diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FastMathFunctions/arm_cos_q15.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FastMathFunctions/arm_cos_q15.c | 214 |
1 files changed, 0 insertions, 214 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FastMathFunctions/arm_cos_q15.c b/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FastMathFunctions/arm_cos_q15.c deleted file mode 100644 index ffc0929f72..0000000000 --- a/tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/FastMathFunctions/arm_cos_q15.c +++ /dev/null @@ -1,214 +0,0 @@ -/* ---------------------------------------------------------------------- -* Copyright (C) 2010-2013 ARM Limited. All rights reserved. -* -* $Date: 17. January 2013 -* $Revision: V1.4.1 -* -* Project: CMSIS DSP Library -* Title: arm_cos_q15.c -* -* Description: Fast cosine calculation for Q15 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 groupFastMath - */ - - /** - * @addtogroup cos - * @{ - */ - -/** -* \par - * Table values are in Q15 (1.15 fixed-point format) and generation is done in - * three steps. First, generate cos values in floating point: - * <pre> - * tableSize = 256; - * for(n = -1; n < (tableSize + 1); n++) - * { - * cosTable[n+1]= cos(2*pi*n/tableSize); - * } </pre> - * where pi value is 3.14159265358979 - * \par - * Second, convert floating-point to Q15 (fixed-point): - * (cosTable[i] * pow(2, 15)) - * \par - * Finally, round to the nearest integer value: - * cosTable[i] += (cosTable[i] > 0 ? 0.5 :-0.5); -*/ - -static const q15_t cosTableQ15[259] = { - 0x7ff6, 0x7fff, 0x7ff6, 0x7fd9, 0x7fa7, 0x7f62, 0x7f0a, 0x7e9d, - 0x7e1e, 0x7d8a, 0x7ce4, 0x7c2a, 0x7b5d, 0x7a7d, 0x798a, 0x7885, - 0x776c, 0x7642, 0x7505, 0x73b6, 0x7255, 0x70e3, 0x6f5f, 0x6dca, - 0x6c24, 0x6a6e, 0x68a7, 0x66d0, 0x64e9, 0x62f2, 0x60ec, 0x5ed7, - 0x5cb4, 0x5a82, 0x5843, 0x55f6, 0x539b, 0x5134, 0x4ec0, 0x4c40, - 0x49b4, 0x471d, 0x447b, 0x41ce, 0x3f17, 0x3c57, 0x398d, 0x36ba, - 0x33df, 0x30fc, 0x2e11, 0x2b1f, 0x2827, 0x2528, 0x2224, 0x1f1a, - 0x1c0c, 0x18f9, 0x15e2, 0x12c8, 0xfab, 0xc8c, 0x96b, 0x648, - 0x324, 0x0, 0xfcdc, 0xf9b8, 0xf695, 0xf374, 0xf055, 0xed38, - 0xea1e, 0xe707, 0xe3f4, 0xe0e6, 0xdddc, 0xdad8, 0xd7d9, 0xd4e1, - 0xd1ef, 0xcf04, 0xcc21, 0xc946, 0xc673, 0xc3a9, 0xc0e9, 0xbe32, - 0xbb85, 0xb8e3, 0xb64c, 0xb3c0, 0xb140, 0xaecc, 0xac65, 0xaa0a, - 0xa7bd, 0xa57e, 0xa34c, 0xa129, 0x9f14, 0x9d0e, 0x9b17, 0x9930, - 0x9759, 0x9592, 0x93dc, 0x9236, 0x90a1, 0x8f1d, 0x8dab, 0x8c4a, - 0x8afb, 0x89be, 0x8894, 0x877b, 0x8676, 0x8583, 0x84a3, 0x83d6, - 0x831c, 0x8276, 0x81e2, 0x8163, 0x80f6, 0x809e, 0x8059, 0x8027, - 0x800a, 0x8000, 0x800a, 0x8027, 0x8059, 0x809e, 0x80f6, 0x8163, - 0x81e2, 0x8276, 0x831c, 0x83d6, 0x84a3, 0x8583, 0x8676, 0x877b, - 0x8894, 0x89be, 0x8afb, 0x8c4a, 0x8dab, 0x8f1d, 0x90a1, 0x9236, - 0x93dc, 0x9592, 0x9759, 0x9930, 0x9b17, 0x9d0e, 0x9f14, 0xa129, - 0xa34c, 0xa57e, 0xa7bd, 0xaa0a, 0xac65, 0xaecc, 0xb140, 0xb3c0, - 0xb64c, 0xb8e3, 0xbb85, 0xbe32, 0xc0e9, 0xc3a9, 0xc673, 0xc946, - 0xcc21, 0xcf04, 0xd1ef, 0xd4e1, 0xd7d9, 0xdad8, 0xdddc, 0xe0e6, - 0xe3f4, 0xe707, 0xea1e, 0xed38, 0xf055, 0xf374, 0xf695, 0xf9b8, - 0xfcdc, 0x0, 0x324, 0x648, 0x96b, 0xc8c, 0xfab, 0x12c8, - 0x15e2, 0x18f9, 0x1c0c, 0x1f1a, 0x2224, 0x2528, 0x2827, 0x2b1f, - 0x2e11, 0x30fc, 0x33df, 0x36ba, 0x398d, 0x3c57, 0x3f17, 0x41ce, - 0x447b, 0x471d, 0x49b4, 0x4c40, 0x4ec0, 0x5134, 0x539b, 0x55f6, - 0x5843, 0x5a82, 0x5cb4, 0x5ed7, 0x60ec, 0x62f2, 0x64e9, 0x66d0, - 0x68a7, 0x6a6e, 0x6c24, 0x6dca, 0x6f5f, 0x70e3, 0x7255, 0x73b6, - 0x7505, 0x7642, 0x776c, 0x7885, 0x798a, 0x7a7d, 0x7b5d, 0x7c2a, - 0x7ce4, 0x7d8a, 0x7e1e, 0x7e9d, 0x7f0a, 0x7f62, 0x7fa7, 0x7fd9, - 0x7ff6, 0x7fff, 0x7ff6 -}; - - -/** - * @brief Fast approximation to the trigonometric cosine function for Q15 data. - * @param[in] x Scaled input value in radians. - * @return cos(x). - * - * The Q15 input value is in the range [0 +0.9999] and is mapped to a radian - * value in the range [0 2*pi). - */ - -q15_t arm_cos_q15( - q15_t x) -{ - q31_t cosVal; /* Temporary variable for output */ - q15_t *tablePtr; /* Pointer to table */ - q15_t in, in2; /* Temporary variables for input */ - q31_t wa, wb, wc, wd; /* Cubic interpolation coefficients */ - q15_t a, b, c, d; /* Four nearest output values */ - q15_t fract, fractCube, fractSquare; /* Variables for fractional value */ - q15_t oneBy6 = 0x1555; /* Fixed point value of 1/6 */ - q15_t tableSpacing = TABLE_SPACING_Q15; /* Table spacing */ - int32_t index; /* Index variable */ - - in = x; - - /* Calculate the nearest index */ - index = (int32_t) in / tableSpacing; - - /* Calculate the nearest value of input */ - in2 = (q15_t) index *tableSpacing; - - /* Calculation of fractional value */ - fract = (in - in2) << 8; - - /* fractSquare = fract * fract */ - fractSquare = (q15_t) ((fract * fract) >> 15); - - /* fractCube = fract * fract * fract */ - fractCube = (q15_t) ((fractSquare * fract) >> 15); - - /* Checking min and max index of table */ - if(index < 0) - { - index = 0; - } - else if(index > 256) - { - index = 256; - } - - /* Initialise table pointer */ - tablePtr = (q15_t *) & cosTableQ15[index]; - - /* Cubic interpolation process */ - /* Calculation of wa */ - /* wa = -(oneBy6)*fractCube + (fractSquare >> 1u) - (0x2AAA)*fract; */ - wa = (q31_t) oneBy6 *fractCube; - wa += (q31_t) 0x2AAA *fract; - wa = -(wa >> 15); - wa += (fractSquare >> 1u); - - /* Read first nearest value of output from the cos table */ - a = *tablePtr++; - - /* cosVal = a * wa */ - cosVal = a * wa; - - /* Calculation of wb */ - wb = (((fractCube >> 1u) - fractSquare) - (fract >> 1u)) + 0x7FFF; - - /* Read second nearest value of output from the cos table */ - b = *tablePtr++; - - /* cosVal += b*wb */ - cosVal += b * wb; - - /* Calculation of wc */ - wc = -(q31_t) fractCube + fractSquare; - wc = (wc >> 1u) + fract; - - /* Read third nearest value of output from the cos table */ - c = *tablePtr++; - - /* cosVal += c*wc */ - cosVal += c * wc; - - /* Calculation of wd */ - /* wd = (oneBy6)*fractCube - (oneBy6)*fract; */ - fractCube = fractCube - fract; - wd = ((q15_t) (((q31_t) oneBy6 * fractCube) >> 15)); - - /* Read fourth nearest value of output from the cos table */ - d = *tablePtr++; - - /* cosVal += d*wd; */ - cosVal += d * wd; - - /* Convert output value in 1.15(q15) format and saturate */ - cosVal = __SSAT((cosVal >> 15), 16); - - /* Return the output value in 1.15(q15) format */ - return ((q15_t) cosVal); - -} - -/** - * @} end of cos group - */ |