Eli Hughes / CMSIS_DSP_401

V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.

Dependents:   MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more

BasicMathFunctions/arm_negate_q15.c@0:3d9c67d97d6f, 2014-07-28 (annotated)

Committer:
emh203
Date:
Mon Jul 28 15:03:15 2014 +0000
Revision:
0:3d9c67d97d6f
1st working commit.   Had to remove arm_bitreversal2.s     arm_cfft_f32.c and arm_rfft_fast_f32.c.    The .s will not assemble.      For now I removed these functions so we could at least have a library for the other functions.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
emh203 0:3d9c67d97d6f 1 /* ----------------------------------------------------------------------
emh203 0:3d9c67d97d6f 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
emh203 0:3d9c67d97d6f 3 *
emh203 0:3d9c67d97d6f 4 * $Date: 12. March 2014
emh203 0:3d9c67d97d6f 5 * $Revision: V1.4.3
emh203 0:3d9c67d97d6f 6 *
emh203 0:3d9c67d97d6f 7 * Project: CMSIS DSP Library
emh203 0:3d9c67d97d6f 8 * Title: arm_negate_q15.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Negates Q15 vectors.
emh203 0:3d9c67d97d6f 11 *
emh203 0:3d9c67d97d6f 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
emh203 0:3d9c67d97d6f 13 *
emh203 0:3d9c67d97d6f 14 * Redistribution and use in source and binary forms, with or without
emh203 0:3d9c67d97d6f 15 * modification, are permitted provided that the following conditions
emh203 0:3d9c67d97d6f 16 * are met:
emh203 0:3d9c67d97d6f 17 * - Redistributions of source code must retain the above copyright
emh203 0:3d9c67d97d6f 18 * notice, this list of conditions and the following disclaimer.
emh203 0:3d9c67d97d6f 19 * - Redistributions in binary form must reproduce the above copyright
emh203 0:3d9c67d97d6f 20 * notice, this list of conditions and the following disclaimer in
emh203 0:3d9c67d97d6f 21 * the documentation and/or other materials provided with the
emh203 0:3d9c67d97d6f 22 * distribution.
emh203 0:3d9c67d97d6f 23 * - Neither the name of ARM LIMITED nor the names of its contributors
emh203 0:3d9c67d97d6f 24 * may be used to endorse or promote products derived from this
emh203 0:3d9c67d97d6f 25 * software without specific prior written permission.
emh203 0:3d9c67d97d6f 26 *
emh203 0:3d9c67d97d6f 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
emh203 0:3d9c67d97d6f 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
emh203 0:3d9c67d97d6f 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
emh203 0:3d9c67d97d6f 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
emh203 0:3d9c67d97d6f 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
emh203 0:3d9c67d97d6f 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
emh203 0:3d9c67d97d6f 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
emh203 0:3d9c67d97d6f 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
emh203 0:3d9c67d97d6f 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
emh203 0:3d9c67d97d6f 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
emh203 0:3d9c67d97d6f 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
emh203 0:3d9c67d97d6f 38 * POSSIBILITY OF SUCH DAMAGE.
emh203 0:3d9c67d97d6f 39 * -------------------------------------------------------------------- */
emh203 0:3d9c67d97d6f 40 #include "arm_math.h"
emh203 0:3d9c67d97d6f 41
emh203 0:3d9c67d97d6f 42 /**
emh203 0:3d9c67d97d6f 43 * @ingroup groupMath
emh203 0:3d9c67d97d6f 44 */
emh203 0:3d9c67d97d6f 45
emh203 0:3d9c67d97d6f 46 /**
emh203 0:3d9c67d97d6f 47 * @addtogroup negate
emh203 0:3d9c67d97d6f 48 * @{
emh203 0:3d9c67d97d6f 49 */
emh203 0:3d9c67d97d6f 50
emh203 0:3d9c67d97d6f 51 /**
emh203 0:3d9c67d97d6f 52 * @brief Negates the elements of a Q15 vector.
emh203 0:3d9c67d97d6f 53 * @param[in] *pSrc points to the input vector
emh203 0:3d9c67d97d6f 54 * @param[out] *pDst points to the output vector
emh203 0:3d9c67d97d6f 55 * @param[in] blockSize number of samples in the vector
emh203 0:3d9c67d97d6f 56 * @return none.
emh203 0:3d9c67d97d6f 57 *
emh203 0:3d9c67d97d6f 58 * \par Conditions for optimum performance
emh203 0:3d9c67d97d6f 59 * Input and output buffers should be aligned by 32-bit
emh203 0:3d9c67d97d6f 60 *
emh203 0:3d9c67d97d6f 61 *
emh203 0:3d9c67d97d6f 62 * <b>Scaling and Overflow Behavior:</b>
emh203 0:3d9c67d97d6f 63 * \par
emh203 0:3d9c67d97d6f 64 * The function uses saturating arithmetic.
emh203 0:3d9c67d97d6f 65 * The Q15 value -1 (0x8000) will be saturated to the maximum allowable positive value 0x7FFF.
emh203 0:3d9c67d97d6f 66 */
emh203 0:3d9c67d97d6f 67
emh203 0:3d9c67d97d6f 68 void arm_negate_q15(
emh203 0:3d9c67d97d6f 69 q15_t * pSrc,
emh203 0:3d9c67d97d6f 70 q15_t * pDst,
emh203 0:3d9c67d97d6f 71 uint32_t blockSize)
emh203 0:3d9c67d97d6f 72 {
emh203 0:3d9c67d97d6f 73 uint32_t blkCnt; /* loop counter */
emh203 0:3d9c67d97d6f 74 q15_t in;
emh203 0:3d9c67d97d6f 75
emh203 0:3d9c67d97d6f 76 #ifndef ARM_MATH_CM0_FAMILY
emh203 0:3d9c67d97d6f 77
emh203 0:3d9c67d97d6f 78 /* Run the below code for Cortex-M4 and Cortex-M3 */
emh203 0:3d9c67d97d6f 79
emh203 0:3d9c67d97d6f 80 q31_t in1, in2; /* Temporary variables */
emh203 0:3d9c67d97d6f 81
emh203 0:3d9c67d97d6f 82
emh203 0:3d9c67d97d6f 83 /*loop Unrolling */
emh203 0:3d9c67d97d6f 84 blkCnt = blockSize >> 2u;
emh203 0:3d9c67d97d6f 85
emh203 0:3d9c67d97d6f 86 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
emh203 0:3d9c67d97d6f 87 ** a second loop below computes the remaining 1 to 3 samples. */
emh203 0:3d9c67d97d6f 88 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 89 {
emh203 0:3d9c67d97d6f 90 /* C = -A */
emh203 0:3d9c67d97d6f 91 /* Read two inputs at a time */
emh203 0:3d9c67d97d6f 92 in1 = _SIMD32_OFFSET(pSrc);
emh203 0:3d9c67d97d6f 93 in2 = _SIMD32_OFFSET(pSrc + 2);
emh203 0:3d9c67d97d6f 94
emh203 0:3d9c67d97d6f 95 /* negate two samples at a time */
emh203 0:3d9c67d97d6f 96 in1 = __QSUB16(0, in1);
emh203 0:3d9c67d97d6f 97
emh203 0:3d9c67d97d6f 98 /* negate two samples at a time */
emh203 0:3d9c67d97d6f 99 in2 = __QSUB16(0, in2);
emh203 0:3d9c67d97d6f 100
emh203 0:3d9c67d97d6f 101 /* store the result to destination 2 samples at a time */
emh203 0:3d9c67d97d6f 102 _SIMD32_OFFSET(pDst) = in1;
emh203 0:3d9c67d97d6f 103 /* store the result to destination 2 samples at a time */
emh203 0:3d9c67d97d6f 104 _SIMD32_OFFSET(pDst + 2) = in2;
emh203 0:3d9c67d97d6f 105
emh203 0:3d9c67d97d6f 106
emh203 0:3d9c67d97d6f 107 /* update pointers to process next samples */
emh203 0:3d9c67d97d6f 108 pSrc += 4u;
emh203 0:3d9c67d97d6f 109 pDst += 4u;
emh203 0:3d9c67d97d6f 110
emh203 0:3d9c67d97d6f 111 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 112 blkCnt--;
emh203 0:3d9c67d97d6f 113 }
emh203 0:3d9c67d97d6f 114
emh203 0:3d9c67d97d6f 115 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
emh203 0:3d9c67d97d6f 116 ** No loop unrolling is used. */
emh203 0:3d9c67d97d6f 117 blkCnt = blockSize % 0x4u;
emh203 0:3d9c67d97d6f 118
emh203 0:3d9c67d97d6f 119 #else
emh203 0:3d9c67d97d6f 120
emh203 0:3d9c67d97d6f 121 /* Run the below code for Cortex-M0 */
emh203 0:3d9c67d97d6f 122
emh203 0:3d9c67d97d6f 123 /* Initialize blkCnt with number of samples */
emh203 0:3d9c67d97d6f 124 blkCnt = blockSize;
emh203 0:3d9c67d97d6f 125
emh203 0:3d9c67d97d6f 126 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
emh203 0:3d9c67d97d6f 127
emh203 0:3d9c67d97d6f 128 while(blkCnt > 0u)
emh203 0:3d9c67d97d6f 129 {
emh203 0:3d9c67d97d6f 130 /* C = -A */
emh203 0:3d9c67d97d6f 131 /* Negate and then store the result in the destination buffer. */
emh203 0:3d9c67d97d6f 132 in = *pSrc++;
emh203 0:3d9c67d97d6f 133 *pDst++ = (in == (q15_t) 0x8000) ? 0x7fff : -in;
emh203 0:3d9c67d97d6f 134
emh203 0:3d9c67d97d6f 135 /* Decrement the loop counter */
emh203 0:3d9c67d97d6f 136 blkCnt--;
emh203 0:3d9c67d97d6f 137 }
emh203 0:3d9c67d97d6f 138 }
emh203 0:3d9c67d97d6f 139
emh203 0:3d9c67d97d6f 140 /**
emh203 0:3d9c67d97d6f 141 * @} end of negate group
emh203 0:3d9c67d97d6f 142 */