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Altera_Forum's avatar
Altera_Forum
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15 years ago

How to disable all unused LEDs and 7 segment display on DE2 board?

Hi,

I am using Altera DE2 board. For pin assignments, I only use four red LEDs on the board. After I program .sof file by selecting Tool > Programmer from Menu bar, there are others LEDs are blinking. Same as 7 segment display.

How to disable all unused LEDs and 7 segment display?

Thanks!

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Hi,terasic,

    Thanks for the reply.

    Here is the attachment of my project.

    I use verilog code to for 32 bits up counter.

    I connect some 4 bits from 32 bits up counter to a 4 bits of 2:1 mux, and the 2:1 mux outputs connect to 4 leds.

    I dont do anything for 7 segment display.

    thanks!
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    If you go to your project navigator (top right corner) of your Quartus project, right click on the name of the FPGA -> Device and pin options ->Unused pins. Does it say As tri-stated with weak pull up, otherwise your LEDs might be floating?

  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    Hi, Thormodo!

    Thanks for reply. For the Device and Pin Options settings, I have set it as tri-stated. But the unused LEDs keep blinking. May I know how to solve this problem? Any hardware coding or setting i need to do beside the device and pin options?
  • Altera_Forum's avatar
    Altera_Forum
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    15 years ago

    --- Quote Start ---

    you might just want to assign led[7:5] = 0;

    and all HEX(seven seg displays) values to 1 since they are active-low.

    --- Quote End ---

    Well if he's not using the LEDs, they shouldn't have a pin assignment. So he can't set them to 0. Ofcourse you can try to make these assignments and see if that works.