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28335 禁止pwm输出

当ePWM处于互补模式下,如何设置才能使6个PWM口都处于低电平?

我本想用AQCSFRC寄存器来设置,但是这样做只能使EPWMA和EPWMB一高一低(因为在互补模式下),所以我现在采用将IO口直接设置为普通GPIO,并拉低。

如此一来可以封波,但是想将普通IO口再恢复至EPWM输出功能,则无法实现。

1.请问大家封波有什么好办法?

2.请问普通IO口再恢复至EPWM输出需要什么操作?