dsps_dotprod_s16_ansi.c File Reference

#include "dsps_dotprod.h"

Include dependency graph for dsps_dotprod_s16_ansi.c:

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Functions
esp_err_t	dsps_dotprod_s16_ansi (const int16_t *src1, const int16_t *src2, int16_t *dest, int len, int8_t shift)
	dot product of two 16 bit vectors Dot product calculation for two signed 16 bit arrays: *dest += (src1[i] * src2[i]) >> (15-shift); i= [0..N) The extension (_ansi) use ANSI C and could be compiled and run on any platform. The extension (_ae32) is optimized for ESP32 chip.

Function Documentation

dsps_dotprod_s16_ansi()

esp_err_t dsps_dotprod_s16_ansi	(	const int16_t *	src1,
		const int16_t *	src2,
		int16_t *	dest,
		int	len,
		int8_t	shift )

dot product of two 16 bit vectors Dot product calculation for two signed 16 bit arrays: *dest += (src1[i] * src2[i]) >> (15-shift); i= [0..N) The extension (_ansi) use ANSI C and could be compiled and run on any platform. The extension (_ae32) is optimized for ESP32 chip.

Parameters

[in]	src1	source array 1
[in]	src2	source array 2
	dest	destination pointer
[in]	len	length of input arrays
[in]	shift	shift of the result.

Returns

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

Definition at line 17 of file dsps_dotprod_s16_ansi.c.

{
    // To make correct round operation we have to shift round value
    long long acc = 0x7fff >> shift;
 
    for (int i = 0 ; i < len ; i++) {
        acc += (int32_t)src1[i] * (int32_t)src2[i];
    }
 
    int final_shift = shift - 15;
    if (final_shift > 0) {
        *dest = (acc << final_shift);
    } else {
        *dest = (acc >> (-final_shift));
    }
    return ESP_OK;
}

References ESP_OK.