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_max_f32.c 00009 * 00010 * Description: Maximum value of a floating-point vector. 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 00056 void arm_max_f32( 00057 float32_t * pSrc, 00058 uint32_t blockSize, 00059 float32_t * pResult, 00060 uint32_t * pIndex) 00061 { 00062 float32_t maxVal, out; /* Temporary variables to store the output value. */ 00063 uint32_t blkCnt, outIndex; /* loop counter */ 00064 00065 /* Initialise the index value to zero. */ 00066 outIndex = 0u; 00067 /* Load first input value that act as reference value for comparision */ 00068 out = *pSrc++; 00069 00070 /* Loop over blockSize number of values */ 00071 blkCnt = (blockSize - 1u); 00072 00073 do 00074 { 00075 /* Initialize maxVal to the next consecutive values one by one */ 00076 maxVal = *pSrc++; 00077 00078 /* compare for the maximum value */ 00079 if(out < maxVal) 00080 { 00081 /* Update the maximum value and it's index */ 00082 out = maxVal; 00083 outIndex = blockSize - blkCnt; 00084 } 00085 00086 blkCnt--; 00087 00088 } while(blkCnt > 0u); 00089 00090 /* Store the maximum value and it's index into destination pointers */ 00091 *pResult = out; 00092 *pIndex = outIndex; 00093 } 00094