EPWM Global Load Function (TMS320F28377D)

Kengo Kanazawa

Prodigy 80 points

Other Parts Discussed in Thread: TMS320F28377S, CONTROLSUITE

I am using TMS320F28377S, and configuring Global PWM Load Function.

I have some questions about this function.

I use GLDCNT for updating registers(CMPA,CMPB,etc...) timing adjustment.

And I checked GLDCNT value at ePWM1 by like

(GCNT1 = EPwm2Regs.GLDCTL.bit.GLDCNT;)

Then,I noticed GLDCNT value is 0 at A point and 1 at B point (Please see the following code)

------------------------------------------------------------------------------

EALLOW;

EPwm2Regs.GLDCTL.all = 0x0183U;

EPwm2Regs.GLDCFG.all = 0x0002U;

EDIS;

EPwm2Regs.TBCTL.all = 0x8003U;
EPwm2Regs.TBPRD = 999;

(A point)

EPwm2Regs.TBCTL.bit.CTRMODE = 0U;

CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 0x1U;

(B point)

---------------------------------------------------

So I interpreted Initial GLDCNT value is 1 because that value changes 0 to 1 when TBCLKSYNC = 1U;

Is this interpretation is true?

When ePWM3 configuring is following

EALLOW;

EPwm3Regs.GLDCTL.all = 0x0181U;/* Load registers when TBCTR = 0U,and GLDPRD = 3U */

EPwm3Regs.GLDCFG.all = 0x0002U;

EDIS;

EPwm3Regs.TBPRD = 999;

EPwm3Regs.TBCTL.bit.CTRMODE = 0U;

GLDCNT value changes like

0→1(when TBCLK = 1U)→2(after 10us)

and TBCTR changes like this

0→0(when TBCLK = 1U,TBCTR starts counting up (C point) )→999(reaches TBPRD value)→0(afetr 10us,GLDCNT value changes 1 to 2)

Does this mean first TBCTR = 0U (C point) is not treated as TBCTR = Event ?

3:When configuring ePWMs like below

#include <math.h>
#include <F2837xS_Cla_typedefs.h>
#include <F2837xS_device.h>

#pragma CODE_SECTION(InitFlash_Bank0, "ramfuncs");
#pragma CODE_SECTION(InitFlash_Bank1, "ramfuncs");

#define  IMULT_12 12
#define  IMULT_20 20
#define  IMULT_40 40
#define  FMULT_0  0
#define  PLLCLK_BY_2 1
#define  INT_OSC2 0
#define  XTAL_OSC 1
#define  INT_OSC1 2
#define  AUXCLKIN 4

#define PLLCLK_BY_126 63

static void InitFlash_Bank0(void);
static void InitFlash_Bank1(void);
static void InitSysPll(Uint16 clock_source, Uint16 imult, Uint16 fmult, Uint16 divsel);
static void SysIntOsc1Sel(void);
static void SysIntOsc2Sel(void);
static void SysXtalOscSel(void);
static void InitPeripheralClocks();
static void InitGpio();
static void InitPieCtrl(void);
static void InitPieVectTable(void);
static void DisableDog(void);
static void ISR_ILLEGAL(void);
static void MemCopy(Uint16* DestAddr, Uint16* SourceAddr, Uint32 size );
extern Uint16 RamfuncsRunStart;
extern Uint16 RamfuncsLoadStart;
extern Uint32 RamfuncsLoadSize;

void InitSystem(void);
Uint16 InitPWM(Uint16 CarrierFrequency, float32 DeadtimePonRaw, float32 DeadtimeNonRaw,
Uint16 InitPinP, Uint16 InitPinN, Uint16 Offset);
Uint16 SetPhase_Duty_PWM(float32 Duty_P, float32 Duty_S);
void F28x_usDelay(Uint32);

Uint16 CNT1 = 0U;
Uint16 CNT2 = 0U;
Uint16 CNT3 = 0U;
Uint16 CNT4 = 0U;
Uint16 CNT5 = 0U;
Uint16 CNT6 = 0U;
Uint16 CNT7 = 0U;
Uint16 CNT8 = 0U;
Uint16 CNT9 = 0U;
Uint16 CNT10 = 0U;
Uint16 CNT11 = 0U;
Uint16 CNT12 = 0U;
Uint16 CNT13 = 0U;
Uint16 CNT14 = 0U;
Uint16 CNT15 = 0U;
Uint16 CNT16 = 0U;
Uint16 CNT17 = 0U;
Uint16 CNT18 = 0U;
Uint16 CNT19 = 0U;
Uint16 CNT20 = 0U;
Uint16 CNT21 = 0U;
Uint16 CNT22 = 0U;
Uint16 CNT23 = 0U;
Uint16 CNT24 = 0U;
Uint16 CNT25 = 0U;
Uint16 CNT26 = 0U;
Uint16 CNT27 = 0U;
Uint16 CNT28 = 0U;
Uint16 CNT29 = 0U;
Uint16 CNT30 = 0U;
Uint16 CNT31 = 0U;
Uint16 CNT32 = 0U;
Uint16 CNT33 = 0U;
Uint16 CNT34 = 0U;
Uint16 CNT35 = 0U;
Uint16 CNT36 = 0U;
Uint16 GCNT0 = 0U;
Uint16 GCNT1 = 0U;
Uint16 GCNT2 = 0U;
Uint16 GCNT3 = 0U;
Uint16 GCNT4 = 0U;
Uint16 GCNT5 = 0U;
Uint16 GCNT6 = 0U;
Uint16 GCNT7 = 0U;
Uint16 GCNT8 = 0U;
Uint16 GCNT9 = 0U;
Uint16 GCNT10 = 0U;
Uint16 GCNT11 = 0U;
Uint16 GCNT12 = 0U;
Uint16 GCNT13 = 0U;
Uint16 GCNT14 = 0U;
Uint16 GCNT15 = 0U;
Uint16 GCNT16 = 0U;
Uint16 GCNT17 = 0U;
Uint16 GCNT18 = 0U;
Uint16 GCNT19 = 0U;
Uint16 GCNT20 = 0U;
Uint16 GCNT21 = 0U;
Uint16 GCNT22 = 0U;
Uint16 GCNT23 = 0U;
Uint16 GCNT24 = 0U;
Uint16 GCNT25 = 0U;
Uint16 GCNT26 = 0U;
Uint16 GCNT27 = 0U;
Uint16 GCNT28 = 0U;
Uint16 GCNT41 = 0U;
Uint16 GCNT42 = 0U;
Uint16 GCNT43 = 0U;
Uint16 GCNT44 = 0U;
Uint16 GCNT45 = 0U;
Uint16 GCNT46 = 0U;
Uint16 GCNT47 = 0U;
Uint16 GCNT48 = 0U;
Uint16 ICNT1 = 0U;
Uint16 ICNT2 = 0U;
Uint16 ICNT3 = 0U;
Uint16 ICNT4 = 0U;
Uint16 ICNT5 = 0U;
Uint16 ICNT6 = 0U;
float32 u = 0.9F;
float32 v = 0.9F;
float32 w = 0.0F;
Uint16 cnt_int = 0U;
Uint16 debugswitch = 4U;

#pragma INTERRUPT(Phase_Duty)

void Phase_Duty(void)
{
PieCtrlRegs.PIEACK.all = 0xFFFFU;
{
  if(cnt_int == 0U)
  {
   SetPhase_Duty_PWM(0.9,0.9);
   cnt_int = 1U;
  }
  else if(cnt_int == 1U)
  {
   SetPhase_Duty_PWM(-0.9,-0.9);
   cnt_int = 0U;
  }
}

EPwm1Regs.ETCLR.all = 0x1U;
}

int main(void)
{
__disable_interrupts();
InitSystem();
InitPWM(100,10,10,1,1,0);
__enable_interrupts();
EALLOW;
F28x_usDelay((Uint32)(5 * 40L) - 2);
GpioCtrlRegs.GPADIR.bit.GPIO10 = 1U;
CNT1 = EPwm1Regs.TBCTR;
GCNT1 = EPwm2Regs.GLDCTL.bit.GLDCNT;
GpioDataRegs.GPASET.bit.GPIO10 = 1UL;
CNT2 = EPwm2Regs.TBCTR;
GCNT2 = EPwm3Regs.GLDCTL.bit.GLDCNT;
CNT3 = EPwm3Regs.TBCTR;
GpioDataRegs.GPACLEAR.bit.GPIO10 = 1UL;
GCNT41 = EPwm4Regs.GLDCTL.bit.GLDCNT;
CNT4 = EPwm4Regs.TBCTR;
GCNT3 = EPwm5Regs.GLDCTL.bit.GLDCNT;
CNT5 = EPwm5Regs.TBCTR;
GCNT4 = EPwm6Regs.GLDCTL.bit.GLDCNT;
CNT6 = EPwm6Regs.TBCTR;
ICNT1 = EPwm3Regs.ETPS.bit.INTCNT;
EDIS;