module pwm_c(clk,value,PWM_out,counter);
input clk;
input [3:0] value;
output PWM_out;
reg PWM_out;

output reg [3:0]counter;

parameter rst=1;

always@(posedge clk)
    begin
        if(!rst)
            counter <= 4'd0;
        else
            counter <= counter + 4'd1;
    end

always@(counter or value)
    begin
        if(value == 4'd0)
            PWM_out = 1'b0;
        else if(value == 4'd1)
            PWM_out = (counter >=4'd1) ? 1'b0:1'b1;
        else if(value == 4'd2)
            PWM_out = (counter >=4'd2) ? 1'b0:1'b1;
        else if(value == 4'd3)
            PWM_out = (counter >= 4'd3) ? 1'b0:1'b1;
        else if(value == 4'd4)
            PWM_out = (counter >= 4'd4) ? 1'b0:1'b1;

        else if(value == 4'd5)
            PWM_out = (counter >= 4'd5) ? 1'b0:1'b1;
        else if(value == 4'd6)
            PWM_out = (counter >= 4'd6) ? 1'b0:1'b1;
        else if(value == 4'd7)
            PWM_out = (counter >= 4'd7) ? 1'b0:1'b1;
        else if(value == 4'd8)
            PWM_out = (counter >= 4'd8) ? 1'b0:1'b1;


        else if(value == 4'd9)
            PWM_out = (counter >= 4'd9) ? 1'b0:1'b1;
        else if(value == 4'd10)
            PWM_out = (counter >= 4'd10) ? 1'b0:1'b1;
        else if(value == 4'd11)
            PWM_out = (counter >= 4'd11) ? 1'b0:1'b1;
        else if(value == 4'd12)
            PWM_out = (counter >= 4'd12) ? 1'b0:1'b1;

        else if(value == 4'd13)
            PWM_out = (counter >= 4'd13) ? 1'b0:1'b1;
        else if(value == 4'd14)
            PWM_out = (counter >= 4'd14) ? 1'b0:1'b1;
        else if(value == 4'd15)
            PWM_out = (counter >= 4'd15) ? 1'b0:1'b1;


        else
            PWM_out = 1'b0;
    end

endmodule