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DAC输出正弦波，输出频率f=1/T=1/(TACCR0).
通过调节CCR0的值调节正弦波的周期，从而调节频率。但是发现了个问题，就是频率不能线性调节（即以一定步长调节频率）。
有没有什么方法可以解决这一问题？
