Eli Hughes / CMSIS_DSP_401

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_q15.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?

UserRevisionLine numberNew contents of line
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_q15.c
emh203 0:3d9c67d97d6f 9 *
emh203 0:3d9c67d97d6f 10 * Description: Fast sine calculation for Q15 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 Q15 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 Q15 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
emh203 0:3d9c67d97d6f 61 q15_t arm_sin_q15(
emh203 0:3d9c67d97d6f 62 q15_t x)
emh203 0:3d9c67d97d6f 63 {
emh203 0:3d9c67d97d6f 64 q15_t sinVal; /* Temporary variables for input, output */
emh203 0:3d9c67d97d6f 65 int32_t index; /* Index variables */
emh203 0:3d9c67d97d6f 66 q15_t a, b; /* Four nearest output values */
emh203 0:3d9c67d97d6f 67 q15_t fract; /* Temporary values for fractional values */
emh203 0:3d9c67d97d6f 68
emh203 0:3d9c67d97d6f 69 /* Calculate the nearest index */
emh203 0:3d9c67d97d6f 70 index = (uint32_t)x >> FAST_MATH_Q15_SHIFT;
emh203 0:3d9c67d97d6f 71
emh203 0:3d9c67d97d6f 72 /* Calculation of fractional value */
emh203 0:3d9c67d97d6f 73 fract = (x - (index << FAST_MATH_Q15_SHIFT)) << 9;
emh203 0:3d9c67d97d6f 74
emh203 0:3d9c67d97d6f 75 /* Read two nearest values of input value from the sin table */
emh203 0:3d9c67d97d6f 76 a = sinTable_q15[index];
emh203 0:3d9c67d97d6f 77 b = sinTable_q15[index+1];
emh203 0:3d9c67d97d6f 78
emh203 0:3d9c67d97d6f 79 /* Linear interpolation process */
emh203 0:3d9c67d97d6f 80 sinVal = (q31_t)(0x8000-fract)*a >> 16;
emh203 0:3d9c67d97d6f 81 sinVal = (q15_t)((((q31_t)sinVal << 16) + ((q31_t)fract*b)) >> 16);
emh203 0:3d9c67d97d6f 82
emh203 0:3d9c67d97d6f 83 return sinVal << 1;
emh203 0:3d9c67d97d6f 84 }
emh203 0:3d9c67d97d6f 85
emh203 0:3d9c67d97d6f 86 /**
emh203 0:3d9c67d97d6f 87 * @} end of sin group
emh203 0:3d9c67d97d6f 88 */