CMSIS DSP Software Library: arm_cmplx_mag_q15.c Source File
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arm_cmplx_mag_q15.c
Go to the documentation of this file.00001 /* ----------------------------------------------------------------------
00002 * Copyright (C) 2010 ARM Limited. All rights reserved.
00003 *
00004 * $Date: 29. November 2010
00005 * $Revision: V1.0.3
00006 *
00007 * Project: CMSIS DSP Library
00008 * Title: arm_cmplx_mag_q15.c
00009 *
00010 * Description: Q15 complex magnitude.
00011 *
00012 * Target Processor: Cortex-M4/Cortex-M3
00013 *
00014 * Version 1.0.3 2010/11/29
00015 * Re-organized the CMSIS folders and updated documentation.
00016 *
00017 * Version 1.0.2 2010/11/11
00018 * Documentation updated.
00019 *
00020 * Version 1.0.1 2010/10/05
00021 * Production release and review comments incorporated.
00022 *
00023 * Version 1.0.0 2010/09/20
00024 * Production release and review comments incorporated.
00025 * ---------------------------------------------------------------------------- */
00026
00027 #include "arm_math.h"
00028
00051 void arm_cmplx_mag_q15(
00052 q15_t * pSrc,
00053 q15_t * pDst,
00054 uint32_t numSamples)
00055 {
00056 q15_t real, imag; /* Temporary variables to hold input values */
00057 q31_t acc0, acc1; /* Accumulators */
00058 uint32_t blkCnt; /* loop counter */
00059
00060
00061 /*loop Unrolling */
00062 blkCnt = numSamples >> 2u;
00063
00064 /* First part of the processing with loop unrolling. Compute 4 outputs at a time.
00065 ** a second loop below computes the remaining 1 to 3 samples. */
00066 while(blkCnt > 0u)
00067 {
00068
00069 /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
00070 real = *pSrc++;
00071 imag = *pSrc++;
00072 acc0 = __SMUAD(real, real);
00073 acc1 = __SMUAD(imag, imag);
00074 /* store the result in 2.14 format in the destination buffer. */
00075 arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
00076
00077 real = *pSrc++;
00078 imag = *pSrc++;
00079 acc0 = __SMUAD(real, real);
00080 acc1 = __SMUAD(imag, imag);
00081 /* store the result in 2.14 format in the destination buffer. */
00082 arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
00083
00084 real = *pSrc++;
00085 imag = *pSrc++;
00086 acc0 = __SMUAD(real, real);
00087 acc1 = __SMUAD(imag, imag);
00088 /* store the result in 2.14 format in the destination buffer. */
00089 arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
00090
00091 real = *pSrc++;
00092 imag = *pSrc++;
00093 acc0 = __SMUAD(real, real);
00094 acc1 = __SMUAD(imag, imag);
00095 /* store the result in 2.14 format in the destination buffer. */
00096 arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
00097
00098 /* Decrement the loop counter */
00099 blkCnt--;
00100 }
00101
00102 /* If the numSamples is not a multiple of 4, compute any remaining output samples here.
00103 ** No loop unrolling is used. */
00104 blkCnt = numSamples % 0x4u;
00105
00106 while(blkCnt > 0u)
00107 {
00108 /* C[0] = sqrt(A[0] * A[0] + A[1] * A[1]) */
00109 real = *pSrc++;
00110 imag = *pSrc++;
00111 acc0 = __SMUAD(real, real);
00112 acc1 = __SMUAD(imag, imag);
00113 /* store the result in 2.14 format in the destination buffer. */
00114 arm_sqrt_q15((q15_t) (((q63_t) acc0 + acc1) >> 17), pDst++);
00115
00116 /* Decrement the loop counter */
00117 blkCnt--;
00118 }
00119 }
00120
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