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Embedded Software and Motor Control Libraries for PXR40xx

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Function MLIB_Mac_F32F16F16<br />

}<br />

// input2 value = 0.15<br />

f16In2 = FRAC16 (0.15);<br />

// input3 value = 0.35<br />

f16In3 = FRAC16 (0.35);<br />

// output should be FRAC32(0.3025) = 0x26B851EB<br />

f32Out = MLIB_Mac_F32F16F16(f32In1, f16In2, f16In3);<br />

// output should be FRAC32(0.3025) = 0x26B851EB<br />

f32Out = MLIB_Mac (f32In1, f32In2, f32In3, F32F16F16);<br />

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

Equation MLIB_Mac_Eq1<br />

This implementation is available if 32-bit fractional implementations are enabled.<br />

However it is not possible to use the default implementation based function call, thus the<br />

implementation post-fix or additional parameter function call shall be used.<br />

Note<br />

Due to effectivity reason this function is implemented as inline<br />

<strong>and</strong> thus is not ANSI-C compliant.<br />

4.143.7 Re-entrancy<br />

The function is re-entrant.<br />

4.143.8 Code Example<br />

#include "mlib.h"<br />

tFrac32 f32In1;<br />

tFrac16 f16In2;<br />

tFrac16 f16In3;<br />

tFrac32 f32Out;<br />

void main(void)<br />

{<br />

// input1 value = 0.25<br />

f32In1 = FRAC32 (0.25);<br />

// input2 value = 0.15<br />

f16In2 = FRAC16 (0.15);<br />

// input3 value = 0.35<br />

f16In3 = FRAC16 (0.35);<br />

// output should be FRAC32(0.3025) = 0x26B851EB<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 />

600 Freescale Semiconductor, Inc.

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