File size: 3,200 Bytes
25ade36 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | #include "edge-impulse-sdk/dsp/config.hpp"
#if EIDSP_LOAD_CMSIS_DSP_SOURCES
/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_linear_interp_f16.c
* Description: Floating-point linear interpolation
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the License); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an AS IS BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "edge-impulse-sdk/CMSIS/DSP/Include/dsp/interpolation_functions_f16.h"
#if defined(ARM_FLOAT16_SUPPORTED)
/**
@ingroup groupInterpolation
*/
/**
* @addtogroup LinearInterpolate
* @{
*/
/**
* @brief Process function for the floating-point Linear Interpolation Function.
* @param[in,out] S is an instance of the floating-point Linear Interpolation structure
* @param[in] x input sample to process
* @return y processed output sample.
*
*/
float16_t arm_linear_interp_f16(
arm_linear_interp_instance_f16 * S,
float16_t x)
{
float16_t y;
float16_t x0, x1; /* Nearest input values */
float16_t y0, y1; /* Nearest output values */
float16_t xSpacing = S->xSpacing; /* spacing between input values */
int32_t i; /* Index variable */
float16_t *pYData = S->pYData; /* pointer to output table */
/* Calculation of index */
i = (int32_t) (((_Float16)x - (_Float16)S->x1) / (_Float16)xSpacing);
if (i < 0)
{
/* Iniatilize output for below specified range as least output value of table */
y = pYData[0];
}
else if ((uint32_t)i >= (S->nValues - 1))
{
/* Iniatilize output for above specified range as last output value of table */
y = pYData[S->nValues - 1];
}
else
{
/* Calculation of nearest input values */
x0 = (_Float16)S->x1 + (_Float16)i * (_Float16)xSpacing;
x1 = (_Float16)S->x1 + (_Float16)(i + 1) * (_Float16)xSpacing;
/* Read of nearest output values */
y0 = pYData[i];
y1 = pYData[i + 1];
/* Calculation of output */
y = (_Float16)y0 + ((_Float16)x - (_Float16)x0) *
(((_Float16)y1 - (_Float16)y0) / ((_Float16)x1 - (_Float16)x0));
}
/* returns output value */
return (y);
}
/**
* @} end of LinearInterpolate group
*/
#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
#endif // EIDSP_LOAD_CMSIS_DSP_SOURCES
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