Engineering Homework Help
Engineering Homework Help. I need help with Verilog and basys3 board
I am writing a code about vending machine using verilog and basys 3 board, I wrote the code but it is not working correctly, can someone help editing it?
This is my code:
`timescale 1ns / 1ps
module VendingMachine(input clk,
input btnC,
input [7:0] coin,
input cancel,
output [3:0] an,
output reg [7:0] change,
output reg [6:0] seg);
//coin: 00=0cents, 01=nikel(5cents), 10:dime(10cents), 11=quarter(25cents)
//change: 0000 0101=nickel,
//0000 1010=dime,
//0001 1001=quarter,
//0000 1111=nickel&dime,
//0001 0100=dime&dime
//states declaration
parameter idle = 4’b0000; //state0 = 0
parameter FiveC = 4’b0001; //state1 = 5 cents
parameter TenC = 4’b0010; //state2 = 10 cents
parameter FifteenC = 4’b0011; //state3 = 15 cents
parameter TwentyC = 4’b0100; //state4 = 20 cents
parameter TwentyFiveC = 4’b0101; //state5 = 25 cents
parameter ThirtyC = 4’b0110; //state6 = 30 cents
parameter ThirtyFiveC = 4’b0111; //state7 = 35 cents
parameter FourtyC = 4’b1000; //state8 = 40 cents
parameter FourtyFiveC = 4’b1001; //state9 = 45 cents
reg [3:0] CState;
reg [3:0] NState;
reg [10:0] waitingTime;
//state register sequential logic
always @(posedge clk)
begin
if(btnC == 1)
begin
CState <= 0;
NState <= 0;
change <= 0;
seg <= 7’b1000000;
end
else
begin
CState <= NState;
end
end
always @(coin)
begin
NState <= 0; //initialay zero
CState <= NState;
case(CState)
idle: if(coin == 2’b00) //0 C
begin
NState <= idle;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= FiveC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= TenC;
seg <= 7’b1000000;
change <= 2’b10;
end
else if(coin==2’b11)
begin
NState <= TwentyFiveC;
seg <= 7’b1000000;
change <= 2’b11;
end
FiveC: if(coin== 2’b00) // 5 Cents
begin
NState <= FiveC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= TenC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= FifteenC;
seg <= 7’b1000000;
change <= 2’b10;
end
else if(coin==2’b11)
begin
NState <= ThirtyC;
seg <= 7’b1000000;
change <= 2’b11;
end
TenC: if(coin== 2’b00) // 10 Cents
begin
NState <= TenC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= FifteenC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= TwentyC;
seg <= 7’b1000000;
change <= 2’b10;
end
else if(coin==2’b11)
begin
NState <= ThirtyFiveC;
seg <= 7’b1000000;
change <= 2’b11;
end
FifteenC: if(coin== 2’b00) //15 Cents
begin
NState <= FifteenC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= TwentyC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= TwentyFiveC;
seg <= 7’b1000000;
change <= 2’b10;
end
else if(coin==2’b11)
begin
NState <= FourtyC;
seg <= 7’b1000000;
change <= 2’b11;
end
TwentyC: if(coin==2’b00) // twenty Cents
begin
NState <= TwentyC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= TwentyFiveC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= ThirtyC;
seg <= 7’b1000000;
change <= 2’b10;
end
else if(coin==2’b11)
begin
NState <= FourtyFiveC;
seg <= 7’b1000000;
change <= 2’b11;
end
TwentyFiveC: if(coin==0) // TwentyFive Cents
begin
NState <= TwentyFiveC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= ThirtyC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= ThirtyFiveC;
seg <= 7’b1000000;
change <= 2’b10;
end
else if(coin==2’b11)
begin
NState <= idle; //reaches 50 cents, dispense a soda and goes back to first state
seg = 7’b1111001;
change <= 2’b11;
end
ThirtyC: if(coin== 2’b00)
begin
NState <= ThirtyC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= ThirtyFiveC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= FourtyC;
seg <= 7’b1000000;
change <= 2’b10;
end
else if(coin==2’b11)
begin
NState <= idle; //reaches 55cents, goes back to reset
seg <= 7’b1111001;
change <= 7’b00000101; //returns a nikel
end
ThirtyFiveC: if(coin==2’b00) // ThirtyFive Cents
begin
NState <= ThirtyFiveC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= FourtyC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= FourtyFiveC;
seg <= 7’b1000000;
change <= 2’b10;
end
else if(coin==2’b11)
begin
NState <= idle; //reaches 60cents, dispense a gum and gives a dime change back
seg <= 7’b1111001;
change <= 7’b00001010; //returns a dime
end
FourtyC: if(coin==2’b00) // Fourty Cents
begin
NState <= FourtyC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= FourtyFiveC;
seg <= 7’b1000000;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= idle; //reaches 50cents, dispenses chips, goese back to reset
seg <= 7’b1111001;
change <= 2’b00;
end
else if(coin==2’b11)
begin
NState <= idle; //reaches 65cents, dispense a candy, goes back to reset
seg <= 7’b1111001;
change <= 2’b11; //returns a nikel & a dime
end
FourtyFiveC: if(coin== 2’b00) // Fourt Five Cents
begin
NState <= FourtyFiveC;
seg <= 7’b1000000;
change <= 2’b00;
end
else if(coin==2’b01)
begin
NState <= idle; //reached 50cents, dispense a lolliypop
seg <= 7’b1111001;
change <= 2’b01;
end
else if(coin==2’b10)
begin
NState <= idle; //reaches 55cents, goes back to reset
seg <= 7’b1111001;
change <= 7’b0000101; //change is a nikel
end
else if(coin==2’b11)
begin
//nState <= S10;
NState <= idle; //reaches 70cents, goes back to reset
seg <= 7’b1111001;
change <= 7’b0010100; //returns a dime & a dime
end
default: NState <= idle;
endcase
end
assign an = 4’b1110;
// integer i;
// always @ (waitingTime) begin
// for ( i=0; i <=waitingTime; i=i+1) begin
// if ( i == waitingTime ) begin
// seg <= 7’b1111111;
// end
// end
// if (cancel == 1)
// begin
// NState <= idle;
// end
//end
endmodule
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