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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: 15. July 2011
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* $Revision: V1.0.10
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*
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* Project: CMSIS DSP Library
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* Title: arm_max_q15.c
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*
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* Description: Maximum value of a Q15 vector.
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*
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* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
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*
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* Version 1.0.10 2011/7/15
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* Big Endian support added and Merged M0 and M3/M4 Source code.
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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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* @addtogroup Max
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* @{
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*/
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/**
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* @brief Maximum value of a Q15 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_q15(
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q15_t * pSrc,
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uint32_t blockSize,
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q15_t * pResult,
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uint32_t * pIndex)
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{
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q15_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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#ifndef ARM_MATH_CM0
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/* Run the below code for Cortex-M4 and Cortex-M3 */
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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 its 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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#else
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/* Run the below code for Cortex-M0 */
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while(blkCnt > 0u)
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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 its index */
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out = maxVal;
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outIndex = blockSize - blkCnt;
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}
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/* Decrement the loop counter */
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blkCnt--;
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}
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#endif /* #ifndef ARM_MATH_CM0 */
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/* Store the maximum value and its 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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