30. PWM with 4-bit Resolution

How do you plan to solve it?

/*Write your code here*/
module pwm4_basic(
    input clk,
    input rst,
    input [3:0]duty,
    output reg pwm_out
);
reg [3:0]cnt;
always@(posedge clk) begin
 pwm_out<=rst ? 1'b0: (cnt<duty);
 cnt<= rst? 1'b0: (cnt+4'd1);
end
endmodule