- Main Page
- Modules
- Data Structures
- Files
- Examples

- File List
- Globals

# arm_mean_f32.c

Go to the documentation of this file.

    00001 /* ----------------------------------------------------------------------
    00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
    00003 *
    00004 * $Date:        15. July 2011
    00005 * $Revision:    V1.0.10
    00006 *
    00007 * Project:      CMSIS DSP Library
    00008 * Title:        arm_mean_f32.c
    00009 *
    00010 * Description:  Mean value of a floating-point vector.
    00011 *
    00012 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
    00013 *
    00014 * Version 1.0.10 2011/7/15
    00015 *    Big Endian support added and Merged M0 and M3/M4 Source code.
    00016 *
    00017 * Version 1.0.3 2010/11/29
    00018 *    Re-organized the CMSIS folders and updated documentation.
    00019 *
    00020 * Version 1.0.2 2010/11/11
    00021 *    Documentation updated.
    00022 *
    00023 * Version 1.0.1 2010/10/05
    00024 *    Production release and review comments incorporated.
    00025 *
    00026 * Version 1.0.0 2010/09/20
    00027 *    Production release and review comments incorporated.
    00028 * ---------------------------------------------------------------------------- */
    00029
    00030 #include "arm_math.h"
    00031
    00064 void arm_mean_f32(
    00065   float32_t * pSrc,
    00066   uint32_t blockSize,
    00067   float32_t * pResult)
    00068 {
    00069   float32_t sum = 0.0f;                          /* Temporary result storage */
    00070   uint32_t blkCnt;                               /* loop counter */
    00071
    00072 #ifndef ARM_MATH_CM0
    00073
    00074   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00075
    00076   /*loop Unrolling */
    00077   blkCnt = blockSize >> 2u;
    00078
    00079   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
    00080    ** a second loop below computes the remaining 1 to 3 samples. */
    00081   while(blkCnt > 0u)
    00082   {
    00083     /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
    00084     sum += *pSrc++;
    00085     sum += *pSrc++;
    00086     sum += *pSrc++;
    00087     sum += *pSrc++;
    00088
    00089     /* Decrement the loop counter */
    00090     blkCnt--;
    00091   }
    00092
    00093   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
    00094    ** No loop unrolling is used. */
    00095   blkCnt = blockSize % 0x4u;
    00096
    00097 #else
    00098
    00099   /* Run the below code for Cortex-M0 */
    00100
    00101   /* Loop over blockSize number of values */
    00102   blkCnt = blockSize;
    00103
    00104 #endif /* #ifndef ARM_MATH_CM0 */
    00105
    00106   while(blkCnt > 0u)
    00107   {
    00108     /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */
    00109     sum += *pSrc++;
    00110
    00111     /* Decrement the loop counter */
    00112     blkCnt--;
    00113   }
    00114
    00115   /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize  */
    00116   /* Store the result to the destination */
    00117   *pResult = sum / (float32_t) blockSize;
    00118 }
    00119

All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines