CMSIS DSP Software Library: arm_max_f32.c Source File

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# arm_max_f32.c

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    00001 /* ----------------------------------------------------------------------
    00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
    00003 *
    00004 * $Date:        15. July 2011
    00005 * $Revision:    V1.0.10
    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/Cortex-M0
    00013 *
    00014 * Version 1.0.10 2011/7/15
    00015 *    Big Endian support added and Merged M0 and M3/M4 Source code.
    00016 *
    00017 * Version 1.0.3 2010/11/29
    00018 *    Re-organized the CMSIS folders and updated documentation.
    00019 *
    00020 * Version 1.0.2 2010/11/11
    00021 *    Documentation updated.
    00022 *
    00023 * Version 1.0.1 2010/10/05
    00024 *    Production release and review comments incorporated.
    00025 *
    00026 * Version 1.0.0 2010/09/20
    00027 *    Production release and review comments incorporated.
    00028 * ---------------------------------------------------------------------------- */
    00029
    00030 #include "arm_math.h"
    00031
    00059 void arm_max_f32(
    00060   float32_t * pSrc,
    00061   uint32_t blockSize,
    00062   float32_t * pResult,
    00063   uint32_t * pIndex)
    00064 {
    00065   float32_t maxVal, out;                         /* Temporary variables to store the output value. */
    00066   uint32_t blkCnt, outIndex;                     /* loop counter */
    00067
    00068   /* Initialise the index value to zero. */
    00069   outIndex = 0u;
    00070   /* Load first input value that act as reference value for comparision */
    00071   out = *pSrc++;
    00072
    00073   /* Loop over blockSize number of values */
    00074   blkCnt = (blockSize - 1u);
    00075
    00076 #ifndef ARM_MATH_CM0
    00077
    00078   /* Run the below code for Cortex-M4 and Cortex-M3 */
    00079
    00080   do
    00081   {
    00082     /* Initialize maxVal to the next consecutive values one by one */
    00083     maxVal = *pSrc++;
    00084
    00085     /* compare for the maximum value */
    00086     if(out < maxVal)
    00087     {
    00088       /* Update the maximum value and it's index */
    00089       out = maxVal;
    00090       outIndex = blockSize - blkCnt;
    00091     }
    00092     /* Decrement the loop counter */
    00093     blkCnt--;
    00094
    00095   } while(blkCnt > 0u);
    00096
    00097 #else
    00098
    00099   /* Run the below code for Cortex-M0 */
    00100   while(blkCnt > 0u)
    00101   {
    00102     /* Initialize maxVal to the next consecutive values one by one */
    00103     maxVal = *pSrc++;
    00104
    00105     /* compare for the maximum value */
    00106     if(out < maxVal)
    00107     {
    00108       /* Update the maximum value and it's index */
    00109       out = maxVal;
    00110       outIndex = blockSize - blkCnt;
    00111     }
    00112     /* Decrement the loop counter */
    00113     blkCnt--;
    00114
    00115   }
    00116
    00117 #endif /* #ifndef ARM_MATH_CM0 */
    00118
    00119
    00120   /* Store the maximum value and it's index into destination pointers */
    00121   *pResult = out;
    00122   *pIndex = outIndex;
    00123 }
    00124

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