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Embedded Software and Motor Control Libraries for PXR40xx

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Function GDFLIB_FilterFIR_F32<br />

4.2.6 Code Example<br />

#include "gdflib.h"<br />

#define FIR_NUMTAPS 16<br />

#define FIR_NUMTAPS_MAX 64<br />

#define FIR_ORDER (FIR_NUMTAPS - 1)<br />

GDFLIB_FILTERFIR_PARAM_T_F32 Param;<br />

GDFLIB_FILTERFIR_STATE_T_F32 State;<br />

tFrac32 f32InBuf[FIR_NUMTAPS_MAX];<br />

tFrac32 f32CoefBuf[FIR_NUMTAPS_MAX];<br />

#define OUT_LEN 16<br />

void main(void)<br />

{<br />

int ii;<br />

tFrac32 f32OutBuf[OUT_LEN];<br />

// Define a simple low-pass filter<br />

// The filter coefficients were calculated by the following<br />

// Matlab function (coefficients are contained in Hd.Numerator):<br />

//<br />

//function Hd = fir_example<br />

//FIR_EXAMPLE Returns a discrete-time filter object.<br />

//N = 15;<br />

//F6dB = 0.5;<br />

//<br />

//h = fdesign.lowpass('n,fc', N, F6dB);<br />

//<br />

//Hd = design(h, 'window');<br />

//return;<br />

ii = 0;<br />

f32CoefBuf[ii++] = 0xFFB10C14;<br />

f32CoefBuf[ii++] = 0xFF779D25;<br />

f32CoefBuf[ii++] = 0x01387DD7;<br />

f32CoefBuf[ii++] = 0x028E6845;<br />

f32CoefBuf[ii++] = 0xFB245142;<br />

f32CoefBuf[ii++] = 0xF7183CC7;<br />

f32CoefBuf[ii++] = 0x11950A3C;<br />

f32CoefBuf[ii++] = 0x393ED867;<br />

f32CoefBuf[ii++] = 0x393ED867;<br />

f32CoefBuf[ii++] = 0x11950A3C;<br />

f32CoefBuf[ii++] = 0xF7183CC7;<br />

f32CoefBuf[ii++] = 0xFB245142;<br />

f32CoefBuf[ii++] = 0x028E6845;<br />

f32CoefBuf[ii++] = 0x01387DD7;<br />

f32CoefBuf[ii++] = 0xFF779D25;<br />

f32CoefBuf[ii++] = 0xFFB10C14;<br />

Param.u32Order = 15;<br />

Param.pf32CoefBuf = &f32CoefBuf[0];<br />

// Initialize FIR filter<br />

GDFLIB_FilterFIRInit_F32 (&Param, &State, &f32InBuf[0]);<br />

// Initialize FIR filter<br />

GDFLIB_FilterFIRInit (&Param, &State, &f32InBuf[0], Define F32);<br />

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

// Available only if 32-bit fractional implementation selected<br />

// as default<br />

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

// Initialize FIR filter<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 />

154 Freescale Semiconductor, Inc.

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