Mercurial > pub > halpp

comparison f103c8/Drivers/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_power_f32.c @ 2:0c59e7a7782a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Working on GPIO and RCC
author cin
date Mon, 16 Jan 2017 11:04:47 +0300
parents
children
comparison
equal deleted inserted replaced
1:a0b14b11ad9f 2:0c59e7a7782a
1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
3 *
4 * $Date: 19. March 2015
5 * $Revision: V.1.4.5
6 *
7 * Project: CMSIS DSP Library
8 * Title: arm_power_f32.c
9 *
10 * Description: Sum of the squares of the elements of a floating-point vector.
11 *
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
16 * are met:
17 * - Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * - Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in
21 * the documentation and/or other materials provided with the
22 * distribution.
23 * - Neither the name of ARM LIMITED nor the names of its contributors
24 * may be used to endorse or promote products derived from this
25 * software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38 * POSSIBILITY OF SUCH DAMAGE.
39 * ---------------------------------------------------------------------------- */
40
41 #include "arm_math.h"
42
43 /**
44 * @ingroup groupStats
45 */
46
47 /**
48 * @defgroup power Power
49 *
50 * Calculates the sum of the squares of the elements in the input vector.
51 * The underlying algorithm is used:
52 *
53 * <pre>
54 * Result = pSrc[0] * pSrc[0] + pSrc[1] * pSrc[1] + pSrc[2] * pSrc[2] + ... + pSrc[blockSize-1] * pSrc[blockSize-1];
55 * </pre>
56 *
57 * There are separate functions for floating point, Q31, Q15, and Q7 data types.
58 */
59
60 /**
61 * @addtogroup power
62 * @{
63 */
64
65
66 /**
67 * @brief Sum of the squares of the elements of a floating-point vector.
68 * @param[in] *pSrc points to the input vector
69 * @param[in] blockSize length of the input vector
70 * @param[out] *pResult sum of the squares value returned here
71 * @return none.
72 *
73 */
74
75
76 void arm_power_f32(
77 float32_t * pSrc,
78 uint32_t blockSize,
79 float32_t * pResult)
80 {
81 float32_t sum = 0.0f; /* accumulator */
82 float32_t in; /* Temporary variable to store input value */
83 uint32_t blkCnt; /* loop counter */
84
85 #ifndef ARM_MATH_CM0_FAMILY
86
87 /* Run the below code for Cortex-M4 and Cortex-M3 */
88
89 /*loop Unrolling */
90 blkCnt = blockSize >> 2u;
91
92 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
93 ** a second loop below computes the remaining 1 to 3 samples. */
94 while(blkCnt > 0u)
95 {
96 /* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */
97 /* Compute Power and then store the result in a temporary variable, sum. */
98 in = *pSrc++;
99 sum += in * in;
100 in = *pSrc++;
101 sum += in * in;
102 in = *pSrc++;
103 sum += in * in;
104 in = *pSrc++;
105 sum += in * in;
106
107 /* Decrement the loop counter */
108 blkCnt--;
109 }
110
111 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
112 ** No loop unrolling is used. */
113 blkCnt = blockSize % 0x4u;
114
115
116 #else
117
118 /* Run the below code for Cortex-M0 */
119
120 /* Loop over blockSize number of values */
121 blkCnt = blockSize;
122
123 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
124
125
126 while(blkCnt > 0u)
127 {
128 /* C = A[0] * A[0] + A[1] * A[1] + A[2] * A[2] + ... + A[blockSize-1] * A[blockSize-1] */
129 /* compute power and then store the result in a temporary variable, sum. */
130 in = *pSrc++;
131 sum += in * in;
132
133 /* Decrement the loop counter */
134 blkCnt--;
135 }
136
137 /* Store the result to the destination */
138 *pResult = sum;
139 }
140
141 /**
142 * @} end of power group
143 */