Mercurial > pub > halpp

comparison f103c8/Drivers/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_min_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_min_f32.c
9 *
10 * Description: Minimum 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 Min Minimum
49 *
50 * Computes the minimum value of an array of data.
51 * The function returns both the minimum 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 Min
57 * @{
58 */
59
60
61 /**
62 * @brief Minimum 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 minimum value returned here
66 * @param[out] *pIndex index of minimum value returned here
67 * @return none.
68 *
69 */
70
71 void arm_min_f32(
72 float32_t * pSrc,
73 uint32_t blockSize,
74 float32_t * pResult,
75 uint32_t * pIndex)
76 {
77 #ifndef ARM_MATH_CM0_FAMILY
78
79 /* Run the below code for Cortex-M4 and Cortex-M3 */
80
81 float32_t minVal1, minVal2, out; /* Temporary variables to store the output value. */
82 uint32_t blkCnt, outIndex, count; /* loop counter */
83
84 /* Initialise the count value. */
85 count = 0u;
86 /* Initialise the index value to zero. */
87 outIndex = 0u;
88 /* Load first input value that act as reference value for comparision */
89 out = *pSrc++;
90
91 /* Loop unrolling */
92 blkCnt = (blockSize - 1u) >> 2u;
93
94 while(blkCnt > 0)
95 {
96 /* Initialize minVal to the next consecutive values one by one */
97 minVal1 = *pSrc++;
98 minVal2 = *pSrc++;
99
100 /* compare for the minimum value */
101 if(out > minVal1)
102 {
103 /* Update the minimum value and its index */
104 out = minVal1;
105 outIndex = count + 1u;
106 }
107
108 minVal1 = *pSrc++;
109
110 /* compare for the minimum value */
111 if(out > minVal2)
112 {
113 /* Update the minimum value and its index */
114 out = minVal2;
115 outIndex = count + 2u;
116 }
117
118 minVal2 = *pSrc++;
119
120 /* compare for the minimum value */
121 if(out > minVal1)
122 {
123 /* Update the minimum value and its index */
124 out = minVal1;
125 outIndex = count + 3u;
126 }
127
128 /* compare for the minimum value */
129 if(out > minVal2)
130 {
131 /* Update the minimum value and its index */
132 out = minVal2;
133 outIndex = count + 4u;
134 }
135
136 count += 4u;
137
138 blkCnt--;
139 }
140
141 /* if (blockSize - 1u ) is not multiple of 4 */
142 blkCnt = (blockSize - 1u) % 4u;
143
144 #else
145
146 /* Run the below code for Cortex-M0 */
147 float32_t minVal1, out; /* Temporary variables to store the output value. */
148 uint32_t blkCnt, outIndex; /* loop counter */
149
150 /* Initialise the index value to zero. */
151 outIndex = 0u;
152 /* Load first input value that act as reference value for comparision */
153 out = *pSrc++;
154
155 blkCnt = (blockSize - 1u);
156
157 #endif // #ifndef ARM_MATH_CM0_FAMILY
158
159 while(blkCnt > 0)
160 {
161 /* Initialize minVal to the next consecutive values one by one */
162 minVal1 = *pSrc++;
163
164 /* compare for the minimum value */
165 if(out > minVal1)
166 {
167 /* Update the minimum value and it's index */
168 out = minVal1;
169 outIndex = blockSize - blkCnt;
170 }
171
172 blkCnt--;
173
174 }
175
176 /* Store the minimum value and it's index into destination pointers */
177 *pResult = out;
178 *pIndex = outIndex;
179 }
180
181 /**
182 * @} end of Min group
183 */