dsp - CMSIS DSP Library from CMSIS 2.0. See http://www.…

Users » simon » Code » dsp

CMSIS DSP Library from CMSIS 2.0. See http://www.onarm.com/cmsis/ for full details

Dependents: K22F_DSP_Matrix_least_square BNO055-ELEC3810 1BNO055 ECE4180Project--Slave2 ... more

src/Cortex-M4-M3/ComplexMathFunctions/arm_cmplx_conj_q31.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_conj_q31.c
simon	0:1014af42efd9	9	*
simon	0:1014af42efd9	10	* Description: Q31 complex conjugate.
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_conj
simon	0:1014af42efd9	35	* @{
simon	0:1014af42efd9	36	*/
simon	0:1014af42efd9	37
simon	0:1014af42efd9	38	/**
simon	0:1014af42efd9	39	* @brief Q31 complex conjugate.
simon	0:1014af42efd9	40	* @param *pSrc points to the input vector
simon	0:1014af42efd9	41	* @param *pDst points to the output vector
simon	0:1014af42efd9	42	* @param numSamples number of complex samples in each vector
simon	0:1014af42efd9	43	* @return none.
simon	0:1014af42efd9	44	*
simon	0:1014af42efd9	45	* <b>Scaling and Overflow Behavior:</b>
simon	0:1014af42efd9	46	* \par
simon	0:1014af42efd9	47	* The function uses saturating arithmetic.
simon	0:1014af42efd9	48	* The Q31 value -1 (0x80000000) will be saturated to the maximum allowable positive value 0x7FFFFFFF.
simon	0:1014af42efd9	49	*/
simon	0:1014af42efd9	50
simon	0:1014af42efd9	51	void arm_cmplx_conj_q31(
simon	0:1014af42efd9	52	q31_t * pSrc,
simon	0:1014af42efd9	53	q31_t * pDst,
simon	0:1014af42efd9	54	uint32_t numSamples)
simon	0:1014af42efd9	55	{
simon	0:1014af42efd9	56	uint32_t blkCnt; /* loop counter */
simon	0:1014af42efd9	57	q31_t in; /* Input value */
simon	0:1014af42efd9	58
simon	0:1014af42efd9	59	/loop Unrolling /
simon	0:1014af42efd9	60	blkCnt = numSamples >> 2u;
simon	0:1014af42efd9	61
simon	0:1014af42efd9	62	/* First part of the processing with loop unrolling. Compute 4 outputs at a time.
simon	0:1014af42efd9	63	** a second loop below computes the remaining 1 to 3 samples. */
simon	0:1014af42efd9	64	while(blkCnt > 0u)
simon	0:1014af42efd9	65	{
simon	0:1014af42efd9	66	/* C[0]+jC[1] = A[0]+ j (-1) A[1] */
simon	0:1014af42efd9	67	/* Calculate Complex Conjugate and then store the results in the destination buffer. */
simon	0:1014af42efd9	68	/* Saturated to 0x7fffffff if the input is -1(0x80000000)*/
simon	0:1014af42efd9	69	pDst++ = pSrc++;
simon	0:1014af42efd9	70	in = *pSrc++;
simon	0:1014af42efd9	71	*pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
simon	0:1014af42efd9	72	pDst++ = pSrc++;
simon	0:1014af42efd9	73	in = *pSrc++;
simon	0:1014af42efd9	74	*pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
simon	0:1014af42efd9	75	pDst++ = pSrc++;
simon	0:1014af42efd9	76	in = *pSrc++;
simon	0:1014af42efd9	77	*pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
simon	0:1014af42efd9	78	pDst++ = pSrc++;
simon	0:1014af42efd9	79	in = *pSrc++;
simon	0:1014af42efd9	80	*pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
simon	0:1014af42efd9	81
simon	0:1014af42efd9	82	/* Decrement the loop counter */
simon	0:1014af42efd9	83	blkCnt--;
simon	0:1014af42efd9	84	}
simon	0:1014af42efd9	85
simon	0:1014af42efd9	86	/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
simon	0:1014af42efd9	87	** No loop unrolling is used. */
simon	0:1014af42efd9	88	blkCnt = numSamples % 0x4u;
simon	0:1014af42efd9	89
simon	0:1014af42efd9	90	while(blkCnt > 0u)
simon	0:1014af42efd9	91	{
simon	0:1014af42efd9	92	/* C[0]+jC[1] = A[0]+ j (-1) A[1] */
simon	0:1014af42efd9	93	/* Calculate Complex Conjugate and then store the results in the destination buffer. */
simon	0:1014af42efd9	94	/* Saturated to 0x7fffffff if the input is -1(0x80000000)*/
simon	0:1014af42efd9	95	pDst++ = pSrc++;
simon	0:1014af42efd9	96	in = *pSrc++;
simon	0:1014af42efd9	97	*pDst++ = (in == 0x80000000) ? 0x7fffffff : -in;
simon	0:1014af42efd9	98
simon	0:1014af42efd9	99	/* Decrement the loop counter */
simon	0:1014af42efd9	100	blkCnt--;
simon	0:1014af42efd9	101	}
simon	0:1014af42efd9	102	}
simon	0:1014af42efd9	103
simon	0:1014af42efd9	104	/**
simon	0:1014af42efd9	105	* @} end of cmplx_conj group
simon	0:1014af42efd9	106	*/

Repository toolbox

Export to desktop IDE

Repository details

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_conj_q31.c@0:1014af42efd9, 2011-03-10 (annotated)

Who changed what in which revision?

Repository toolbox

Repository details

Important Information for this Arm website

Access Warning