/* ----------------------------------------------------------------------
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* $Date: 15. July 2011
* $Revision: V1.0.10
*
* Project: CMSIS DSP Library
* Title: arm_cmplx_mult_real_f32.c
*
* Description: Floating-point complex by real multiplication
*
* 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 groupCmplxMath
*/
/**
* @defgroup CmplxByRealMult Complex-by-Real Multiplication
*
* Multiplies a complex vector by a real vector and generates a complex result.
* The data in the complex arrays is stored in an interleaved fashion
* (real, imag, real, imag, ...).
* The parameter numSamples
represents the number of complex
* samples processed. The complex arrays have a total of 2*numSamples
* real values while the real array has a total of numSamples
* real values.
*
* The underlying algorithm is used:
*
*
* for(n=0; n* * There are separate functions for floating-point, Q15, and Q31 data types. */ /** * @addtogroup CmplxByRealMult * @{ */ /** * @brief Floating-point complex-by-real multiplication * @param[in] *pSrcCmplx points to the complex input vector * @param[in] *pSrcReal points to the real input vector * @param[out] *pCmplxDst points to the complex output vector * @param[in] numSamples number of samples in each vector * @return none. */ void arm_cmplx_mult_real_f32( float32_t * pSrcCmplx, float32_t * pSrcReal, float32_t * pCmplxDst, uint32_t numSamples) { float32_t in; /* Temporary variable to store input value */ #ifndef ARM_MATH_CM0 /* Run the below code for Cortex-M4 and Cortex-M3 */ uint32_t blkCnt; /* loop counters */ /* loop Unrolling */ blkCnt = numSamples >> 2u; /* First part of the processing with loop unrolling. Compute 4 outputs at a time. ** a second loop below computes the remaining 1 to 3 samples. */ while(blkCnt > 0u) { /* C[2 * i] = A[2 * i] * B[i]. */ /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ in = *pSrcReal++; /* store the result in the destination buffer. */ *pCmplxDst++ = (*pSrcCmplx++) * (in); *pCmplxDst++ = (*pSrcCmplx++) * (in); in = *pSrcReal++; *pCmplxDst++ = (*pSrcCmplx++) * (in); *pCmplxDst++ = (*pSrcCmplx++) * (in); in = *pSrcReal++; *pCmplxDst++ = (*pSrcCmplx++) * (in); *pCmplxDst++ = (*pSrcCmplx++) * (in); in = *pSrcReal++; *pCmplxDst++ = (*pSrcCmplx++) * (in); *pCmplxDst++ = (*pSrcCmplx++) * (in); /* Decrement the numSamples loop counter */ blkCnt--; } /* If the numSamples is not a multiple of 4, compute any remaining output samples here. ** No loop unrolling is used. */ blkCnt = numSamples % 0x4u; while(blkCnt > 0u) { /* C[2 * i] = A[2 * i] * B[i]. */ /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ in = *pSrcReal++; /* store the result in the destination buffer. */ *pCmplxDst++ = (*pSrcCmplx++) * (in); *pCmplxDst++ = (*pSrcCmplx++) * (in); /* Decrement the numSamples loop counter */ blkCnt--; } #else /* Run the below code for Cortex-M0 */ while(numSamples > 0u) { /* realOut = realA * realB. */ /* imagOut = imagA * realB. */ in = *pSrcReal++; /* store the result in the destination buffer. */ *pCmplxDst++ = (*pSrcCmplx++) * (in); *pCmplxDst++ = (*pSrcCmplx++) * (in); /* Decrement the numSamples loop counter */ numSamples--; } #endif /* #ifndef ARM_MATH_CM0 */ } /** * @} end of CmplxByRealMult group */