using a timer code snippet in a state machine

[brian02]

Hi,

I was wondering how to use this timer code snippet in a state machine:


library ieee;
use ieee.std_logic_1164.all;

entity ttimer is
port(reset, clock: in bit;
dig_sig0, dig_sig1: out bit_vector(7 downto 0);
sum: out integer range 0 to 59);
end ttimer;

architecture flow of ttimer is
signal s_sum: integer range 0 to 59;
signal s_clock: bit;
begin
time: process(clock, reset)
variable cnt: integer :=0;
begin
if reset = '0' then
cnt := 0;
elsif clock'event and clock = '1' then
if cnt = 25175000 then
s_clock <= not s_clock;
cnt := 0;
else
cnt := cnt +1;
end if;
end if;
end process;

time_move: process(reset, s_clock)
begin
if reset = '0' then
s_sum <= 0;
elsif s_clock'event and s_clock = '1' then
if s_sum = 59 then
s_sum <= 0;
else
s_sum <= s_sum +1;
end if;
end if;
end process;
sum <= s_sum;
with s_sum select
dig_sig1 <= "10000001" when 0,
"11001111" when 1,
"10010010" when 2,
"10000110" when 3,
"11001100" when 4,
"10100100" when 5,
"10100000" when 6,
"10001101" when 7,
"10000000" when 8,
"10000100" when 9,
"10000001" when 10,
"11001111" when 11,
"10010010" when 12,
"10000110" when 13,
"11001100" when 14,
"10100100" when 15,
"10100000" when 16,
"10001101" when 17,
"10000000" when 18,
"10000100" when 19,
"10000001" when 20,
"11001111" when 21,
"10010010" when 22,
"10000110" when 23,
"11001100" when 24,
"10100100" when 25,
"10100000" when 26,
"10001101" when 27,
"10000000" when 28,
"10000100" when 29,
"10000001" when 30,
"11001111" when 31,
"10010010" when 32,
"10000110" when 33,
"11001100" when 34,
"10100100" when 35,
"10100000" when 36,
"10001101" when 37,
"10000000" when 38,
"10000100" when 39,
"10000001" when 40,
"11001111" when 41,
"10010010" when 42,
"10000110" when 43,
"11001100" when 44,
"10100100" when 45,
"10100000" when 46,
"10001101" when 47,
"10000000" when 48,
"10000100" when 49,
"10000001" when 50,
"11001111" when 51,
"10010010" when 52,
"10000110" when 53,
"11001100" when 54,
"10100100" when 55,
"10100000" when 56,
"10001101" when 57,
"10000000" when 58,
"10000100" when 59;



dig_sig0 <= "10000001" when s_sum >= 0 and s_sum <= 9 else
"11001111" when s_sum >=10 and s_sum <= 19 else
"10010010" when s_sum >=20 and s_sum <= 29 else
"10000110" when s_sum >=30 and s_sum <= 39 else
"11001100" when s_sum >=40 and s_sum <= 49 else
"10100100" ;

end flow;


Suppose i want to know if 10 seconds have passed, how can i do that with this code in another process?

Thanks in advance!

 

[jeandelfrigo]

Brian,

Make another another counter process on the s_clock.
Make this a counter you can start and clear with strobes.
You write a terminal count by comparing the counter value with a signal in this way you have dynamical counter process (you can select 10 or 20 or whatever you want seconds).

regards

jeandelfrigo