dsps_mul_s16_ansi.c File Reference

#include "dsps_mul.h"

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Functions
esp_err_t	dsps_mul_s16_ansi (const int16_t *input1, const int16_t *input2, int16_t *output, int len, int step1, int step2, int step_out, int shift)
	Multiply two arrays.

Function Documentation

dsps_mul_s16_ansi()

esp_err_t dsps_mul_s16_ansi	(	const int16_t *	input1,
		const int16_t *	input2,
		int16_t *	output,
		int	len,
		int	step1,
		int	step2,
		int	step_out,
		int	shift )

Multiply two arrays.

The function multiply one input array to another and store result to other array out[i*step_out] = input1[i*step1] * input2[i*step2]; i=[0..len) The implementation use ANSI C and could be compiled and run on any platform

Parameters

[in]	input1	input array 1
[in]	input2	input array 2
	output	output array
	len	amount of operations for arrays
	step1	step over input array 1 (by default should be 1)
	step2	step over input array 2 (by default should be 1)
	step_out	step over output array (by default should be 1)
	shift	output shift after multiplication (by default should be 15)

Returns

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

Definition at line 17 of file dsps_mul_s16_ansi.c.

{
    if (NULL == input1) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (NULL == input2) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
    if (NULL == output) {
        return ESP_ERR_DSP_PARAM_OUTOFRANGE;
    }
 
    for (int i = 0 ; i < len ; i++) {
        int ttt = (int)input1[i * step1] * (int)input2[i * step2];
        output[i * step_out] = ttt >> shift;
    }
    return ESP_OK;
}

References ESP_ERR_DSP_PARAM_OUTOFRANGE, and ESP_OK.

Referenced by microphone_read_task(), and microphone_read_task().

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