HLS FFT的使用

代码改编自vivado hls自带的fft教程
fft_top.h

// 67d7842dbbe25473c3c32b93c0da8047785f30d78e8a024de1b57352245f9689
/*******************************************************************************
Vendor: Xilinx 
Associated Filename: fft_top.h
Purpose: Xilinx FFT IP-XACT IP in Vivado HLS
Revision History: September 26, 2013 - initial release
                                                
*******************************************************************************
#-  (c) Copyright 2011-2019 Xilinx, Inc. All rights reserved.
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#-  CRITICAL APPLICATIONS
#-  Xilinx products are not designed or intended to be fail-
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#- ************************************************************************


This file contains confidential and proprietary information of Xilinx, Inc. and 
is protected under U.S. and international copyright and other intellectual 
property laws.

DISCLAIMER
This disclaimer is not a license and does not grant any rights to the materials 
distributed herewith. Except as otherwise provided in a valid license issued to 
you by Xilinx, and to the maximum extent permitted by applicable law: 
(1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL FAULTS, AND XILINX 
HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, 
INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, OR 
FITNESS FOR ANY PARTICULAR PURPOSE; and (2) Xilinx shall not be liable (whether 
in contract or tort, including negligence, or under any other theory of 
liability) for any loss or damage of any kind or nature related to, arising under 
or in connection with these materials, including for any direct, or any indirect, 
special, incidental, or consequential loss or damage (including loss of data, 
profits, goodwill, or any type of loss or damage suffered as a result of any 
action brought by a third party) even if such damage or loss was reasonably 
foreseeable or Xilinx had been advised of the possibility of the same.

CRITICAL APPLICATIONS
Xilinx products are not designed or intended to be fail-safe, or for use in any 
application requiring fail-safe performance, such as life-support or safety 
devices or systems, Class III medical devices, nuclear facilities, applications 
related to the deployment of airbags, or any other applications that could lead 
to death, personal injury, or severe property or environmental damage 
(individually and collectively, "Critical Applications"). Customer assumes the 
sole risk and liability of any use of Xilinx products in Critical Applications, 
subject only to applicable laws and regulations governing limitations on product 
liability. 

THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE AT 
ALL TIMES.

*******************************************************************************/

#include "ap_fixed.h"
#include "hls_fft.h"

// configurable params
const char FFT_INPUT_WIDTH                     = 16;
const char FFT_OUTPUT_WIDTH                    = FFT_INPUT_WIDTH;
const char FFT_CONFIG_WIDTH                    = 8;
const char FFT_NFFT_MAX                        = 4;
const int  FFT_LENGTH                          = 1 << FFT_NFFT_MAX; 


#include 
using namespace std;

struct config1 : hls::ip_fft::params_t {
     
    static const unsigned ordering_opt = hls::ip_fft::natural_order;
    static const unsigned config_width = FFT_CONFIG_WIDTH;
    static const unsigned max_nfft=4;
};

typedef hls::ip_fft::config_t<config1> config_t;
typedef hls::ip_fft::status_t<config1> status_t;

typedef ap_fixed<FFT_INPUT_WIDTH,1> data_in_t;
typedef ap_fixed<FFT_OUTPUT_WIDTH,FFT_OUTPUT_WIDTH-FFT_INPUT_WIDTH+1> data_out_t;
typedef std::complex<data_in_t> cmpxDataIn;
typedef std::complex<data_out_t> cmpxDataOut;

void dummy_proc_fe(
    bool direction,
    config_t* config, 
    cmpxDataIn in[FFT_LENGTH], 
    cmpxDataIn out[FFT_LENGTH]);

void dummy_proc_be(
    status_t* status_in, 
    bool* ovflo,
    cmpxDataOut in[FFT_LENGTH], 
    cmpxDataOut out[FFT_LENGTH]);

void fft_top(
    bool direction,
    cmpxDataIn in[FFT_LENGTH],
    cmpxDataOut out[FFT_LENGTH],
    bool* ovflo);


FFT_INPUT_WIDTH和FFT_OUTPUT_WIDTH分别是输入输出数据的位宽,FFT_NFFT_MAX为FFT_LENGTH以2为底的对数,而FFT_LENGTH则是FFT变换的点数(即输入序列的长度),需要注意的是,更改了FFT_NFFT_MAX的值后,还需要在config1中加入**static const unsigned max_nfft=4**,这样才能真正生效,同时还需要修改FFT_CONFIG_WIDTH的值
fft_top.cpp

// 67d7842dbbe25473c3c32b93c0da8047785f30d78e8a024de1b57352245f9689
/*******************************************************************************
Vendor: Xilinx 
Associated Filename: fft_top.cpp
Purpose: Xilinx FFT IP-XACT IP in Vivado HLS
Revision History: September 26, 2013 - initial release
                                                
*******************************************************************************
#-  (c) Copyright 2011-2019 Xilinx, Inc. All rights reserved.
#-
#-  This file contains confidential and proprietary information
#-  of Xilinx, Inc. and is protected under U.S. and
#-  international copyright and other intellectual property
#-  laws.
#-
#-  DISCLAIMER
#-  This disclaimer is not a license and does not grant any
#-  rights to the materials distributed herewith. Except as
#-  otherwise provided in a valid license issued to you by
#-  Xilinx, and to the maximum extent permitted by applicable
#-  law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND
#-  WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES
#-  AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING
#-  BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-
#-  INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and
#-  (2) Xilinx shall not be liable (whether in contract or tort,
#-  including negligence, or under any other theory of
#-  liability) for any loss or damage of any kind or nature
#-  related to, arising under or in connection with these
#-  materials, including for any direct, or any indirect,
#-  special, incidental, or consequential loss or damage
#-  (including loss of data, profits, goodwill, or any type of
#-  loss or damage suffered as a result of any action brought
#-  by a third party) even if such damage or loss was
#-  reasonably foreseeable or Xilinx had been advised of the
#-  possibility of the same.
#-
#-  CRITICAL APPLICATIONS
#-  Xilinx products are not designed or intended to be fail-
#-  safe, or for use in any application requiring fail-safe
#-  performance, such as life-support or safety devices or
#-  systems, Class III medical devices, nuclear facilities,
#-  applications related to the deployment of airbags, or any
#-  other applications that could lead to death, personal
#-  injury, or severe property or environmental damage
#-  (individually and collectively, "Critical
#-  Applications"). Customer assumes the sole risk and
#-  liability of any use of Xilinx products in Critical
#-  Applications, subject only to applicable laws and
#-  regulations governing limitations on product liability.
#-
#-  THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS
#-  PART OF THIS FILE AT ALL TIMES. 
#- ************************************************************************


This file contains confidential and proprietary information of Xilinx, Inc. and 
is protected under U.S. and international copyright and other intellectual 
property laws.

DISCLAIMER
This disclaimer is not a license and does not grant any rights to the materials 
distributed herewith. Except as otherwise provided in a valid license issued to 
you by Xilinx, and to the maximum extent permitted by applicable law: 
(1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL FAULTS, AND XILINX 
HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, 
INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, OR 
FITNESS FOR ANY PARTICULAR PURPOSE; and (2) Xilinx shall not be liable (whether 
in contract or tort, including negligence, or under any other theory of 
liability) for any loss or damage of any kind or nature related to, arising under 
or in connection with these materials, including for any direct, or any indirect, 
special, incidental, or consequential loss or damage (including loss of data, 
profits, goodwill, or any type of loss or damage suffered as a result of any 
action brought by a third party) even if such damage or loss was reasonably 
foreseeable or Xilinx had been advised of the possibility of the same.

CRITICAL APPLICATIONS
Xilinx products are not designed or intended to be fail-safe, or for use in any 
application requiring fail-safe performance, such as life-support or safety 
devices or systems, Class III medical devices, nuclear facilities, applications 
related to the deployment of airbags, or any other applications that could lead 
to death, personal injury, or severe property or environmental damage 
(individually and collectively, "Critical Applications"). Customer assumes the 
sole risk and liability of any use of Xilinx products in Critical Applications, 
subject only to applicable laws and regulations governing limitations on product 
liability. 

THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE AT 
ALL TIMES.

*******************************************************************************/


#include "fft_top.h"

void dummy_proc_fe(
    bool direction,
    config_t* config, 
    cmpxDataIn in[FFT_LENGTH], 
    cmpxDataIn out[FFT_LENGTH])
{
     
    int i; 
    config->setDir(direction);
    config->setSch(0xA);
    for (i=0; i< FFT_LENGTH; i++)
        out[i] = in[i];
}

void dummy_proc_be(
    status_t* status_in, 
    bool* ovflo,
    cmpxDataOut in[FFT_LENGTH], 
    cmpxDataOut out[FFT_LENGTH])
{
     
    int i; 
    for (i=0; i< FFT_LENGTH; i++)
        out[i] = in[i];
    *ovflo = status_in->getOvflo() & 0x1;
}


void fft_top(
    bool direction,
    complex<data_in_t> in[FFT_LENGTH],
    complex<data_out_t> out[FFT_LENGTH],
    bool* ovflo)
{
     
#pragma HLS interface ap_hs port=direction
#pragma HLS interface ap_fifo depth=1 port=ovflo
#pragma HLS interface ap_fifo depth=FFT_LENGTH port=in,out
#pragma HLS data_pack variable=in
#pragma HLS data_pack variable=out
#pragma HLS dataflow
    complex<data_in_t> xn[FFT_LENGTH];
    complex<data_out_t> xk[FFT_LENGTH];
    config_t fft_config;
    status_t fft_status;
   
    dummy_proc_fe(direction, &fft_config, in, xn);
    // FFT IP
    hls::fft<config1>(xn, xk, &fft_status, &fft_config);
    dummy_proc_be(&fft_status, ovflo, xk, out);
}


这里,config->setDir(direction)为设置FFT的方向,即FFT还是IFFT,direction为1时,为正向FFT,否则为IFFT。ovflo则是溢出信号,若计算过程发生溢出,则为1.
config->setSch(0xA)语句设置FFT计算单元每一级的右移位数,以防止计算过程中发生溢出,一般,右移的总的位数等于FFT计算的点数。
测试平台文件
fft_tb.cpp

// 67d7842dbbe25473c3c32b93c0da8047785f30d78e8a024de1b57352245f9689
/*******************************************************************************
Vendor: Xilinx 
Associated Filename: fft_tb.cpp
Purpose: Xilinx FFT IP-XACT IP in Vivado HLS
Revision History: September 26, 2013 - initial release
                                                
*******************************************************************************
#-  (c) Copyright 2011-2019 Xilinx, Inc. All rights reserved.
#-
#-  This file contains confidential and proprietary information
#-  of Xilinx, Inc. and is protected under U.S. and
#-  international copyright and other intellectual property
#-  laws.
#-
#-  DISCLAIMER
#-  This disclaimer is not a license and does not grant any
#-  rights to the materials distributed herewith. Except as
#-  otherwise provided in a valid license issued to you by
#-  Xilinx, and to the maximum extent permitted by applicable
#-  law: (1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND
#-  WITH ALL FAULTS, AND XILINX HEREBY DISCLAIMS ALL WARRANTIES
#-  AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, INCLUDING
#-  BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-
#-  INFRINGEMENT, OR FITNESS FOR ANY PARTICULAR PURPOSE; and
#-  (2) Xilinx shall not be liable (whether in contract or tort,
#-  including negligence, or under any other theory of
#-  liability) for any loss or damage of any kind or nature
#-  related to, arising under or in connection with these
#-  materials, including for any direct, or any indirect,
#-  special, incidental, or consequential loss or damage
#-  (including loss of data, profits, goodwill, or any type of
#-  loss or damage suffered as a result of any action brought
#-  by a third party) even if such damage or loss was
#-  reasonably foreseeable or Xilinx had been advised of the
#-  possibility of the same.
#-
#-  CRITICAL APPLICATIONS
#-  Xilinx products are not designed or intended to be fail-
#-  safe, or for use in any application requiring fail-safe
#-  performance, such as life-support or safety devices or
#-  systems, Class III medical devices, nuclear facilities,
#-  applications related to the deployment of airbags, or any
#-  other applications that could lead to death, personal
#-  injury, or severe property or environmental damage
#-  (individually and collectively, "Critical
#-  Applications"). Customer assumes the sole risk and
#-  liability of any use of Xilinx products in Critical
#-  Applications, subject only to applicable laws and
#-  regulations governing limitations on product liability.
#-
#-  THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS
#-  PART OF THIS FILE AT ALL TIMES. 
#- ************************************************************************


This file contains confidential and proprietary information of Xilinx, Inc. and 
is protected under U.S. and international copyright and other intellectual 
property laws.

DISCLAIMER
This disclaimer is not a license and does not grant any rights to the materials 
distributed herewith. Except as otherwise provided in a valid license issued to 
you by Xilinx, and to the maximum extent permitted by applicable law: 
(1) THESE MATERIALS ARE MADE AVAILABLE "AS IS" AND WITH ALL FAULTS, AND XILINX 
HEREBY DISCLAIMS ALL WARRANTIES AND CONDITIONS, EXPRESS, IMPLIED, OR STATUTORY, 
INCLUDING BUT NOT LIMITED TO WARRANTIES OF MERCHANTABILITY, NON-INFRINGEMENT, OR 
FITNESS FOR ANY PARTICULAR PURPOSE; and (2) Xilinx shall not be liable (whether 
in contract or tort, including negligence, or under any other theory of 
liability) for any loss or damage of any kind or nature related to, arising under 
or in connection with these materials, including for any direct, or any indirect, 
special, incidental, or consequential loss or damage (including loss of data, 
profits, goodwill, or any type of loss or damage suffered as a result of any 
action brought by a third party) even if such damage or loss was reasonably 
foreseeable or Xilinx had been advised of the possibility of the same.

CRITICAL APPLICATIONS
Xilinx products are not designed or intended to be fail-safe, or for use in any 
application requiring fail-safe performance, such as life-support or safety 
devices or systems, Class III medical devices, nuclear facilities, applications 
related to the deployment of airbags, or any other applications that could lead 
to death, personal injury, or severe property or environmental damage 
(individually and collectively, "Critical Applications"). Customer assumes the 
sole risk and liability of any use of Xilinx products in Critical Applications, 
subject only to applicable laws and regulations governing limitations on product 
liability. 

THIS COPYRIGHT NOTICE AND DISCLAIMER MUST BE RETAINED AS PART OF THIS FILE AT 
ALL TIMES.

*******************************************************************************/

#include 
#include 
#include 
#include 
#include "fft_top.h"
#include 

#include 
#include 
#include 

using namespace std;

int main()
{
     

    cmpxDataIn xn_input[FFT_LENGTH];
    cmpxDataOut xk_output[FFT_LENGTH];
	for(int i=0;i<FFT_LENGTH;i++){
     
		//cout<
		xn_input[i].real((data_in_t)((float)i/(float)FFT_LENGTH));
		xn_input[i].imag((data_in_t)((float)(-i)/(float)FFT_LENGTH));
	}
	bool ovflo;
    int FWD_INV=1;
	fft_top(FWD_INV, xn_input, xk_output, &ovflo);
    for(int i=0;i<FFT_LENGTH;i++)
    	cout<<"i="<<i<<":    "<<xk_output[i].real()<<"+"<<xk_output[i].imag()<<"j"<<endl;
    cout<<ovflo<<endl;
    return 0;

}


HLS仿真结果如下:
HLS FFT的使用_第1张图片python程序的运行结果如下,可以看出,误差允许范围内,该代码无误(已经除以16)
HLS FFT的使用_第2张图片

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