Using 7 segment on De1 Board

But for use it what i must do?

Of course i an output so i can declare it into entity like:

HEX0, HEX1 ........ OUT STD_LOGIC_VECTOR (0 TO 6)

But in architecture? I want for example that the display count how many SW are on if i do the assignment

LEDR <= SW led are on when switch is on but i don't find any assignment for the display can you help me pls?

To count how many '1's ( or '0's ) you may design a majority circuit. This code:

jurado1: process (t1)

variable m1 : unsigned (2 downto 0);

begin

m1:=TO_UNSIGNED(0,3);

for i in 0 to 3 loop

if (t1(i) = '1') then

m1:=m1+1;

end if;

end loop;

count <= m1;

end process jurado1;

count will have the numbers of '1's on vector t1 ( 4 bits ). I don't know how many '1's do want count. For a greater number of switch a sequential counter will be easier.

Of course you have to decode bcd number on count, to 7 segment code. If you count more than 9 '1's you'll need 2 digits, so you need a bin to bcd converter.

I posted an example for the DE1 in this thread:

http://www.alteraforum.com/forum/showthread.php?t=35687

Download the zip file and follow the instructions to build it. It includes code for driving the hex displays.

Cheers,

Dave

Thanks Dave, unfortunately (i know that you already hate me for all stupid problem that i posted on forum :) ) but our teacher impose us to use the 9.1 sp3 version

of Quartus II so when i try to lunch the file synth.tcl the console tell me that my version is older than the version in which you create the project! At the moment i want

to tell you "THANK YOU" for your help and kindly ask you another question then i hope that i ll be able to walk with my leg and start to do some experiment with the board......

consider that on february i must send a project to my teacher.....i am very delay but i have also other 3 exam to prepare! :(

Bertulus wrote on this post that i must create a majority circuit, what is it? It's not possible to work 7 segment display only a VHDL file??

I tried to do a "stupid" experiment for see that the output work like

HEX <= SW

like switch and led but i also now that is 7 segment display is a device completely different than switch and buttons.....can you tell me how i must do for see the component work?

Thanks a lot for your cooperation

Michele

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Thanks Dave, unfortunately (i know that you already hate me for all stupid problem that i posted on forum :) )

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So far your questions have not been stupid, so you're ok :)

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but our teacher impose us to use the 9.1 sp3 version

of Quartus II so when i try to lunch the file synth.tcl the console tell me that my version is older than the version in which you create the project!

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I downloaded the zip and I see that the qwork/ folder was included in the zip. Just delete that folder and try again.

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Bertulus wrote on this post that i must create a majority circuit, what is it? It's not possible to work 7 segment display only a VHDL file??

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Perhaps he misunderstood your request. You just want to be able to use the 7-segment display, right?

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I tried to do a "stupid" experiment for see that the output work like

HEX <= SW

like switch and led but i also now that is 7 segment display is a device completely different than switch and buttons.....can you tell me how i must do for see the component work?

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Each segment in the display is a like LED. If you want to see numbers, then you have to turn on different segments. Look in the VHDL file with the example I posted (hex_display.vhd) and read the comments in there.

Cheers,

Dave

Thanks Dave, now the project work well! I just start to see your code! If i have other problem i post it on forum :)

Yes i want only use the 7 segment display :)

Thanks a lot for your cooperation

Michele

ok now i understand how the 7 segment display work. I try some test like sum HEX0 <= "0000000" + "1" and i saw that the result is not 1 :)

For sum two number into 7 segment display, i must use also clock?

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ok now i understand how the 7 segment display work. I try some test like sum HEX0 <= "0000000" + "1" and i saw that the result is not 1 :)

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Right, because the 7-segment display is just a bunch of LEDs. If you want those LEDs to "mean" numbers, then you have to decode the number, i.e.,

HEX0 <= decode(number);

You could have your code written like this using a function call, or using a hex_display component as shown in the example you downloaded.

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For sum two number into 7 segment display, i must use also clock?

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No, but its generally useful to use a clock.

In the case of your "tests" just output to the hex display the switch settings or the key settings

u4: hex_display
    port map(
        hex     => hex_data_d,
        display => hex_d
    );
-- Drive with the switches
hex_data_d <= sw(3 downto 0);
-- Drive with the push buttons
-- hex_data_d <= key(3 downto 0);

Cheers,

Dave

for assignment a variable to an hardware component, for example an X input with key / sw

is enough do for example:

signal X: KEY[0]