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像这样，我每次进中断计算PI，重新赋值PWM1,2,3的比较值，而且隔一段时间还要改SET，CLEAR，这样写可以吗，
像这样，我每次进中断计算PI，重新赋值PWM1,2,3的比较值，而且隔一段时间还要改SET，CLEAR，这样写可以吗，
