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comparison f103c8/Drivers/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_max_f32.c @ 2:0c59e7a7782a

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Working on GPIO and RCC
author cin
date Mon, 16 Jan 2017 11:04:47 +0300
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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_max_f32.c
9 *
10 * Description: Maximum value 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 Max Maximum
49 *
50 * Computes the maximum value of an array of data.
51 * The function returns both the maximum value and its position within the array.
52 * There are separate functions for floating-point, Q31, Q15, and Q7 data types.
53 */
54
55 /**
56 * @addtogroup Max
57 * @{
58 */
59
60
61 /**
62 * @brief Maximum value of a floating-point vector.
63 * @param[in] *pSrc points to the input vector
64 * @param[in] blockSize length of the input vector
65 * @param[out] *pResult maximum value returned here
66 * @param[out] *pIndex index of maximum value returned here
67 * @return none.
68 */
69
70 void arm_max_f32(
71 float32_t * pSrc,
72 uint32_t blockSize,
73 float32_t * pResult,
74 uint32_t * pIndex)
75 {
76 #ifndef ARM_MATH_CM0_FAMILY
77
78 /* Run the below code for Cortex-M4 and Cortex-M3 */
79 float32_t maxVal1, maxVal2, out; /* Temporary variables to store the output value. */
80 uint32_t blkCnt, outIndex, count; /* loop counter */
81
82 /* Initialise the count value. */
83 count = 0u;
84 /* Initialise the index value to zero. */
85 outIndex = 0u;
86 /* Load first input value that act as reference value for comparision */
87 out = *pSrc++;
88
89 /* Loop unrolling */
90 blkCnt = (blockSize - 1u) >> 2u;
91
92 /* Run the below code for Cortex-M4 and Cortex-M3 */
93 while(blkCnt > 0u)
94 {
95 /* Initialize maxVal to the next consecutive values one by one */
96 maxVal1 = *pSrc++;
97
98 maxVal2 = *pSrc++;
99
100 /* compare for the maximum value */
101 if(out < maxVal1)
102 {
103 /* Update the maximum value and its index */
104 out = maxVal1;
105 outIndex = count + 1u;
106 }
107
108 maxVal1 = *pSrc++;
109
110 /* compare for the maximum value */
111 if(out < maxVal2)
112 {
113 /* Update the maximum value and its index */
114 out = maxVal2;
115 outIndex = count + 2u;
116 }
117
118 maxVal2 = *pSrc++;
119
120 /* compare for the maximum value */
121 if(out < maxVal1)
122 {
123 /* Update the maximum value and its index */
124 out = maxVal1;
125 outIndex = count + 3u;
126 }
127
128 /* compare for the maximum value */
129 if(out < maxVal2)
130 {
131 /* Update the maximum value and its index */
132 out = maxVal2;
133 outIndex = count + 4u;
134 }
135
136 count += 4u;
137
138 /* Decrement the loop counter */
139 blkCnt--;
140 }
141
142 /* if (blockSize - 1u) is not multiple of 4 */
143 blkCnt = (blockSize - 1u) % 4u;
144
145 #else
146
147 /* Run the below code for Cortex-M0 */
148 float32_t maxVal1, out; /* Temporary variables to store the output value. */
149 uint32_t blkCnt, outIndex; /* loop counter */
150
151 /* Initialise the index value to zero. */
152 outIndex = 0u;
153 /* Load first input value that act as reference value for comparision */
154 out = *pSrc++;
155
156 blkCnt = (blockSize - 1u);
157
158 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
159
160 while(blkCnt > 0u)
161 {
162 /* Initialize maxVal to the next consecutive values one by one */
163 maxVal1 = *pSrc++;
164
165 /* compare for the maximum value */
166 if(out < maxVal1)
167 {
168 /* Update the maximum value and it's index */
169 out = maxVal1;
170 outIndex = blockSize - blkCnt;
171 }
172
173
174 /* Decrement the loop counter */
175 blkCnt--;
176
177 }
178
179 /* Store the maximum value and it's index into destination pointers */
180 *pResult = out;
181 *pIndex = outIndex;
182 }
183
184 /**
185 * @} end of Max group
186 */