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PmodKYPD.v
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`timescale 1ns / 1ps
// ==============================================================================================
// Define Module
// ==============================================================================================
module PmodKYPD(
clk,
JB,
an,
seg
);
// ==============================================================================================
// Port Declarations
// ==============================================================================================
input clk; // 100Mhz onboard clock
inout [7:0] JB; // Port JB on Basys3, JB[3:0] is Columns, JB[10:7] is rows
output [3:0] an; // Anodes on seven segment display
output [6:0] seg; // Cathodes on seven segment display
// ==============================================================================================
// Parameters, Regsiters, and Wires
// ==============================================================================================
// Output wires
wire [3:0] an;
wire [6:0] seg;
wire [3:0] Decode;
//Intermediate Parameters
reg [3:0] solvestate = 4'b0000;
reg [31:0] counter = 0;
// ==============================================================================================
// Implementation
// ==============================================================================================
//-----------------------------------------------
// Decoder
//-----------------------------------------------
Decoder C0(
.clk(clk),
.Row(JB[7:4]),
.Col(JB[3:0]),
.DecodeOut(Decode)
); //runs code to decode input from 16 button keypad
always @(posedge clk) begin//create slower clock for updating the solvestate at a lower sampling frequency
if (counter < 32'h007FFFFF)
begin
counter <= counter +1;
end
else if (counter == 32'h007FFFFF)//only update solvestate on a specific interval defined by the counter
begin
counter <= 0;
//passcode arbitrarily set to: 71B8
if (solvestate == 4'b0000)//if solvestate is 0, check for a button press of 7 to send solvestate to 1. otherwise, maintain solvestate = 0.
begin
case (Decode)
4'h0 : solvestate <= 4'b0000; // 0
4'h1 : solvestate <= 4'b0000; // 1
4'h2 : solvestate <= 4'b0000; // 2
4'h3 : solvestate <= 4'b0000; // 3
4'h4 : solvestate <= 4'b0000; // 4
4'h5 : solvestate <= 4'b0000; // 5
4'h6 : solvestate <= 4'b0000; // 6
4'h7 : solvestate <= 4'b0001; // 7
4'h8 : solvestate <= 4'b0000; // 8
4'h9 : solvestate <= 4'b0000; // 9
4'hA : solvestate <= 4'b0000; // A
4'hB : solvestate <= 4'b0000; // B
4'hC : solvestate <= 4'b0000; // C
4'hD : solvestate <= 4'b0000; // D
4'hE : solvestate <= 4'b0000; // E
4'hF : solvestate <= 4'b0000; // F
default : solvestate <= 4'b0000;
endcase
end
else if (solvestate == 4'b0001)//if solvestate is 1, check for a button press of 1 to send solvestate to 2.
//if button 7 is bouncing, maintain state at solvestate = 1. if any other button is pressed, send solvestate back to 0.
begin
case (Decode)
4'h0 : solvestate <= 4'b0000; // 0
4'h1 : solvestate <= 4'b0010; // 1
4'h2 : solvestate <= 4'b0000; // 2
4'h3 : solvestate <= 4'b0000; // 3
4'h4 : solvestate <= 4'b0000; // 4
4'h5 : solvestate <= 4'b0000; // 5
4'h6 : solvestate <= 4'b0000; // 6
4'h7 : solvestate <= 4'b0001; // 7
4'h8 : solvestate <= 4'b0000; // 8
4'h9 : solvestate <= 4'b0000; // 9
4'hA : solvestate <= 4'b0000; // A
4'hB : solvestate <= 4'b0000; // B
4'hC : solvestate <= 4'b0000; // C
4'hD : solvestate <= 4'b0000; // D
4'hE : solvestate <= 4'b0000; // E
4'hF : solvestate <= 4'b0000; // F
default : solvestate <= 4'b0001;
endcase
end
else if (solvestate == 4'b0010)//if solvestate is 2, check for a button press of B to send solvestate to 3.
//if button 1 is bouncing, maintain state at solvestate = 2. if any other button is pressed, send solvestate back to 0.
begin
case (Decode)
4'h0 : solvestate <= 4'b0000; // 0
4'h1 : solvestate <= 4'b0010; // 1
4'h2 : solvestate <= 4'b0000; // 2
4'h3 : solvestate <= 4'b0000; // 3
4'h4 : solvestate <= 4'b0000; // 4
4'h5 : solvestate <= 4'b0000; // 5
4'h6 : solvestate <= 4'b0000; // 6
4'h7 : solvestate <= 4'b0000; // 7
4'h8 : solvestate <= 4'b0000; // 8
4'h9 : solvestate <= 4'b0000; // 9
4'hA : solvestate <= 4'b0000; // A
4'hB : solvestate <= 4'b0011; // B
4'hC : solvestate <= 4'b0000; // C
4'hD : solvestate <= 4'b0000; // D
4'hE : solvestate <= 4'b0000; // E
4'hF : solvestate <= 4'b0000; // F
default : solvestate <= 4'b0010;
endcase
end
else if (solvestate == 4'b0011)//if solvestate is 3, check for a button press of 8 to send solvestate to 4.
//if button B is bouncing, maintain state at solvestate = 3. if any other button is pressed, send solvestate back to 0.
begin
case (Decode)
4'h0 : solvestate <= 4'b0000; // 0
4'h1 : solvestate <= 4'b0000; // 1
4'h2 : solvestate <= 4'b0000; // 2
4'h3 : solvestate <= 4'b0000; // 3
4'h4 : solvestate <= 4'b0000; // 4
4'h5 : solvestate <= 4'b0000; // 5
4'h6 : solvestate <= 4'b0000; // 6
4'h7 : solvestate <= 4'b0000; // 7
4'h8 : solvestate <= 4'b0100; // 8
4'h9 : solvestate <= 4'b0000; // 9
4'hA : solvestate <= 4'b0000; // A
4'hB : solvestate <= 4'b0011; // B
4'hC : solvestate <= 4'b0000; // C
4'hD : solvestate <= 4'b0000; // D
4'hE : solvestate <= 4'b0000; // E
4'hF : solvestate <= 4'b0000; // F
default : solvestate <= 4'b0011;
endcase
end
else if (solvestate == 4'b0100)//if solvestate is 4, maintain solvestate value if button 8 is bouncing.
//if any other button is pressed, send solvestate back to 0.
begin
case (Decode)
4'h0 : solvestate <= 4'b0000; // 0
4'h1 : solvestate <= 4'b0000; // 1
4'h2 : solvestate <= 4'b0000; // 2
4'h3 : solvestate <= 4'b0000; // 3
4'h4 : solvestate <= 4'b0000; // 4
4'h5 : solvestate <= 4'b0000; // 5
4'h6 : solvestate <= 4'b0000; // 6
4'h7 : solvestate <= 4'b0000; // 7
4'h8 : solvestate <= 4'b0100; // 8
4'h9 : solvestate <= 4'b0000; // 9
4'hA : solvestate <= 4'b0000; // A
4'hB : solvestate <= 4'b0000; // B
4'hC : solvestate <= 4'b0000; // C
4'hD : solvestate <= 4'b0000; // D
4'hE : solvestate <= 4'b0000; // E
4'hF : solvestate <= 4'b0000; // F
default : solvestate <= 4'b0100;
endcase
end
end
end
//-----------------------------------------------
// Seven Segment Display Controller
//-----------------------------------------------
DisplayController C1(
.DispVal(solvestate),
.anode(an),
.segOut(seg)
);//runs code to display solvestate on the 7 segment display.
endmodule