VHDL@@@ how to turn on led depending on output condition!!!!!!!!!!!!!

[louis0206]

How do i display the values 0 to 9 on the 7-segment display and whenever the count is 1, 3 or 5, a Led will turn on. using vhdl

NEED HELP!! i was able to display the values 0to9 on the 7 segment display.
But the important part is when the count is 1, 3 or 5, the led has to light up.

What is need is: the code to light up led
How do i get the led to light up under this condition( IF AND ELSE?)

 

[hfbroady]

I would use the If, then,else statement. If you supplied the code I could help you better.

 

[RoboticsProfessor]

Depends on the language you are using and where you check the 1, 3, 5.
Suppose you are sending 4-bit BCD to a 7-segment decoder. Run the 4 bits to 4 input ports on a microprocessor.
Then read the four bits into a nibble (a 4-bit data type in some languages), say you store it in a variable called number...
In C, the code might look something like:

If (number == 1) || (number == 3) || (number == 5) // || is "OR" in C
LED_Output_Port = 1;
else
LED_Output_Port = 0;

 

[louis0206]

I would use the If, then,else statement. If you supplied the code I could help you better.

Theses are the codes to display the value 0-9 in the bcd counters:
Thanks in advance
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

entity bcd_counter is
port ( clk, reset_bar : in std_logic;
q : out std_logic_vector (3 downto 0));
end bcd_counter;

architecture flow of bcd_counter is

signal count_sig: unsigned (3 downto 0);

begin
process (clk, reset_bar)
begin
if (reset_bar = ‘1’) then
count_sig <= “0000”;

elsif falling_edge (clk) then
if (count_sig = 9) then
count_sig <= “0000”;
else
count_sig <= count_sig + 1;
end if;
end if;
end process;

q <= std_logic_vector (count_sig);

end flow;

 

[hfbroady]

If you use a case statement like this it should get you close, you may need to mess with a bit.

case count_sig is
when "0001" => sel <= '1';
when "0011" => sel <= '1';
when "0101" => sel <= '1';
when others => sel <= '0';
end case;

Then in your pin assignment sel will be an LED on your board.

With the code you have how did you get the 7 segment display to show the correct number? I have a FPGA (Altera Cyclone 2 board) just interested to know.

 

[louis0206]

If you use a case statement like this it should get you close, you may need to mess with a bit.

case count_sig is
when "0001" => sel <= '1';
when "0011" => sel <= '1';
when "0101" => sel <= '1';
when others => sel <= '0';
end case;

Then in your pin assignment sel will be an LED on your board.

With the code you have how did you get the 7 segment display to show the correct number? I have a FPGA (Altera Cyclone 2 board) just interested to know.

THANKS ALOT for the help! The board i'm using is " MAX7000S EPM7128SLC84-7
":-D