File size: 3,389 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | #include "edge-impulse-sdk/dsp/config.hpp"
#if EIDSP_LOAD_CMSIS_DSP_SOURCES
/* ----------------------------------------------------------------------
* Project: CMSIS DSP Library
* Title: arm_bitreversal2.c
* Description: Bitreversal functions
*
* $Date: 23 April 2021
* $Revision: V1.9.0
*
* Target Processor: Cortex-M and Cortex-A cores
* -------------------------------------------------------------------- */
/*
* Copyright (C) 2019 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/transform_functions.h"
#include "edge-impulse-sdk/CMSIS/DSP/Include/arm_common_tables.h"
/**
@brief In-place 64 bit reversal function.
@param[in,out] pSrc points to in-place buffer of unknown 64-bit data type
@param[in] bitRevLen bit reversal table length
@param[in] pBitRevTab points to bit reversal table
@return none
*/
void arm_bitreversal_64(
uint64_t *pSrc,
const uint16_t bitRevLen,
const uint16_t *pBitRevTab)
{
uint64_t a, b, i, tmp;
for (i = 0; i < bitRevLen; )
{
a = pBitRevTab[i ] >> 2;
b = pBitRevTab[i + 1] >> 2;
//real
tmp = pSrc[a];
pSrc[a] = pSrc[b];
pSrc[b] = tmp;
//complex
tmp = pSrc[a+1];
pSrc[a+1] = pSrc[b+1];
pSrc[b+1] = tmp;
i += 2;
}
}
/**
@brief In-place 32 bit reversal function.
@param[in,out] pSrc points to in-place buffer of unknown 32-bit data type
@param[in] bitRevLen bit reversal table length
@param[in] pBitRevTab points to bit reversal table
@return none
*/
void arm_bitreversal_32(
uint32_t *pSrc,
const uint16_t bitRevLen,
const uint16_t *pBitRevTab)
{
uint32_t a, b, i, tmp;
for (i = 0; i < bitRevLen; )
{
a = pBitRevTab[i ] >> 2;
b = pBitRevTab[i + 1] >> 2;
//real
tmp = pSrc[a];
pSrc[a] = pSrc[b];
pSrc[b] = tmp;
//complex
tmp = pSrc[a+1];
pSrc[a+1] = pSrc[b+1];
pSrc[b+1] = tmp;
i += 2;
}
}
/**
@brief In-place 16 bit reversal function.
@param[in,out] pSrc points to in-place buffer of unknown 16-bit data type
@param[in] bitRevLen bit reversal table length
@param[in] pBitRevTab points to bit reversal table
@return none
*/
void arm_bitreversal_16(
uint16_t *pSrc,
const uint16_t bitRevLen,
const uint16_t *pBitRevTab)
{
uint16_t a, b, i, tmp;
for (i = 0; i < bitRevLen; )
{
a = pBitRevTab[i ] >> 2;
b = pBitRevTab[i + 1] >> 2;
//real
tmp = pSrc[a];
pSrc[a] = pSrc[b];
pSrc[b] = tmp;
//complex
tmp = pSrc[a+1];
pSrc[a+1] = pSrc[b+1];
pSrc[b+1] = tmp;
i += 2;
}
}
#endif // EIDSP_LOAD_CMSIS_DSP_SOURCES
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