V4.0.1 of the ARM CMSIS DSP libraries. Note that arm_bitreversal2.s, arm_cfft_f32.c and arm_rfft_fast_f32.c had to be removed. arm_bitreversal2.s will not assemble with the online tools. So, the fast f32 FFT functions are not yet available. All the other FFT functions are available.
Dependents: MPU9150_Example fir_f32 fir_f32 MPU9150_nucleo_noni2cdev ... more
FastMathFunctions/arm_sin_q31.c@0:3d9c67d97d6f, 2014-07-28 (annotated)
- Committer:
- emh203
- Date:
- Mon Jul 28 15:03:15 2014 +0000
- Revision:
- 0:3d9c67d97d6f
1st working commit. Had to remove arm_bitreversal2.s arm_cfft_f32.c and arm_rfft_fast_f32.c. The .s will not assemble. For now I removed these functions so we could at least have a library for the other functions.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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emh203 | 0:3d9c67d97d6f | 1 | /* ---------------------------------------------------------------------- |
emh203 | 0:3d9c67d97d6f | 2 | * Copyright (C) 2010-2014 ARM Limited. All rights reserved. |
emh203 | 0:3d9c67d97d6f | 3 | * |
emh203 | 0:3d9c67d97d6f | 4 | * $Date: 12. March 2014 |
emh203 | 0:3d9c67d97d6f | 5 | * $Revision: V1.4.3 |
emh203 | 0:3d9c67d97d6f | 6 | * |
emh203 | 0:3d9c67d97d6f | 7 | * Project: CMSIS DSP Library |
emh203 | 0:3d9c67d97d6f | 8 | * Title: arm_sin_q31.c |
emh203 | 0:3d9c67d97d6f | 9 | * |
emh203 | 0:3d9c67d97d6f | 10 | * Description: Fast sine calculation for Q31 values. |
emh203 | 0:3d9c67d97d6f | 11 | * |
emh203 | 0:3d9c67d97d6f | 12 | * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 |
emh203 | 0:3d9c67d97d6f | 13 | * |
emh203 | 0:3d9c67d97d6f | 14 | * Redistribution and use in source and binary forms, with or without |
emh203 | 0:3d9c67d97d6f | 15 | * modification, are permitted provided that the following conditions |
emh203 | 0:3d9c67d97d6f | 16 | * are met: |
emh203 | 0:3d9c67d97d6f | 17 | * - Redistributions of source code must retain the above copyright |
emh203 | 0:3d9c67d97d6f | 18 | * notice, this list of conditions and the following disclaimer. |
emh203 | 0:3d9c67d97d6f | 19 | * - Redistributions in binary form must reproduce the above copyright |
emh203 | 0:3d9c67d97d6f | 20 | * notice, this list of conditions and the following disclaimer in |
emh203 | 0:3d9c67d97d6f | 21 | * the documentation and/or other materials provided with the |
emh203 | 0:3d9c67d97d6f | 22 | * distribution. |
emh203 | 0:3d9c67d97d6f | 23 | * - Neither the name of ARM LIMITED nor the names of its contributors |
emh203 | 0:3d9c67d97d6f | 24 | * may be used to endorse or promote products derived from this |
emh203 | 0:3d9c67d97d6f | 25 | * software without specific prior written permission. |
emh203 | 0:3d9c67d97d6f | 26 | * |
emh203 | 0:3d9c67d97d6f | 27 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
emh203 | 0:3d9c67d97d6f | 28 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
emh203 | 0:3d9c67d97d6f | 29 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
emh203 | 0:3d9c67d97d6f | 30 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
emh203 | 0:3d9c67d97d6f | 31 | * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
emh203 | 0:3d9c67d97d6f | 32 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
emh203 | 0:3d9c67d97d6f | 33 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
emh203 | 0:3d9c67d97d6f | 34 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
emh203 | 0:3d9c67d97d6f | 35 | * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
emh203 | 0:3d9c67d97d6f | 36 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN |
emh203 | 0:3d9c67d97d6f | 37 | * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
emh203 | 0:3d9c67d97d6f | 38 | * POSSIBILITY OF SUCH DAMAGE. |
emh203 | 0:3d9c67d97d6f | 39 | * -------------------------------------------------------------------- */ |
emh203 | 0:3d9c67d97d6f | 40 | |
emh203 | 0:3d9c67d97d6f | 41 | #include "arm_math.h" |
emh203 | 0:3d9c67d97d6f | 42 | #include "arm_common_tables.h" |
emh203 | 0:3d9c67d97d6f | 43 | |
emh203 | 0:3d9c67d97d6f | 44 | /** |
emh203 | 0:3d9c67d97d6f | 45 | * @ingroup groupFastMath |
emh203 | 0:3d9c67d97d6f | 46 | */ |
emh203 | 0:3d9c67d97d6f | 47 | |
emh203 | 0:3d9c67d97d6f | 48 | /** |
emh203 | 0:3d9c67d97d6f | 49 | * @addtogroup sin |
emh203 | 0:3d9c67d97d6f | 50 | * @{ |
emh203 | 0:3d9c67d97d6f | 51 | */ |
emh203 | 0:3d9c67d97d6f | 52 | |
emh203 | 0:3d9c67d97d6f | 53 | /** |
emh203 | 0:3d9c67d97d6f | 54 | * @brief Fast approximation to the trigonometric sine function for Q31 data. |
emh203 | 0:3d9c67d97d6f | 55 | * @param[in] x Scaled input value in radians. |
emh203 | 0:3d9c67d97d6f | 56 | * @return sin(x). |
emh203 | 0:3d9c67d97d6f | 57 | * |
emh203 | 0:3d9c67d97d6f | 58 | * The Q31 input value is in the range [0 +0.9999] and is mapped to a radian value in the range [0 2*pi). */ |
emh203 | 0:3d9c67d97d6f | 59 | |
emh203 | 0:3d9c67d97d6f | 60 | q31_t arm_sin_q31( |
emh203 | 0:3d9c67d97d6f | 61 | q31_t x) |
emh203 | 0:3d9c67d97d6f | 62 | { |
emh203 | 0:3d9c67d97d6f | 63 | q31_t sinVal; /* Temporary variables for input, output */ |
emh203 | 0:3d9c67d97d6f | 64 | int32_t index; /* Index variables */ |
emh203 | 0:3d9c67d97d6f | 65 | q31_t a, b; /* Four nearest output values */ |
emh203 | 0:3d9c67d97d6f | 66 | q31_t fract; /* Temporary values for fractional values */ |
emh203 | 0:3d9c67d97d6f | 67 | |
emh203 | 0:3d9c67d97d6f | 68 | /* Calculate the nearest index */ |
emh203 | 0:3d9c67d97d6f | 69 | index = (uint32_t)x >> FAST_MATH_Q31_SHIFT; |
emh203 | 0:3d9c67d97d6f | 70 | |
emh203 | 0:3d9c67d97d6f | 71 | /* Calculation of fractional value */ |
emh203 | 0:3d9c67d97d6f | 72 | fract = (x - (index << FAST_MATH_Q31_SHIFT)) << 9; |
emh203 | 0:3d9c67d97d6f | 73 | |
emh203 | 0:3d9c67d97d6f | 74 | /* Read two nearest values of input value from the sin table */ |
emh203 | 0:3d9c67d97d6f | 75 | a = sinTable_q31[index]; |
emh203 | 0:3d9c67d97d6f | 76 | b = sinTable_q31[index+1]; |
emh203 | 0:3d9c67d97d6f | 77 | |
emh203 | 0:3d9c67d97d6f | 78 | /* Linear interpolation process */ |
emh203 | 0:3d9c67d97d6f | 79 | sinVal = (q63_t)(0x80000000-fract)*a >> 32; |
emh203 | 0:3d9c67d97d6f | 80 | sinVal = (q31_t)((((q63_t)sinVal << 32) + ((q63_t)fract*b)) >> 32); |
emh203 | 0:3d9c67d97d6f | 81 | |
emh203 | 0:3d9c67d97d6f | 82 | return sinVal << 1; |
emh203 | 0:3d9c67d97d6f | 83 | } |
emh203 | 0:3d9c67d97d6f | 84 | |
emh203 | 0:3d9c67d97d6f | 85 | /** |
emh203 | 0:3d9c67d97d6f | 86 | * @} end of sin group |
emh203 | 0:3d9c67d97d6f | 87 | */ |