URL
https://opencores.org/ocsvn/wb_uart/wb_uart/trunk
Subversion Repositories wb_uart
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/wb_uart/trunk
- from Rev 17 to Rev 18
- ↔ Reverse comparison
Rev 17 → Rev 18
/src/txt_util.vhd
0,0 → 1,611
library ieee; |
use ieee.std_logic_1164.all; |
use std.textio.all; |
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package txt_util is |
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-- prints a message to the screen |
procedure print(text: string); |
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-- prints the message when active |
-- useful for debug switches |
procedure print(active: boolean; text: string); |
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-- converts std_logic into a character |
function chr(sl: std_logic) return character; |
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-- converts std_logic into a string (1 to 1) |
function str(sl: std_logic) return string; |
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-- converts std_logic_vector into a string (binary base) |
function str(slv: std_logic_vector) return string; |
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-- converts boolean into a string |
function str(b: boolean) return string; |
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-- converts an integer into a single character |
-- (can also be used for hex conversion and other bases) |
function chr(int: integer) return character; |
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-- converts integer into string using specified base |
function str(int: integer; base: integer) return string; |
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-- converts integer to string, using base 10 |
function str(int: integer) return string; |
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-- convert std_logic_vector into a string in hex format |
function hstr(slv: std_logic_vector) return string; |
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-- functions to manipulate strings |
----------------------------------- |
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-- convert a character to upper case |
function to_upper(c: character) return character; |
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-- convert a character to lower case |
function to_lower(c: character) return character; |
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-- convert a string to upper case |
function to_upper(s: string) return string; |
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-- convert a string to lower case |
function to_lower(s: string) return string; |
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-- functions to convert strings into other formats |
-------------------------------------------------- |
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-- converts a character into std_logic |
function to_std_logic(c: character) return std_logic; |
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-- converts a string into std_logic_vector |
function to_std_logic_vector(s: string) return std_logic_vector; |
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-- convert std_logic_vector to integer |
function to_integer (a: std_logic_vector) return integer; |
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-- file I/O |
----------- |
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-- read variable length string from input file |
procedure str_read(file in_file: TEXT; |
res_string: out string); |
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-- print string to a file and start new line |
procedure print(file out_file: TEXT; |
new_string: in string); |
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-- print character to a file and start new line |
procedure print(file out_file: TEXT; |
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 |
variable msg_line: line; |
begin |
write(msg_line, text); |
writeline(output, msg_line); |
end print; |
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-- prints text to the screen when active |
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procedure print(active: boolean; text: string) is |
begin |
if active then |
print(text); |
end if; |
end print; |
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-- converts std_logic into a character |
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function chr(sl: std_logic) return character is |
variable c: character; |
begin |
case sl is |
when 'U' => c:= 'U'; |
when 'X' => c:= 'X'; |
when '0' => c:= '0'; |
when '1' => c:= '1'; |
when 'Z' => c:= 'Z'; |
when 'W' => c:= 'W'; |
when 'L' => c:= 'L'; |
when 'H' => c:= 'H'; |
when '-' => c:= '-'; |
end case; |
return c; |
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 |
variable s: string(1 to 1); |
begin |
s(1) := chr(sl); |
return s; |
end str; |
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-- converts std_logic_vector into a string (binary base) |
-- (this also takes care of the fact that the range of |
-- a string is natural while a std_logic_vector may |
-- have an integer range) |
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function str(slv: std_logic_vector) return string is |
variable result : string (1 to slv'length); |
variable r : integer; |
begin |
r := 1; |
for i in slv'range loop |
result(r) := chr(slv(i)); |
r := r + 1; |
end loop; |
return result; |
end str; |
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function str(b: boolean) return string is |
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begin |
if b then |
return "true"; |
else |
return "false"; |
end if; |
end str; |
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-- converts an integer into a character |
-- for 0 to 9 the obvious mapping is used, higher |
-- values are mapped to the characters A-Z |
-- (this is usefull for systems with base > 10) |
-- (adapted from Steve Vogwell's posting in comp.lang.vhdl) |
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function chr(int: integer) return character is |
variable c: character; |
begin |
case int is |
when 0 => c := '0'; |
when 1 => c := '1'; |
when 2 => c := '2'; |
when 3 => c := '3'; |
when 4 => c := '4'; |
when 5 => c := '5'; |
when 6 => c := '6'; |
when 7 => c := '7'; |
when 8 => c := '8'; |
when 9 => c := '9'; |
when 10 => c := 'A'; |
when 11 => c := 'B'; |
when 12 => c := 'C'; |
when 13 => c := 'D'; |
when 14 => c := 'E'; |
when 15 => c := 'F'; |
when 16 => c := 'G'; |
when 17 => c := 'H'; |
when 18 => c := 'I'; |
when 19 => c := 'J'; |
when 20 => c := 'K'; |
when 21 => c := 'L'; |
when 22 => c := 'M'; |
when 23 => c := 'N'; |
when 24 => c := 'O'; |
when 25 => c := 'P'; |
when 26 => c := 'Q'; |
when 27 => c := 'R'; |
when 28 => c := 'S'; |
when 29 => c := 'T'; |
when 30 => c := 'U'; |
when 31 => c := 'V'; |
when 32 => c := 'W'; |
when 33 => c := 'X'; |
when 34 => c := 'Y'; |
when 35 => c := 'Z'; |
when others => c := '?'; |
end case; |
return c; |
end chr; |
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-- convert integer to string using specified base |
-- (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); |
variable num: integer; |
variable abs_int: integer; |
variable len: integer := 1; |
variable power: integer := 1; |
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begin |
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-- bug fix for negative numbers |
abs_int := abs(int); |
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num := abs_int; |
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while num >= base loop -- Determine how many |
len := len + 1; -- characters required |
num := num / base; -- to represent the |
end loop ; -- number. |
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for i in len downto 1 loop -- Convert the number to |
temp(i) := chr(abs_int/power mod base); -- a string starting |
power := power * base; -- with the right hand |
end loop ; -- side. |
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-- return result and add sign if required |
if int < 0 then |
return '-'& temp(1 to len); |
else |
return temp(1 to len); |
end if; |
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end str; |
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-- convert integer to string, using base 10 |
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. |
function hstr(slv: std_logic_vector) return string is |
variable hexlen: integer; |
variable longslv : std_logic_vector(67 downto 0) := (others => '0'); |
variable hex : string(1 to 16); |
variable fourbit : std_logic_vector(3 downto 0); |
begin |
hexlen := (slv'left+1)/4; |
if (slv'left+1) mod 4 /= 0 then |
hexlen := hexlen + 1; |
end if; |
longslv(slv'left downto 0) := slv; |
for i in (hexlen -1) downto 0 loop |
fourbit := longslv(((i*4)+3) downto (i*4)); |
case fourbit is |
when "0000" => hex(hexlen -I) := '0'; |
when "0001" => hex(hexlen -I) := '1'; |
when "0010" => hex(hexlen -I) := '2'; |
when "0011" => hex(hexlen -I) := '3'; |
when "0100" => hex(hexlen -I) := '4'; |
when "0101" => hex(hexlen -I) := '5'; |
when "0110" => hex(hexlen -I) := '6'; |
when "0111" => hex(hexlen -I) := '7'; |
when "1000" => hex(hexlen -I) := '8'; |
when "1001" => hex(hexlen -I) := '9'; |
when "1010" => hex(hexlen -I) := 'A'; |
when "1011" => hex(hexlen -I) := 'B'; |
when "1100" => hex(hexlen -I) := 'C'; |
when "1101" => hex(hexlen -I) := 'D'; |
when "1110" => hex(hexlen -I) := 'E'; |
when "1111" => hex(hexlen -I) := 'F'; |
when "ZZZZ" => hex(hexlen -I) := 'z'; |
when "UUUU" => hex(hexlen -I) := 'u'; |
when "XXXX" => hex(hexlen -I) := 'x'; |
when others => hex(hexlen -I) := '?'; |
end case; |
end loop; |
return hex(1 to hexlen); |
end hstr; |
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-- functions to manipulate strings |
----------------------------------- |
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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 |
when 'a' => u := 'A'; |
when 'b' => u := 'B'; |
when 'c' => u := 'C'; |
when 'd' => u := 'D'; |
when 'e' => u := 'E'; |
when 'f' => u := 'F'; |
when 'g' => u := 'G'; |
when 'h' => u := 'H'; |
when 'i' => u := 'I'; |
when 'j' => u := 'J'; |
when 'k' => u := 'K'; |
when 'l' => u := 'L'; |
when 'm' => u := 'M'; |
when 'n' => u := 'N'; |
when 'o' => u := 'O'; |
when 'p' => u := 'P'; |
when 'q' => u := 'Q'; |
when 'r' => u := 'R'; |
when 's' => u := 'S'; |
when 't' => u := 'T'; |
when 'u' => u := 'U'; |
when 'v' => u := 'V'; |
when 'w' => u := 'W'; |
when 'x' => u := 'X'; |
when 'y' => u := 'Y'; |
when 'z' => u := 'Z'; |
when others => u := c; |
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 |
when 'A' => l := 'a'; |
when 'B' => l := 'b'; |
when 'C' => l := 'c'; |
when 'D' => l := 'd'; |
when 'E' => l := 'e'; |
when 'F' => l := 'f'; |
when 'G' => l := 'g'; |
when 'H' => l := 'h'; |
when 'I' => l := 'i'; |
when 'J' => l := 'j'; |
when 'K' => l := 'k'; |
when 'L' => l := 'l'; |
when 'M' => l := 'm'; |
when 'N' => l := 'n'; |
when 'O' => l := 'o'; |
when 'P' => l := 'p'; |
when 'Q' => l := 'q'; |
when 'R' => l := 'r'; |
when 'S' => l := 's'; |
when 'T' => l := 't'; |
when 'U' => l := 'u'; |
when 'V' => l := 'v'; |
when 'W' => l := 'w'; |
when 'X' => l := 'x'; |
when 'Y' => l := 'y'; |
when 'Z' => l := 'z'; |
when others => l := c; |
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 |
uppercase(i):= to_upper(s(i)); |
end loop; |
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 |
lowercase(i):= to_lower(s(i)); |
end loop; |
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 |
variable sl: std_logic; |
begin |
case c is |
when 'U' => |
sl := 'U'; |
when 'X' => |
sl := 'X'; |
when '0' => |
sl := '0'; |
when '1' => |
sl := '1'; |
when 'Z' => |
sl := 'Z'; |
when 'W' => |
sl := 'W'; |
when 'L' => |
sl := 'L'; |
when 'H' => |
sl := 'H'; |
when '-' => |
sl := '-'; |
when others => |
sl := 'X'; |
end case; |
return sl; |
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 |
variable slv: std_logic_vector(s'high-s'low downto 0); |
variable k: integer; |
begin |
k := s'high-s'low; |
for i in s'range loop |
slv(k) := to_std_logic(s(i)); |
k := k - 1; |
end loop; |
return slv; |
end to_std_logic_vector; |
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-- convert std_logic_vector to integer |
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function to_integer (a: std_logic_vector) return integer is |
variable y: integer := 0; |
begin |
y := 0; |
if (a'length < 32) then |
for i in a'length-1 downto 0 loop |
y := y * 2; |
if (a(i) = '1') or (a(i) = 'H') then |
y := y + 1; |
elsif (a(i) = 'U') or (a(i) = 'X') or (a(i) = 'Z') or |
(a(i) = 'W') or (a(i) = '-') then |
y := y + 0; |
end if; |
end loop; |
else |
assert false |
report "Function = to_integer." & |
"The std_logic_vector input to this function MUST be less than 32 bits." |
severity error; |
end if; |
return y; -- y returns 0 if std_logic_vector is > 31 bits |
end to_integer; |
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---------------- |
-- file I/O -- |
---------------- |
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-- read variable length string from input file |
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procedure str_read(file in_file: TEXT; |
res_string: out string) is |
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variable l: line; |
variable c: character; |
variable is_string: boolean; |
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begin |
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readline(in_file, l); |
-- clear the contents of the result string |
for i in res_string'range loop |
res_string(i) := ' '; |
end loop; |
-- read all characters of the line, up to the length |
-- of the results string |
for i in res_string'range loop |
read(l, c, is_string); |
if not is_string then -- found end of line |
exit; |
end if; |
res_string(i) := c; |
end loop; |
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end str_read; |
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-- print string to a file |
procedure print(file out_file: TEXT; |
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); |
writeline(out_file, l); |
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end print; |
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-- print character to a file and start new line |
procedure print(file out_file: TEXT; |
char: in character) is |
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variable l: line; |
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begin |
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write(l, char); |
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 |
-- (LF is considered to be the end of the string) |
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procedure str_write(file out_file: TEXT; |
new_string: in string) is |
begin |
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for i in new_string'range loop |
print(out_file, new_string(i)); |
if new_string(i) = LF then -- end of string |
exit; |
end if; |
end loop; |
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end str_write; |
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end txt_util; |
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