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
arm_cmplx_mult_real_f32.c
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_mult_real_f32.c 00009 * 00010 * Description: Floating-point complex by real multiplication 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 00029 /** 00030 * @ingroup groupCmplxMath 00031 */ 00032 00033 /** 00034 * @defgroup CmplxByRealMult Complex-by-Real Multiplication 00035 * 00036 * Multiplies a complex vector by a real vector and generates a complex result. 00037 * The data in the complex arrays is stored in an interleaved fashion 00038 * (real, imag, real, imag, ...). 00039 * The parameter <code>numSamples</code> represents the number of complex 00040 * samples processed. The complex arrays have a total of <code>2*numSamples</code> 00041 * real values while the real array has a total of <code>numSamples</code> 00042 * real values. 00043 * 00044 * The underlying algorithm is used: 00045 * 00046 * <pre> 00047 * for(n=0; n<numSamples; n++) { 00048 * pCmplxDst[(2*n)+0] = pSrcCmplx[(2*n)+0] * pSrcReal[n]; 00049 * pCmplxDst[(2*n)+1] = pSrcCmplx[(2*n)+1] * pSrcReal[n]; 00050 * } 00051 * </pre> 00052 * 00053 * There are separate functions for floating-point, Q15, and Q31 data types. 00054 */ 00055 00056 /** 00057 * @addtogroup CmplxByRealMult 00058 * @{ 00059 */ 00060 00061 00062 /** 00063 * @brief Floating-point complex-by-real multiplication 00064 * @param[in] *pSrcCmplx points to the complex input vector 00065 * @param[in] *pSrcReal points to the real input vector 00066 * @param[out] *pCmplxDst points to the complex output vector 00067 * @param[in] numSamples number of samples in each vector 00068 * @return none. 00069 */ 00070 00071 void arm_cmplx_mult_real_f32( 00072 float32_t * pSrcCmplx, 00073 float32_t * pSrcReal, 00074 float32_t * pCmplxDst, 00075 uint32_t numSamples) 00076 { 00077 float32_t in; /* Temporary variable to store input value */ 00078 uint32_t blkCnt; /* loop counters */ 00079 00080 /* loop Unrolling */ 00081 blkCnt = numSamples >> 2u; 00082 00083 /* First part of the processing with loop unrolling. Compute 4 outputs at a time. 00084 ** a second loop below computes the remaining 1 to 3 samples. */ 00085 while(blkCnt > 0u) 00086 { 00087 /* C[2 * i] = A[2 * i] * B[i]. */ 00088 /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ 00089 in = *pSrcReal++; 00090 /* store the result in the destination buffer. */ 00091 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00092 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00093 00094 in = *pSrcReal++; 00095 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00096 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00097 00098 in = *pSrcReal++; 00099 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00100 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00101 00102 in = *pSrcReal++; 00103 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00104 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00105 00106 /* Decrement the numSamples loop counter */ 00107 blkCnt--; 00108 } 00109 00110 /* If the numSamples is not a multiple of 4, compute any remaining output samples here. 00111 ** No loop unrolling is used. */ 00112 blkCnt = numSamples % 0x4u; 00113 00114 while(blkCnt > 0u) 00115 { 00116 /* C[2 * i] = A[2 * i] * B[i]. */ 00117 /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */ 00118 in = *pSrcReal++; 00119 /* store the result in the destination buffer. */ 00120 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00121 *pCmplxDst++ = (*pSrcCmplx++) * (in); 00122 00123 /* Decrement the numSamples loop counter */ 00124 blkCnt--; 00125 } 00126 } 00127 00128 /** 00129 * @} end of CmplxByRealMult group 00130 */
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