Need help with file input..

[shashank]

We are trying this simple VHDL program to read a text file. But an
error keeps cropping up every time..
This program was a part of the standard templates in Xilinx 8.2i
package.
The small block of VHDL code is as follows:


entity file2 is
end file2;

architecture Behavioral of file2 is

begin

read_input: process
type char_file is file of character;
file c_file_handle: char_file;
variable C: character;
variable char_count: integer := 0;
begin
file_open(c_file_handle, "E:\04EE53_46\file1\test_file.txt",
READ_MODE);
while not endfile(c_file_handle) loop
read (c_file_handle, C) ;
char_count := char_count + 1; -- Keep track of the number
of
-- characters
end loop;
file_close(c_file_handle);
end process;

end Behavioral;


The error being shown is:

File <c_file_handle> does not exist.



\Will appreciate the help.
Thanks.

 

[Mike Treseler]

shashank wrote:

We are trying this simple VHDL program to read a text file. But an
error keeps cropping up every time..

Consider using vhdl constant arrays
or procedures to generate stimulus.
See the testbench example here:

http://home.comcast.net/~mike_treseler/

For an example of writing strings
with std.textio.write see the
procedure print in the
Bi-Directional port example.

read_input: process
type char_file is file of character;

That type will expect one long string of characters.

See the "Read, Write Binary File" example
if that is what you want.

File <c_file_handle> does not exist.

Maybe you have to write your file before
you try and read it. Good luck.

-- Mike Treseler