The CMSIS DSP 5 library
Dependents: Nucleo-Heart-Rate ejercicioVrms2 PROYECTOFINAL ejercicioVrms ... more
functions/ComplexMathFunctions/arm_cmplx_dot_prod_f32.c
- Committer:
- xorjoep
- Date:
- 2018-06-21
- Revision:
- 3:4098b9d3d571
- Parent:
- 1:24714b45cd1b
File content as of revision 3:4098b9d3d571:
/* ---------------------------------------------------------------------- * Project: CMSIS DSP Library * Title: arm_cmplx_dot_prod_f32.c * Description: Floating-point complex dot product * * $Date: 27. January 2017 * $Revision: V.1.5.1 * * Target Processor: Cortex-M cores * -------------------------------------------------------------------- */ /* * Copyright (C) 2010-2017 ARM Limited or its affiliates. All rights reserved. * * SPDX-License-Identifier: Apache-2.0 * * Licensed under the Apache License, Version 2.0 (the License); you may * not use this file except in compliance with the License. * You may obtain a copy of the License at * * www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an AS IS BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "arm_math.h" /** * @ingroup groupCmplxMath */ /** * @defgroup cmplx_dot_prod Complex Dot Product * * Computes the dot product of two complex vectors. * The vectors are multiplied element-by-element and then summed. * * The <code>pSrcA</code> points to the first complex input vector and * <code>pSrcB</code> points to the second complex input vector. * <code>numSamples</code> specifies the number of complex samples * and the data in each array is stored in an interleaved fashion * (real, imag, real, imag, ...). * Each array has a total of <code>2*numSamples</code> values. * * The underlying algorithm is used: * <pre> * realResult=0; * imagResult=0; * for(n=0; n<numSamples; n++) { * realResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+0] - pSrcA[(2*n)+1]*pSrcB[(2*n)+1]; * imagResult += pSrcA[(2*n)+0]*pSrcB[(2*n)+1] + pSrcA[(2*n)+1]*pSrcB[(2*n)+0]; * } * </pre> * * There are separate functions for floating-point, Q15, and Q31 data types. */ /** * @addtogroup cmplx_dot_prod * @{ */ /** * @brief Floating-point complex dot product * @param *pSrcA points to the first input vector * @param *pSrcB points to the second input vector * @param numSamples number of complex samples in each vector * @param *realResult real part of the result returned here * @param *imagResult imaginary part of the result returned here * @return none. */ void arm_cmplx_dot_prod_f32( float32_t * pSrcA, float32_t * pSrcB, uint32_t numSamples, float32_t * realResult, float32_t * imagResult) { float32_t real_sum = 0.0f, imag_sum = 0.0f; /* Temporary result storage */ float32_t a0,b0,c0,d0; #if defined (ARM_MATH_DSP) /* Run the below code for Cortex-M4 and Cortex-M3 */ uint32_t blkCnt; /* loop counter */ /*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) { a0 = *pSrcA++; b0 = *pSrcA++; c0 = *pSrcB++; d0 = *pSrcB++; real_sum += a0 * c0; imag_sum += a0 * d0; real_sum -= b0 * d0; imag_sum += b0 * c0; a0 = *pSrcA++; b0 = *pSrcA++; c0 = *pSrcB++; d0 = *pSrcB++; real_sum += a0 * c0; imag_sum += a0 * d0; real_sum -= b0 * d0; imag_sum += b0 * c0; a0 = *pSrcA++; b0 = *pSrcA++; c0 = *pSrcB++; d0 = *pSrcB++; real_sum += a0 * c0; imag_sum += a0 * d0; real_sum -= b0 * d0; imag_sum += b0 * c0; a0 = *pSrcA++; b0 = *pSrcA++; c0 = *pSrcB++; d0 = *pSrcB++; real_sum += a0 * c0; imag_sum += a0 * d0; real_sum -= b0 * d0; imag_sum += b0 * c0; /* Decrement the 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 & 0x3U; while (blkCnt > 0U) { a0 = *pSrcA++; b0 = *pSrcA++; c0 = *pSrcB++; d0 = *pSrcB++; real_sum += a0 * c0; imag_sum += a0 * d0; real_sum -= b0 * d0; imag_sum += b0 * c0; /* Decrement the loop counter */ blkCnt--; } #else /* Run the below code for Cortex-M0 */ while (numSamples > 0U) { a0 = *pSrcA++; b0 = *pSrcA++; c0 = *pSrcB++; d0 = *pSrcB++; real_sum += a0 * c0; imag_sum += a0 * d0; real_sum -= b0 * d0; imag_sum += b0 * c0; /* Decrement the loop counter */ numSamples--; } #endif /* #if defined (ARM_MATH_DSP) */ /* Store the real and imaginary results in the destination buffers */ *realResult = real_sum; *imagResult = imag_sum; } /** * @} end of cmplx_dot_prod group */