User`s manual

345 ///////////////////////////////////////////////////////////////////////////////////////////////////

346 wire btn_up_clean, btn_down_clean, btn_left_clean, btn_right_clean;

347 wire btn_up_sw, btn_down_sw, btn_left_sw, btn_right_sw;

348 debounce btn_up_debounce(.reset(reset), .clock(clock_27mhz), .noisy(button_up), .clean(btn_up_clean));

349 debounce btn_down_debounce(.reset(reset), .clock(clock_27mhz), .noisy(button_down), .clean(btn_down_clean));

350 debounce btn_left_debounce(.reset(reset), .clock(clock_27mhz), .noisy(button_left), .clean(btn_left_clean));

351 debounce btn_right_debounce(.reset(reset), .clock(clock_27mhz), .noisy(button_right), .clean(btn_right_clean));

352 assign btn_up_sw = ~btn_up_clean;

353 assign btn_down_sw = ~btn_down_clean;

354 assign btn_left_sw = ~btn_left_clean;

355 assign btn_right_sw = ~btn_right_clean;

356

357

358 ///////////////////////////////////////////////////////////////////////////////////////////////////

359 // create switches

360 ///////////////////////////////////////////////////////////////////////////////////////////////////

361 wire override_sw;

362 wire[1:0] quad_corner_sw;

363 assign override_sw = switch[7];

364 assign quad_corner_sw = switch[1:0];

365

366 ///////////////////////////////////////////////////////////////////////////////////////////////////

367 // instantiate vga

368 ///////////////////////////////////////////////////////////////////////////////////////////////////

369 wire[9:0] hcount;

370 wire[9:0] vcount;

371 wire vsync, hsync, blank;

372 vga vga(.vclock(vga_clk),

373 .hcount(hcount),

374 .vcount(vcount),

375 .vsync(vsync),

376 .hsync(hsync),

377 .blank(blank));

378

379 reg old_btn_up, old_btn_down, old_btn_left, old_btn_right;

380 always @(posedge vsync) begin

381 old_btn_up <= btn_up_sw;

382 old_btn_down <= btn_down_sw;

383 old_btn_left <= btn_left_sw;

384 old_btn_right <= btn_right_sw;

385 end

386

387

388 ///////////////////////////////////////////////////////////////////////////////////////////////////

389 // instantiate accel_lut and move_cursor

390 // essentially, corners of quadrilateral logic