CMSIS DSP library
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cmsis_dsp/FastMathFunctions/arm_sin_q15.c@5:3762170b6d4d, 2015-11-20 (annotated)
- Committer:
- mbed_official
- Date:
- Fri Nov 20 08:45:18 2015 +0000
- Revision:
- 5:3762170b6d4d
- Parent:
- 3:7a284390b0ce
Synchronized with git revision 2eb940b9a73af188d3004a2575fdfbb05febe62b
Full URL: https://github.com/mbedmicro/mbed/commit/2eb940b9a73af188d3004a2575fdfbb05febe62b/
Added option to build rpc library. closes #1426
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
emilmont | 1:fdd22bb7aa52 | 1 | /* ---------------------------------------------------------------------- |
mbed_official | 5:3762170b6d4d | 2 | * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
emilmont | 1:fdd22bb7aa52 | 3 | * |
mbed_official | 5:3762170b6d4d | 4 | * $Date: 19. March 2015 |
mbed_official | 5:3762170b6d4d | 5 | * $Revision: V.1.4.5 |
emilmont | 1:fdd22bb7aa52 | 6 | * |
emilmont | 2:da51fb522205 | 7 | * Project: CMSIS DSP Library |
emilmont | 2:da51fb522205 | 8 | * Title: arm_sin_q15.c |
emilmont | 1:fdd22bb7aa52 | 9 | * |
emilmont | 2:da51fb522205 | 10 | * Description: Fast sine calculation for Q15 values. |
emilmont | 1:fdd22bb7aa52 | 11 | * |
emilmont | 1:fdd22bb7aa52 | 12 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
emilmont | 1:fdd22bb7aa52 | 13 | * |
mbed_official | 3:7a284390b0ce | 14 | * Redistribution and use in source and binary forms, with or without |
mbed_official | 3:7a284390b0ce | 15 | * modification, are permitted provided that the following conditions |
mbed_official | 3:7a284390b0ce | 16 | * are met: |
mbed_official | 3:7a284390b0ce | 17 | * - Redistributions of source code must retain the above copyright |
mbed_official | 3:7a284390b0ce | 18 | * notice, this list of conditions and the following disclaimer. |
mbed_official | 3:7a284390b0ce | 19 | * - Redistributions in binary form must reproduce the above copyright |
mbed_official | 3:7a284390b0ce | 20 | * notice, this list of conditions and the following disclaimer in |
mbed_official | 3:7a284390b0ce | 21 | * the documentation and/or other materials provided with the |
mbed_official | 3:7a284390b0ce | 22 | * distribution. |
mbed_official | 3:7a284390b0ce | 23 | * - Neither the name of ARM LIMITED nor the names of its contributors |
mbed_official | 3:7a284390b0ce | 24 | * may be used to endorse or promote products derived from this |
mbed_official | 3:7a284390b0ce | 25 | * software without specific prior written permission. |
mbed_official | 3:7a284390b0ce | 26 | * |
mbed_official | 3:7a284390b0ce | 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
mbed_official | 3:7a284390b0ce | 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
mbed_official | 3:7a284390b0ce | 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
mbed_official | 3:7a284390b0ce | 30 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
mbed_official | 3:7a284390b0ce | 31 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
mbed_official | 3:7a284390b0ce | 32 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
mbed_official | 3:7a284390b0ce | 33 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
mbed_official | 3:7a284390b0ce | 34 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
mbed_official | 3:7a284390b0ce | 35 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
mbed_official | 3:7a284390b0ce | 36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
mbed_official | 3:7a284390b0ce | 37 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
mbed_official | 3:7a284390b0ce | 38 | * POSSIBILITY OF SUCH DAMAGE. |
emilmont | 1:fdd22bb7aa52 | 39 | * -------------------------------------------------------------------- */ |
emilmont | 1:fdd22bb7aa52 | 40 | |
emilmont | 1:fdd22bb7aa52 | 41 | #include "arm_math.h" |
mbed_official | 5:3762170b6d4d | 42 | #include "arm_common_tables.h" |
emilmont | 1:fdd22bb7aa52 | 43 | |
emilmont | 1:fdd22bb7aa52 | 44 | /** |
emilmont | 1:fdd22bb7aa52 | 45 | * @ingroup groupFastMath |
emilmont | 1:fdd22bb7aa52 | 46 | */ |
emilmont | 1:fdd22bb7aa52 | 47 | |
emilmont | 1:fdd22bb7aa52 | 48 | /** |
emilmont | 1:fdd22bb7aa52 | 49 | * @addtogroup sin |
emilmont | 1:fdd22bb7aa52 | 50 | * @{ |
emilmont | 1:fdd22bb7aa52 | 51 | */ |
emilmont | 1:fdd22bb7aa52 | 52 | |
emilmont | 1:fdd22bb7aa52 | 53 | /** |
emilmont | 1:fdd22bb7aa52 | 54 | * @brief Fast approximation to the trigonometric sine function for Q15 data. |
emilmont | 1:fdd22bb7aa52 | 55 | * @param[in] x Scaled input value in radians. |
emilmont | 1:fdd22bb7aa52 | 56 | * @return sin(x). |
emilmont | 1:fdd22bb7aa52 | 57 | * |
mbed_official | 3:7a284390b0ce | 58 | * The Q15 input value is in the range [0 +0.9999] and is mapped to a radian value in the range [0 2*pi). |
emilmont | 1:fdd22bb7aa52 | 59 | */ |
emilmont | 1:fdd22bb7aa52 | 60 | |
emilmont | 1:fdd22bb7aa52 | 61 | q15_t arm_sin_q15( |
emilmont | 1:fdd22bb7aa52 | 62 | q15_t x) |
emilmont | 1:fdd22bb7aa52 | 63 | { |
mbed_official | 5:3762170b6d4d | 64 | q15_t sinVal; /* Temporary variables for input, output */ |
mbed_official | 5:3762170b6d4d | 65 | int32_t index; /* Index variables */ |
mbed_official | 5:3762170b6d4d | 66 | q15_t a, b; /* Four nearest output values */ |
mbed_official | 5:3762170b6d4d | 67 | q15_t fract; /* Temporary values for fractional values */ |
emilmont | 1:fdd22bb7aa52 | 68 | |
emilmont | 1:fdd22bb7aa52 | 69 | /* Calculate the nearest index */ |
mbed_official | 5:3762170b6d4d | 70 | index = (uint32_t)x >> FAST_MATH_Q15_SHIFT; |
emilmont | 1:fdd22bb7aa52 | 71 | |
emilmont | 1:fdd22bb7aa52 | 72 | /* Calculation of fractional value */ |
mbed_official | 5:3762170b6d4d | 73 | fract = (x - (index << FAST_MATH_Q15_SHIFT)) << 9; |
emilmont | 1:fdd22bb7aa52 | 74 | |
mbed_official | 5:3762170b6d4d | 75 | /* Read two nearest values of input value from the sin table */ |
mbed_official | 5:3762170b6d4d | 76 | a = sinTable_q15[index]; |
mbed_official | 5:3762170b6d4d | 77 | b = sinTable_q15[index+1]; |
emilmont | 1:fdd22bb7aa52 | 78 | |
mbed_official | 5:3762170b6d4d | 79 | /* Linear interpolation process */ |
mbed_official | 5:3762170b6d4d | 80 | sinVal = (q31_t)(0x8000-fract)*a >> 16; |
mbed_official | 5:3762170b6d4d | 81 | sinVal = (q15_t)((((q31_t)sinVal << 16) + ((q31_t)fract*b)) >> 16); |
emilmont | 1:fdd22bb7aa52 | 82 | |
mbed_official | 5:3762170b6d4d | 83 | return sinVal << 1; |
emilmont | 1:fdd22bb7aa52 | 84 | } |
emilmont | 1:fdd22bb7aa52 | 85 | |
emilmont | 1:fdd22bb7aa52 | 86 | /** |
emilmont | 1:fdd22bb7aa52 | 87 | * @} end of sin group |
emilmont | 1:fdd22bb7aa52 | 88 | */ |