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src/Cortex-M4-M3/ComplexMathFunctions/arm_cmplx_mag_q15.c@0:1014af42efd9, 2011-03-10 (annotated)

Committer:: simon
Date:: Thu Mar 10 15:07:50 2011 +0000
Revision:: 0:1014af42efd9

Who changed what in which revision?

User	Revision	Line number	New contents of line
simon	0:1014af42efd9	1	/* ----------------------------------------------------------------------
simon	0:1014af42efd9	2	* Copyright (C) 2010 ARM Limited. All rights reserved.
simon	0:1014af42efd9	3	*
simon	0:1014af42efd9	4	* $Date: 29. November 2010
simon	0:1014af42efd9	5	* $Revision: V1.0.3
simon	0:1014af42efd9	6	*
simon	0:1014af42efd9	7	* Project: CMSIS DSP Library
simon	0:1014af42efd9	8	* Title: arm_cmplx_mag_q15.c
simon	0:1014af42efd9	9	*
simon	0:1014af42efd9	10	* Description: Q15 complex magnitude.
simon	0:1014af42efd9	11	*
simon	0:1014af42efd9	12	* Target Processor: Cortex-M4/Cortex-M3
simon	0:1014af42efd9	13	*
simon	0:1014af42efd9	14	* Version 1.0.3 2010/11/29
simon	0:1014af42efd9	15	* Re-organized the CMSIS folders and updated documentation.
simon	0:1014af42efd9	16	*
simon	0:1014af42efd9	17	* Version 1.0.2 2010/11/11
simon	0:1014af42efd9	18	* Documentation updated.
simon	0:1014af42efd9	19	*
simon	0:1014af42efd9	20	* Version 1.0.1 2010/10/05
simon	0:1014af42efd9	21	* Production release and review comments incorporated.
simon	0:1014af42efd9	22	*
simon	0:1014af42efd9	23	* Version 1.0.0 2010/09/20
simon	0:1014af42efd9	24	* Production release and review comments incorporated.
simon	0:1014af42efd9	25	* ---------------------------------------------------------------------------- */
simon	0:1014af42efd9	26
simon	0:1014af42efd9	27	#include "arm_math.h"
simon	0:1014af42efd9	28
simon	0:1014af42efd9	29	/**
simon	0:1014af42efd9	30	* @ingroup groupCmplxMath
simon	0:1014af42efd9	31	*/
simon	0:1014af42efd9	32
simon	0:1014af42efd9	33	/**
simon	0:1014af42efd9	34	* @addtogroup cmplx_mag
simon	0:1014af42efd9	35	* @{
simon	0:1014af42efd9	36	*/
simon	0:1014af42efd9	37
simon	0:1014af42efd9	38
simon	0:1014af42efd9	39	/**
simon	0:1014af42efd9	40	* @brief Q15 complex magnitude
simon	0:1014af42efd9	41	* @param *pSrc points to the complex input vector
simon	0:1014af42efd9	42	* @param *pDst points to the real output vector
simon	0:1014af42efd9	43	* @param numSamples number of complex samples in the input vector
simon	0:1014af42efd9	44	* @return none.
simon	0:1014af42efd9	45	*
simon	0:1014af42efd9	46	* <b>Scaling and Overflow Behavior:</b>
simon	0:1014af42efd9	47	* \par
simon	0:1014af42efd9	48	* The function implements 1.15 by 1.15 multiplications and finally output is converted into 2.14 format.
simon	0:1014af42efd9	49	*/
simon	0:1014af42efd9	50
simon	0:1014af42efd9	51	void arm_cmplx_mag_q15(
simon	0:1014af42efd9	52	q15_t * pSrc,
simon	0:1014af42efd9	53	q15_t * pDst,
simon	0:1014af42efd9	54	uint32_t numSamples)
simon	0:1014af42efd9	55	{
simon	0:1014af42efd9	56	q15_t real, imag; /* Temporary variables to hold input values */
simon	0:1014af42efd9	57	q31_t acc0, acc1; /* Accumulators */
simon	0:1014af42efd9	58	uint32_t blkCnt; /* loop counter */
simon	0:1014af42efd9	59
simon	0:1014af42efd9	60
simon	0:1014af42efd9	61	/loop Unrolling /
simon	0:1014af42efd9	62	blkCnt = numSamples >> 2u;
simon	0:1014af42efd9	63
simon	0:1014af42efd9	64	/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
simon	0:1014af42efd9	65	** a second loop below computes the remaining 1 to 3 samples. */
simon	0:1014af42efd9	66	while(blkCnt > 0u)
simon	0:1014af42efd9	67	{
simon	0:1014af42efd9	68
simon	0:1014af42efd9	69	/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
simon	0:1014af42efd9	70	real = *pSrc++;
simon	0:1014af42efd9	71	imag = *pSrc++;
simon	0:1014af42efd9	72	acc0 = __SMUAD(real, real);
simon	0:1014af42efd9	73	acc1 = __SMUAD(imag, imag);
simon	0:1014af42efd9	74	/* store the result in 2.14 format in the destination buffer. */
simon	0:1014af42efd9	75	arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
simon	0:1014af42efd9	76
simon	0:1014af42efd9	77	real = *pSrc++;
simon	0:1014af42efd9	78	imag = *pSrc++;
simon	0:1014af42efd9	79	acc0 = __SMUAD(real, real);
simon	0:1014af42efd9	80	acc1 = __SMUAD(imag, imag);
simon	0:1014af42efd9	81	/* store the result in 2.14 format in the destination buffer. */
simon	0:1014af42efd9	82	arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
simon	0:1014af42efd9	83
simon	0:1014af42efd9	84	real = *pSrc++;
simon	0:1014af42efd9	85	imag = *pSrc++;
simon	0:1014af42efd9	86	acc0 = __SMUAD(real, real);
simon	0:1014af42efd9	87	acc1 = __SMUAD(imag, imag);
simon	0:1014af42efd9	88	/* store the result in 2.14 format in the destination buffer. */
simon	0:1014af42efd9	89	arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
simon	0:1014af42efd9	90
simon	0:1014af42efd9	91	real = *pSrc++;
simon	0:1014af42efd9	92	imag = *pSrc++;
simon	0:1014af42efd9	93	acc0 = __SMUAD(real, real);
simon	0:1014af42efd9	94	acc1 = __SMUAD(imag, imag);
simon	0:1014af42efd9	95	/* store the result in 2.14 format in the destination buffer. */
simon	0:1014af42efd9	96	arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
simon	0:1014af42efd9	97
simon	0:1014af42efd9	98	/* Decrement the loop counter */
simon	0:1014af42efd9	99	blkCnt--;
simon	0:1014af42efd9	100	}
simon	0:1014af42efd9	101
simon	0:1014af42efd9	102	/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
simon	0:1014af42efd9	103	** No loop unrolling is used. */
simon	0:1014af42efd9	104	blkCnt = numSamples % 0x4u;
simon	0:1014af42efd9	105
simon	0:1014af42efd9	106	while(blkCnt > 0u)
simon	0:1014af42efd9	107	{
simon	0:1014af42efd9	108	/* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
simon	0:1014af42efd9	109	real = *pSrc++;
simon	0:1014af42efd9	110	imag = *pSrc++;
simon	0:1014af42efd9	111	acc0 = __SMUAD(real, real);
simon	0:1014af42efd9	112	acc1 = __SMUAD(imag, imag);
simon	0:1014af42efd9	113	/* store the result in 2.14 format in the destination buffer. */
simon	0:1014af42efd9	114	arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
simon	0:1014af42efd9	115
simon	0:1014af42efd9	116	/* Decrement the loop counter */
simon	0:1014af42efd9	117	blkCnt--;
simon	0:1014af42efd9	118	}
simon	0:1014af42efd9	119	}
simon	0:1014af42efd9	120
simon	0:1014af42efd9	121	/**
simon	0:1014af42efd9	122	* @} end of cmplx_mag group
simon	0:1014af42efd9	123	*/

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Type:	Library
Created:	10 Mar 2011
Imports:	907
Forks:	1
Commits:	3
Dependents:	5
Dependencies:	0
Followers:	35

src/Cortex-M4-M3/ComplexMathFunctions/arm_cmplx_mag_q15.c@0:1014af42efd9, 2011-03-10 (annotated)

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