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Embedded Software and Motor Control Libraries for PXR40xx

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Function MLIB_SubSat_F32<br />

4.178.3 Return<br />

The subtraction of the second argument from the first argument.<br />

4.178.4 Description<br />

Subtraction with overflow control of two fractional 32-bit numbers. The second argument<br />

is subtracted from the first one. The input values as well as output value are considered as<br />

32-bit fractional data type. The output saturation is implemented in this function, thus in<br />

case the subtraction of input parameters is outside the (-1, 1) interval, the output value is<br />

limited to the boundary value.<br />

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

Equation MLIB_SubSat_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 />

4.178.5 Re-entrancy<br />

The function is re-entrant.<br />

4.178.6 Code Example<br />

#include "mlib.h"<br />

tFrac32 f32In1;<br />

tFrac32 f32In2;<br />

tFrac32 f32Out;<br />

void main(void)<br />

{<br />

// first input = 0.5<br />

f32In1 = FRAC32 (0.5);<br />

// second input = 0.25<br />

f32In2 = FRAC32 (0.25);<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 />

670 Freescale Semiconductor, Inc.

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