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TMS320F28069F: C28x IQmath library : _IQ(float F)

Geon Kim
Expert 1070 points

Part Number: TMS320F28069F

Hello,

I have a question on the C28x IQmath library.

Specifically it is on the Float to IQ24 data type conversion utility: _IQ(float F).

It is defined in the file of IQmathLib.h that

#define   _IQ24(A)      (long) ((A) * 16777216.0L)

It is apparent that 16777216.0 is equal to 2^24.

I can not understand why the floating-number A is multiplied by 2^24 in order to be converted into the IQ24 data type.

Please explain me the reason clearly.

Thank you for your guidance.

With regards,

G. Kim