 EPwm2TimerIntCount; Uint32 EPwm3TimerIntCount; Uint32 EPwm4TimerIntCount; Uint32 TonC1,TonC2; Uint16 k; float32 Tc,N; #define PI 3.1415926 float32 M=0.8; float32 fz=20000; float32 fr=50; void main(void) InitSysCtrl(); InitEPwm1Gpio(); / InitEPwm2Gpio(); / InitEPwm3Gpio(); DINT; InitPieCtrl(); IER = 0x0000; IFR = 0x0000; InitPieVectTable(); EALLOW; / This is needed to write to EALLOW protected registers PieVectTable.EPWM1_INT = / PieVectTable.EPWM2_INT = / PieVectTable.EPWM3_INT = EDIS; EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 0; / Stop all the TB clocks EDIS; InitEPwm1Example(); / InitEPwm2Example(); / InitEPwm3Example(); EALLOW; SysCtrlRegs.PCLKCR0.bit.TBCLKSYNC = 1; EDIS; EPwm1TimerIntCount = 0; EPwm2TimerIntCount = 0; EPwm3TimerIntCount = 0; IER |= M_INT3; PieCtrlRegs.PIEIER3.bit.INTx1 = PWM1_INT_ENABLE; / PieCtrlRegs.PIEIER3.bit.INTx2 = PWM2_INT_ENABLE; / PieCtrlRegs.PIEIER3.bit.INTx3 = PWM3_INT_ENABLE; EINT; / Enable Global interrupt INTM ERTM; for(;) asm( NOP void InitEPwm1Example() EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_CTR_ZERO;/zhuyi EPwm1Regs.TBPRD = 1500; /载波周期=2*1500TBCLK EPwm1Regs.TBPHS.half.TBPHS = 0x0000; / Phase is 0 EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; EPwm1Regs.TBCTR = 0x0000; EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; / Count up down EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; / Disable phase loading EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; / Clock ratio to SYSCLKOUT EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; / Load registers every ZERO_PRD EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO_PRD; EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO_PRD; EPwm1Regs.CMPA.half.CMPA =1000; EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; / Clear PWM1A on CAU EPwm1Regs.AQCTLA.bit.CAD = AQ_SET; EPwm1Regs.AQCTLB.bit.CAU = AQ_SET; / SET PWM1B on CAU EPwm1Regs.AQCTLB.bit.CAD = AQ_CLEAR; /set dead band EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_PRDZERO; /? Select INT on Zero Prd event EPwm1Regs.ETSEL.bit.INTEN = PWM1_INT_ENABLE; / Enable INT EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; interrupt void epwm1_timer_isr(void) EPwm1TimerIntCount+; if( EPwm1Regs.TBCTR=1500) k=0; N=fz/fr; Tc=1/fz; TonC1=Tc/4*(1+M*sin(k*PI/N); k+=2; if(k(2*N-2) k=0; EPwm1Regs.CMPA.half.CMPA = TonC1; / EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; / Clear PWM1A on CAU / EPwm1Regs.AQCTLA.bit.CAD = AQ_SET; / EPwm1Regs.AQCTLB.bit.CAU = AQ_SET; / SET PWM1B on CAU / EPwm1Regs.AQCTLB.bit.CAD = AQ_CLEAR; else k=1; N=fz/fr; Tc=1/fz; TonC2=Tc/4*(1+M*sin(k*PI/N); k+=2; if(k(2*N-1) k=1; EPwm1Regs.CMPA.half.CMPA = TonC2; / EPwm1Regs.AQCTLA.bit.CAU = AQ_CLEAR; / Clear PWM1A on CAU / EPwm1Regs.AQCTLA.bit.CAD = AQ_SET; / EPwm1Regs.AQCTLB.bit.CAU = AQ_SET; / SET PWM1B on CAU / EPwm1Regs.AQCTLB.bit.CAD = AQ_CLEAR; / Clear INT flag for this timer EPwm1Regs.ETCLR.bit.INT = 1; / Acknowledge this interrupt to receive more interrupts from group 3 PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; #include Include File #include DSP280x Examples Include File void InitePWM(void) EALLOW; EPwm1Regs.TBPRD = 600; / Period = 601 TBCLK counts EPwm1Regs.CMPA = 350; / Compare A = 350 TBCLK counts EPwm1Regs.CMPB = 200; / Compare B = 200 TBCLK counts EPwm1Regs.TBPHS = 0; / Set Phase register to zero EPwm1Regs.TBCTR = 0; / clear TB counter EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; / Phase loading disabled EPwm1Regs.TBCTL.bit.PRDLD = TB_SHADOW; EPwm1Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE; EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; / TBCLK = SYSCLK EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW; EPwm1Regs.CMPCTL.bit.LOADAMODE =