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产生正弦波问题

user5145621
Prodigy 140 points


在一个30K中断频率里面使用IQ15sinPu这个函数产生50Hz正弦波，频率始终差点，只有49.4左右！

if(theta < 32768)theta += 54;

else theta = 0;

A = _IQ15sinPu(theta & 0x7FFF);

B = _IQ15sinPu((theta - 10922)&0x7FFF);

C = _IQ15sinPu((theta + 10922)&0x7FFF;

我想问问有什么办法让频率更接近50Hz？