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git.gir.st - tmk_keyboard.git/blob - tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/StatisticsFunctions/arm_min_q15.c
1 /* ----------------------------------------------------------------------
2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
4 * $Date: 17. January 2013
7 * Project: CMSIS DSP Library
10 * Description: Minimum value of a Q15 vector.
12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
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
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.
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
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39 * ---------------------------------------------------------------------------- */
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
70 #ifndef ARM_MATH_CM0_FAMILY
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 */
76 /* Initialise the count value. */
78 /* Initialise the index value to zero. */
80 /* Load first input value that act as reference value for comparision */
84 blkCnt
= (blockSize
- 1u) >> 2u;
88 /* Initialize minVal to the next consecutive values one by one */
92 /* compare for the minimum value */
95 /* Update the minimum value and its index */
97 outIndex
= count
+ 1u;
102 /* compare for the minimum value */
105 /* Update the minimum value and its index */
107 outIndex
= count
+ 2u;
112 /* compare for the minimum value */
115 /* Update the minimum value and its index */
117 outIndex
= count
+ 3u;
120 /* compare for the minimum value */
123 /* Update the minimum value and its index */
125 outIndex
= count
+ 4u;
133 /* if (blockSize - 1u ) is not multiple of 4 */
134 blkCnt
= (blockSize
- 1u) % 4u;
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 */
142 blkCnt
= (blockSize
- 1u);
144 /* Initialise the index value to zero. */
146 /* Load first input value that act as reference value for comparision */
149 #endif // #ifndef ARM_MATH_CM0_FAMILY
153 /* Initialize minVal to the next consecutive values one by one */
156 /* compare for the minimum value */
159 /* Update the minimum value and it's index */
161 outIndex
= blockSize
- blkCnt
;
170 /* Store the minimum value and its index into destination pointers */
176 * @} end of Min group