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77 lines
1.9 KiB
77 lines
1.9 KiB
library ieee;
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use ieee.std_logic_1164.all;
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package StringP is
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function to_char (data : in std_logic) return character;
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function to_char (data : in std_logic_vector(3 downto 0)) return character;
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function to_string (data : in std_logic) return string;
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function to_string (data : in std_logic_vector) return string;
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end package StringP;
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package body StringP is
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function to_char (data : in std_logic) return character is
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begin
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case data is
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when 'U' => return 'U';
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when 'X' => return 'X';
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when '0' => return '0';
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when '1' => return '1';
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when 'Z' => return 'Z';
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when 'W' => return 'W';
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when 'L' => return 'L';
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when 'H' => return 'H';
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when '-' => return '-';
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end case;
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end to_char;
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function to_char (data : in std_logic_vector(3 downto 0)) return character is
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begin
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case data is
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when x"0" => return '0';
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when x"1" => return '1';
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when x"2" => return '2';
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when x"3" => return '3';
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when x"4" => return '4';
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when x"5" => return '5';
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when x"6" => return '6';
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when x"7" => return '7';
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when x"8" => return '8';
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when x"9" => return '9';
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when x"A" => return 'A';
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when x"B" => return 'B';
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when x"C" => return 'C';
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when x"D" => return 'D';
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when x"E" => return 'E';
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when x"F" => return 'F';
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when others => return 'X';
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end case;
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end to_char;
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function to_string (data : in std_logic) return string is
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variable str : string(1 to 1);
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begin
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str(1) := to_char(data);
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return str;
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end function to_string;
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function to_string (data : in std_logic_vector) return string is
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variable v_str : string (1 to data'length);
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variable v_str_index : positive := 1;
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begin
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for i in data'range loop
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v_str(v_str_index) := to_char(data(i));
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v_str_index := v_str_index + 1;
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end loop;
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return v_str;
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end function to_string;
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end package body StringP;
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