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| author | jaseg <git-bigdata-wsl-arch@jaseg.de> | 2020-05-03 19:53:02 +0200 |
|---|---|---|
| committer | jaseg <git-bigdata-wsl-arch@jaseg.de> | 2020-05-03 19:53:02 +0200 |
| commit | 2628932a40d769d8d0180ba6fed1e7b9b2718982 (patch) | |
| tree | ea485897653003d01cd16e2b506f69363928fafa /Blink/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_cos_q15.c | |
| parent | 972da3c0fd449dd6153edaf3c56e0c50d16b726b (diff) | |
| download | minikbd-2628932a40d769d8d0180ba6fed1e7b9b2718982.tar.gz minikbd-2628932a40d769d8d0180ba6fed1e7b9b2718982.tar.bz2 minikbd-2628932a40d769d8d0180ba6fed1e7b9b2718982.zip | |
minkbd: repo restructure
Diffstat (limited to 'Blink/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_cos_q15.c')
| -rw-r--r-- | Blink/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_cos_q15.c | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/Blink/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_cos_q15.c b/Blink/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_cos_q15.c deleted file mode 100644 index 036c5d7..0000000 --- a/Blink/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_cos_q15.c +++ /dev/null @@ -1,84 +0,0 @@ -/* ----------------------------------------------------------------------
- * Project: CMSIS DSP Library
- * Title: arm_cos_q15.c
- * Description: Fast cosine calculation for Q15 values
- *
- * $Date: 27. January 2017
- * $Revision: V.1.5.1
- *
- * Target Processor: Cortex-M cores
- * -------------------------------------------------------------------- */
-/*
- * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved.
- *
- * SPDX-License-Identifier: Apache-2.0
- *
- * Licensed under the Apache License, Version 2.0 (the License); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an AS IS BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "arm_math.h"
-#include "arm_common_tables.h"
-
-/**
- * @ingroup groupFastMath
- */
-
- /**
- * @addtogroup cos
- * @{
- */
-
-/**
- * @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)
-{
- q15_t cosVal; /* Temporary variables for input, output */
- int32_t index; /* Index variables */
- q15_t a, b; /* Four nearest output values */
- q15_t fract; /* Temporary values for fractional values */
-
- /* add 0.25 (pi/2) to read sine table */
- x = (uint16_t)x + 0x2000;
- if (x < 0)
- { /* convert negative numbers to corresponding positive ones */
- x = (uint16_t)x + 0x8000;
- }
-
- /* Calculate the nearest index */
- index = (uint32_t)x >> FAST_MATH_Q15_SHIFT;
-
- /* Calculation of fractional value */
- fract = (x - (index << FAST_MATH_Q15_SHIFT)) << 9;
-
- /* Read two nearest values of input value from the sin table */
- a = sinTable_q15[index];
- b = sinTable_q15[index+1];
-
- /* Linear interpolation process */
- cosVal = (q31_t)(0x8000-fract)*a >> 16;
- cosVal = (q15_t)((((q31_t)cosVal << 16) + ((q31_t)fract*b)) >> 16);
-
- return cosVal << 1;
-}
-
-/**
- * @} end of cos group
- */
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