text: /* ----------------------------------------------------------------------------
  * Copyright (C) 2010-2014 ARM Limited. All rights reserved.
  *
  * $Date: 16/10/14 6:01p $Revision:  V.1.4.5
  *
  * Project:      CMSIS DSP Library
  * Title:        arm_q15_to_float.c
  *
  * Description:  Converts the elements of the Q15 vector to floating-point 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
   */
  
  /**
   * @defgroup q15_to_x  Convert 16-bit Integer value
   */
  
  /**
   * @addtogroup q15_to_x
   * @{
   */
  
  
  
  
  /**
   * @brief  Converts the elements of the Q15 vector to floating-point vector.
   * @param[in]       *pSrc points to the Q15 input vector
   * @param[out]      *pDst points to the floating-point output vector
   * @param[in]       blockSize length of the input vector
   * @return none.
   *
   * \par Description:
   *
   * The equation used for the conversion process is:
   *
   * <pre>
   *  pDst[n] = (float32_t) pSrc[n] / 32768;   0 <= n < blockSize.
   * </pre>
   *
   */
  
  
  void arm_q15_to_float(
      q15_t * pSrc,
      float32_t * pDst,
      uint32_t blockSize)
  {
      q15_t *pIn = pSrc;                             /* Src pointer */
      uint32_t blkCnt;                               /* loop counter */
  
  
  #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)
      {
          /* C = (float32_t) A / 32768 */
          /* convert from q15 to float and then store the results in the destination buffer */
          *pDst++ = ((float32_t) * pIn++ / 32768.0f);
          *pDst++ = ((float32_t) * pIn++ / 32768.0f);
          *pDst++ = ((float32_t) * pIn++ / 32768.0f);
          *pDst++ = ((float32_t) * pIn++ / 32768.0f);
  
          /* 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;
  
  #else
  
      /* Run the below code for Cortex-M0 */
  
      /* Loop over blockSize number of values */
      blkCnt = blockSize;
  
  #endif /* #ifndef ARM_MATH_CM0_FAMILY */
  
      while(blkCnt > 0u)
      {
          /* C = (float32_t) A / 32768 */
          /* convert from q15 to float and then store the results in the destination buffer */
          *pDst++ = ((float32_t) * pIn++ / 32768.0f);
  
          /* Decrement the loop counter */
          blkCnt--;
      }
  }
  
  /**
   * @} end of q15_to_x group
   */
  