dsps_firmr_init_f32.c File Reference

#include "dsps_fir.h"
#include "dsp_common.h"
#include <malloc.h>
#include "dsp_tests.h"

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Functions
esp_err_t	dsps_firmr_init_f32 (fir_f32_t *fir, float *coeffs, float *delay, int length, int interp, int decim, int start_pos)
	initialize structure for multi-rate FIR filter Function initialize structure for 32 bit floating point multi-rate FIR filter The implementation use ANSI C and could be compiled and run on any platform

Function Documentation

dsps_firmr_init_f32()

esp_err_t dsps_firmr_init_f32	(	fir_f32_t *	fir,
		float *	coeffs,
		float *	delay,
		int	length,
		int	interp,
		int	decim,
		int	start_pos )

initialize structure for multi-rate FIR filter Function initialize structure for 32 bit floating point multi-rate FIR filter The implementation use ANSI C and could be compiled and run on any platform

Parameters

fir	pointer to fir filter structure, that must be preallocated
coeffs	array with FIR filter coefficients. Must be length N
delay	array for FIR filter delay line. Must be length N
length	FIR filter length. Length of coeffs and delay arrays.
interp	interpolation factor.
decim	decimation factor.
start_pos	initial value of decimation counter. Must be [0..decim)

Returns

• ESP_OK on success
• One of the error codes from DSP library

Definition at line 12 of file dsps_firmr_init_f32.c.

{
    fir->coeffs = coeffs;
    fir->delay = delay;
    fir->N = length;
    fir->pos = 0;
    fir->decim = decim;
    fir->use_delay = 0;
    fir->interp = interp;
    fir->interp_pos = 0;
    fir->start_pos = start_pos;
    fir->delay_size = length / interp;
 
    if (delay == NULL) {
#ifdef CONFIG_IDF_TARGET_ESP32S3
        fir->delay = (float *)memalign(16, (fir->delay_size + 4) * sizeof(float));
#else
        fir->delay = (float *)malloc((fir->delay_size + 4) * sizeof(float));
#endif // CONFIG_IDF_TARGET_ESP32S3
        fir->use_delay = 1;
    } else {
        fir->use_delay = 0;
    }
 
    if (decim == 0) {
        return ESP_ERR_DSP_INVALID_PARAM;
    }
    if (interp == 0) {
        return ESP_ERR_DSP_INVALID_PARAM;
    }
    if (length % interp != 0) {
        return ESP_ERR_DSP_INVALID_LENGTH;
    }
    if (start_pos < 0 || start_pos >= decim) {
        return ESP_ERR_DSP_INVALID_PARAM;
    }
 
#ifdef CONFIG_IDF_TARGET_ESP32S3
    // The delay array should be aligned to 16
    if (((uint32_t)delay) & 0x0f) {
        return ESP_ERR_DSP_ARRAY_NOT_ALIGNED;
    }
#endif // CONFIG_IDF_TARGET_ESP32S3
 
    for (int i = 0 ; i < fir->delay_size; i++) {
        fir->delay[i] = 0;
    }
    return ESP_OK;
}

References coeffs, fir_f32_s::coeffs, fir_f32_s::decim, delay, fir_f32_s::delay, fir_f32_s::delay_size, ESP_ERR_DSP_ARRAY_NOT_ALIGNED, ESP_ERR_DSP_INVALID_LENGTH, ESP_ERR_DSP_INVALID_PARAM, ESP_OK, fir_f32_s::interp, fir_f32_s::interp_pos, memalign, fir_f32_s::N, fir_f32_s::pos, fir_f32_s::start_pos, and fir_f32_s::use_delay.

Referenced by dsps_resampler_mr_init().

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