我就想问下这个官方例程中PWM的占空比是如何计算的，
TBPRD=PeriodMax=1000;CMPA=_IQmpy(v.HalfPerMax,v.MfuncC1)+ v.HalfPerMax;
其中HalfPerMax= 1000，MfuncC1= 0x4000，定义的IQmpy就是两数相乘就是1000×4×16^3+1000,这个远比TBPRD大呀，这个占空比到底应该如何计算？求大神指导
#ifndef __F2833X_PWM_H__
#define __F2833X_PWM_H__
#include "f2833xbmsk.h"
#include "f2833xdrvlib.h"
/*----------------------------------------------------------------------------
Initialization constant for the F2833X Time-Base Control Registers for PWM Generation.
Sets up the timer to run free upon emulation suspend, count up-down mode
prescaler 1.
----------------------------------------------------------------------------*/
#define PWM_INIT_STATE ( FREE_RUN_FLAG + \
PRDLD_IMMEDIATE + \
TIMER_CNT_UPDN + \
HSPCLKDIV_PRESCALE_X_1 + \
CLKDIV_PRESCALE_X_1 + \
PHSDIR_CNT_UP + \
CNTLD_DISABLE )
/*----------------------------------------------------------------------------
Initialization constant for the F2833X Compare Control Register.
----------------------------------------------------------------------------*/
#define CMPCTL_INIT_STATE ( LOADAMODE_ZRO + \
LOADBMODE_ZRO + \
SHDWAMODE_SHADOW + \
SHDWBMODE_SHADOW )
/*----------------------------------------------------------------------------
Initialization constant for the F2833X Action Qualifier Output A Register.
----------------------------------------------------------------------------*/
#define AQCTLA_INIT_STATE ( CAD_SET + CAU_CLEAR )
/*----------------------------------------------------------------------------
Initialization constant for the F2833X Dead-Band Generator registers for PWM Generation.
Sets up the dead band for PWM and sets up dead band values.
----------------------------------------------------------------------------*/
#define DBCTL_INIT_STATE (BP_ENABLE + POLSEL_ACTIVE_HI_CMP)
#define DBCNT_INIT_STATE 200 // 200 counts = 1.33 usec (delay) (for TBCLK = SYSCLK/1)
/*----------------------------------------------------------------------------
Initialization constant for the F2833X PWM Chopper Control register for PWM Generation.
----------------------------------------------------------------------------*/
#define PCCTL_INIT_STATE CHPEN_DISABLE
/*----------------------------------------------------------------------------
Initialization constant for the F2833X Trip Zone Select Register
----------------------------------------------------------------------------*/
#define TZSEL_INIT_STATE DISABLE_TZSEL
/*----------------------------------------------------------------------------
Initialization constant for the F2833X Trip Zone Control Register
----------------------------------------------------------------------------*/
#define TZCTL_INIT_STATE ( TZA_HI_Z + TZB_HI_Z + \
DCAEVT1_HI_Z + DCAEVT2_HI_Z + \
DCBEVT1_HI_Z + DCBEVT2_HI_Z )
/*-----------------------------------------------------------------------------
Define the structure of the PWM Driver Object
-----------------------------------------------------------------------------*/
typedef struct {
Uint16 PeriodMax; // Parameter: PWM Half-Period in CPU clock cycles (Q0)
Uint16 HalfPerMax; // Parameter: Half of PeriodMax (Q0)
Uint16 Deadband; // Parameter: PWM deadband in CPU clock cycles (Q0)
_iq MfuncC1; // Input: EPWM1 A&B Duty cycle ratio (Q24)
_iq MfuncC2; // Input: EPWM2 A&B Duty cycle ratio (Q24)
_iq MfuncC3; // Input: EPWM3 A&B Duty cycle ratio (Q24)
} PWMGEN ;
/*------------------------------------------------------------------------------
Default Initializers for the F2833X PWMGEN Object
------------------------------------------------------------------------------*/
#define F2833X_FC_PWM_GEN { 1000, \
1000, \
200, \
0x4000, \
0x4000, \
0x4000, \
}
#define PWMGEN_DEFAULTS F2833X_FC_PWM_GEN
/*------------------------------------------------------------------------------
PWM Init & PWM Update Macro Definitions
------------------------------------------------------------------------------*/
#define PWM_INIT_MACRO(ch1,ch2,ch3,v) \
/* Setup Sync*/ \
(*ePWM[ch1]).TBCTL.bit.SYNCOSEL = 0; /* Pass through*/ \
(*ePWM[ch2]).TBCTL.bit.SYNCOSEL = 0; /* Pass through*/ \
(*ePWM[ch3]).TBCTL.bit.SYNCOSEL = 0; /* Pass through*/ \
\
/* Allow each timer to be sync'ed*/ \
(*ePWM[ch1]).TBCTL.bit.PHSEN = 1; \
(*ePWM[ch2]).TBCTL.bit.PHSEN = 1; \
(*ePWM[ch3]).TBCTL.bit.PHSEN = 1; \
\
/* Init Timer-Base Period Register for EPWM1-EPWM3*/ \
(*ePWM[ch1]).TBPRD = v.PeriodMax; \
(*ePWM[ch2]).TBPRD = v.PeriodMax; \
(*ePWM[ch3]).TBPRD = v.PeriodMax; \
\
/* Init Timer-Base Phase Register for EPWM1-EPWM3*/ \
(*ePWM[ch1]).TBPHS.half.TBPHS = 0; \
(*ePWM[ch2]).TBPHS.half.TBPHS = 0; \
(*ePWM[ch3]).TBPHS.half.TBPHS = 0; \
\
/* Init Timer-Base Control Register for EPWM1-EPWM3*/ \
(*ePWM[ch1]).TBCTL.all = PWM_INIT_STATE; \
(*ePWM[ch2]).TBCTL.all = PWM_INIT_STATE; \
(*ePWM[ch3]).TBCTL.all = PWM_INIT_STATE; \
\
/* Init Compare Control Register for EPWM1-EPWM3*/ \
(*ePWM[ch1]).CMPCTL.all = CMPCTL_INIT_STATE; \
(*ePWM[ch2]).CMPCTL.all = CMPCTL_INIT_STATE; \
(*ePWM[ch3]).CMPCTL.all = CMPCTL_INIT_STATE; \
\
/* Init Action Qualifier Output A Register for EPWM1-EPWM3*/ \
(*ePWM[ch1]).AQCTLA.all = AQCTLA_INIT_STATE; \
(*ePWM[ch2]).AQCTLA.all = AQCTLA_INIT_STATE; \
(*ePWM[ch3]).AQCTLA.all = AQCTLA_INIT_STATE; \
\
/* Init Dead-Band Generator Control Register for EPWM1-EPWM3*/ \
(*ePWM[ch1]).DBCTL.all = DBCTL_INIT_STATE; \
(*ePWM[ch2]).DBCTL.all = DBCTL_INIT_STATE; \
(*ePWM[ch3]).DBCTL.all = DBCTL_INIT_STATE; \
\
/* Init Dead-Band Generator for EPWM1-EPWM3*/ \
(*ePWM[ch1]).DBFED = v.Deadband; \
(*ePWM[ch1]).DBRED = v.Deadband; \
(*ePWM[ch2]).DBFED = v.Deadband; \
(*ePWM[ch2]).DBRED = v.Deadband; \
(*ePWM[ch3]).DBFED = v.Deadband; \
(*ePWM[ch3]).DBRED = v.Deadband; \
\
/* Init PWM Chopper Control Register for EPWM1-EPWM3*/ \
(*ePWM[ch1]).PCCTL.all = PCCTL_INIT_STATE; \
(*ePWM[ch2]).PCCTL.all = PCCTL_INIT_STATE; \
(*ePWM[ch3]).PCCTL.all = PCCTL_INIT_STATE; \
\
EALLOW; /* Enable EALLOW */ \
\
/* Init Trip Zone Select Register*/ \
(*ePWM[ch1]).TZSEL.all = TZSEL_INIT_STATE; \
(*ePWM[ch2]).TZSEL.all = TZSEL_INIT_STATE; \
(*ePWM[ch3]).TZSEL.all = TZSEL_INIT_STATE; \
\
/* Init Trip Zone Control Register*/ \
(*ePWM[ch1]).TZCTL.all = TZCTL_INIT_STATE; \
(*ePWM[ch2]).TZCTL.all = TZCTL_INIT_STATE; \
(*ePWM[ch3]).TZCTL.all = TZCTL_INIT_STATE; \
\
EDIS; /* Disable EALLOW*/
#define PWM_MACRO(ch1,ch2,ch3,v) \
\
/* Mfuncx range is (-1,1) */ \
/* The code below changes PeriodMax*Mfuncx range .... */ \
/* from (-PeriodMax,PeriodMax) to (0,PeriodMax) where HalfPerMax=PeriodMax/2 */ \
\
(*ePWM[ch1]).CMPA.half.CMPA = _IQmpy(v.HalfPerMax,v.MfuncC1)+ v.HalfPerMax; \
(*ePWM[ch2]).CMPA.half.CMPA = _IQmpy(v.HalfPerMax,v.MfuncC2)+ v.HalfPerMax; \
(*ePWM[ch3]).CMPA.half.CMPA = _IQmpy(v.HalfPerMax,v.MfuncC3)+ v.HalfPerMax; \
#endif // __F2833X_PWM_H__
