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/* ----------------------------------------------------------------------
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* Copyright (C) 2010 ARM Limited. All rights reserved.
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*
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* $Date: 29. November 2010
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* $Revision: V1.0.3
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*
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* Project: CMSIS DSP Library
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* Title: arm_max_f32.c
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*
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* Description: Maximum value of a floating-point vector.
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*
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* Target Processor: Cortex-M4/Cortex-M3
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*
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* Version 1.0.3 2010/11/29
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* Re-organized the CMSIS folders and updated documentation.
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*
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* Version 1.0.2 2010/11/11
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* Documentation updated.
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*
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* Version 1.0.1 2010/10/05
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* Production release and review comments incorporated.
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*
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* Version 1.0.0 2010/09/20
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* Production release and review comments incorporated.
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* ---------------------------------------------------------------------------- */
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#include "arm_math.h"
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/**
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* @ingroup groupStats
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*/
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/**
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* @defgroup Max Maximum
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*
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* Computes the maximum value of an array of data.
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* The function returns both the maximum value and its position within the array.
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* There are separate functions for floating-point, Q31, Q15, and Q7 data types.
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*/
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/**
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* @addtogroup Max
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* @{
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*/
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/**
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* @brief Maximum value of a floating-point vector.
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* @param[in] *pSrc points to the input vector
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* @param[in] blockSize length of the input vector
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* @param[out] *pResult maximum value returned here
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* @param[out] *pIndex index of maximum value returned here
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* @return none.
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*/
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void arm_max_f32(
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float32_t * pSrc,
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uint32_t blockSize,
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float32_t * pResult,
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uint32_t * pIndex)
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{
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float32_t maxVal, out; /* Temporary variables to store the output value. */
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uint32_t blkCnt, outIndex; /* loop counter */
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/* Initialise the index value to zero. */
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outIndex = 0u;
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/* Load first input value that act as reference value for comparision */
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out = *pSrc++;
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/* Loop over blockSize number of values */
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blkCnt = (blockSize - 1u);
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do
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{
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/* Initialize maxVal to the next consecutive values one by one */
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maxVal = *pSrc++;
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/* compare for the maximum value */
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if(out < maxVal)
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{
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/* Update the maximum value and it's index */
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out = maxVal;
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outIndex = blockSize - blkCnt;
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}
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blkCnt--;
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} while(blkCnt > 0u);
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/* Store the maximum value and it's index into destination pointers */
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*pResult = out;
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*pIndex = outIndex;
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}
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/**
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* @} end of Max group
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*/
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