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comparison f103c8/Drivers/CMSIS/DSP_Lib/Source/BasicMathFunctions/arm_offset_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_offset_q15.c
9 *
10 * Description: Q15 vector offset.
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 groupMath
45 */
46
47 /**
48 * @addtogroup offset
49 * @{
50 */
51
52 /**
53 * @brief Adds a constant offset to a Q15 vector.
54 * @param[in] *pSrc points to the input vector
55 * @param[in] offset is the offset to be added
56 * @param[out] *pDst points to the output vector
57 * @param[in] blockSize number of samples in the vector
58 * @return none.
59 *
60 * <b>Scaling and Overflow Behavior:</b>
61 * \par
62 * The function uses saturating arithmetic.
63 * Results outside of the allowable Q15 range [0x8000 0x7FFF] are saturated.
64 */
65
66 void arm_offset_q15(
67 q15_t * pSrc,
68 q15_t offset,
69 q15_t * pDst,
70 uint32_t blockSize)
71 {
72 uint32_t blkCnt; /* loop counter */
73
74 #ifndef ARM_MATH_CM0_FAMILY
75
76 /* Run the below code for Cortex-M4 and Cortex-M3 */
77 q31_t offset_packed; /* Offset packed to 32 bit */
78
79
80 /*loop Unrolling */
81 blkCnt = blockSize >> 2u;
82
83 /* Offset is packed to 32 bit in order to use SIMD32 for addition */
84 offset_packed = __PKHBT(offset, offset, 16);
85
86 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
87 ** a second loop below computes the remaining 1 to 3 samples. */
88 while(blkCnt > 0u)
89 {
90 /* C = A + offset */
91 /* Add offset and then store the results in the destination buffer, 2 samples at a time. */
92 *__SIMD32(pDst)++ = __QADD16(*__SIMD32(pSrc)++, offset_packed);
93 *__SIMD32(pDst)++ = __QADD16(*__SIMD32(pSrc)++, offset_packed);
94
95 /* Decrement the loop counter */
96 blkCnt--;
97 }
98
99 /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
100 ** No loop unrolling is used. */
101 blkCnt = blockSize % 0x4u;
102
103 while(blkCnt > 0u)
104 {
105 /* C = A + offset */
106 /* Add offset and then store the results in the destination buffer. */
107 *pDst++ = (q15_t) __QADD16(*pSrc++, offset);
108
109 /* Decrement the loop counter */
110 blkCnt--;
111 }
112
113 #else
114
115 /* Run the below code for Cortex-M0 */
116
117 /* Initialize blkCnt with number of samples */
118 blkCnt = blockSize;
119
120 while(blkCnt > 0u)
121 {
122 /* C = A + offset */
123 /* Add offset and then store the results in the destination buffer. */
124 *pDst++ = (q15_t) __SSAT(((q31_t) * pSrc++ + offset), 16);
125
126 /* Decrement the loop counter */
127 blkCnt--;
128 }
129
130 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
131
132 }
133
134 /**
135 * @} end of offset group
136 */