arm_max_q31.c
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| 2.9 KiB
| text/x-c
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CLexer
jeandet@pc-de-jeandet3.LAB-LPP.LOCAL
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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_q31.c | ||||
| * | ||||
| * Description: Maximum value of a Q31 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 Q31 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_q31( | ||||
| q31_t * pSrc, | ||||
| uint32_t blockSize, | ||||
| q31_t * pResult, | ||||
| uint32_t * pIndex) | ||||
| { | ||||
| q31_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; | ||||
| } | ||||
| /* Decrement the loop counter */ | ||||
| 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 | ||||
| */ | ||||