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Embedded Software and Motor Control Libraries for PXR40xx

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Function MLIB_VMac_F32F16F16<br />

}<br />

// input3 value = 0.35<br />

f16In3 = FRAC16 (0.35);<br />

// input4 value = 0.45<br />

f16In4 = FRAC16 (0.45);<br />

// output should be FRAC32(0.195) = 0x18F5C28F<br />

f32Out = MLIB_VMac_F32F16F16(f16In1, f16In2, f16In3, f16In4);<br />

// output should be FRAC32(0.195) = 0x18F5C28F<br />

f32Out = MLIB_VMac (f16In1, f16In2, f16In3, f16In4, F32F16F16);<br />

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

Equation MLIB_VMac_Eq1<br />

Note<br />

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

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

4.181.7 Re-entrancy<br />

The function is re-entrant.<br />

4.181.8 Code Example<br />

#include "mlib.h"<br />

tFrac16 f16In1;<br />

tFrac16 f16In2;<br />

tFrac16 f16In3;<br />

tFrac16 f16In4;<br />

tFrac32 f32Out;<br />

void main(void)<br />

{<br />

// input1 value = 0.25<br />

f16In1 = FRAC16 (0.25);<br />

// input2 value = 0.15<br />

f16In2 = FRAC16 (0.15);<br />

// input3 value = 0.35<br />

f16In3 = FRAC16 (0.35);<br />

// input4 value = 0.45<br />

f16In4 = FRAC16 (0.45);<br />

// output should be FRAC32(0.195) = 0x18F5C28F<br />

f32Out = MLIB_VMac_F32F16F16(f16In1, f16In2, f16In3, f16In4);<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 />

678 Freescale Semiconductor, Inc.

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