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library ieee;
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use ieee.std_logic_1164.all;
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use std.textio.all;
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package txt_util is
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-- prints a message to the screen
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procedure print(text: string);
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-- prints the message when active
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-- useful for debug switches
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procedure print(active: boolean; text: string);
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-- converts std_logic into a character
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function chr(sl: std_logic) return character;
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-- converts std_logic into a string (1 to 1)
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function str(sl: std_logic) return string;
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-- converts std_logic_vector into a string (binary base)
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function str(slv: std_logic_vector) return string;
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-- converts boolean into a string
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function str(b: boolean) return string;
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-- converts an integer into a single character
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-- (can also be used for hex conversion and other bases)
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function chr(int: integer) return character;
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-- converts integer into string using specified base
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function str(int: integer; base: integer) return string;
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-- converts integer to string, using base 10
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function str(int: integer) return string;
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-- convert std_logic_vector into a string in hex format
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function hstr(slv: std_logic_vector) return string;
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-- functions to manipulate strings
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-----------------------------------
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-- convert a character to upper case
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function to_upper(c: character) return character;
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-- convert a character to lower case
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function to_lower(c: character) return character;
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-- convert a string to upper case
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function to_upper(s: string) return string;
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-- convert a string to lower case
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function to_lower(s: string) return string;
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-- functions to convert strings into other formats
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--------------------------------------------------
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-- converts a character into std_logic
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function to_std_logic(c: character) return std_logic;
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-- converts a string into std_logic_vector
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function to_std_logic_vector(s: string) return std_logic_vector;
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-- file I/O
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-----------
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-- read variable length string from input file
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procedure str_read(file in_file: TEXT;
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res_string: out string);
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-- print string to a file and start new line
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procedure print(file out_file: TEXT;
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new_string: in string);
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-- print character to a file and start new line
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procedure print(file out_file: TEXT;
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char: in character);
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end txt_util;
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package body txt_util is
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-- prints text to the screen
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procedure print(text: string) is
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variable msg_line: line;
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begin
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write(msg_line, text);
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writeline(output, msg_line);
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end print;
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-- prints text to the screen when active
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procedure print(active: boolean; text: string) is
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begin
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if active then
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print(text);
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end if;
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end print;
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-- converts std_logic into a character
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function chr(sl: std_logic) return character is
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variable c: character;
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begin
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case sl is
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when 'U' => c:= 'U';
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when 'X' => c:= 'X';
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when '0' => c:= '0';
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when '1' => c:= '1';
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when 'Z' => c:= 'Z';
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when 'W' => c:= 'W';
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when 'L' => c:= 'L';
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when 'H' => c:= 'H';
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when '-' => c:= '-';
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end case;
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return c;
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end chr;
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-- converts std_logic into a string (1 to 1)
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function str(sl: std_logic) return string is
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variable s: string(1 to 1);
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begin
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s(1) := chr(sl);
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return s;
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end str;
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-- converts std_logic_vector into a string (binary base)
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-- (this also takes care of the fact that the range of
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-- a string is natural while a std_logic_vector may
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-- have an integer range)
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function str(slv: std_logic_vector) return string is
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variable result : string (1 to slv'length);
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variable r : integer;
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begin
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r := 1;
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for i in slv'range loop
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result(r) := chr(slv(i));
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r := r + 1;
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end loop;
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return result;
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end str;
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function str(b: boolean) return string is
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begin
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if b then
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return "true";
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else
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return "false";
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end if;
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end str;
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-- converts an integer into a character
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-- for 0 to 9 the obvious mapping is used, higher
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-- values are mapped to the characters A-Z
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-- (this is usefull for systems with base > 10)
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-- (adapted from Steve Vogwell's posting in comp.lang.vhdl)
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function chr(int: integer) return character is
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variable c: character;
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begin
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case int is
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when 0 => c := '0';
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when 1 => c := '1';
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when 2 => c := '2';
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when 3 => c := '3';
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when 4 => c := '4';
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when 5 => c := '5';
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when 6 => c := '6';
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when 7 => c := '7';
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when 8 => c := '8';
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when 9 => c := '9';
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when 10 => c := 'A';
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when 11 => c := 'B';
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when 12 => c := 'C';
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when 13 => c := 'D';
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when 14 => c := 'E';
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when 15 => c := 'F';
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when 16 => c := 'G';
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when 17 => c := 'H';
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when 18 => c := 'I';
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when 19 => c := 'J';
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when 20 => c := 'K';
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when 21 => c := 'L';
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when 22 => c := 'M';
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when 23 => c := 'N';
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when 24 => c := 'O';
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when 25 => c := 'P';
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when 26 => c := 'Q';
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when 27 => c := 'R';
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when 28 => c := 'S';
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when 29 => c := 'T';
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when 30 => c := 'U';
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when 31 => c := 'V';
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when 32 => c := 'W';
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when 33 => c := 'X';
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when 34 => c := 'Y';
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when 35 => c := 'Z';
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when others => c := '?';
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end case;
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return c;
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end chr;
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-- convert integer to string using specified base
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-- (adapted from Steve Vogwell's posting in comp.lang.vhdl)
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function str(int: integer; base: integer) return string is
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variable temp: string(1 to 10);
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variable num: integer;
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variable abs_int: integer;
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variable len: integer := 1;
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variable power: integer := 1;
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begin
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-- bug fix for negative numbers
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abs_int := abs(int);
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num := abs_int;
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while num >= base loop -- Determine how many
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len := len + 1; -- characters required
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num := num / base; -- to represent the
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end loop ; -- number.
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for i in len downto 1 loop -- Convert the number to
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temp(i) := chr(abs_int/power mod base); -- a string starting
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power := power * base; -- with the right hand
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end loop ; -- side.
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-- return result and add sign if required
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if int < 0 then
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return '-'& temp(1 to len);
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else
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return temp(1 to len);
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end if;
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end str;
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-- convert integer to string, using base 10
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function str(int: integer) return string is
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begin
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return str(int, 10) ;
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end str;
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-- converts a std_logic_vector into a hex string.
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function hstr(slv: std_logic_vector) return string is
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variable hexlen: integer;
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variable longslv : std_logic_vector(67 downto 0) := (others => '0');
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variable hex : string(1 to 16);
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variable fourbit : std_logic_vector(3 downto 0);
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begin
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hexlen := (slv'left+1)/4;
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if (slv'left+1) mod 4 /= 0 then
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hexlen := hexlen + 1;
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end if;
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longslv(slv'left downto 0) := slv;
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for i in (hexlen -1) downto 0 loop
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fourbit := longslv(((i*4)+3) downto (i*4));
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case fourbit is
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when "0000" => hex(hexlen -I) := '0';
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when "0001" => hex(hexlen -I) := '1';
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when "0010" => hex(hexlen -I) := '2';
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when "0011" => hex(hexlen -I) := '3';
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when "0100" => hex(hexlen -I) := '4';
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when "0101" => hex(hexlen -I) := '5';
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when "0110" => hex(hexlen -I) := '6';
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when "0111" => hex(hexlen -I) := '7';
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when "1000" => hex(hexlen -I) := '8';
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when "1001" => hex(hexlen -I) := '9';
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when "1010" => hex(hexlen -I) := 'A';
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when "1011" => hex(hexlen -I) := 'B';
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when "1100" => hex(hexlen -I) := 'C';
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when "1101" => hex(hexlen -I) := 'D';
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when "1110" => hex(hexlen -I) := 'E';
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when "1111" => hex(hexlen -I) := 'F';
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when "ZZZZ" => hex(hexlen -I) := 'z';
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when "UUUU" => hex(hexlen -I) := 'u';
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when "XXXX" => hex(hexlen -I) := 'x';
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when others => hex(hexlen -I) := '?';
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end case;
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end loop;
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return hex(1 to hexlen);
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end hstr;
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-- functions to manipulate strings
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-----------------------------------
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-- convert a character to upper case
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function to_upper(c: character) return character is
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variable u: character;
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begin
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case c is
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when 'a' => u := 'A';
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when 'b' => u := 'B';
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when 'c' => u := 'C';
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when 'd' => u := 'D';
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when 'e' => u := 'E';
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when 'f' => u := 'F';
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when 'g' => u := 'G';
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when 'h' => u := 'H';
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when 'i' => u := 'I';
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when 'j' => u := 'J';
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when 'k' => u := 'K';
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when 'l' => u := 'L';
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when 'm' => u := 'M';
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when 'n' => u := 'N';
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when 'o' => u := 'O';
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when 'p' => u := 'P';
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when 'q' => u := 'Q';
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when 'r' => u := 'R';
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when 's' => u := 'S';
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when 't' => u := 'T';
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when 'u' => u := 'U';
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when 'v' => u := 'V';
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when 'w' => u := 'W';
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when 'x' => u := 'X';
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when 'y' => u := 'Y';
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when 'z' => u := 'Z';
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when others => u := c;
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end case;
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return u;
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end to_upper;
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-- convert a character to lower case
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function to_lower(c: character) return character is
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variable l: character;
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begin
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case c is
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when 'A' => l := 'a';
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when 'B' => l := 'b';
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when 'C' => l := 'c';
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when 'D' => l := 'd';
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when 'E' => l := 'e';
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when 'F' => l := 'f';
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when 'G' => l := 'g';
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when 'H' => l := 'h';
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when 'I' => l := 'i';
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when 'J' => l := 'j';
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when 'K' => l := 'k';
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when 'L' => l := 'l';
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when 'M' => l := 'm';
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when 'N' => l := 'n';
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when 'O' => l := 'o';
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when 'P' => l := 'p';
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when 'Q' => l := 'q';
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when 'R' => l := 'r';
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when 'S' => l := 's';
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when 'T' => l := 't';
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when 'U' => l := 'u';
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when 'V' => l := 'v';
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when 'W' => l := 'w';
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when 'X' => l := 'x';
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when 'Y' => l := 'y';
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when 'Z' => l := 'z';
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when others => l := c;
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end case;
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return l;
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end to_lower;
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-- convert a string to upper case
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function to_upper(s: string) return string is
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variable uppercase: string (s'range);
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begin
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for i in s'range loop
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uppercase(i):= to_upper(s(i));
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end loop;
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return uppercase;
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end to_upper;
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-- convert a string to lower case
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function to_lower(s: string) return string is
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variable lowercase: string (s'range);
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begin
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for i in s'range loop
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lowercase(i):= to_lower(s(i));
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end loop;
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return lowercase;
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end to_lower;
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-- functions to convert strings into other types
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-- converts a character into a std_logic
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function to_std_logic(c: character) return std_logic is
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variable sl: std_logic;
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begin
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case c is
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when 'U' =>
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sl := 'U';
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when 'X' =>
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sl := 'X';
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when '0' =>
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sl := '0';
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when '1' =>
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sl := '1';
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when 'Z' =>
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sl := 'Z';
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when 'W' =>
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sl := 'W';
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when 'L' =>
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sl := 'L';
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when 'H' =>
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sl := 'H';
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when '-' =>
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sl := '-';
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when others =>
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sl := 'X';
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end case;
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return sl;
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end to_std_logic;
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-- converts a string into std_logic_vector
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function to_std_logic_vector(s: string) return std_logic_vector is
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variable slv: std_logic_vector(s'high-s'low downto 0);
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variable k: integer;
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begin
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k := s'high-s'low;
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for i in s'range loop
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slv(k) := to_std_logic(s(i));
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k := k - 1;
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end loop;
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return slv;
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end to_std_logic_vector;
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----------------
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-- file I/O --
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----------------
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-- read variable length string from input file
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procedure str_read(file in_file: TEXT;
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res_string: out string) is
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variable l: line;
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variable c: character;
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variable is_string: boolean;
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begin
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readline(in_file, l);
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-- clear the contents of the result string
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for i in res_string'range loop
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res_string(i) := ' ';
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end loop;
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-- read all characters of the line, up to the length
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-- of the results string
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for i in res_string'range loop
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read(l, c, is_string);
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res_string(i) := c;
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if not is_string then -- found end of line
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exit;
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end if;
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end loop;
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end str_read;
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-- print string to a file
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procedure print(file out_file: TEXT;
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new_string: in string) is
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variable l: line;
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begin
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write(l, new_string);
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writeline(out_file, l);
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end print;
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-- print character to a file and start new line
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procedure print(file out_file: TEXT;
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char: in character) is
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variable l: line;
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begin
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write(l, char);
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writeline(out_file, l);
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end print;
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-- appends contents of a string to a file until line feed occurs
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-- (LF is considered to be the end of the string)
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procedure str_write(file out_file: TEXT;
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new_string: in string) is
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begin
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for i in new_string'range loop
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print(out_file, new_string(i));
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if new_string(i) = LF then -- end of string
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exit;
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end if;
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end loop;
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end str_write;
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end txt_util;
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No newline at end of file
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No newline at end of file
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