Move fillscreen to a separate moduleHEADmaster

Signed-off-by: Warrick Lo <wlo@warricklo.net>

1 files changed, 35 insertions, 15 deletions

diff --git a/task3/task3.sv b/task3/task3.sv
index ddb4e9a..c40f464 100644
--- a/task3/task3.sv
+++ b/task3/task3.sv
@@ -11,26 +11,46 @@ module task3(CLOCK_50, KEY, SW, LEDR, HEX0, HEX1, HEX2, HEX3, HEX4, HEX5,
 	output logic [7:0] VGA_X, VGA_R, VGA_G, VGA_B;
 	output logic [9:0] LEDR;
 
-	logic resetn, start, done;
-	logic [2:0] colour;
-	logic [6:0] center_y;
-	logic [7:0] center_x, radius;
-
-	assign resetn = KEY[3];
-	assign start = ~KEY[0];
-	assign colour = 3'b010;
-	assign LEDR[0] = done;
-
-	assign center_x = 8'd80;
-	assign center_y = 7'd60;
-	assign radius = SW[7:0];
+	logic resetn, done, fillscreen_start, circle_start,
+		fillscreen_done, circle_done, fillscreen_plot, circle_plot;
+	logic [2:0] fillscreen_colour, circle_colour;
+	logic [6:0] fillscreen_y, circle_y;
+	logic [7:0] fillscreen_x, circle_x;
 
 	vga_adapter #(.RESOLUTION("160x120")) U0(resetn, CLOCK_50,
 		VGA_COLOUR, VGA_X, VGA_Y, VGA_PLOT,
 		{VGA_R, 2'b00}, {VGA_G, 2'b00}, {VGA_B, 2'b00},
 		VGA_HS, VGA_VS, VGA_BLANK, VGA_SYNC, VGA_CLK);
 
-	circle U1(CLOCK_50, resetn, colour, center_x, center_y, radius,
-		start, done, VGA_X, VGA_Y, VGA_COLOUR, VGA_PLOT);
+	fillscreen U1(CLOCK_50, resetn, 3'b000, fillscreen_start,
+		fillscreen_done, fillscreen_vga_x, fillscreen_vga_y,
+		fillscreen_colour, fillscreen_plot);
+
+	circle U2(CLOCK_50, resetn, 3'b010, 8'd80, 7'd60, 8'd40,
+		circle_start, circle_done, circle_x, circle_y,
+		circle_colour, circle_plot);
+
+	assign resetn = KEY[3];
+	assign start = ~KEY[0];
+	assign LEDR[0] = done;
+
+	assign VGA_X = fillscreen_start ? fillscreen_vga_x : circle_x;
+	assign VGA_Y = fillscreen_start ? fillscreen_vga_y : circle_y;
+	assign VGA_COLOUR = fillscreen_start ? fillscreen_colour : circle_colour;
+	assign VGA_PLOT = fillscreen_start ? fillscreen_plot : circle_plot;
+
+	always_ff @(posedge CLOCK_50) begin
+		if (~resetn) begin
+			fillscreen_start <= 1'b0;
+			circle_start <= 1'b1;
+			done <= 1'b0;
+		end else if (fillscreen_done) begin
+			fillscreen_start <= 1'b0;
+			circle_start <= 1'b1;
+		end else if (circle_done) begin
+			circle_start <= 1'b0;
+			done <= 1'b1;
+		end
+	end
 
 endmodule: task3