diff options
Diffstat (limited to 'tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ControllerFunctions/arm_sin_cos_f32.c')
-rw-r--r-- | tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ControllerFunctions/arm_sin_cos_f32.c | 436 |
1 files changed, 436 insertions, 0 deletions
diff --git a/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ControllerFunctions/arm_sin_cos_f32.c b/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ControllerFunctions/arm_sin_cos_f32.c new file mode 100644 index 0000000000..4658f9a2a7 --- /dev/null +++ b/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/ControllerFunctions/arm_sin_cos_f32.c @@ -0,0 +1,436 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2013 ARM Limited. All rights reserved. +* +* $Date: 17. January 2013 +* $Revision: V1.4.1 +* +* Project: CMSIS DSP Library +* Title: arm_sin_cos_f32.c +* +* Description: Sine and Cosine calculation for floating-point values. +* +* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 +* +* Redistribution and use in source and binary forms, with or without +* modification, are permitted provided that the following conditions +* are met: +* - Redistributions of source code must retain the above copyright +* notice, this list of conditions and the following disclaimer. +* - Redistributions in binary form must reproduce the above copyright +* notice, this list of conditions and the following disclaimer in +* the documentation and/or other materials provided with the +* distribution. +* - Neither the name of ARM LIMITED nor the names of its contributors +* may be used to endorse or promote products derived from this +* software without specific prior written permission. +* +* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS +* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE +* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, +* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, +* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER +* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +* POSSIBILITY OF SUCH DAMAGE. +* -------------------------------------------------------------------- */ + +#include "arm_math.h" + +/** + * @ingroup groupController + */ + +/** + * @defgroup SinCos Sine Cosine + * + * Computes the trigonometric sine and cosine values using a combination of table lookup + * and linear interpolation. + * There are separate functions for Q31 and floating-point data types. + * The input to the floating-point version is in degrees while the + * fixed-point Q31 have a scaled input with the range + * [-1 0.9999] mapping to [-180 179] degrees. + * + * The implementation is based on table lookup using 360 values together with linear interpolation. + * The steps used are: + * -# Calculation of the nearest integer table index. + * -# Compute the fractional portion (fract) of the input. + * -# Fetch the value corresponding to \c index from sine table to \c y0 and also value from \c index+1 to \c y1. + * -# Sine value is computed as <code> *psinVal = y0 + (fract * (y1 - y0))</code>. + * -# Fetch the value corresponding to \c index from cosine table to \c y0 and also value from \c index+1 to \c y1. + * -# Cosine value is computed as <code> *pcosVal = y0 + (fract * (y1 - y0))</code>. + */ + + /** + * @addtogroup SinCos + * @{ + */ + + +/** +* \par +* Cosine Table is generated from following loop +* <pre>for(i = 0; i < 360; i++) +* { +* cosTable[i]= cos((i-180) * PI/180.0); +* } </pre> +*/ + +static const float32_t cosTable[360] = { + 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-0.857167300702112220f, -0.866025403784438710f, -0.874619707139395740f, + -0.882947592858926770f, -0.891006524188367790f, -0.898794046299167040f, + -0.906307787036649940f, -0.913545457642600760f, + -0.920504853452440150f, -0.927183854566787310f, -0.933580426497201740f, + -0.939692620785908320f, -0.945518575599316740f, -0.951056516295153530f, + -0.956304755963035440f, -0.961261695938318670f, + -0.965925826289068200f, -0.970295726275996470f, -0.974370064785235250f, + -0.978147600733805690f, -0.981627183447663980f, -0.984807753012208020f, + -0.987688340595137660f, -0.990268068741570250f, + -0.992546151641321980f, -0.994521895368273290f, -0.996194698091745550f, + -0.997564050259824200f, -0.998629534754573830f, -0.999390827019095760f, + -0.999847695156391270f, -1.000000000000000000f +}; + +/** +* \par +* Sine Table is generated from following loop +* <pre>for(i = 0; i < 360; i++) +* { +* sinTable[i]= sin((i-180) * PI/180.0); +* } </pre> +*/ + + +static const float32_t sinTable[360] = { + 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0.529919264233204900f, + 0.515038074910054380f, 0.499999999999999940f, 0.484809620246337170f, + 0.469471562785891080f, 0.453990499739546860f, 0.438371146789077290f, + 0.422618261740699500f, 0.406736643075800430f, + 0.390731128489274160f, 0.374606593415912240f, 0.358367949545300210f, + 0.342020143325668880f, 0.325568154457156980f, 0.309016994374947510f, + 0.292371704722737050f, 0.275637355816999660f, + 0.258819045102521020f, 0.241921895599667730f, 0.224951054343864780f, + 0.207911690817759310f, 0.190808995376544970f, 0.173648177666930280f, + 0.156434465040230980f, 0.139173100960065740f, + 0.121869343405147550f, 0.104528463267653730f, 0.087155742747658638f, + 0.069756473744125524f, 0.052335956242943807f, 0.034899496702500699f, + 0.017452406437283439f, 0.000000000000000122f +}; + + +/** + * @brief Floating-point sin_cos function. + * @param[in] theta input value in degrees + * @param[out] *pSinVal points to the processed sine output. + * @param[out] *pCosVal points to the processed cos output. + * @return none. + */ + + +void arm_sin_cos_f32( + float32_t theta, + float32_t * pSinVal, + float32_t * pCosVal) +{ + int32_t i; /* Index for reading nearwst output values */ + float32_t x1 = -179.0f; /* Initial input value */ + float32_t y0, y1; /* nearest output values */ + float32_t y2, y3; + float32_t fract; /* fractional part of input */ + + /* Calculation of fractional part */ + if(theta > 0.0f) + { + fract = theta - (float32_t) ((int32_t) theta); + } + else + { + fract = (theta - (float32_t) ((int32_t) theta)) + 1.0f; + } + + /* index calculation for reading nearest output values */ + i = (uint32_t) (theta - x1); + + /* Checking min and max index of table */ + if(i < 0) + { + i = 0; + } + else if(i >= 359) + { + i = 358; + } + + /* reading nearest sine output values */ + y0 = sinTable[i]; + y1 = sinTable[i + 1u]; + + /* reading nearest cosine output values */ + y2 = cosTable[i]; + y3 = cosTable[i + 1u]; + + y1 = y1 - y0; + y3 = y3 - y2; + + y1 = fract * y1; + y3 = fract * y3; + + /* Calculation of sine value */ + *pSinVal = y0 + y1; + + /* Calculation of cosine value */ + *pCosVal = y2 + y3; + +} + +/** + * @} end of SinCos group + */ |