Diff: cmsis_dsp/TransformFunctions/arm_bitreversal.c

Revision:

3:7a284390b0ce

Parent:

2:da51fb522205

--- a/cmsis_dsp/TransformFunctions/arm_bitreversal.c	Thu May 30 17:10:11 2013 +0100
+++ b/cmsis_dsp/TransformFunctions/arm_bitreversal.c	Fri Nov 08 13:45:10 2013 +0000
@@ -1,8 +1,8 @@
 /* ----------------------------------------------------------------------    
-* Copyright (C) 2010 ARM Limited. All rights reserved.    
+* Copyright (C) 2010-2013 ARM Limited. All rights reserved.    
 *    
-* $Date:        15. February 2012  
-* $Revision: 	V1.1.0  
+* $Date:        17. January 2013  
+* $Revision: 	V1.4.1  
 *    
 * Project: 	    CMSIS DSP Library    
 * Title:	    arm_bitreversal.c    
@@ -11,155 +11,175 @@
 *    
 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
 *  
-* Version 1.1.0 2012/02/15 
-*    Updated with more optimizations, bug fixes and minor API changes.  
-*   
-* Version 1.0.10 2011/7/15  
-*    Initial Version  
+* 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"
 #include "arm_common_tables.h"
 
 /*    
- * @brief  In-place bit reversal function.   
- * @param[in, out] *pSrc        points to the in-place buffer of floating-point data type.   
- * @param[in]      fftSize      length of the FFT.   
- * @param[in]      bitRevFactor bit reversal modifier that supports different size FFTs with the same bit reversal table.   
- * @param[in]      *pBitRevTab  points to the bit reversal table.   
- * @return none.   
- */
+* @brief  In-place bit reversal function.   
+* @param[in, out] *pSrc        points to the in-place buffer of floating-point data type.   
+* @param[in]      fftSize      length of the FFT.   
+* @param[in]      bitRevFactor bit reversal modifier that supports different size FFTs with the same bit reversal table.   
+* @param[in]      *pBitRevTab  points to the bit reversal table.   
+* @return none.   
+*/
 
 void arm_bitreversal_f32(
-  float32_t * pSrc,
-  uint16_t fftSize,
-  uint16_t bitRevFactor,
-  uint16_t * pBitRevTab)
+float32_t * pSrc,
+uint16_t fftSize,
+uint16_t bitRevFactor,
+uint16_t * pBitRevTab)
 {
-  uint16_t fftLenBy2, fftLenBy2p1;
-  uint16_t i, j;
-  float32_t in;
+   uint16_t fftLenBy2, fftLenBy2p1;
+   uint16_t i, j;
+   float32_t in;
+
+   /*  Initializations */
+   j = 0u;
+   fftLenBy2 = fftSize >> 1u;
+   fftLenBy2p1 = (fftSize >> 1u) + 1u;
 
-  /*  Initializations */
-  j = 0u;
-  fftLenBy2 = fftSize >> 1u;
-  fftLenBy2p1 = (fftSize >> 1u) + 1u;
+   /* Bit Reversal Implementation */
+   for (i = 0u; i <= (fftLenBy2 - 2u); i += 2u)
+   {
+      if(i < j)
+      {
+         /*  pSrc[i] <-> pSrc[j]; */
+         in = pSrc[2u * i];
+         pSrc[2u * i] = pSrc[2u * j];
+         pSrc[2u * j] = in;
 
-  /* Bit Reversal Implementation */
-  for (i = 0u; i <= (fftLenBy2 - 2u); i += 2u)
-  {
-    if(i < j)
-    {
-      /*  pSrc[i] <-> pSrc[j]; */
-      in = pSrc[2u * i];
-      pSrc[2u * i] = pSrc[2u * j];
-      pSrc[2u * j] = in;
+         /*  pSrc[i+1u] <-> pSrc[j+1u] */
+         in = pSrc[(2u * i) + 1u];
+         pSrc[(2u * i) + 1u] = pSrc[(2u * j) + 1u];
+         pSrc[(2u * j) + 1u] = in;
+
+         /*  pSrc[i+fftLenBy2p1] <-> pSrc[j+fftLenBy2p1] */
+         in = pSrc[2u * (i + fftLenBy2p1)];
+         pSrc[2u * (i + fftLenBy2p1)] = pSrc[2u * (j + fftLenBy2p1)];
+         pSrc[2u * (j + fftLenBy2p1)] = in;
+
+         /*  pSrc[i+fftLenBy2p1+1u] <-> pSrc[j+fftLenBy2p1+1u] */
+         in = pSrc[(2u * (i + fftLenBy2p1)) + 1u];
+         pSrc[(2u * (i + fftLenBy2p1)) + 1u] =
+         pSrc[(2u * (j + fftLenBy2p1)) + 1u];
+         pSrc[(2u * (j + fftLenBy2p1)) + 1u] = in;
+
+      }
 
       /*  pSrc[i+1u] <-> pSrc[j+1u] */
-      in = pSrc[(2u * i) + 1u];
-      pSrc[(2u * i) + 1u] = pSrc[(2u * j) + 1u];
-      pSrc[(2u * j) + 1u] = in;
-
-      /*  pSrc[i+fftLenBy2p1] <-> pSrc[j+fftLenBy2p1] */
-      in = pSrc[2u * (i + fftLenBy2p1)];
-      pSrc[2u * (i + fftLenBy2p1)] = pSrc[2u * (j + fftLenBy2p1)];
-      pSrc[2u * (j + fftLenBy2p1)] = in;
-
-      /*  pSrc[i+fftLenBy2p1+1u] <-> pSrc[j+fftLenBy2p1+1u] */
-      in = pSrc[(2u * (i + fftLenBy2p1)) + 1u];
-      pSrc[(2u * (i + fftLenBy2p1)) + 1u] =
-        pSrc[(2u * (j + fftLenBy2p1)) + 1u];
-      pSrc[(2u * (j + fftLenBy2p1)) + 1u] = in;
-
-    }
+      in = pSrc[2u * (i + 1u)];
+      pSrc[2u * (i + 1u)] = pSrc[2u * (j + fftLenBy2)];
+      pSrc[2u * (j + fftLenBy2)] = in;
 
-    /*  pSrc[i+1u] <-> pSrc[j+1u] */
-    in = pSrc[2u * (i + 1u)];
-    pSrc[2u * (i + 1u)] = pSrc[2u * (j + fftLenBy2)];
-    pSrc[2u * (j + fftLenBy2)] = in;
+      /*  pSrc[i+2u] <-> pSrc[j+2u] */
+      in = pSrc[(2u * (i + 1u)) + 1u];
+      pSrc[(2u * (i + 1u)) + 1u] = pSrc[(2u * (j + fftLenBy2)) + 1u];
+      pSrc[(2u * (j + fftLenBy2)) + 1u] = in;
 
-    /*  pSrc[i+2u] <-> pSrc[j+2u] */
-    in = pSrc[(2u * (i + 1u)) + 1u];
-    pSrc[(2u * (i + 1u)) + 1u] = pSrc[(2u * (j + fftLenBy2)) + 1u];
-    pSrc[(2u * (j + fftLenBy2)) + 1u] = in;
+      /*  Reading the index for the bit reversal */
+      j = *pBitRevTab;
 
-    /*  Reading the index for the bit reversal */
-    j = *pBitRevTab;
-
-    /*  Updating the bit reversal index depending on the fft length  */
-    pBitRevTab += bitRevFactor;
-  }
+      /*  Updating the bit reversal index depending on the fft length  */
+      pBitRevTab += bitRevFactor;
+   }
 }
 
 
 
 /*    
- * @brief  In-place bit reversal function.   
- * @param[in, out] *pSrc        points to the in-place buffer of Q31 data type.   
- * @param[in]      fftLen       length of the FFT.   
- * @param[in]      bitRevFactor bit reversal modifier that supports different size FFTs with the same bit reversal table   
- * @param[in]      *pBitRevTab  points to bit reversal table.   
- * @return none.   
- */
+* @brief  In-place bit reversal function.   
+* @param[in, out] *pSrc        points to the in-place buffer of Q31 data type.   
+* @param[in]      fftLen       length of the FFT.   
+* @param[in]      bitRevFactor bit reversal modifier that supports different size FFTs with the same bit reversal table   
+* @param[in]      *pBitRevTab  points to bit reversal table.   
+* @return none.   
+*/
 
 void arm_bitreversal_q31(
-  q31_t * pSrc,
-  uint32_t fftLen,
-  uint16_t bitRevFactor,
-  uint16_t * pBitRevTable)
+q31_t * pSrc,
+uint32_t fftLen,
+uint16_t bitRevFactor,
+uint16_t * pBitRevTable)
 {
-  uint32_t fftLenBy2, fftLenBy2p1, i, j;
-  q31_t in;
+   uint32_t fftLenBy2, fftLenBy2p1, i, j;
+   q31_t in;
+
+   /*  Initializations      */
+   j = 0u;
+   fftLenBy2 = fftLen / 2u;
+   fftLenBy2p1 = (fftLen / 2u) + 1u;
 
-  /*  Initializations      */
-  j = 0u;
-  fftLenBy2 = fftLen / 2u;
-  fftLenBy2p1 = (fftLen / 2u) + 1u;
+   /* Bit Reversal Implementation */
+   for (i = 0u; i <= (fftLenBy2 - 2u); i += 2u)
+   {
+      if(i < j)
+      {
+         /*  pSrc[i] <-> pSrc[j]; */
+         in = pSrc[2u * i];
+         pSrc[2u * i] = pSrc[2u * j];
+         pSrc[2u * j] = in;
 
-  /* Bit Reversal Implementation */
-  for (i = 0u; i <= (fftLenBy2 - 2u); i += 2u)
-  {
-    if(i < j)
-    {
-      /*  pSrc[i] <-> pSrc[j]; */
-      in = pSrc[2u * i];
-      pSrc[2u * i] = pSrc[2u * j];
-      pSrc[2u * j] = in;
+         /*  pSrc[i+1u] <-> pSrc[j+1u] */
+         in = pSrc[(2u * i) + 1u];
+         pSrc[(2u * i) + 1u] = pSrc[(2u * j) + 1u];
+         pSrc[(2u * j) + 1u] = in;
+
+         /*  pSrc[i+fftLenBy2p1] <-> pSrc[j+fftLenBy2p1] */
+         in = pSrc[2u * (i + fftLenBy2p1)];
+         pSrc[2u * (i + fftLenBy2p1)] = pSrc[2u * (j + fftLenBy2p1)];
+         pSrc[2u * (j + fftLenBy2p1)] = in;
+
+         /*  pSrc[i+fftLenBy2p1+1u] <-> pSrc[j+fftLenBy2p1+1u] */
+         in = pSrc[(2u * (i + fftLenBy2p1)) + 1u];
+         pSrc[(2u * (i + fftLenBy2p1)) + 1u] =
+         pSrc[(2u * (j + fftLenBy2p1)) + 1u];
+         pSrc[(2u * (j + fftLenBy2p1)) + 1u] = in;
+
+      }
 
       /*  pSrc[i+1u] <-> pSrc[j+1u] */
-      in = pSrc[(2u * i) + 1u];
-      pSrc[(2u * i) + 1u] = pSrc[(2u * j) + 1u];
-      pSrc[(2u * j) + 1u] = in;
-
-      /*  pSrc[i+fftLenBy2p1] <-> pSrc[j+fftLenBy2p1] */
-      in = pSrc[2u * (i + fftLenBy2p1)];
-      pSrc[2u * (i + fftLenBy2p1)] = pSrc[2u * (j + fftLenBy2p1)];
-      pSrc[2u * (j + fftLenBy2p1)] = in;
-
-      /*  pSrc[i+fftLenBy2p1+1u] <-> pSrc[j+fftLenBy2p1+1u] */
-      in = pSrc[(2u * (i + fftLenBy2p1)) + 1u];
-      pSrc[(2u * (i + fftLenBy2p1)) + 1u] =
-        pSrc[(2u * (j + fftLenBy2p1)) + 1u];
-      pSrc[(2u * (j + fftLenBy2p1)) + 1u] = in;
-
-    }
+      in = pSrc[2u * (i + 1u)];
+      pSrc[2u * (i + 1u)] = pSrc[2u * (j + fftLenBy2)];
+      pSrc[2u * (j + fftLenBy2)] = in;
 
-    /*  pSrc[i+1u] <-> pSrc[j+1u] */
-    in = pSrc[2u * (i + 1u)];
-    pSrc[2u * (i + 1u)] = pSrc[2u * (j + fftLenBy2)];
-    pSrc[2u * (j + fftLenBy2)] = in;
+      /*  pSrc[i+2u] <-> pSrc[j+2u] */
+      in = pSrc[(2u * (i + 1u)) + 1u];
+      pSrc[(2u * (i + 1u)) + 1u] = pSrc[(2u * (j + fftLenBy2)) + 1u];
+      pSrc[(2u * (j + fftLenBy2)) + 1u] = in;
 
-    /*  pSrc[i+2u] <-> pSrc[j+2u] */
-    in = pSrc[(2u * (i + 1u)) + 1u];
-    pSrc[(2u * (i + 1u)) + 1u] = pSrc[(2u * (j + fftLenBy2)) + 1u];
-    pSrc[(2u * (j + fftLenBy2)) + 1u] = in;
+      /*  Reading the index for the bit reversal */
+      j = *pBitRevTable;
 
-    /*  Reading the index for the bit reversal */
-    j = *pBitRevTable;
-
-    /*  Updating the bit reversal index depending on the fft length */
-    pBitRevTable += bitRevFactor;
-  }
+      /*  Updating the bit reversal index depending on the fft length */
+      pBitRevTable += bitRevFactor;
+   }
 }
 
 
@@ -171,52 +191,52 @@
    * @param[in]      bitRevFactor bit reversal modifier that supports different size FFTs with the same bit reversal table   
    * @param[in]      *pBitRevTab  points to bit reversal table.   
    * @return none.   
- */
+*/
 
 void arm_bitreversal_q15(
-  q15_t * pSrc16,
-  uint32_t fftLen,
-  uint16_t bitRevFactor,
-  uint16_t * pBitRevTab)
+q15_t * pSrc16,
+uint32_t fftLen,
+uint16_t bitRevFactor,
+uint16_t * pBitRevTab)
 {
-  q31_t *pSrc = (q31_t *) pSrc16;
-  q31_t in;
-  uint32_t fftLenBy2, fftLenBy2p1;
-  uint32_t i, j;
+   q31_t *pSrc = (q31_t *) pSrc16;
+   q31_t in;
+   uint32_t fftLenBy2, fftLenBy2p1;
+   uint32_t i, j;
 
-  /*  Initializations */
-  j = 0u;
-  fftLenBy2 = fftLen / 2u;
-  fftLenBy2p1 = (fftLen / 2u) + 1u;
+   /*  Initializations */
+   j = 0u;
+   fftLenBy2 = fftLen / 2u;
+   fftLenBy2p1 = (fftLen / 2u) + 1u;
 
-  /* Bit Reversal Implementation */
-  for (i = 0u; i <= (fftLenBy2 - 2u); i += 2u)
-  {
-    if(i < j)
-    {
-      /*  pSrc[i] <-> pSrc[j]; */
-      /*  pSrc[i+1u] <-> pSrc[j+1u] */
-      in = pSrc[i];
-      pSrc[i] = pSrc[j];
-      pSrc[j] = in;
+   /* Bit Reversal Implementation */
+   for (i = 0u; i <= (fftLenBy2 - 2u); i += 2u)
+   {
+      if(i < j)
+      {
+         /*  pSrc[i] <-> pSrc[j]; */
+         /*  pSrc[i+1u] <-> pSrc[j+1u] */
+         in = pSrc[i];
+         pSrc[i] = pSrc[j];
+         pSrc[j] = in;
 
-      /*  pSrc[i + fftLenBy2p1] <-> pSrc[j + fftLenBy2p1];  */
-      /*  pSrc[i + fftLenBy2p1+1u] <-> pSrc[j + fftLenBy2p1+1u] */
-      in = pSrc[i + fftLenBy2p1];
-      pSrc[i + fftLenBy2p1] = pSrc[j + fftLenBy2p1];
-      pSrc[j + fftLenBy2p1] = in;
-    }
+         /*  pSrc[i + fftLenBy2p1] <-> pSrc[j + fftLenBy2p1];  */
+         /*  pSrc[i + fftLenBy2p1+1u] <-> pSrc[j + fftLenBy2p1+1u] */
+         in = pSrc[i + fftLenBy2p1];
+         pSrc[i + fftLenBy2p1] = pSrc[j + fftLenBy2p1];
+         pSrc[j + fftLenBy2p1] = in;
+      }
 
-    /*  pSrc[i+1u] <-> pSrc[j+fftLenBy2];         */
-    /*  pSrc[i+2] <-> pSrc[j+fftLenBy2+1u]  */
-    in = pSrc[i + 1u];
-    pSrc[i + 1u] = pSrc[j + fftLenBy2];
-    pSrc[j + fftLenBy2] = in;
+      /*  pSrc[i+1u] <-> pSrc[j+fftLenBy2];         */
+      /*  pSrc[i+2] <-> pSrc[j+fftLenBy2+1u]  */
+      in = pSrc[i + 1u];
+      pSrc[i + 1u] = pSrc[j + fftLenBy2];
+      pSrc[j + fftLenBy2] = in;
 
-    /*  Reading the index for the bit reversal */
-    j = *pBitRevTab;
+      /*  Reading the index for the bit reversal */
+      j = *pBitRevTab;
 
-    /*  Updating the bit reversal index depending on the fft length  */
-    pBitRevTab += bitRevFactor;
-  }
+      /*  Updating the bit reversal index depending on the fft length  */
+      pBitRevTab += bitRevFactor;
+   }
 }