Analog Devices / Mbed OS EVAL-CN0540-ARDZ

Dependencies:   platform_drivers LTC26X6 AD77681

CMSIS-DSP_Lib/Source/BasicMathFunctions/arm_sub_f32.c@1:9dd7c64b4a64, 2021-12-06 (annotated)

Committer:
jngarlitos
Date:
Mon Dec 06 05:22:28 2021 +0000
Revision:
1:9dd7c64b4a64
EVAL-CN0540-ARDZ mbed example program Initial Commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jngarlitos 1:9dd7c64b4a64 1 /* ----------------------------------------------------------------------
jngarlitos 1:9dd7c64b4a64 2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
jngarlitos 1:9dd7c64b4a64 3 *
jngarlitos 1:9dd7c64b4a64 4 * $Date: 19. March 2015
jngarlitos 1:9dd7c64b4a64 5 * $Revision: V.1.4.5
jngarlitos 1:9dd7c64b4a64 6 *
jngarlitos 1:9dd7c64b4a64 7 * Project: CMSIS DSP Library
jngarlitos 1:9dd7c64b4a64 8 * Title: arm_sub_f32.c
jngarlitos 1:9dd7c64b4a64 9 *
jngarlitos 1:9dd7c64b4a64 10 * Description: Floating-point vector subtraction.
jngarlitos 1:9dd7c64b4a64 11 *
jngarlitos 1:9dd7c64b4a64 12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
jngarlitos 1:9dd7c64b4a64 13 *
jngarlitos 1:9dd7c64b4a64 14 * Redistribution and use in source and binary forms, with or without
jngarlitos 1:9dd7c64b4a64 15 * modification, are permitted provided that the following conditions
jngarlitos 1:9dd7c64b4a64 16 * are met:
jngarlitos 1:9dd7c64b4a64 17 * - Redistributions of source code must retain the above copyright
jngarlitos 1:9dd7c64b4a64 18 * notice, this list of conditions and the following disclaimer.
jngarlitos 1:9dd7c64b4a64 19 * - Redistributions in binary form must reproduce the above copyright
jngarlitos 1:9dd7c64b4a64 20 * notice, this list of conditions and the following disclaimer in
jngarlitos 1:9dd7c64b4a64 21 * the documentation and/or other materials provided with the
jngarlitos 1:9dd7c64b4a64 22 * distribution.
jngarlitos 1:9dd7c64b4a64 23 * - Neither the name of ARM LIMITED nor the names of its contributors
jngarlitos 1:9dd7c64b4a64 24 * may be used to endorse or promote products derived from this
jngarlitos 1:9dd7c64b4a64 25 * software without specific prior written permission.
jngarlitos 1:9dd7c64b4a64 26 *
jngarlitos 1:9dd7c64b4a64 27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
jngarlitos 1:9dd7c64b4a64 28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
jngarlitos 1:9dd7c64b4a64 29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
jngarlitos 1:9dd7c64b4a64 30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
jngarlitos 1:9dd7c64b4a64 31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
jngarlitos 1:9dd7c64b4a64 32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
jngarlitos 1:9dd7c64b4a64 33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
jngarlitos 1:9dd7c64b4a64 34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
jngarlitos 1:9dd7c64b4a64 35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
jngarlitos 1:9dd7c64b4a64 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
jngarlitos 1:9dd7c64b4a64 37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
jngarlitos 1:9dd7c64b4a64 38 * POSSIBILITY OF SUCH DAMAGE.
jngarlitos 1:9dd7c64b4a64 39 * ---------------------------------------------------------------------------- */
jngarlitos 1:9dd7c64b4a64 40
jngarlitos 1:9dd7c64b4a64 41 #include "arm_math.h"
jngarlitos 1:9dd7c64b4a64 42
jngarlitos 1:9dd7c64b4a64 43 /**
jngarlitos 1:9dd7c64b4a64 44 * @ingroup groupMath
jngarlitos 1:9dd7c64b4a64 45 */
jngarlitos 1:9dd7c64b4a64 46
jngarlitos 1:9dd7c64b4a64 47 /**
jngarlitos 1:9dd7c64b4a64 48 * @defgroup BasicSub Vector Subtraction
jngarlitos 1:9dd7c64b4a64 49 *
jngarlitos 1:9dd7c64b4a64 50 * Element-by-element subtraction of two vectors.
jngarlitos 1:9dd7c64b4a64 51 *
jngarlitos 1:9dd7c64b4a64 52 * <pre>
jngarlitos 1:9dd7c64b4a64 53 * pDst[n] = pSrcA[n] - pSrcB[n], 0 <= n < blockSize.
jngarlitos 1:9dd7c64b4a64 54 * </pre>
jngarlitos 1:9dd7c64b4a64 55 *
jngarlitos 1:9dd7c64b4a64 56 * There are separate functions for floating-point, Q7, Q15, and Q31 data types.
jngarlitos 1:9dd7c64b4a64 57 */
jngarlitos 1:9dd7c64b4a64 58
jngarlitos 1:9dd7c64b4a64 59 /**
jngarlitos 1:9dd7c64b4a64 60 * @addtogroup BasicSub
jngarlitos 1:9dd7c64b4a64 61 * @{
jngarlitos 1:9dd7c64b4a64 62 */
jngarlitos 1:9dd7c64b4a64 63
jngarlitos 1:9dd7c64b4a64 64
jngarlitos 1:9dd7c64b4a64 65 /**
jngarlitos 1:9dd7c64b4a64 66 * @brief Floating-point vector subtraction.
jngarlitos 1:9dd7c64b4a64 67 * @param[in] *pSrcA points to the first input vector
jngarlitos 1:9dd7c64b4a64 68 * @param[in] *pSrcB points to the second input vector
jngarlitos 1:9dd7c64b4a64 69 * @param[out] *pDst points to the output vector
jngarlitos 1:9dd7c64b4a64 70 * @param[in] blockSize number of samples in each vector
jngarlitos 1:9dd7c64b4a64 71 * @return none.
jngarlitos 1:9dd7c64b4a64 72 */
jngarlitos 1:9dd7c64b4a64 73
jngarlitos 1:9dd7c64b4a64 74 void arm_sub_f32(
jngarlitos 1:9dd7c64b4a64 75 float32_t * pSrcA,
jngarlitos 1:9dd7c64b4a64 76 float32_t * pSrcB,
jngarlitos 1:9dd7c64b4a64 77 float32_t * pDst,
jngarlitos 1:9dd7c64b4a64 78 uint32_t blockSize)
jngarlitos 1:9dd7c64b4a64 79 {
jngarlitos 1:9dd7c64b4a64 80 uint32_t blkCnt; /* loop counter */
jngarlitos 1:9dd7c64b4a64 81
jngarlitos 1:9dd7c64b4a64 82 #ifndef ARM_MATH_CM0_FAMILY
jngarlitos 1:9dd7c64b4a64 83
jngarlitos 1:9dd7c64b4a64 84 /* Run the below code for Cortex-M4 and Cortex-M3 */
jngarlitos 1:9dd7c64b4a64 85 float32_t inA1, inA2, inA3, inA4; /* temporary variables */
jngarlitos 1:9dd7c64b4a64 86 float32_t inB1, inB2, inB3, inB4; /* temporary variables */
jngarlitos 1:9dd7c64b4a64 87
jngarlitos 1:9dd7c64b4a64 88 /*loop Unrolling */
jngarlitos 1:9dd7c64b4a64 89 blkCnt = blockSize >> 2u;
jngarlitos 1:9dd7c64b4a64 90
jngarlitos 1:9dd7c64b4a64 91 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
jngarlitos 1:9dd7c64b4a64 92 ** a second loop below computes the remaining 1 to 3 samples. */
jngarlitos 1:9dd7c64b4a64 93 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 94 {
jngarlitos 1:9dd7c64b4a64 95 /* C = A - B */
jngarlitos 1:9dd7c64b4a64 96 /* Subtract and then store the results in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 97 /* Read 4 input samples from sourceA and sourceB */
jngarlitos 1:9dd7c64b4a64 98 inA1 = *pSrcA;
jngarlitos 1:9dd7c64b4a64 99 inB1 = *pSrcB;
jngarlitos 1:9dd7c64b4a64 100 inA2 = *(pSrcA + 1);
jngarlitos 1:9dd7c64b4a64 101 inB2 = *(pSrcB + 1);
jngarlitos 1:9dd7c64b4a64 102 inA3 = *(pSrcA + 2);
jngarlitos 1:9dd7c64b4a64 103 inB3 = *(pSrcB + 2);
jngarlitos 1:9dd7c64b4a64 104 inA4 = *(pSrcA + 3);
jngarlitos 1:9dd7c64b4a64 105 inB4 = *(pSrcB + 3);
jngarlitos 1:9dd7c64b4a64 106
jngarlitos 1:9dd7c64b4a64 107 /* dst = srcA - srcB */
jngarlitos 1:9dd7c64b4a64 108 /* subtract and store the result */
jngarlitos 1:9dd7c64b4a64 109 *pDst = inA1 - inB1;
jngarlitos 1:9dd7c64b4a64 110 *(pDst + 1) = inA2 - inB2;
jngarlitos 1:9dd7c64b4a64 111 *(pDst + 2) = inA3 - inB3;
jngarlitos 1:9dd7c64b4a64 112 *(pDst + 3) = inA4 - inB4;
jngarlitos 1:9dd7c64b4a64 113
jngarlitos 1:9dd7c64b4a64 114
jngarlitos 1:9dd7c64b4a64 115 /* Update pointers to process next sampels */
jngarlitos 1:9dd7c64b4a64 116 pSrcA += 4u;
jngarlitos 1:9dd7c64b4a64 117 pSrcB += 4u;
jngarlitos 1:9dd7c64b4a64 118 pDst += 4u;
jngarlitos 1:9dd7c64b4a64 119
jngarlitos 1:9dd7c64b4a64 120 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 121 blkCnt--;
jngarlitos 1:9dd7c64b4a64 122 }
jngarlitos 1:9dd7c64b4a64 123
jngarlitos 1:9dd7c64b4a64 124 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
jngarlitos 1:9dd7c64b4a64 125 ** No loop unrolling is used. */
jngarlitos 1:9dd7c64b4a64 126 blkCnt = blockSize % 0x4u;
jngarlitos 1:9dd7c64b4a64 127
jngarlitos 1:9dd7c64b4a64 128 #else
jngarlitos 1:9dd7c64b4a64 129
jngarlitos 1:9dd7c64b4a64 130 /* Run the below code for Cortex-M0 */
jngarlitos 1:9dd7c64b4a64 131
jngarlitos 1:9dd7c64b4a64 132 /* Initialize blkCnt with number of samples */
jngarlitos 1:9dd7c64b4a64 133 blkCnt = blockSize;
jngarlitos 1:9dd7c64b4a64 134
jngarlitos 1:9dd7c64b4a64 135 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
jngarlitos 1:9dd7c64b4a64 136
jngarlitos 1:9dd7c64b4a64 137 while(blkCnt > 0u)
jngarlitos 1:9dd7c64b4a64 138 {
jngarlitos 1:9dd7c64b4a64 139 /* C = A - B */
jngarlitos 1:9dd7c64b4a64 140 /* Subtract and then store the results in the destination buffer. */
jngarlitos 1:9dd7c64b4a64 141 *pDst++ = (*pSrcA++) - (*pSrcB++);
jngarlitos 1:9dd7c64b4a64 142
jngarlitos 1:9dd7c64b4a64 143 /* Decrement the loop counter */
jngarlitos 1:9dd7c64b4a64 144 blkCnt--;
jngarlitos 1:9dd7c64b4a64 145 }
jngarlitos 1:9dd7c64b4a64 146 }
jngarlitos 1:9dd7c64b4a64 147
jngarlitos 1:9dd7c64b4a64 148 /**
jngarlitos 1:9dd7c64b4a64 149 * @} end of BasicSub group
jngarlitos 1:9dd7c64b4a64 150 */