+++ /dev/null
-/* ----------------------------------------------------------------------------
-* Copyright (C) 2010-2013 ARM Limited. All rights reserved.
-*
-* $Date: 17. January 2013
-* $Revision: V1.4.1
-*
-* Project: CMSIS DSP Library
-* Title: arm_float_to_q15.c
-*
-* Description: Converts the elements of the floating-point vector to Q15 vector.
-*
-* 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 groupSupport
- */
-
-/**
- * @addtogroup float_to_x
- * @{
- */
-
-/**
- * @brief Converts the elements of the floating-point vector to Q15 vector.
- * @param[in] *pSrc points to the floating-point input vector
- * @param[out] *pDst points to the Q15 output vector
- * @param[in] blockSize length of the input vector
- * @return none.
- *
- * \par Description:
- * \par
- * The equation used for the conversion process is:
- * <pre>
- * pDst[n] = (q15_t)(pSrc[n] * 32768); 0 <= n < blockSize.
- * </pre>
- * \par Scaling and Overflow Behavior:
- * \par
- * The function uses saturating arithmetic.
- * Results outside of the allowable Q15 range [0x8000 0x7FFF] will be saturated.
- * \note
- * In order to apply rounding, the library should be rebuilt with the ROUNDING macro
- * defined in the preprocessor section of project options.
- *
- */
-
-
-void arm_float_to_q15(
- float32_t * pSrc,
- q15_t * pDst,
- uint32_t blockSize)
-{
- float32_t *pIn = pSrc; /* Src pointer */
- uint32_t blkCnt; /* loop counter */
-
-#ifdef ARM_MATH_ROUNDING
-
- float32_t in;
-
-#endif /* #ifdef ARM_MATH_ROUNDING */
-
-#ifndef ARM_MATH_CM0_FAMILY
-
- /* Run the below code for Cortex-M4 and Cortex-M3 */
-
- /*loop Unrolling */
- blkCnt = blockSize >> 2u;
-
- /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
- ** a second loop below computes the remaining 1 to 3 samples. */
- while(blkCnt > 0u)
- {
-
-#ifdef ARM_MATH_ROUNDING
- /* C = A * 32768 */
- /* convert from float to q15 and then store the results in the destination buffer */
- in = *pIn++;
- in = (in * 32768.0f);
- in += in > 0 ? 0.5 : -0.5;
- *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16));
-
- in = *pIn++;
- in = (in * 32768.0f);
- in += in > 0 ? 0.5 : -0.5;
- *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16));
-
- in = *pIn++;
- in = (in * 32768.0f);
- in += in > 0 ? 0.5 : -0.5;
- *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16));
-
- in = *pIn++;
- in = (in * 32768.0f);
- in += in > 0 ? 0.5 : -0.5;
- *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16));
-
-#else
-
- /* C = A * 32768 */
- /* convert from float to q15 and then store the results in the destination buffer */
- *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16);
- *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16);
- *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16);
- *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16);
-
-#endif /* #ifdef ARM_MATH_ROUNDING */
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
- /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
- ** No loop unrolling is used. */
- blkCnt = blockSize % 0x4u;
-
- while(blkCnt > 0u)
- {
-
-#ifdef ARM_MATH_ROUNDING
- /* C = A * 32768 */
- /* convert from float to q15 and then store the results in the destination buffer */
- in = *pIn++;
- in = (in * 32768.0f);
- in += in > 0 ? 0.5 : -0.5;
- *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16));
-
-#else
-
- /* C = A * 32768 */
- /* convert from float to q15 and then store the results in the destination buffer */
- *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16);
-
-#endif /* #ifdef ARM_MATH_ROUNDING */
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
-
-#else
-
- /* Run the below code for Cortex-M0 */
-
- /* Loop over blockSize number of values */
- blkCnt = blockSize;
-
- while(blkCnt > 0u)
- {
-
-#ifdef ARM_MATH_ROUNDING
- /* C = A * 32768 */
- /* convert from float to q15 and then store the results in the destination buffer */
- in = *pIn++;
- in = (in * 32768.0f);
- in += in > 0 ? 0.5f : -0.5f;
- *pDst++ = (q15_t) (__SSAT((q31_t) (in), 16));
-
-#else
-
- /* C = A * 32768 */
- /* convert from float to q15 and then store the results in the destination buffer */
- *pDst++ = (q15_t) __SSAT((q31_t) (*pIn++ * 32768.0f), 16);
-
-#endif /* #ifdef ARM_MATH_ROUNDING */
-
- /* Decrement the loop counter */
- blkCnt--;
- }
-
-#endif /* #ifndef ARM_MATH_CM0_FAMILY */
-
-}
-
-/**
- * @} end of float_to_x group
- */
projects / qmk_firmware.git / blobdiff