30. PWM with 4-bit Resolution

How do you plan to solve it?

/*Write your code here*/
module pwm4_basic(clk,rst,duty,pwm_out);
input clk,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?4'd0:(cnt+4'd1);
end
endmodule