/github/workspace/src/TransformFunctions/plp_cfft_q16_parallel.c

Functions

	Name
void	plp_cfft_q16_parallel(const plp_cfft_instance_q16 * S, int16_t * p1, uint8_t ifftFlag, uint8_t bitReverseFlag, uint32_t deciPoint, uint32_t nPE) Glue code for quantized 16 bit complex fast fourier transform.

Functions Documentation

function plp_cfft_q16_parallel

void plp_cfft_q16_parallel(
    const plp_cfft_instance_q16 * S,
    int16_t * p1,
    uint8_t ifftFlag,
    uint8_t bitReverseFlag,
    uint32_t deciPoint,
    uint32_t nPE
)

Glue code for quantized 16 bit complex fast fourier transform.

Parameters:

• S points to an instance of the 16bit quantized CFFT structure
• p1 points to the complex data buffer of size 2*fftLen. Processing occurs in-place.
• ifftFlag flag that selects forward (ifftFlag=0) or inverse (ifftFlag=1) transform.
• bitReverseFlag flag that enables (bitReverseFlag=1) of disables (bitReverseFlag=0) bit reversal of output.
• deciPoint decimal point for right shift
• nPE Number of cores to use

Fixed point units input -> output dependent on length: len=16: Q1.15 -> Q5.11 len=32: Q1.15 -> Q6.10 len=64: Q1.15 -> Q7.9 len=128: Q1.15 -> Q8.8 len=256: Q1.15 -> Q9.7 len=512: Q1.15 -> Q10.6 len=1024: Q1.15 -> Q11.5 len=2048: Q1.15 -> Q12.4 len=4096: Q1.15 -> Q13.3

Source code

/* =====================================================================
 * Project:      PULP DSP Library
 * Title:        plp_cfft_q16.c
 * Description:  16-bit fixed point Fast Fourier Transform on Complex Input Data
 *
 * $Date:        05. August 2020
 * $Revision:    V0
 *
 * Target Processor: PULP cores
 * ===================================================================== */
/*
 * Copyright (C) 2020 ETH Zurich and University of Bologna. All rights reserved.
 *
 * Author: Michael Rogenmoser, 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.
 */

#include "plp_math.h"

void plp_cfft_q16_parallel(const plp_cfft_instance_q16 *S,
                           int16_t *p1,
                           uint8_t ifftFlag,
                           uint8_t bitReverseFlag,
                           uint32_t deciPoint,
                           uint32_t nPE){

    if (hal_cluster_id() == ARCHI_FC_CID) {
        printf("parallel processing supported only for cluster side\n");
        return;
    } else {
        plp_cfft_instance_q16_parallel args = {
            .S = S, .p1 = p1, .ifftFlag = ifftFlag, .bitReverseFlag = bitReverseFlag, .deciPoint = deciPoint, .nPE = nPE
        };

        hal_cl_team_fork(nPE, plp_cfft_q16p_xpulpv2, (void *)&args);
    }
}

---

Updated on 2023-03-01 at 16:16:33 +0000