cic.cpp

CIC梳妆滤波器生成器

/*
                梳妆滤波器生成程序
 					v1.2
 
 
*/
#include<iostream>
#include<fstream>
#include<cmath>
#include<string>
#include<sstream>
using namespace std;
int main()
{
	unsigned int i=6;
	unsigned int j;
	unsigned int k=8;
	stringstream strStream;
	cout<<"Please input the length of the cic filter\n";
	cin >> i;
	cout<<"Please input the wide of the data\n";
	cin >> k;
	if(i<=1)
		cout<<"length must larger than 1\n";
	if(i<1)
		cout<<"wide must be 1 or larger\n";
	strStream << i << '_' << k;
	if(k==1) strStream << "bit";
	else strStream << "bits";
	string file = "cic" + strStream.str() + ".v";
	ofstream vfile(file.c_str());
	if(!vfile)
	{
		cout <<"error can not open cic.v";
		return 0;
	}
	vfile << "/*\n";
	vfile << "             CIC filter\n";
	vfile << "             length is "<< i <<"\n";
	vfile << "*/\n";
	vfile << "module cic(input clk,input ["<< k-1 <<":0] in,output reg ["<< k-1<<":0] out);\n";
	vfile << "    reg  ["<<(k-1)<<":0]temp["<< i-1 <<":0];\n";
	vfile << "    wire  ["<< k-1+ ceil(log2((double)i))<<":0] sum;\n";
	vfile << "	  integer i;\n";   
	vfile << "    always@(posedge clk)\n";
	vfile << "	  begin\n";
	vfile << "        temp[0]<= in;\n";
	vfile << "	      for(i=0;i<"<< i-2 <<";i=i+1)\n";
	vfile << "		       temp[i+1]<=temp[i];\n";
	vfile << "	      out <= sum / "<< i <<";\n" ;	
	vfile << "	  end\n";		
	vfile << "	  assign sum = in+temp[0]";
	for(j=1;j<i-1;j++)
	{
		vfile<<"+temp["<< j <<"]";
		if(j%8==0)vfile<<"\n"<<"	  ";
	}
    vfile << ";\n";
	vfile << "endmodule\n";
	//todo Generate testbench
	//ofstream tfile("cic_t.v");
	//tfile << "Test bench of cic filter\n";
	//tfile << "reg clk";
	
	return 0;
}