Forum Discussion

imarz1's avatar
imarz1
Icon for New Contributor rankNew Contributor
7 years ago

I have simple code question

Hi: I am very beginner. I wrote very simple code for DE10-Nano board to turn on one LED, but it is not working. Maybe someone could help: module LED ( CLK_50, LED1 ); input CLK_50; output r...
AnandRaj_S_Intel's avatar
AnandRaj_S_Intel
Icon for Regular Contributor rankRegular Contributor
7 years ago

Hi,

  1. Check your Pin assignments.
  2. Check you code in modelsim (@* includes all the inputs used in block) or debug using signal tap.
  3. You have used smaller counter value, the led is toggling at 125 Hz because of which we can't see it.
  4. Try to toggle the led at less than 40 Hz.

Or just use switch and led to start with.

module LED
(
	input SW,
	output LED
);
 
	assign LED= SW;
 
endmodule

Let me know if this has helped resolve the issue you are facing or if you need any further assistance.

Regards

Anand

imarz1's avatar
imarz1
Icon for New Contributor rankNew Contributor
7 years ago

Hi:

I can turn ON LED by: LED1 <= 1;

Also, the CLK_50 is set to pin_V11.

So, probably it is not pin assignment issue.

The problem seems to be when creating time delay before turning ON the LED... I am unable to create any time delay.

For example the following delays did not work:

1- if(counter == 200000)

2- for (i = 0; i < 500; i = i +1) : Here i found out I can't have more than 500 iteration in FOR loop ? Not sure if this is verilog restriction or Quartus issue.

3- repeat(500) : Here too, I can't have more than 500 iteration ? Same, not sure if this is verilog restriction or Quartus issue.

In all these three cases the LED turns ON immediately. The delays were nothing, even though I looped many "repeat(500)" within the For loop.

Remember, I am very beginner, so I might have made a rookie mistake somewhere...

Thanks.