78 lines
2.7 KiB
Verilog
78 lines
2.7 KiB
Verilog
module top(input clk_pin, input btn_pin, output [7:0] led_pin, output gpio0_pin);
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wire clk;
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wire [7:0] led;
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wire btn;
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wire gpio0;
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(* LOC="G2" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("INPUT")) clk_buf (.B(clk_pin), .O(clk));
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(* LOC="R1" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("INPUT")) btn_buf (.B(btn_pin), .O(btn));
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(* LOC="B2" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) led_buf_0 (.B(led_pin[0]), .I(led[0]));
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(* LOC="C2" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) led_buf_1 (.B(led_pin[1]), .I(led[1]));
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(* LOC="C1" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) led_buf_2 (.B(led_pin[2]), .I(led[2]));
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(* LOC="D2" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) led_buf_3 (.B(led_pin[3]), .I(led[3]));
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(* LOC="D1" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) led_buf_4 (.B(led_pin[4]), .I(led[4]));
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(* LOC="E2" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) led_buf_5 (.B(led_pin[5]), .I(led[5]));
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(* LOC="E1" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) led_buf_6 (.B(led_pin[6]), .I(led[6]));
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(* LOC="H3" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) led_buf_7 (.B(led_pin[7]), .I(led[7]));
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(* LOC="L2" *) (* IO_TYPE="LVCMOS33" *)
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TRELLIS_IO #(.DIR("OUTPUT")) gpio0_buf (.B(gpio0_pin), .I(gpio0));
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localparam ctr_width = 24;
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localparam ctr_max = 2**ctr_width - 1;
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reg [ctr_width-1:0] ctr = 0;
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reg [9:0] pwm_ctr = 0;
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reg dir = 0;
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always@(posedge clk) begin
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ctr <= btn ? ctr : (dir ? ctr - 1'b1 : ctr + 1'b1);
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if (ctr[ctr_width-1 : ctr_width-3] == 0 && dir == 1)
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dir <= 1'b0;
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else if (ctr[ctr_width-1 : ctr_width-3] == 7 && dir == 0)
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dir <= 1'b1;
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pwm_ctr <= pwm_ctr + 1'b1;
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end
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reg [9:0] brightness [0:7];
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localparam bright_max = 2**10 - 1;
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reg [7:0] led_reg;
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genvar i;
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generate
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for (i = 0; i < 8; i=i+1) begin
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always @ (posedge clk) begin
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if (ctr[ctr_width-1 : ctr_width-3] == i)
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brightness[i] <= bright_max;
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else if (ctr[ctr_width-1 : ctr_width-3] == (i - 1))
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brightness[i] <= ctr[ctr_width-4:ctr_width-13];
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else if (ctr[ctr_width-1 : ctr_width-3] == (i + 1))
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brightness[i] <= bright_max - ctr[ctr_width-4:ctr_width-13];
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else
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brightness[i] <= 0;
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led_reg[i] <= pwm_ctr < brightness[i];
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end
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end
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endgenerate
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assign led = led_reg;
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// Tie GPIO0, keep board from rebooting
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assign gpio0 = 1'b1;
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endmodule
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