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button_counter.v
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button_counter.v
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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 15:10:10 10/30/2018
// Design Name:
// Module Name: button_counter
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module button_counter
#(parameter N=4)(
input clk,rst_neg,but_up,but_down,
output [N-1:0] b_counter
);
reg [N-1:0] cnt_reg,cnt_next;
localparam [1:0]
no_but=2'b00,
but_dn_press=2'b01,
but_up_press=2'b10
;
assign b_counter=cnt_reg;
reg [2:0] but_state_reg,but_state_next;
always @ (posedge clk or negedge rst_neg)
begin
if(~rst_neg)
begin
cnt_reg<=0;
but_state_reg<=no_but;
end
else
begin
cnt_reg<=cnt_next;
but_state_reg<=but_state_next;
end
end
always @*
begin
but_state_next=but_state_reg;
cnt_next=cnt_reg;
case(but_state_reg)
no_but:
begin
if(but_down)
but_state_next=but_dn_press;
else if(but_up)
but_state_next=but_up_press;
end
but_dn_press:
begin
if(~but_down)
begin
but_state_next=no_but;
cnt_next=cnt_reg-1;
end
end
but_up_press:
begin
if(~but_up)
begin
but_state_next=no_but;
cnt_next=cnt_reg+1;
end
end
endcase
end
endmodule