CMSIS DSP Software Library: arm_mean_f32.c Source File 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: 29. November 2010 00005 * $Revision: V1.0.3 00006 * 00007 * Project: CMSIS DSP Library 00008 * Title: arm_mean_f32.c 00009 * 00010 * Description: Mean value of two floating point arrays. 00011 * 00012 * Target Processor: Cortex-M4/Cortex-M3 00013 * 00014 * Version 1.0.3 2010/11/29 00015 * Re-organized the CMSIS folders and updated documentation. 00016 * 00017 * Version 1.0.2 2010/11/11 00018 * Documentation updated. 00019 * 00020 * Version 1.0.1 2010/10/05 00021 * Production release and review comments incorporated. 00022 * 00023 * Version 1.0.0 2010/09/20 00024 * Production release and review comments incorporated. 00025 * ---------------------------------------------------------------------------- */ 00026 00027 #include "arm_math.h" 00028 00061 void arm_mean_f32( 00062 float32_t * pSrc, 00063 uint32_t blockSize, 00064 float32_t * pResult) 00065 { 00066 float32_t sum = 0.0f; /* Temporary result storage */ 00067 uint32_t blkCnt; /* loop counter */ 00068 00069 /*loop Unrolling */ 00070 blkCnt = blockSize >> 2u; 00071 00072 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00073 ** a second loop below computes the remaining 1 to 3 samples. */ 00074 while(blkCnt > 0u) 00075 { 00076 /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */ 00077 sum += *pSrc++; 00078 sum += *pSrc++; 00079 sum += *pSrc++; 00080 sum += *pSrc++; 00081 00082 /* Decrement the loop counter */ 00083 blkCnt--; 00084 } 00085 00086 /* If the blockSize is not a multiple of 4, compute any remaining output samples here. 00087 ** No loop unrolling is used. */ 00088 blkCnt = blockSize % 0x4u; 00089 00090 while(blkCnt > 0u) 00091 { 00092 /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) */ 00093 sum += *pSrc++; 00094 00095 /* Decrement the loop counter */ 00096 blkCnt--; 00097 } 00098 00099 /* C = (A[0] + A[1] + A[2] + ... + A[blockSize-1]) / blockSize */ 00100 /* Store the result to the destination */ 00101 *pResult = sum / (float32_t) blockSize; 00102 } 00103  All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Defines Generated on Mon Nov 29 2010 17:19:57 for CMSIS DSP Software Library by  1.7.2

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