Other Parts Discussed in Thread: C2000WARE
Tool/software: Code Composer Studio
Hi,
I configured ePWM2 using the example from C:\ti\c2000\C2000Ware_1_00_03_00\device_support\f2837xs\examples\cpu1\epwm_deadband and I have a problem. When I connected ePWM2A to the osciloscope I didn't see waveform. ePWM2A is always high on osciloscope.
#include "F28x_Project.h" #define EPWM1_MAX_DB 0x03FF #define EPWM2_MAX_DB 0x03FF #define EPWM3_MAX_DB 0x03FF #define EPWM1_MIN_DB 0 #define EPWM2_MIN_DB 0 #define EPWM3_MIN_DB 0 #define DB_UP 1 #define DB_DOWN 0 Uint32 EPwm2TimerIntCount; Uint16 EPwm2_DB_Direction; void InitEPwm2Example(void); __interrupt void epwm2_isr(void); void main(void) { InitSysCtrl(); CpuSysRegs.PCLKCR2.bit.EPWM2=1; InitEPwm2Gpio(); DINT; InitPieCtrl(); IER = 0x0000; IFR = 0x0000; InitPieVectTable(); EALLOW; // This is needed to write to EALLOW protected registers PieVectTable.EPWM2_INT = &epwm2_isr; EDIS; EALLOW; CpuSysRegs.PCLKCR0.bit.TBCLKSYNC =0; EDIS; InitEPwm2Example(); EALLOW; CpuSysRegs.PCLKCR0.bit.TBCLKSYNC =1; EDIS; EPwm2TimerIntCount = 0; IER |= M_INT3; PieCtrlRegs.PIEIER3.bit.INTx2 = 1; EINT; // Enable Global interrupt INTM ERTM; // Enable Global realtime interrupt DBGM for(;;) { asm (" NOP"); } } // epwm2_isr - EPWM2 ISR __interrupt void epwm2_isr(void) { if(EPwm2_DB_Direction == DB_UP) { if(EPwm2Regs.DBFED.bit.DBFED < EPWM2_MAX_DB) { EPwm2Regs.DBFED.bit.DBFED++; EPwm2Regs.DBRED.bit.DBRED++; } else { EPwm2_DB_Direction = DB_DOWN; EPwm2Regs.DBFED.bit.DBFED--; EPwm2Regs.DBRED.bit.DBRED--; } } else { if(EPwm2Regs.DBFED.bit.DBFED == EPWM2_MIN_DB) { EPwm2_DB_Direction = DB_UP; EPwm2Regs.DBFED.bit.DBFED++; EPwm2Regs.DBRED.bit.DBRED++; } else { EPwm2Regs.DBFED.bit.DBFED--; EPwm2Regs.DBRED.bit.DBRED--; } } EPwm2TimerIntCount++; EPwm2Regs.ETCLR.bit.INT = 1; PieCtrlRegs.PIEACK.all = PIEACK_GROUP3; } void InitEPwm2Example() { EPwm2Regs.TBPRD = 6000; // Set timer period EPwm2Regs.TBPHS.bit.TBPHS = 0x0000; // Phase is 0 EPwm2Regs.TBCTR = 0x0000; // Clear counter EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count up EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV4; // Clock ratio to SYSCLKOUT EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV4; // Slow just to observe on // the scope EPwm2Regs.CMPA.bit.CMPA = 3000; EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM2A on Zero EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR; EPwm2Regs.AQCTLB.bit.CAU = AQ_CLEAR; // Set PWM2A on Zero EPwm2Regs.AQCTLB.bit.CAD = AQ_SET; EPwm2Regs.DBCTL.bit.OUT_MODE = DB_FULL_ENABLE; EPwm2Regs.DBCTL.bit.POLSEL = DB_ACTV_LOC; EPwm2Regs.DBCTL.bit.IN_MODE = DBA_ALL; EPwm2Regs.DBRED.bit.DBRED = EPWM2_MIN_DB; EPwm2Regs.DBFED.bit.DBFED = EPWM2_MIN_DB; EPwm2_DB_Direction = DB_UP; EPwm2Regs.ETSEL.bit.INTSEL = ET_CTR_ZERO; // Select INT on Zero event EPwm2Regs.ETSEL.bit.INTEN = 1; // Enable INT EPwm2Regs.ETPS.bit.INTPRD = ET_3RD; // Generate INT on 3rd event }
Thank you in advance for your help
Best regards
Szymon