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使用F28335的捕获模块作为PWM发生器,遇到问题

我要实现的功能是输出的PWM脉冲个数严格可控,但每次只能进一次CAP中断,虽然输出的脉冲数量是正确的,但之后我在给CAP3和CAP4两个寄存器赋值,就再也不进中断了,也就没有PWN输出了