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Embedded Software and Motor Control Libraries for PXR40xx

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Function MLIB_Mul_F32F16F16<br />

4.150.4 Description<br />

Fractional multiplication of two fractional 16-bit values. The input values are considered<br />

as 16-bit fractional values <strong>and</strong> the output value is considered as 32-bit fractional value.<br />

The output saturation is not implemented in this function, thus in case the multiplication<br />

of input values is outside the (-1, 1) interval, the output value will overflow without any<br />

detection.<br />

The output of the function is defined by the following simple equation:<br />

Equation MLIB_Mul_Eq1<br />

Fractional multiplication of two fractional 16-bit values. The input values are considered<br />

as 16-bit fractional values <strong>and</strong> the output value is considered as 32-bit fractional value.<br />

The output saturation is not implemented in this function, thus in case the multiplication<br />

of input values is outside the (-1, 1) interval, the output value will overflow without any<br />

detection.<br />

Overflow is not detected.<br />

4.150.5 Re-entrancy<br />

The function is re-entrant.<br />

4.150.6 Code Example<br />

#include "mlib.h"<br />

tFrac32 f16In1;<br />

tFrac32 f16In2;<br />

tFrac32 f32Out;<br />

void main(void)<br />

{<br />

// first input = 0.5<br />

f16In1 = FRAC16 (0.5);<br />

// second input = 0.25<br />

f16In2 = FRAC16 (0.25);<br />

Note<br />

// output should be 0x10000000 = FRAC32(0.125)<br />

f32Out = MLIB_Mul_F32F16F16(f16In1, f16In2);<br />

<strong>Embedded</strong> <strong>Software</strong> <strong>and</strong> <strong>Motor</strong> <strong>Control</strong> <strong>Libraries</strong> <strong>for</strong> <strong>PXR40xx</strong>, Rev. 1.0<br />

616 Freescale Semiconductor, Inc.

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