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Embedded Software and Motor Control Libraries for PXR40xx

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Function GDFLIB_FilterFIR_F16<br />

4.4.6 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_F16 Param;<br />

GDFLIB_FILTERFIR_STATE_T_F16 State;<br />

tFrac16 f16InBuf[FIR_NUMTAPS_MAX];<br />

tFrac16 f16CoefBuf[FIR_NUMTAPS_MAX];<br />

#define OUT_LEN 16<br />

void main(void)<br />

{<br />

int ii;<br />

tFrac16 f16OutBuf[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 />

f16CoefBuf[ii++] = 0xFFB1;<br />

f16CoefBuf[ii++] = 0xFF77;<br />

f16CoefBuf[ii++] = 0x0138;<br />

f16CoefBuf[ii++] = 0x028E;<br />

f16CoefBuf[ii++] = 0xFB24;<br />

f16CoefBuf[ii++] = 0xF718;<br />

f16CoefBuf[ii++] = 0x1195;<br />

f16CoefBuf[ii++] = 0x393E;<br />

f16CoefBuf[ii++] = 0x393E;<br />

f16CoefBuf[ii++] = 0x1195;<br />

f16CoefBuf[ii++] = 0xF718;<br />

f16CoefBuf[ii++] = 0xFB24;<br />

f16CoefBuf[ii++] = 0x028E;<br />

f16CoefBuf[ii++] = 0x0138;<br />

f16CoefBuf[ii++] = 0xFF77;<br />

f16CoefBuf[ii++] = 0xFFB1;<br />

Param.u16Order = 15;<br />

Param.pf16CoefBuf = &f16CoefBuf[0];<br />

// Initialize FIR filter<br />

GDFLIB_FilterFIRInit_F16 (&Param, &State, &f16InBuf[0]);<br />

// Initialize FIR filter<br />

GDFLIB_FilterFIRInit (&Param, &State, &f16InBuf[0], Define F16);<br />

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

// Available only if 16-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 />

160 Freescale Semiconductor, Inc.

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