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Forum: FPGA, VHDL & Verilog RE: I was wondering where I went wrong


RE: I was wondering where I went wrong
von Joseph J. (earthkid123)

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module display (clock, AN0, AN1, AN2, AN3, CA, CB, CC, CD, CE, CF, CG, CDP);

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//USED FOR SEVEN SEG

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input clock;

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output AN0, AN1, AN2, AN3, CA, CB, CC, CD, CE, CF, CG, CDP;

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reg [7:0] cathodedata; //cathode data

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reg [3:0] anodedata; //anode data

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reg [2:0] digit = 1;

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reg [6:0] data;

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reg setdp;

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reg [19:0] counter = 0;

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assign CA = cathodedata [7];

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assign CB = cathodedata [6];

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assign CC = cathodedata [5];

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assign CD = cathodedata [4];

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assign CE = cathodedata [3];

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assign CF = cathodedata [2];

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assign CG = cathodedata [1];

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assign CDP = cathodedata [0];

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assign AN3 = anodedata [3];

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assign AN2 = anodedata [2];

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assign AN1 = anodedata [1];

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assign AN0 = anodedata [0];

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//USED FOR SEVEN SEG

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    //Multiplexing

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    //Board Clock: 50MHz

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    //p = t*f

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    //t = 16ms

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    //p = 16ms * 50*10^6 = 800,000 cycles

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    //200,000 cycles for each digit

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    //Refreshed every 16ms (~60Hz)

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always@(negedge clock)

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begin

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    if (digit == 1)

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        begin

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            if (counter == 200000)

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                begin

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                    digit = 2;

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                end

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            else

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                begin

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                counter = counter + 1;

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                data = 4;

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                end

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        end

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    else if (digit == 2)

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        begin

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            if (counter == 400000)

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                begin

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                    digit = 3;

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                end

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            else

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                begin

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                    counter = counter + 1;

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                    data = 3;

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                end

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        end

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    else if (digit == 3)

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        begin

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            if (counter == 600000)

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                begin

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                    digit = 4;

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                end

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            else

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                begin

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                    counter = counter + 1;

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                    data = 2;

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                end

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        end

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    else if (digit == 4)

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        begin

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            if (counter == 800000)

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                begin

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                    digit = 1;

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                    counter = 0;

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                end 

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            else

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                begin

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                    counter = counter + 1;

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                    data = 1;

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                end

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        end 

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end

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always @ (*)

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begin

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    case (data)

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        6'd0: cathodedata = 8'b00000011; //0

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        6'd1: cathodedata = 8'b10011111; //1

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        6'd2: cathodedata = 8'b00100101; //2

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        6'd3: cathodedata = 8'b00001101; //3

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        6'd4: cathodedata = 8'b10011001; //4

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        6'd5: cathodedata = 8'b01001001; //5

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        6'd6: cathodedata = 8'b01000001; //6

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        6'd7: cathodedata = 8'b00011111; //7

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        6'd8: cathodedata = 8'b00000001; //8

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        6'd9: cathodedata = 8'b00001001; //9

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        6'd10: cathodedata = 8'b00010001; //A

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        6'd11: cathodedata = 8'b11000001; //B

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        6'd12: cathodedata = 8'b01100011; //C

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        6'd13: cathodedata = 8'b10000101; //D

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        6'd14: cathodedata = 8'b00100001; //E

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        6'd15: cathodedata = 8'b01110001; //F

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        default: cathodedata = 8'b11111111; //default all off

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    endcase

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    if (setdp == 1) //decimal point

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        cathodedata = cathodedata & 8'hFE;

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    case(digit)

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        0: anodedata = 4'b1111; //all OFF

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        4: anodedata = 4'b1110; //AN0

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        3: anodedata = 4'b1101; //AN1

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        2: anodedata = 4'b1011; //AN2

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        1: anodedata = 4'b0111; //AN3

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        default:

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        anodedata = 4'b1111; //all OFF

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    endcase

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end 

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endmodule


I am using a Nexys 2 digilent board with Xilinix and I just want to turn 
the seven seg display on as a countdown

  


  



  

  
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    RE: I also have this
  


  

    

      von
      
        Joseph J.
        (earthkid123)
        
      
      


      
    


    

      
    

    

    

  
  


  

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I was wondering in the code what the anode data would be in order to get 
the lights to turn on I am so very confused

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module seven_seg( intput [3:0]numbers, output reg[6:0] display);

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always @(numbers)

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  begin  

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    case(numbers)

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      4'h0: out1=7'b1000000;  //0111111;

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      4'h1:  out1=7'b1111001;  //0000110;

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      4'h2:  out1=7'b0100100;  //1011011;

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      4'h3: out1=7'b0110000;  //1001111;

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      4'h4: out1=7'b0011001;  //1100110;

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      4'h5: out1=7'b0010010;  //1101101;

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      4'h6: out1=7'b0000010;  //1111101;

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      4'h7: out1=7'b1111000;  //0000111;

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      4'h8: out1=7'b0000000;  //1111111;

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      4'h9: out1=7'b0011000;  //1100111;

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       default: out1=7'b1111111;//0000000;

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    endcase

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  end  

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endmodule

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endmodule

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// display numbers*/

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/*

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module Slowclock(input wire clk, output reg clkslowed

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    );

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  integer count=0; 

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  always @(posedge clk)

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    begin 

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      if(count<12500)

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      begin 

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        count=count+1;

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      end 

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      else 

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      begin 

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            clkslowed=!clkslowed;

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            count=0;

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          end

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      end

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endmodule

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//slow down clock speed so you can manipulate the seven seg display */

I just dont know why my lights arent going on I have the nexys 2 board I 
need the countdown to work or seven seg display I need for it to 
countdown from 9 to 0

  


  




  

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    Re: RE: I was wondering where I went wrong
  


  

    

      von
      
        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

  
  


  

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Joseph J. wrote:
> I just want to turn the seven seg display on as a countdown
What did happen instead?
And how did you find that out?

You don't have to start a new THREAD for each post. You can simply 
append new experiences with the edit box at the end oo the thread...

  


  



  

  
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    Re: RE: I was wondering where I went wrong
  


  

    

      von
      
        Joseph (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

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Lothar M. wrote:
> Joseph J. wrote:
> I just want to turn the seven seg display on as a countdown
>
> What did happen instead?
> And how did you find out

 Nothing happened it didn't turn on at all the seven segment. I found 
because it didn't work I don't know where I put the actual lights part 
referenced as A0 in the next part.

  


  




  

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    Re: RE: I was wondering where I went wrong
  


  

    

      von
      
        Joseph Abel (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

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I feel like im messing my user constraints file I am not sure

  


  




  

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    Re: RE: I was wondering where I went wrong
  


  

    

      von
      
        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

  
  


  

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Joseph Abel wrote:
> I feel like im messing my user constraints file I am not sure
What does your simulation look like?
In a behavioral simulation no UCF file is involved. And therefore its 
the best way to start that way.

> I am not sure
What about trying to switch on just some segments on one of the 
digits. That would be a wholy static design without counters and other 
more tricky things.
So: do some small steps and learn by those small steps...

  


  




  

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    Re: RE: I was wondering where I went wrong
  


  

    

      von
      
        Joseph (Guest)
      
      


      
    


    

      
    

    

    

  
  


  

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I simulated it and I still don't see my problem im not sure what the 
error is why my seven segment display isnt working

  


  




  

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    Re: RE: I was wondering where I went wrong
  


  

    

      von
      
        Lothar M.
            (Company: Titel)
        (lkmiller)
        (Moderator)
      
      


      
    


    

      
    

    

    

  
  


  

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Joseph wrote:
> I simulated it
With what result?
Does the behavioral simulation work as expected?

Then something with the implementation on the hardware is wrong. And the 
most significant part to interact with the toolchain is the ucf file. 
There the pin constraints are most important...

  


  




  

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