Altera_Forum
Honored Contributor
Honored ContributorQuartus 2 Analysis + Synthesis Takes Too Long
Hi all,
I'm creating an 8-bit game for a university comp sci assignment (so, I have a good amount of programming experience, but not with hardware description languages) using a Cyclone 2, Quartus 2, and verilog and I'm having some real difficulty with the compile time. My program consists of 3 modules: a VGADriver (which takes input from the frame_buffer and displays it on screen), a controller driver (which polls a gamepad and sends the results to controller_buffer), and a gameplay module (shown below). It normally takes 1.5-2 minutes to compile, but when I add the following lines of code to the gameplay module, it takes over an hour, and it runs out of memory before it finishes compiling:
if((controller_buffer) && (player_1_pos > 0)) begin
player_1_pos = player_1_pos - 1;
end
if((controller_buffer) && (player_1_pos < (frame_line_size - (player_1_length * 2)))) begin
player_1_pos = player_1_pos + 1;
end
module Gameplay (
input clk,
output reg frame_buffer,
input controller_buffer
);
//constants for the controller buttons
parameter num_buttons = 8;
parameter LEFTPAD = 5;
parameter RIGHTPAD = 7;
//frame buffer size constants
parameter frame_buffer_size = 3600;
parameter frame_line_size = 120;
parameter colour_depth = 3;
parameter RED_INDEX = 0;
parameter BLUE_INDEX = 1;
parameter GREEN_INDEX = 2;
parameter BLACK = 3'b000;
parameter GREEN = 3'b100;
//player 1 position constants
parameter player_1_length = 7;
parameter player_1_height = 4;
parameter player_1_start_x = ((frame_line_size/colour_depth)/2) - (player_1_length/2);
parameter player_1_y = 0;
reg player_1_pos;
reg poll_count;
initial begin
//initialize the frame buffer to all black
frame_buffer = 0;
player_1_pos = player_1_start_x;
poll_count = 0;
end
always @(negedge clk) begin
//poll the controller for button pressed every million clock cycles
poll_count = poll_count + 1;
if(poll_count >= 1000000) begin
draw_player_1_pos;
poll_count = 0;
end
end
//re-draws player 1 on the screen based on D-pad button inputs and the current position of player 1
task draw_player_1_pos;
begin
draw_player_1(player_1_pos, player_1_y, BLACK);
//HERE'S WHERE THE PROBLEM BEGINS
if((controller_buffer) && (player_1_pos > 0)) begin
player_1_pos = player_1_pos - 1;
end
if((controller_buffer) && (player_1_pos < (frame_line_size - (player_1_length * 2)))) begin
player_1_pos = player_1_pos + 1;
end
//HERE'S WHERE THE PROBLEM ENDS
draw_player_1(player_1_pos, player_1_y, GREEN);
end
endtask
//draws player 1 on the screen
task draw_player_1;
input x;
input y;
input colour;
begin
set_pixel(x + 3, y, colour);
set_pixel(x + 2, y + 1, colour);
set_pixel(x + 3, y + 1, colour);
set_pixel(x + 4, y + 1, colour);
set_pixel(x, y + 2, colour);
set_pixel(x + 1, y + 2, colour);
set_pixel(x + 2, y + 2, colour);
set_pixel(x + 3, y + 2, colour);
set_pixel(x + 4, y + 2, colour);
set_pixel(x + 5, y + 2, colour);
set_pixel(x + 6, y + 2, colour);
set_pixel(x, y + 3, colour);
set_pixel(x + 1, y + 3, colour);
set_pixel(x + 2, y + 3, colour);
set_pixel(x + 3, y + 3, colour);
set_pixel(x + 4, y + 3, colour);
set_pixel(x + 5, y + 3, colour);
set_pixel(x + 6, y + 3, colour);
end
endtask
//display a pixel on the screen when given an x coordinate, y coordinate, and colour for the pixel
task set_pixel;
input x_coordinate;
input y_coordinate;
input colour;
reg pixel_pos;
begin
pixel_pos = ((((frame_buffer_size/frame_line_size) - y_coordinate) * frame_line_size) - (x_coordinate * colour_depth)) - 1;
frame_buffer = colour;
frame_buffer = colour;
frame_buffer = colour;
end
endtask
endmodule
