blob: 7668c5435a6cf76afd857f3b9799dc471ccc7a17 [file] [log] [blame]
`default_nettype none
// Keep I/O fixed for TinyTapeout
module user_module_341063825089364563(
input [7:0] io_in,
output [7:0] io_out
);
parameter COUNTER_WIDTH = 23;
parameter FADE_COUNTER_WIDTH = 22;
parameter FADE_WIDTH = 4;
parameter PWM_COUNTER_WIDTH = 11;
// using io_in[0] as clk, io_in[1] as reset
wire clk;
assign clk = io_in[0];
wire reset;
assign reset = io_in[1];
reg [2:0] counter_speed_prefix;
reg direction;
reg tail;
reg led_invert;
reg [2:0] state;
reg [6:0] led_out;
reg [FADE_WIDTH-1:0] segments [6:0];
reg [COUNTER_WIDTH-1:0] counter; // XXX: What is the clk freq for TT?
wire [FADE_COUNTER_WIDTH-1:0] fade_counter;
wire [4:0] pwm_counter_slice;
wire [COUNTER_WIDTH-1:0] counter_speed;
assign pwm_counter_slice = counter[PWM_COUNTER_WIDTH-4:PWM_COUNTER_WIDTH-4-5];
assign counter_speed = {counter_speed_prefix, {COUNTER_WIDTH-1-3{1'b1}}};
assign fade_counter = counter[FADE_COUNTER_WIDTH-1:0];
assign io_out = {0, led_out} ^ {8{led_invert}};
always @(posedge clk) begin
counter_speed_prefix <= ~io_in[4:2];
tail <= io_in[5];
direction <= io_in[6];
led_invert <= io_in[7];
end
always @(posedge clk) begin
if(reset) begin
counter <= 0;
state <= 0;
led_out <= 8'b00000000;
segments[0] <= {FADE_WIDTH-1{1'b0}};
segments[1] <= {FADE_WIDTH-1{1'b0}};
segments[2] <= {FADE_WIDTH-1{1'b0}};
segments[3] <= {FADE_WIDTH-1{1'b0}};
segments[4] <= {FADE_WIDTH-1{1'b0}};
segments[5] <= {FADE_WIDTH-1{1'b0}};
segments[6] <= {FADE_WIDTH-1{1'b0}};
end else begin
if(counter >= counter_speed) begin
counter <= 0;
if(direction)
state <= state + 3'b001;
else
if(state == 3'b000)
state <= 3'b111;
else
state <= state - 3'b001;
end else begin
counter <= counter + 1;
end
end
led_out[0] <= segments[0] > pwm_counter_slice;
led_out[1] <= segments[1] > pwm_counter_slice;
led_out[2] <= segments[2] > pwm_counter_slice;
led_out[3] <= segments[3] > pwm_counter_slice;
led_out[4] <= segments[4] > pwm_counter_slice;
led_out[5] <= segments[5] > pwm_counter_slice;
led_out[6] <= segments[6] > pwm_counter_slice;
if(tail) begin
if(fade_counter == 0)
begin
segments[0] <= segments[0] >> 1;
segments[1] <= segments[1] >> 1;
segments[2] <= segments[2] >> 1;
segments[3] <= segments[3] >> 1;
segments[4] <= segments[4] >> 1;
segments[5] <= segments[5] >> 1;
segments[6] <= segments[6] >> 1;
end
end else begin
segments[0] <= 4'b0000;
segments[1] <= 4'b0000;
segments[2] <= 4'b0000;
segments[3] <= 4'b0000;
segments[4] <= 4'b0000;
segments[5] <= 4'b0000;
segments[6] <= 4'b0000;
end
case(state)
3'b000 : segments[0] <= {FADE_WIDTH-1{1'b1}};
3'b001 : segments[1] <= {FADE_WIDTH-1{1'b1}};
3'b010 : segments[6] <= {FADE_WIDTH-1{1'b1}};
3'b011 : segments[4] <= {FADE_WIDTH-1{1'b1}};
3'b100 : segments[3] <= {FADE_WIDTH-1{1'b1}};
3'b101 : segments[2] <= {FADE_WIDTH-1{1'b1}};
3'b110 : segments[6] <= {FADE_WIDTH-1{1'b1}};
3'b111 : segments[5] <= {FADE_WIDTH-1{1'b1}};
endcase
end
endmodule