coffee_moore.v

`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 03/09/2021 09:39:56 AM
// Design Name:
// Module Name: coffee_moore
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////

module coffee_moore(
    input clk,
    input insert,
    input reset,
    input [1:0] coins,
    output reg coffee = 0,
    output reg [2:0] state_display
    );

     localparam state_initial = 3'b000,
                   state_1 = 3'b001,
                   state_2 = 3'b010,
                   state_3 = 3'b011,
                   state_4 = 3'b100;


   reg [2:0] CurrentState = state_initial;
   reg [2:0] NextState = state_initial;
   reg previous_insert = 0;


    always @(*) begin

        if(insert!=previous_insert || reset) begin

        previous_insert <= insert;

        if(insert || reset) begin

           case(CurrentState)
                state_initial: begin
                    if(coins==2'b10) begin NextState = state_1;
                        //coffee <= 1'b0;
                        //state_display <= state_1;
                    end
                    if(coins==2'b01) begin NextState = state_2;
                        //coffee <= 1'b0;
                        //state_display <= state_2;
                    end
                    if(coins==2'b00) begin NextState = state_initial;
                        //coffee <= 1'b0;
                        //state_display <= state_initial;
                    end
                    if(reset) begin NextState = state_initial;
                        //coffee <= 1'b0;
                        //state_display <= state_initial;
                    end
               end


               state_1: begin
                   if(coins==2'b10) begin NextState = state_2;
                       //coffee <= 1'b0;
                       //state_display <= state_2;
                   end
                   if(coins==2'b01) begin NextState = state_3;
                       //coffee <= 1'b1;
                       //state_display <= state_3;
                   end
                   if(coins==2'b00) begin NextState = state_1;
                       //coffee <= 1'b0;
                       //state_display <= state_1;
                   end
                   if(reset) begin NextState = state_initial;
                       //coffee <= 1'b0;
                       //state_display <= state_initial;
                   end
               end


               state_2: begin
                   if(coins==2'b10) begin NextState = state_3;
                       //coffee <= 1'b1;
                       //state_display <= state_3;
                   end
                   if(coins==2'b01) begin NextState = state_4;
                       //coffee <= 1'b1;
                       //state_display <= state_4;
                   end
                   if(coins==2'b00) begin NextState = state_2;
                       //coffee <= 1'b0;
                       //state_display <= state_2;
                   end
                   if(reset) begin NextState = state_initial;
                       //coffee <= 1'b0;
                       //state_display <= state_initial;
                   end
               end


               state_3: begin
                   if(coins==2'b10) begin NextState = state_1;
                       //coffee <= 1'b0;
                       //state_display <= state_1;
                   end
                   if(coins==2'b01) begin NextState = state_2;
                       //coffee <= 1'b0;
                       //state_display <= state_2;
                   end
                   if(coins==2'b00) begin NextState = state_initial;
                       //coffee <= 1'b0;
                       //state_display <= state_initial;
                   end
                   if(reset) begin NextState = state_initial;
                       //coffee <= 1'b0;
                       //state_display <= state_initial;
                   end
               end


               state_4: begin
                   if(coins==2'b10) begin NextState = state_2;
                       //coffee <= 1'b0;
                       //state_display <= state_2;
                   end
                   if(coins==2'b01) begin NextState = state_3;
                       //coffee <= 1'b1;
                       //state_display <= state_3;
                   end
                   if(coins==2'b00) begin NextState = state_1;
                       //coffee <= 1'b0;
                       //state_display <= state_1;
                   end
                   if(reset) begin NextState = state_initial;
                       //coffee <= 1'b0;
                       //state_display <= state_initial;
                   end
               end


               default begin
                   NextState = state_initial;
                   //coffee <= 1'b0;
                   //state_display <= state_initial;
               end

           endcase

           CurrentState = NextState;

        end
        end
        end

    always@(posedge clk) begin
    case(CurrentState)
        state_initial: begin
            state_display <= CurrentState;
            coffee <= 1'b0;
        end
        state_1: begin
            state_display <= CurrentState;
            coffee <= 1'b0;
        end
        state_2: begin
            state_display <= CurrentState;
            coffee <= 1'b0;
        end
        state_3: begin
            state_display <= CurrentState;
            coffee <= 1'b1;
        end
        state_4: begin
            state_display <= CurrentState;
            coffee <= 1'b1;
        end
    endcase
    end

endmodule