75381150fd
Formatting Pass 1 Lots of fixups to adding stdint and stdbool all over the place Formatting Pass 2 Formatting Pass 3 Formatting Pass 4 Update app_bt_stream.cpp
92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
/* ----------------------------------------------------------------------
|
|
* Project: CMSIS DSP Library
|
|
* Title: arm_bitreversal2.c
|
|
* Description: Bitreversal functions
|
|
*
|
|
* $Date: 18. March 2019
|
|
* $Revision: V1.0.0
|
|
*
|
|
* Target Processor: Cortex-M 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 "arm_common_tables.h"
|
|
#include "arm_math.h"
|
|
|
|
/**
|
|
@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;
|
|
}
|
|
}
|