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DSP如何用算法实现 频率可调的 正弦波表?

目前确定28069的CPU频率是90M ,确认PWM周期的情况下,可以计算出EPwm1Regs.TBPRD 这个值。

现在需要频率可调的 正弦波,如何计算 EPwm1Regs.TBPRD  EPwm3Regs.CMPA.half.CMPA 等 。

何用算法实现 频率可调的 PWM 正弦波表?