Part Number: TMS320F28027
Hi team,
Here're few questions from the customer may need your help:
1) The IQ code in the PWM2 interrupt is as follows:
iqtmp =_IQ(spwmiqvar.spwm_cnt)+_IQ(SIN_B);
spwmiqvar.sinvale =_IQsin(spwmiqvar.sina);
spwmiqvar.sinb =_IQmpy(spwmiqvar.M_FACTOR,spwmiqvar.sinvale);
spwm_value=1000+1000*_IQtoF(spwmiqvar.sinb);
How many cycles does the above code execute?
This device has a crystal configuration of 60 MHz and an instruction cycle of 16.6 ns, is this correct?
2) There are 30 global_Q values in IQmathLib.h, are all 30 values stored in the IQmath table?
3) Under what circumstances would it be performed faster with IQ?
For example, three variables UINT16_t a,b; float C.
In the first case:
A=b*c;
Second case:
A=b*_IQtoF(_IQ(c));
Third case:
A=b* _IQ(c) >> global_Q;
What is the execution speed of each of the three cases?
Could you help check this case? Thanks.
Best Regards,
Cherry
