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x修改pwm CPMA寄存器的值后，为什么占空比没有变化，程序刚开始设置了一个频率和占空比，但是程序运行过程中需要改变占空比，修改寄存器后占空比无变化，是不是没有操作正确？还是别的原因呢
Linux下测的还是裸测的？
