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Embedded Software and Motor Control Libraries for PXR40xx

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4.133.3 Return<br />

Converted input value in 16-bit fractional <strong>for</strong>mat.<br />

4.133.4 Description<br />

This inline function returns converted input value. The input value is considered as 32-bit<br />

fractional data type <strong>and</strong> output value is considered as 16-bit fractional data type thus both<br />

values represent the values in unity model. The output saturation is not implemented in<br />

this function, thus in case the input value is outside the (-1, 1) interval, the output value<br />

will overflow without any detection.<br />

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

Equation MLIB_ConvertPU_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 />

4.133.5 Re-entrancy<br />

The function is re-entrant.<br />

4.133.6 Code Example<br />

#include "mlib.h"<br />

tFrac32 f32In;<br />

tFrac16 f16Out;<br />

void main(void)<br />

{<br />

// input value = 0.25 = 0x2000 0000<br />

f32In = FRAC32 (0.25);<br />

}<br />

// output should be FRAC16(0.25) = 0x2000<br />

f16Out = MLIB_ConvertPU_F16F32(f32In);<br />

// output should be FRAC16(0.25) = 0x2000<br />

f16Out = MLIB_ConvertPU (f32In, F16F32);<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 />

Chapter 4 API References<br />

Freescale Semiconductor, Inc. 581

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