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Diffstat (limited to 'platform/CMSIS/DSP_Lib/Source/ControllerFunctions/arm_sin_cos_q31.c')
| -rw-r--r-- | platform/CMSIS/DSP_Lib/Source/ControllerFunctions/arm_sin_cos_q31.c | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/platform/CMSIS/DSP_Lib/Source/ControllerFunctions/arm_sin_cos_q31.c b/platform/CMSIS/DSP_Lib/Source/ControllerFunctions/arm_sin_cos_q31.c new file mode 100644 index 0000000..6b7dff9 --- /dev/null +++ b/platform/CMSIS/DSP_Lib/Source/ControllerFunctions/arm_sin_cos_q31.c @@ -0,0 +1,122 @@ +/* ---------------------------------------------------------------------- +* Copyright (C) 2010-2014 ARM Limited. All rights reserved. +* +* $Date: 12. March 2014 +* $Revision: V1.4.4 +* +* Project: CMSIS DSP Library +* Title: arm_sin_cos_q31.c +* +* Description: Cosine & Sine calculation for Q31 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" +#include "arm_common_tables.h" + +/** + * @ingroup groupController + */ + + /** + * @addtogroup SinCos + * @{ + */ + +/** + * @brief Q31 sin_cos function. + * @param[in] theta scaled input value in degrees + * @param[out] *pSinVal points to the processed sine output. + * @param[out] *pCosVal points to the processed cosine output. + * @return none. + * + * The Q31 input value is in the range [-1 0.999999] and is mapped to a degree value in the range [-180 179]. + * + */ + +void arm_sin_cos_q31( + q31_t theta, + q31_t * pSinVal, + q31_t * pCosVal) +{ + q31_t fract; /* Temporary variables for input, output */ + uint16_t indexS, indexC; /* Index variable */ + q31_t f1, f2, d1, d2; /* Two nearest output values */ + q31_t Dn, Df; + q63_t temp; + + /* Calculate the nearest index */ + indexS = (uint32_t)theta >> CONTROLLER_Q31_SHIFT; + indexC = (indexS + 128) & 0x1ff; + + /* Calculation of fractional value */ + fract = (theta - (indexS << CONTROLLER_Q31_SHIFT)) << 8; + + /* Read two nearest values of input value from the cos & sin tables */ + f1 = sinTable_q31[indexC+0]; + f2 = sinTable_q31[indexC+1]; + d1 = -sinTable_q31[indexS+0]; + d2 = -sinTable_q31[indexS+1]; + + Dn = 0x1921FB5; // delta between the two points (fixed), in this case 2*pi/FAST_MATH_TABLE_SIZE + Df = f2 - f1; // delta between the values of the functions + temp = Dn*((q63_t)d1 + d2); + temp = temp - ((q63_t)Df << 32); + temp = (q63_t)fract*(temp >> 31); + temp = temp + ((3*(q63_t)Df << 31) - (d2 + ((q63_t)d1 << 1))*Dn); + temp = (q63_t)fract*(temp >> 31); + temp = temp + (q63_t)d1*Dn; + temp = (q63_t)fract*(temp >> 31); + + /* Calculation of cosine value */ + *pCosVal = clip_q63_to_q31((temp >> 31) + (q63_t)f1); + + /* Read two nearest values of input value from the cos & sin tables */ + f1 = sinTable_q31[indexS+0]; + f2 = sinTable_q31[indexS+1]; + d1 = sinTable_q31[indexC+0]; + d2 = sinTable_q31[indexC+1]; + + Df = f2 - f1; // delta between the values of the functions + temp = Dn*((q63_t)d1 + d2); + temp = temp - ((q63_t)Df << 32); + temp = (q63_t)fract*(temp >> 31); + temp = temp + ((3*(q63_t)Df << 31) - (d2 + ((q63_t)d1 << 1))*Dn); + temp = (q63_t)fract*(temp >> 31); + temp = temp + (q63_t)d1*Dn; + temp = (q63_t)fract*(temp >> 31); + + /* Calculation of sine value */ + *pSinVal = clip_q63_to_q31((temp >> 31) + (q63_t)f1); +} + +/** + * @} end of SinCos group + */ |