fir32.h

freescale MAC DSP的算法库（FFT

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**********************************************
* FILE NAME: fir32.h
*
* PURPOSE: FIR32 module header file, containing general definitions and 
*	       function prototypes for allocating/deallocating data structures
*	       for filter and computing a Finite Impulse Responce filter.
*
* AUTHOR:  Andrey Butok
*********************************************/
#ifndef _FIR32_H_
#define _FIR32_H_

#include "fir.h"
/******************************************
*32-bit Fractional FIR Filter
******************************************/
 typedef struct tFir32Struct
	{
	Frac32* pFirCoef;                   // Coefficients for FIR -> {a0,a1,a2...}
	unsigned int    iFirCoefCount;      // Number of Coefficients
	Frac32* pFirHistory;                // Buffer for Save hisory between function calls-> {X1,X2,X3...}
	unsigned int    iFirHistoryCount;   // Number of values in History Buffer
	};

 //Computes a Finite Impulse Response for a array of 32-bit fractional data values.
 void FIR32_EMAC(struct tFir32Struct *pFIR, Frac32* pX, Frac32* pY, unsigned int n);
 void FIR32_MAC(struct tFir32Struct *pFIR, Frac32* pX, Frac32* pY, unsigned int n);

 //Performs the initalization for the FIR32 filter function.
struct tFir32Struct* FIR32Create( Frac32* pCoef, uint16 u16Num);

 //Deallocates the data structure(s) initially allocated by FIR32Create.
 void FIR32Destroy(struct tFir32Struct* pFirStruct);

#ifdef __EMAC
	#define FIR32(w,x,y,z)	FIR32_EMAC(w,x,y,z)
#else
	#define FIR32(w,x,y,z)	FIR32_MAC(w,x,y,z)
#endif

#endif //_FIR32_H_