arbiter.v

`timescale 1ns / 1ps

module arbiter (
    input wire clk,     // master clock
    input wire rst_button,
    input wire pause_button,
    input wire adj_button,
    input wire sel_button,
  	output wire [3:0] anode_signal,   // for the 7-segment display
  	output wire [6:0] cathode_signal,   // for the 7-segment display
);

// Debounced inputs
wire rst, pause, adj, sel;

// Clocks
wire clk_2hz, clk_1hz, clk_fast, clk_blink;

// Counter outputs
wire [5:0] minutes, seconds;

// state for pause
reg paused;

// Initialize the pause state
initial begin
    paused = 0;
end

// Clock divider module instantiation
clock_divider clk_div (
    .clk(clk),
    .rst(rst),
    .clk_2hz(clk_2hz),
    .clk_1hz(clk_1hz),
    .clk_fast(clk_fast),
    .clk_blink(clk_blink)
);

// Debouncer modules instantiation
debouncer rst_deb (.clk(clk_fast), .button_in(rst_button), .button_out(rst));
debouncer pause_deb (.clk(clk_fast), .button_in(pause_button), .button_out(pause));
debouncer adj_deb (.clk(clk_fast), .switch_in(adj_switch), .switch_out(adj));
debouncer sel_deb (.clk(clk_fast), .switch_in(sel_switch), .switch_out(sel));
  

// Counter module instantiation
counter stopwatch_counter (
    .clk(clk_1hz),
    .reset(rst),
    .pause(paused),
    .adjust(adj),
    .adjust_sel(sel),
    .adjust_clk(clk_2hz),
    .minutes(minutes),
    .seconds(seconds)
);

// Display multiplexer instantiation
display_mux display (
    .clk(clk_fast),
    .minutes(minutes),
    .seconds(seconds),
    .blink_en(adj),
    .blink_clk(clk_blink),
    .an(an),
    .seg(seg),
    .dp(dp)
);

// Handle the pause functionality with a simple state machine
always @(posedge clk_fast) begin
    if (rst) begin
        paused <= 0;
    end else if (pause) begin
        paused <= ~paused;  // Toggle pause state on button press
    end
  	// call the counter here if pause and rst not pressed
end

endmodule