30. PWM with 4-bit Resolution

How do you plan to solve it?

module pwm4_basic ( pwm_out, clk, rst, duty);

    input clk,rst;
    input[3:0] duty;
    output reg pwm_out;

    reg[3:0] cnt;
    always @(posedge clk) begin

        cnt<= 4'b0;
        pwm_out<= 1'b0;

        if(rst) begin
            cnt<=0;
            pwm_out<=0;
        end

        else begin
            cnt<=cnt+1;
            if(cnt<duty) begin
                pwm_out<=1;
            end

            else begin
                pwm_out<=0;
            end
        
        end
    end

endmodule