16-bit FIR filter

UM0585

14/25

Doc ID 14988 Rev 2

4.2.1

fir_16by16_stm32

function

Table 8 describes the fir_16by16_stm32 function.

The filter coefficients and their number must be filled into a structure of the COEFS type.

The coefficients structure is defined as follows:

typedef struct {

short *h;

unsigned int nh;

}COEFS;

Example

#define M 32 /*number of coefficients*/

#define N 32 /*number of output samples*/

COEFS fir_coefs;/*coefficients structure*/

int a[N];/*filter output vector*/

fir_coefs.nh = M; /*Number of Coefficients for FIR*/

fir_coefs.h = h; /*Pointer on FIR coefficient vector*/

fir_16by16_stm32(a,x,&fir_coefs,N);/*performs the FIR filtering*/

Table 8.

fir_16by16_stm32

function

Function name

fir_16by16_stm32

Prototype

void fir_16by16_stm32(int *a,short *x,struct

COEFS

*p,unsigned int N)

Behavior description

Block Fir 16-bit filter.

Input parameter

– a: output array

– x: input array

– p: pointer to the coefficient structure of the

– N: number of output samples

Output parameter

None

Return parameter

None