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Embedded Software and Motor Control Libraries for PXR40xx

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In mathematical terms, the function works according to the equation below:<br />

where:<br />

Equation GFLIB_Sign_Eq1<br />

• y out is the return value<br />

• x in is the input value provided as the f16In parameter<br />

Note<br />

The input <strong>and</strong> the output values are in the 16-bit fixed point<br />

fractional data <strong>for</strong>mat.<br />

4.77.5 Re-entrancy<br />

The function is re-entrant.<br />

4.77.6 Code Example<br />

#include "gflib.h"<br />

tFrac16 f16In;<br />

tFrac16 f16Out;<br />

void main(void)<br />

{<br />

// input value = 0.5<br />

f16In = FRAC16 (0.5);<br />

}<br />

// output should be 0x7FFF ~ FRAC16(1)<br />

f16Out = GFLIB_Sign_F16 (f16In);<br />

// output should be 0x7FFF ~ FRAC16(1)<br />

f16Out = GFLIB_Sign (f16In,Define F16);<br />

// ##############################################################<br />

// Available only if 16-bit fractional implementation selected<br />

// as default<br />

// ##############################################################<br />

// output should be 0x7FFF ~ FRAC16(1)<br />

f16Out = GFLIB_Sign (f16In);<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. 397

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