URL
https://opencores.org/ocsvn/fade_ether_protocol/fade_ether_protocol/trunk
Subversion Repositories fade_ether_protocol
[/] [fade_ether_protocol/] [trunk/] [stable_jumbo_frames_version/] [fpga/] [src/] [rec_to_pkg.py] - Rev 44
Go to most recent revision | Compare with Previous | Blame | View Log
#!/usr/bin/python # The script below is written by Wojciech M. Zabolotny # wzab<at>ise.pw.edu.pl 27.09.2014 # it is published as PUBLIC DOMAIN import sys class field: last_bit = 0; def __init__(self,field_desc): fd = field_desc.split(",") self.fname = fd[0] #"std_logic" is handled in a special way if fd[1]=="std_logic": self.ftype = fd[1] self.b1=0 self.b2=0 elif not fd[1] in ["signed","unsigned","std_logic_vector"]: raise Exception("Wrong field type") else: self.ftype = fd[1] if len(fd)==3: self.b1=int(fd[2])-1 self.b2=0 elif len(fd)==4: self.b1=int(fd[2]) self.b2=int(fd[3]) else: raise Exception("Syntax error in line: "+field_desc) #Assign vector bits self.v1=field.last_bit self.v2=field.last_bit+abs(self.b2-self.b1) field.last_bit = self.v2+1 if len(sys.argv) != 2: print """ The rec_to_pkg scripts creates VHDL package for conversion between the VHDL records containing "signed", "unsigned", "std_logic_vector" and "std_logic" fields and std_logic_vectors. It should be called as: rec_to_pkg.py description_file where the description file should have the following syntax: #Optional comment line record record_name #optional comment lines #[...] field_name,signed_or_unsigned,width #or field_name,signed_or_unsigned,left_bit_nr,right_bit_nr end The generated package is written to the record_name_pkg.vhd file """ exit(0) fin=open(sys.argv[1]) #Read the full description of the type type_desc=[l.strip() for l in fin.readlines() if len(l) > 0 and l[0] != "#" ] #The first line should contain the record name l=type_desc[0].split(" ") if l[0] != "record": raise Exception("Syntax error! The first line should have form \"record name_of_type\"") type_name=l[1] pkg_name=type_name+"_pkg" #Prepare for analysis of fields msb=0 fields=[] end_found = False #Find the field definitions for l in type_desc[1:]: if l=="end": end_found=True break fields.append(field(l)) if not end_found: raise Exception("Syntax error: no \"end\" found") #If we got here, probably the syntax was correct #Lets generate the package p="""\ library ieee; use ieee.std_logic_1164.all; use ieee.numeric_std.all; """ p+="package "+pkg_name+" is\n\n" p+="type "+type_name+" is record\n" for f in fields: if f.ftype=="std_logic": s=" "+f.fname+" : "+f.ftype+";\n" else: s=" "+f.fname+" : "+f.ftype+"(" if f.b1 > f.b2: s=s+str(f.b1)+" downto "+str(f.b2)+");\n" else: s=s+str(f.b1)+" to "+str(f.b2)+");\n" p+=s p+="end record;\n\n" #Write width of our type p+="constant "+type_name+"_width : integer := "+str(field.last_bit)+";\n\n" #Write headers of conversion functions p+="function "+type_name+"_to_stlv(\n" p+=" constant din : "+type_name+")\n" p+=" return std_logic_vector;\n\n" p+="function stlv_to_"+type_name+"(\n" p+=" constant din : std_logic_vector)\n" p+=" return "+type_name+";\n\n" p+="end "+pkg_name+";\n\n" #Now the body of the package - the conversion functions p+="package body "+pkg_name+" is\n\n" # p+="function "+type_name+"_to_stlv(\n" p+=" constant din : "+type_name+")\n" p+=" return std_logic_vector is\n" p+=" variable res : std_logic_vector("+str(field.last_bit-1)+" downto 0);\n" p+="begin\n" for f in fields: if f.ftype=="std_logic": p+=" res("+str(f.v1)+") := din."+f.fname+";\n" else: p+=" res("+str(f.v2)+" downto "+str(f.v1)+ ") := std_logic_vector(din."+f.fname+");\n" p+=" return res;\n" p+="end "+type_name+"_to_stlv;\n\n" # p+="function stlv_to_"+type_name+"(\n" p+=" constant din : std_logic_vector)\n" p+=" return "+type_name+" is\n" p+=" variable res : "+type_name+";\n" p+="begin\n" for f in fields: if f.ftype=="std_logic": p+=" res."+f.fname+" := din("+str(f.v1)+");\n" else: p+=" res."+f.fname+":="+f.ftype+"(din("+str(f.v2)+" downto "+str(f.v1)+"));\n" p+=" return res;\n" p+="end stlv_to_"+type_name+";\n\n" p+="end "+pkg_name+";\n" #The output file name fout_name=type_name+"_pkg.vhd" fout=open(fout_name,"w") fout.write(p) fout.close()
Go to most recent revision | Compare with Previous | Blame | View Log