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PO[verilog]Activating LED with Pmod_KYPD combination
 

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  1. PO[verilog]Activating LED with Pmod_KYPD combination
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    <p>I'm using a <a href="https://www.digilentinc.com/Products/Detail.cfm?NavPath=2,401,940&amp;Prod=PMODKYPD" rel="nofollow">Pmod_KYPD</a> connected to a <a href="http://www.digilentinc.com/Products/Detail.cfm?Prod=NEXYS2" rel="nofollow">Digilent FPGA</a>.</p> <p>My purpose is to activate the first LED on the board after the combination '123' is entered in to the keypad.</p> <p>I've downloaded the <a href="https://www.digilentinc.com/Data/Products/PMOD-KPD/PmodKYPD_ISE_Demo.zip" rel="nofollow">demo code</a> of the keypad from Digilent which works fine and it basically displays whatever pressed on from the keypad on to the 7-segment display.</p> <p>The demo code is composed of two parts, which are decode and display. I've modified the display code(only the second 'always' statement is my addition) like the following with a statement machine:</p> <pre><code>`timescale 1ns / 1ps ////////////////////////////////////////////////////////////////////////////////////////////////////////// // Company: Digilent Inc 2011 // Engineer: Michelle Yu // Josh Sackos // Create Date: 07/23/2012 // // Module Name: DisplayController // Project Name: PmodKYPD_Demo // Target Devices: Nexys3 // Tool versions: Xilinx ISE 14.1 // Description: This file defines a DisplayController that controls the seven segment display that works with // the output of the Decoder. // // Revision History: // Revision 0.01 - File Created (Michelle Yu) // Revision 0.02 - Converted from VHDL to Verilog (Josh Sackos) ////////////////////////////////////////////////////////////////////////////////////////////////////////// // ============================================================================================== // Define Module // ============================================================================================== module DisplayController( DispVal, anode, segOut, led, clk, reset ); input clk; input reset; // ============================================================================================== // Additional Declarations // ============================================================================================== output reg [7:0] led; reg [1:0] state; // ============================================================================================== // Port Declarations // ============================================================================================== input [3:0] DispVal; // Output from the Decoder output [3:0] anode; // Controls the display digits output [6:0] segOut; // Controls which digit to display // ============================================================================================== // Parameters, Regsiters, and Wires // ============================================================================================== // Output wires and registers wire [3:0] anode; reg [6:0] segOut; // ============================================================================================== // Implementation // ============================================================================================== // only display the rightmost digit assign anode = 4'b1110; //------------------------------ // Segment Decoder // Determines cathode pattern // to display digit on SSD //------------------------------ always @(DispVal) begin case (DispVal) 4'h0 : segOut &lt;= 7'b1000000; // 0 4'h1 : segOut &lt;= 7'b1111001; // 1 4'h2 : segOut &lt;= 7'b0100100; // 2 4'h3 : segOut &lt;= 7'b0110000; // 3 4'h4 : segOut &lt;= 7'b0011001; // 4 4'h5 : segOut &lt;= 7'b0010010; // 5 4'h6 : segOut &lt;= 7'b0000010; // 6 4'h7 : segOut &lt;= 7'b1111000; // 7 4'h8 : segOut &lt;= 7'b0000000; // 8 4'h9 : segOut &lt;= 7'b0010000; // 9 4'hA : segOut &lt;= 7'b0001000; // A 4'hB : segOut &lt;= 7'b0000011; // B 4'hC : segOut &lt;= 7'b1000110; // C 4'hD : segOut &lt;= 7'b0100001; // D 4'hE : segOut &lt;= 7'b0000110; // E 4'hF : segOut &lt;= 7'b0001110; // F default : segOut &lt;= 7'b0111111; endcase end always @(posedge clk) begin if(reset) begin led &lt;= 8'b11111111; state &lt;= 0; end else begin case (state) 2'b00: begin if(DispVal == 1) begin state &lt;= state + 1; end //led &lt;= 8'b10000000; end 2'b01: begin if(DispVal == 2) begin state &lt;= state + 1; end else state &lt;= 0; //led &lt;= 8'b00000010; end 2'b10: begin if(DispVal == 3) begin state &lt;= state + 1; end else state &lt;= 0; //led &lt;= 8'b00000100; end 2'b11: begin led &lt;= 8'b11111111; end default: led &lt;= 0; endcase end end endmodule </code></pre> <p>But my modification is not working unfortunately. If I enter '123' from the keypad, the LED simply doesn't get activated.</p> <p>What should I change in my modification?</p> <p>Thanks. :)</p>
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