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comparison f103c8/Drivers/CMSIS/DSP_Lib/Source/StatisticsFunctions/arm_min_q15.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_min_q15.c
9 *
10 * Description: Minimum value of a Q15 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 /**
49 * @addtogroup Min
50 * @{
51 */
52
53
54 /**
55 * @brief Minimum value of a Q15 vector.
56 * @param[in] *pSrc points to the input vector
57 * @param[in] blockSize length of the input vector
58 * @param[out] *pResult minimum value returned here
59 * @param[out] *pIndex index of minimum value returned here
60 * @return none.
61 *
62 */
63
64 void arm_min_q15(
65 q15_t * pSrc,
66 uint32_t blockSize,
67 q15_t * pResult,
68 uint32_t * pIndex)
69 {
70 #ifndef ARM_MATH_CM0_FAMILY
71
72 /* Run the below code for Cortex-M4 and Cortex-M3 */
73 q15_t minVal1, minVal2, out; /* Temporary variables to store the output value. */
74 uint32_t blkCnt, outIndex, count; /* loop counter */
75
76 /* Initialise the count value. */
77 count = 0u;
78 /* Initialise the index value to zero. */
79 outIndex = 0u;
80 /* Load first input value that act as reference value for comparision */
81 out = *pSrc++;
82
83 /* Loop unrolling */
84 blkCnt = (blockSize - 1u) >> 2u;
85
86 while(blkCnt > 0)
87 {
88 /* Initialize minVal to the next consecutive values one by one */
89 minVal1 = *pSrc++;
90 minVal2 = *pSrc++;
91
92 /* compare for the minimum value */
93 if(out > minVal1)
94 {
95 /* Update the minimum value and its index */
96 out = minVal1;
97 outIndex = count + 1u;
98 }
99
100 minVal1 = *pSrc++;
101
102 /* compare for the minimum value */
103 if(out > minVal2)
104 {
105 /* Update the minimum value and its index */
106 out = minVal2;
107 outIndex = count + 2u;
108 }
109
110 minVal2 = *pSrc++;
111
112 /* compare for the minimum value */
113 if(out > minVal1)
114 {
115 /* Update the minimum value and its index */
116 out = minVal1;
117 outIndex = count + 3u;
118 }
119
120 /* compare for the minimum value */
121 if(out > minVal2)
122 {
123 /* Update the minimum value and its index */
124 out = minVal2;
125 outIndex = count + 4u;
126 }
127
128 count += 4u;
129
130 blkCnt--;
131 }
132
133 /* if (blockSize - 1u ) is not multiple of 4 */
134 blkCnt = (blockSize - 1u) % 4u;
135
136 #else
137
138 /* Run the below code for Cortex-M0 */
139 q15_t minVal1, out; /* Temporary variables to store the output value. */
140 uint32_t blkCnt, outIndex; /* loop counter */
141
142 blkCnt = (blockSize - 1u);
143
144 /* Initialise the index value to zero. */
145 outIndex = 0u;
146 /* Load first input value that act as reference value for comparision */
147 out = *pSrc++;
148
149 #endif // #ifndef ARM_MATH_CM0_FAMILY
150
151 while(blkCnt > 0)
152 {
153 /* Initialize minVal to the next consecutive values one by one */
154 minVal1 = *pSrc++;
155
156 /* compare for the minimum value */
157 if(out > minVal1)
158 {
159 /* Update the minimum value and it's index */
160 out = minVal1;
161 outIndex = blockSize - blkCnt;
162 }
163
164 blkCnt--;
165
166 }
167
168
169
170 /* Store the minimum value and its index into destination pointers */
171 *pResult = out;
172 *pIndex = outIndex;
173 }
174
175 /**
176 * @} end of Min group
177 */