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# arm_max_q15.c

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    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_q15.c
    00009 *
    00010 * Description:  Maximum value of a Q15 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
    00048 void arm_max_q15(
    00049   q15_t * pSrc,
    00050   uint32_t blockSize,
    00051   q15_t * pResult,
    00052   uint32_t * pIndex)
    00053 {
    00054   q15_t maxVal, out;                             /* Temporary variables to store the output value. */
    00055   uint32_t blkCnt, outIndex;                     /* loop counter */
    00056
    00057   /* Initialise the index value to zero. */
    00058   outIndex = 0u;
    00059   /* Load first input value that act as reference value for comparision */
    00060   out = *pSrc++;
    00061
    00062   /* Loop over blockSize number of values */
    00063   blkCnt = (blockSize - 1u);
    00064
    00065   do
    00066   {
    00067     /* Initialize maxVal to the next consecutive values one by one */
    00068     maxVal = *pSrc++;
    00069
    00070     /* compare for the maximum value */
    00071     if(out < maxVal)
    00072     {
    00073       /* Update the maximum value and its index */
    00074       out = maxVal;
    00075       outIndex = blockSize - blkCnt;
    00076     }
    00077
    00078     blkCnt--;
    00079
    00080   } while(blkCnt > 0u);
    00081
    00082   /* Store the maximum value and its index into destination pointers */
    00083   *pResult = out;
    00084   *pIndex = outIndex;
    00085 }
    00086

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