first Hint:
GHDL can read files. I am use this input often in my testbenchs.
The following process inside a testbench handles the file input.
process
constant file_name : string := "request.hex";
file in_file : f_byte open read_mode is file_name;
--variable in_line,out_line: line;
variable good : boolean;
variable a : character;
variable I : integer := 0;
begin
wr_en <= '0';
wait for 100 ns;
--while (not endfile(in_file)) loop
while i < 2000 loop
I := I+1;
wait until clk = '1';
wr_en <= '1';
if not endfile (in_file) then
read(in_file, a);
else wr_en <= '0';
end if;
data_in <= std_logic_vector(to_unsigned(character'pos(a), 8));
--very tricky the conversation
end loop;
wr_en <= '0';
end process;
the second hint
is only for Linux. A serial port interface with VHPI and connect
with socat two ttys.
This is very tricky.
the third hint
use a softcore for your interpreter.
René Doß
On 02/27/2014 09:02 AM, Svenn Are Bjerkem wrote:
Hi,
this is probably slightly off-topic, but maybe related.
The FPGA I am programming with VHDL is to be tested. It communicates
with the outside world through UART. I send a command, receive a
command and react to that command by sending a different command, or
in the case of error, resend the previous command. The commands are
long ASN.1 coded octet strings.
Currently I use Tcl to have the serial port in an event loop to be
able to react asynchronously to the results coming from the FPGA.
Writing the state-machine is a bit awkward, and it frustrates me that
I can write a hardware FSM fairly easy in VHDL, but not in any
programming language that I know (c, tcl, python)
I guess it is not easy to bind a serial port to ghdl and rely on the
concurrency in VHDL to read, interpret and send commands the way I do
in FPGA hardware, so my question is if there is a programming language
which would help me that I don't know about yet. Hopefully it should
run on both windows and Linux, but Linux-only is fine. Windows-only is
not so fine, but ok. Assume that I have only knowledge (and not deep
knowledge) of c, tcl, python, vhdl and ghdl.
Any comments welcome.
--
Svenn
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