Vhdl

[Altera_Forum]

I need help with the following task in the VHDL program: Based on the DE2 development board, design a 4-bit Johnson counter. The meter's status is to be displayed on 4 7-segment LED displays (eg 1110). The change in the meter's status is taking place run automatically, e.g. every 1s. Develop a test environment for the designed system. 

 I need to combine these two codes into one? 4-bit Johnson counter: library IEEE; use IEEE.STD_LOGIC_1164.ALL; entity Ring_counter is Port( CLOCK: in STD_LOGIC; RESET: in STD_LOGIC; Q: out STD_LOGIC_VECTOR( 3 downto 0 ) ); end Ring_counter; architecture Behavioral of Ring_counter is signal q_tmp: std_logic_vector( 3 downto 0 ):= "0001"; begin process( CLOCK, RESET ) begin if RESET = '1' then q_tmp <= "0001"; elsif Rising_edge( CLOCK ) then q_tmp( 1 ) <= q_tmp( 0 ); q_tmp( 2 ) <= q_tmp( 1 ); q_tmp( 3 ) <= q_tmp( 2 ); q_tmp( 0 ) <= q_tmp( 3 ); end if; end process; Q <= q_tmp; end Behavioral;

[Altera_Forum]

Operate the 4 segment display 7 

 library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity lcd_dek is port( din: in std_logic_vector( 3 downto 0 ); clk: in std_logic; bp: inout std_logic; segm_o: out std_logic_vector( 6 downto 0 ) ); end lcd_dek; architecture ar_dyn of lcd_dek is signal segm: std_logic_vector( 6 downto 0 ); begin with din select --gfedcba segm <= "0111111" when "0000", -- 0 "0000110" when "0001", -- 1 "1011011" when "0010", -- 2 "1001111" when "0011", -- 3 "1100110" when "0100", -- 4 "1101101" when "0101", -- 5 "1111101" when "0110", -- 6 "0000111" when "0111", -- 7 "1111111" when "1000", -- 8 "1101111" when "1001", -- 9 "0000000" when others; -- wygaszenie segm_o( 0 ) <= segm( 0 ) xor bp; segm_o( 1 ) <= segm( 1 ) xor bp; segm_o( 2 ) <= segm( 2 ) xor bp; segm_o( 3 ) <= segm( 3 ) xor bp; segm_o( 4 ) <= segm( 4 ) xor bp; segm_o( 5 ) <= segm( 5 ) xor bp; segm_o( 6 ) <= segm( 6 ) xor bp; bp <= clk; end ar_dyn   I am asking you to check the correctness and help in this task

[Altera_Forum]

Hi, 

  --- Quote Start ---  I need to combine these two codes into one? 4-bit Johnson counter:  --- Quote End ---   1. Either you combine these two entities in one or instantiate the “lcd_dek” entity in “Ring_counter” entity with required signals/variables & component declaration. 2. Check the DE2 development board crystal frequency & write the vhdl code to step down the frequency up to few Hz then & then only you can observe the display.  3. Write the test bench & check functionality. 4. The better way, first try to display simple program like “Hello world” on the DE2 development board.  Let me know if this has helped resolve the issue you are facing or if you need any further assistance.  Best Regards Vikas Jathar  (This message was posted on behalf of Intel Corporation)

[Altera_Forum]

Hello there, this code did not work, so I created a new 4-bit counter and text environment for it but I can not display the signal on 4 7- segment displays ???? 

 architecture beh of johnson_counter is signal opt: std_logic_vector( 3 downto 0 ); begin process( clk, rst ) begin if( rst = '1' ) then opt <= "0000"; elsif( rising_edge( clk ) ) then opt <=( not opt( 0 ) ) & opt( 3 downto 1 ); end if; end process; op <= opt; end beh; library IEEE; use IEEE.STD_LOGIC_1164.ALL; entity johnson_counter_tb is end johnson_counter_tb; architecture Behavioral of johnson_counter_tb is component johnson_counter is port( clk: in std_logic; rst: in std_logic; op: out std_logic_vector( 3 downto 0 ) ); end component; signal clk_tb, rst_tb: std_logic:= '1'; signal op_tb: std_logic_vector( 3 downto 0 ); constant clk_period: time:= 10 ns; begin DUT: johnson_counter port map( clk_tb, rst_tb, op_tb ); clk_process: process begin clk_tb <= not( clk_tb ); wait for clk_period / 2; end process; main_process: process begin wait for 10 ns; rst_tb <= '0'; wait for 100 ns; end process; end Behavioral;

[Altera_Forum]

What is the result of your testbench? What did you expect and what did you get?

[Altera_Forum]

In my task, it's all about making any Jonson counter. Which will be displayed on 4 seven segment LED displays. The status of the display changes every 1s. And develop a text environment.

[Altera_Forum]

If I'm not mistaken the last code you provided, if connected to 4 leds, will turn each led on one by one, until all 4 are on, and then turn them off. If you intended to use those signals on the common pins of the 7 segment displays it will not work as expected because you will have often several display activated at the same time. The first code you provided will be better suited for this. 

You have the code to control the common pin, and the code to translate from a binary value to 7 segments. Now you need to implement registers with BCD counters and connect everything together.

[Altera_Forum]

library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; entity Counter2_VHDL is port( Clock_enable_B: in std_logic; Clock: in std_logic; Reset: in std_logic; Output: out std_logic_vector(0 to 3)); end Counter2_VHDL; architecture Behavioral of Counter2_VHDL is signal temp: std_logic_vector(0 to 3); begin process(Clock,Reset) begin if Reset='1' then temp <= "0000"; elsif(rising_edge(Clock)) then if Clock_enable_B='0' then if temp="1001" then temp<="0000"; else temp <= temp + 1; end if; end if; end if; end process; Output <= temp; end Behavioral;

[Altera_Forum]

Hi, 

Have you resolved the issue which was you facing? What are you trying to do with this code in previous post?   Best Regards Vikas Jathar  (This message was posted on behalf of Intel Corporation)

[Altera_Forum]

I need a course of time or some simulation this task the code is working correctly I'm sure but I do not have access to the program anymore. 

 library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.std_logic_unsigned.all; entity seven_segment_display_VHDL is Port ( clock_100Mhz : in STD_LOGIC;-- 100Mhz clock on Basys 3 FPGA board reset : in STD_LOGIC; -- reset Anode_Activate : out STD_LOGIC_VECTOR (3 downto 0);-- 4 Anode signals LED_out : out STD_LOGIC_VECTOR (6 downto 0));-- Cathode patterns of 7-segment display end seven_segment_display_VHDL; architecture Behavioral of seven_segment_display_VHDL is signal one_second_counter: STD_LOGIC_VECTOR (27 downto 0); -- counter for generating 1-second clock enable signal one_second_enable: std_logic; -- one second enable for counting numbers signal displayed_number: STD_LOGIC_VECTOR (15 downto 0); -- counting decimal number to be displayed on 4-digit 7-segment display signal LED_BCD: STD_LOGIC_VECTOR (3 downto 0); signal refresh_counter: STD_LOGIC_VECTOR (19 downto 0); -- creating 10.5ms refresh period signal LED_activating_counter: std_logic_vector(1 downto 0); -- the other 2-bit for creating 4 LED-activating signals -- count 0 -> 1 -> 2 -> 3 -- activates LED1 LED2 LED3 LED4 -- and repeat begin -- VHDL code for BCD to 7-segment decoder -- Cathode patterns of the 7-segment LED display process(LED_BCD) begin case LED_BCD is when "0000" => LED_out <= "0000001"; -- "0" when "0001" => LED_out <= "1001111"; -- "1" when "0010" => LED_out <= "0010010"; -- "2" when "0011" => LED_out <= "0000110"; -- "3" when "0100" => LED_out <= "1001100"; -- "4" when "0101" => LED_out <= "0100100"; -- "5" when "0110" => LED_out <= "0100000"; -- "6" when "0111" => LED_out <= "0001111"; -- "7" when "1000" => LED_out <= "0000000"; -- "8" when "1001" => LED_out <= "0000100"; -- "9" when "1010" => LED_out <= "0000010"; -- a when "1011" => LED_out <= "1100000"; -- b when "1100" => LED_out <= "0110001"; -- C when "1101" => LED_out <= "1000010"; -- d when "1110" => LED_out <= "0110000"; -- E when "1111" => LED_out <= "0111000"; -- F end case; end process; -- 7-segment display controller -- generate refresh period of 10.5ms process(clock_100Mhz,reset) begin if(reset='1') then refresh_counter <= (others => '0'); elsif(rising_edge(clock_100Mhz)) then refresh_counter <= refresh_counter + 1; end if; end process; LED_activating_counter <= refresh_counter(19 downto 18); -- 4-to-1 MUX to generate anode activating signals for 4 LEDs process(LED_activating_counter) begin case LED_activating_counter is when "00" => Anode_Activate <= "0111"; -- activate LED1 and Deactivate LED2, LED3, LED4 LED_BCD <= displayed_number(15 downto 12); -- the first hex digit of the 16-bit number when "01" => Anode_Activate <= "1011"; -- activate LED2 and Deactivate LED1, LED3, LED4 LED_BCD <= displayed_number(11 downto 8); -- the second hex digit of the 16-bit number when "10" => Anode_Activate <= "1101"; -- activate LED3 and Deactivate LED2, LED1, LED4 LED_BCD <= displayed_number(7 downto 4); -- the third hex digit of the 16-bit number when "11" => Anode_Activate <= "1110"; -- activate LED4 and Deactivate LED2, LED3, LED1 LED_BCD <= displayed_number(3 downto 0); -- the fourth hex digit of the 16-bit number end case; end process; -- Counting the number to be displayed on 4-digit 7-segment Display -- on Basys 3 FPGA board process(clock_100Mhz, reset) begin if(reset='1') then one_second_counter <= (others => '0'); elsif(rising_edge(clock_100Mhz)) then if(one_second_counter>=x"5F5E0FF") then one_second_counter <= (others => '0'); else one_second_counter <= one_second_counter + "0000001"; end if; end if; end process; one_second_enable <= '1' when one_second_counter=x"5F5E0FF" else '0'; process(clock_100Mhz, reset) begin if(reset='1') then displayed_number <= (others => '0'); elsif(rising_edge(clock_100Mhz)) then if(one_second_enable='1') then displayed_number <= displayed_number + x"0001"; end if; end if; end process; end Behavioral;