Up/down counter Quartus II UP2 board

Altera_Forum · ‎04-05-2010

Hi guys!!!

i'm new in altera forum, and in vhdl too.

i must to do this project in Quartus II with the support of UP 2 board:

design an up/down decimal counter that:

1. show the count in a two 7 segment display in the UP2 board;

2. we can select the initial number of the count by switchs;

3. pushing the button present in UP2 board the counter must invert the count.

Someone can help me???

I Thanks you advance..:D

Altera_Forum · ‎04-05-2010

Why don't you show us what you wrote until now so that we can give you some advice?

Altera_Forum · ‎04-06-2010

Use counter from LPM library. It has most of the functionality you ask for. You need to code a HEX-to-7-segment active low decoder.

Altera_Forum · ‎04-06-2010

before to show my vhdl code i thanks you for reply me :))))

this is my work until now:

library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

ENTITY counter IS

PORT(

clk : in BIT;

upordwn : in STD_LOGIC;

initial : in STD_LOGIC_VECTOR(7 DOWNTO 0);

count : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);

LED_1 : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);

LED_2 : OUT STD_LOGIC_VECTOR(7 DOWNTO 0);

LED_CENT : OUT STD_LOGIC_VECTOR(7 DOWNTO 0));

end counter;

ARCHITECTURE prova OF counter IS

SIGNAL totalbit : STD_LOGIC_VECTOR(7 DOWNTO 0);

SIGNAL up_four : STD_LOGIC_VECTOR(4 DOWNTO 0);

SIGNAL low_four : STD_LOGIC_VECTOR(4 DOWNTO 0);

BEGIN

PROCESS(clk)

--QUI DEVO INSERIRE IL VALORE INIZIALE

if(clk'EVENT AND clk='1') THEN

if (upordwn='1') THEN

totalbit <= totalbit+1;

else

totalbit <= totalbit-1;

end if;

END PROCESS;

low_four(0) <= totalbit(0);

low_four(1) <= totalbit(1);

low_four(2) <= totalbit(2);

low_four(3) <= totalbit(3);

up_four(0) <= totalbit(4);

up_four(1) <= totalbit(5);

up_four(2) <= totalbit(6);

up_four(3) <= totalbit(7);

WITH up_four SELECT

--abcdefg

LED_1 <= "00000011" WHEN "1111", -- 0

"10011111" WHEN "1110", -- 1

"00100101" WHEN "1101", -- 2

"00001101" WHEN "1100", -- 3

"10011001" WHEN "1011", -- 4

"01001001" WHEN "1010", -- 5

"01000001" WHEN "1001", -- 6

"00011111" WHEN "1000", -- 7

"00000001" WHEN "0111", -- 8

"00001001" WHEN "0110", -- 9

"00010001" WHEN "0101", -- A

"00000001" WHEN "0100", -- B

"01100011" WHEN "0011", -- C

"00000011" WHEN "0010", -- D

"01100001" WHEN "0001", -- E

"01110001" WHEN "0000", -- F

"00000011" WHEN OTHERS;

--Lower 4 bits

WITH low_four SELECT

--abcdefg

LED_2 <= "00000011" WHEN "1111", -- 0

"10011111" WHEN "1110", -- 1

"00100101" WHEN "1101", -- 2

"00001101" WHEN "1100", -- 3

"10011001" WHEN "1011", -- 4

"01001001" WHEN "1010", -- 5

"01000001" WHEN "1001", -- 6

"00011111" WHEN "1000", -- 7

"00000001" WHEN "0111", -- 8

"00001001" WHEN "0110", -- 9

"00010001" WHEN "0101", -- A

"00000001" WHEN "0100", -- B

"01100011" WHEN "0011", -- C

"00000011" WHEN "0010", -- D

"01100001" WHEN "0001", -- E

"01110001" WHEN "0000", -- F

"00000011" WHEN OTHERS;

count <= totalbit;

end prova;

I have two problems yet!

1. initialing a strart number for the count by 8 switches present in UP2 board;

2. show the result in decimal (not in hexadecimal format) in the 7segment display.

thanks again :D

Altera_Forum · ‎04-07-2010

You could include a reset signal input that would load the value from the initial input to the totalbits value.

You can design your process this way:

PROCESS (clk,reset)
  IF (reset='1') THEN
    -- initialization of signals and outputs
  ELSIF (clk'EVENT AND clk='1') THEN
    -- counting
  END IF;
END PROCESS;

To change from hexadecimal to decimal you can use the arithmetic library and divisions by 10.