8 localparam ctr_width = 24;
9 localparam ctr_max = 2**ctr_width - 1;
10 reg [ctr_width-1:0] ctr = 0;
11 reg [9:0] pwm_ctr = 0;
15 always@(posedge clk) begin
16 ctr <= dir ? ctr - 1'b1 - btn: ctr + 1'b1 + btn;
17 if (ctr[ctr_width-1 : ctr_width-3] == 0 && dir == 1)
19 else if (ctr[ctr_width-1 : ctr_width-3] == 7 && dir == 0)
21 pwm_ctr <= pwm_ctr + 1'b1;
24 reg [9:0] brightness [0:7];
25 localparam bright_max = 2**10 - 1;
30 for (i = 0; i < 8; i=i+1) begin
31 always @ (posedge clk) begin
32 if (ctr[ctr_width-1 : ctr_width-3] == i)
33 brightness[i] <= bright_max;
34 else if (ctr[ctr_width-1 : ctr_width-3] == (i - 1))
35 brightness[i] <= ctr[ctr_width-4:ctr_width-13];
36 else if (ctr[ctr_width-1 : ctr_width-3] == (i + 1))
37 brightness[i] <= bright_max - ctr[ctr_width-4:ctr_width-13];
40 led_reg[i] <= pwm_ctr < brightness[i];
45 // assign led = led_reg;
46 assign green_led_d7 = led_reg[0];
47 assign orange_led_d8 = led_reg[1];
48 assign red_led_d5 = led_reg[2];
49 assign yellow_led_d6 = led_reg[3];