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pwm波生成中TBCTL设置

在TI给的电机控制例程里,

  (*ePWM[ch1]).TBCTL.all = PWM_INIT_STATE;

 

#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 )

 

#define FREE_RUN_FLAG               0x8000

#define PRDLD_IMMEDIATE             0x0008

。。。。。。依次还有很多

这是什么意思呢?为什么这么多控制符呢?程序是个什么逻辑呢?

 给CTL寄存器不是赋一个值就行了吗? 那么多是先赋一个 再赋下一个 还是什么意思呢?