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TMS320F280049: pwm的第一个周期不固定。

Part Number: TMS320F280049
Other Parts Discussed in Thread: C2000WARE

第一个脉冲的周期如何控制呢,我现在发现第一个脉冲的周期大小不一样,有时候会有3个周期,有时候不到1个周期。我现在想固定住第一个脉冲的周期为我设的的周期。有没有什么参考例程我可以看看的?