diff options
Diffstat (limited to 'hid-dials/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sqrt_q15.c')
| -rw-r--r-- | hid-dials/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sqrt_q15.c | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/hid-dials/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sqrt_q15.c b/hid-dials/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sqrt_q15.c deleted file mode 100644 index 83e4ddd..0000000 --- a/hid-dials/Drivers/CMSIS/DSP/Source/FastMathFunctions/arm_sqrt_q15.c +++ /dev/null @@ -1,144 +0,0 @@ -/* ----------------------------------------------------------------------
- * Project: CMSIS DSP Library
- * Title: arm_sqrt_q15.c
- * Description: Q15 square root function
- *
- * $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 SQRT
- * @{
- */
-
- /**
- * @brief Q15 square root function.
- * @param[in] in input value. The range of the input value is [0 +1) or 0x0000 to 0x7FFF.
- * @param[out] *pOut square root of input value.
- * @return The function returns ARM_MATH_SUCCESS if the input value is positive
- * and ARM_MATH_ARGUMENT_ERROR if the input is negative. For
- * negative inputs, the function returns *pOut = 0.
- */
-
-arm_status arm_sqrt_q15(
- q15_t in,
- q15_t * pOut)
-{
- q15_t number, temp1, var1, signBits1, half;
- q31_t bits_val1;
- float32_t temp_float1;
- union
- {
- q31_t fracval;
- float32_t floatval;
- } tempconv;
-
- number = in;
-
- /* If the input is a positive number then compute the signBits. */
- if (number > 0)
- {
- signBits1 = __CLZ(number) - 17;
-
- /* Shift by the number of signBits1 */
- if ((signBits1 % 2) == 0)
- {
- number = number << signBits1;
- }
- else
- {
- number = number << (signBits1 - 1);
- }
-
- /* Calculate half value of the number */
- half = number >> 1;
- /* Store the number for later use */
- temp1 = number;
-
- /* Convert to float */
- temp_float1 = number * 3.051757812500000e-005f;
- /*Store as integer */
- tempconv.floatval = temp_float1;
- bits_val1 = tempconv.fracval;
- /* Subtract the shifted value from the magic number to give intial guess */
- bits_val1 = 0x5f3759df - (bits_val1 >> 1); /* gives initial guess */
- /* Store as float */
- tempconv.fracval = bits_val1;
- temp_float1 = tempconv.floatval;
- /* Convert to integer format */
- var1 = (q31_t) (temp_float1 * 16384);
-
- /* 1st iteration */
- var1 = ((q15_t) ((q31_t) var1 * (0x3000 -
- ((q15_t)
- ((((q15_t)
- (((q31_t) var1 * var1) >> 15)) *
- (q31_t) half) >> 15))) >> 15)) << 2;
- /* 2nd iteration */
- var1 = ((q15_t) ((q31_t) var1 * (0x3000 -
- ((q15_t)
- ((((q15_t)
- (((q31_t) var1 * var1) >> 15)) *
- (q31_t) half) >> 15))) >> 15)) << 2;
- /* 3rd iteration */
- var1 = ((q15_t) ((q31_t) var1 * (0x3000 -
- ((q15_t)
- ((((q15_t)
- (((q31_t) var1 * var1) >> 15)) *
- (q31_t) half) >> 15))) >> 15)) << 2;
-
- /* Multiply the inverse square root with the original value */
- var1 = ((q15_t) (((q31_t) temp1 * var1) >> 15)) << 1;
-
- /* Shift the output down accordingly */
- if ((signBits1 % 2) == 0)
- {
- var1 = var1 >> (signBits1 / 2);
- }
- else
- {
- var1 = var1 >> ((signBits1 - 1) / 2);
- }
- *pOut = var1;
-
- return (ARM_MATH_SUCCESS);
- }
- /* If the number is a negative number then store zero as its square root value */
- else
- {
- *pOut = 0;
- return (ARM_MATH_ARGUMENT_ERROR);
- }
-}
-
-/**
- * @} end of SQRT group
- */
|