Skip to content

/github/workspace/src/ComplexMathFunctions/kernels/plp_cmplx_mult_real_q16_rv32im.c

Functions

Name
void plp_cmplx_mult_real_q16_rv32im(const int16_t restrict pSrcCmplx, const int16_t restrict pSrcReal, int16_t *restrict pDst, uint32_t deciPoint, uint32_t numSamples)
16-bit integer complex-by-real multiplication

Functions Documentation

function plp_cmplx_mult_real_q16_rv32im

void plp_cmplx_mult_real_q16_rv32im(
    const int16_t *__restrict__ pSrcCmplx,
    const int16_t *__restrict__ pSrcReal,
    int16_t *__restrict__ pDst,
    uint32_t deciPoint,
    uint32_t numSamples
)

16-bit integer complex-by-real multiplication

Parameters:

  • pSrcCmplx points to complex input vector
  • pSrcReal points to real input vector
  • pCmplxDst points to complex output vector
  • deciPoint decimal point for right shift
  • numSamples number of samples in each vector

Return: none

16-bit fixed-point complex multiplied with real.

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_cmplx_mult_real_i16_rv32im.c
 * Description:  16-bit integer complex-by-real multiplication glue code
 *
 * $Date:        29. June 2020
 * $Revision:    V0
 *
 * Target Processor: PULP cores
 * ===================================================================== */
/*
 * Copyright (C) 2019 ETH Zurich and Ubiversity of Bologna.
 *
 * Author: Hanna Mueller, ETH Zurich
 *
 * 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.
 *
 * Notice: project inspired by ARM CMSIS DSP and parts of source code
  ported and adopted for RISC-V PULP platform from ARM CMSIS DSP
 released under Copyright (C) 2010-2019 ARM Limited or its affiliates
  with Apache-2.0.
 */

#include "plp_math.h"

void plp_cmplx_mult_real_q16_rv32im(const int16_t *__restrict__ pSrcCmplx,
                                    const int16_t *__restrict__ pSrcReal,
                                    int16_t *__restrict__ pDst,
                                    uint32_t deciPoint,
                                    uint32_t numSamples) {
    uint32_t blkCnt; /* Loop counter */
    int16_t in;      /* Temporary variable */

    /* Initialize blkCnt with number of samples */
    blkCnt = 2 * numSamples;
    int8_t even = 1;
    while (blkCnt > 0U) {
        /* C[2 * i    ] = A[2 * i    ] * B[i]. */
        /* C[2 * i + 1] = A[2 * i + 1] * B[i]. */

        if (even == 1) {
            in = *pSrcReal++;
            /* store result in destination buffer. */
            *pDst++ = ((*pSrcCmplx++ * in)) >> deciPoint;
        } else {
            *pDst++ = ((*pSrcCmplx++ * in)) >> deciPoint;
        }
        even = !even;
        /* Decrement loop counter */
        blkCnt--;
    }
}

Updated on 2023-03-01 at 16:16:32 +0000