TI程序里对速度的计算程序求解释
void speed_prd_calc(SPEED_MEAS_CAP *v){
if (v->InputSelect == 0)
{
v->OldTimeStamp = v->NewTimeStamp;
v->NewTimeStamp = v->TimeStamp;
v->EventPeriod = v->NewTimeStamp - v->OldTimeStamp; ///求出两脉冲之间的时间差
if (v->EventPeriod < 0)
v->EventPeriod += 32767; // 0x7FFF = 32767
}
v->Speed = _IQdiv(v->SpeedScaler,v->EventPeriod); //？？？？？？？？？？？？？？
v->SpeedRpm = _IQmpy(v->BaseRpm,v->Speed); ////???????????????????????
}
程序中
speed1.SpeedScaler = 60*(SYSTEM_FREQUENCY*1000000/1000)*1/(128*speed1.BaseRpm);
求大侠们帮忙看看打问号的两句是啥子意思来着，v->BaseRpm是额定频率（转/分）
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