不太明白指针调用方面的事情，望指教

只看该作者 · 2013-11-28 16:41

struct EPWM_REGS {
union  CMPCTL_REG       CMPCTL;  // Compare control
union  CMPA_HRPWM_GROUP CMPA; // Union of CMPA:CMPAHR
Uint16                   CMPB; // Compare B reg
}

typedef struct
{
volatile struct EPWM_REGS *EPwmRegHandle;
Uint16 EPwm_CMPA_Direction;
Uint16 EPwm_CMPB_Direction;
Uint16 EPwmTimerIntCount;
Uint16 EPwmMaxCMPA;
Uint16 EPwmMinCMPA;
Uint16 EPwmMaxCMPB;
Uint16 EPwmMinCMPB;
}EPWM_INFO;

EPWM_INFO epwm4_info;
void update_compare(EPWM_INFO *epwm_info)
{

MotorControl();
epwm_info->EPwmRegHandle->CMPA.half.CMPA = CmpA;
epwm_info->EPwmRegHandle->CMPB = CmpB;
return;
}

主要是这几句话“struct EPWM_REGS”  “volatile struct EPWM_REGS *EPwmRegHandle;”“epwm_info->EPwmRegHandle->CMPA.half.CMPA = CmpA;”像是在struct EPWM_REGS这里定义了“ union  CMPA_HRPWM_GROUP CMPA; // Union of CMPA:CMPAHR
Uint16                   CMPB; // Compare B reg”就可以用指针调用了？
这个是直流电机的  感觉好难哦!