arm_max_q15.c
119 lines
| 2.9 KiB
| text/x-c
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CLexer
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r41 | /* ---------------------------------------------------------------------- | ||
* Copyright (C) 2010 ARM Limited. All rights reserved. | ||||
* | ||||
* $Date: 15. July 2011 | ||||
* $Revision: V1.0.10 | ||||
* | ||||
* Project: CMSIS DSP Library | ||||
* Title: arm_max_q15.c | ||||
* | ||||
* Description: Maximum value of a Q15 vector. | ||||
* | ||||
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0 | ||||
* | ||||
* Version 1.0.10 2011/7/15 | ||||
* Big Endian support added and Merged M0 and M3/M4 Source code. | ||||
* | ||||
* Version 1.0.3 2010/11/29 | ||||
* Re-organized the CMSIS folders and updated documentation. | ||||
* | ||||
* Version 1.0.2 2010/11/11 | ||||
* Documentation updated. | ||||
* | ||||
* Version 1.0.1 2010/10/05 | ||||
* Production release and review comments incorporated. | ||||
* | ||||
* Version 1.0.0 2010/09/20 | ||||
* Production release and review comments incorporated. | ||||
* ---------------------------------------------------------------------------- */ | ||||
#include "arm_math.h" | ||||
/** | ||||
* @ingroup groupStats | ||||
*/ | ||||
/** | ||||
* @addtogroup Max | ||||
* @{ | ||||
*/ | ||||
/** | ||||
* @brief Maximum value of a Q15 vector. | ||||
* @param[in] *pSrc points to the input vector | ||||
* @param[in] blockSize length of the input vector | ||||
* @param[out] *pResult maximum value returned here | ||||
* @param[out] *pIndex index of maximum value returned here | ||||
* @return none. | ||||
*/ | ||||
void arm_max_q15( | ||||
q15_t * pSrc, | ||||
uint32_t blockSize, | ||||
q15_t * pResult, | ||||
uint32_t * pIndex) | ||||
{ | ||||
q15_t maxVal, out; /* Temporary variables to store the output value. */ | ||||
uint32_t blkCnt, outIndex; /* loop counter */ | ||||
/* Initialise the index value to zero. */ | ||||
outIndex = 0u; | ||||
/* Load first input value that act as reference value for comparision */ | ||||
out = *pSrc++; | ||||
/* Loop over blockSize number of values */ | ||||
blkCnt = (blockSize - 1u); | ||||
#ifndef ARM_MATH_CM0 | ||||
/* Run the below code for Cortex-M4 and Cortex-M3 */ | ||||
do | ||||
{ | ||||
/* Initialize maxVal to the next consecutive values one by one */ | ||||
maxVal = *pSrc++; | ||||
/* compare for the maximum value */ | ||||
if(out < maxVal) | ||||
{ | ||||
/* Update the maximum value and its index */ | ||||
out = maxVal; | ||||
outIndex = blockSize - blkCnt; | ||||
} | ||||
blkCnt--; | ||||
} while(blkCnt > 0u); | ||||
#else | ||||
/* Run the below code for Cortex-M0 */ | ||||
while(blkCnt > 0u) | ||||
{ | ||||
/* Initialize maxVal to the next consecutive values one by one */ | ||||
maxVal = *pSrc++; | ||||
/* compare for the maximum value */ | ||||
if(out < maxVal) | ||||
{ | ||||
/* Update the maximum value and its index */ | ||||
out = maxVal; | ||||
outIndex = blockSize - blkCnt; | ||||
} | ||||
/* Decrement the loop counter */ | ||||
blkCnt--; | ||||
} | ||||
#endif /* #ifndef ARM_MATH_CM0 */ | ||||
/* Store the maximum value and its index into destination pointers */ | ||||
*pResult = out; | ||||
*pIndex = outIndex; | ||||
} | ||||
/** | ||||
* @} end of Max group | ||||
*/ | ||||