paddles.v

presets/verilog/paddles.v

@@ -0,0 +1,51 @@
+`include "hvsync_generator.v"
+
+module top(clk, reset, hsync, vsync, hpaddle, vpaddle, rgb);
+
+  input clk, reset;
+  input hpaddle, vpaddle;
+  output hsync, vsync;
+  output [2:0] rgb;
+  wire display_on;
+  wire [8:0] hpos;
+  wire [8:0] vpos;
+
+  reg [7:0] player_x;
+  reg [7:0] player_y;
+  
+  reg [7:0] paddle_x;
+  reg [7:0] paddle_y;
+
+  // read horizontal paddle
+  always @(posedge hpaddle)
+    paddle_x <= vpos[7:0];
+
+  // read vertical paddle
+  always @(posedge vpaddle)
+    paddle_y <= vpos[7:0];
+
+  // update player_x and player_y
+  always @(posedge vsync)
+    begin
+      player_x <= paddle_x;
+      player_y <= paddle_y;
+    end
+
+  hvsync_generator hvsync_gen(
+    .clk(clk),
+    .reset(reset),
+    .hsync(hsync),
+    .vsync(vsync),
+    .display_on(display_on),
+    .hpos(hpos),
+    .vpos(vpos)
+  );
+  
+  // display paddle positions on screen
+  
+  wire h = hpos[7:0] >= paddle_x;
+  wire v = vpos[7:0] >= paddle_y;
+
+  assign rgb = {1'b0, display_on && h, display_on && v};
+
+endmodule

presets/verilog/sprite_scanline_renderer.v

@@ -76,7 +76,7 @@ module sprite_scanline_renderer(clk, reset, hpos, vpos, rgb,
   reg [7:0] out_attr;
 
   // which sprite are we currently reading?
-  wire [NB-1:0] load_index = hpos[NB+1:2];
+  wire [NB-1:0] load_index = hpos[NB:1];
 
   // RGB dual scanline buffer
   reg [3:0] scanline[0:511];  
@@ -105,20 +105,18 @@ module sprite_scanline_renderer(clk, reset, hpos, vpos, rgb,
       // load sprites from RAM on line 260
       // 8 cycles per sprite
       // do first sprite twice b/c CPU might still be busy
-      if (vpos == 260 && hpos < N*4+8) begin
+      if (vpos == 260 && hpos < N*2+8) begin
         ram_busy <= 1;
-        case (hpos[1:0])
+        case (hpos[0])
           0: begin
             ram_addr <= {load_index, 1'b0};
-          end
-          1: begin
-            ram_addr <= {load_index, 1'b1};
-          end
-          2: begin
+            // load X and Y position (2 cycles ago)
             sprite_xpos[load_index] <= ram_data[7:0];
             sprite_ypos[load_index] <= ram_data[15:8];
           end
-          3: begin
+          1: begin
+            ram_addr <= {load_index, 1'b1};
+            // load attribute (2 cycles ago)
             sprite_attr[load_index] <= ram_data[7:0];
           end
         endcase

src/platform/verilog.js

@@ -9,16 +9,17 @@ var VERILOG_PRESETS = [
   {id:'scoreboard.v', name:'Scoreboard'},
   {id:'ball_absolute.v', name:'Ball Motion (absolute position)'},
   {id:'ball_slip_counter.v', name:'Ball Motion (slipping counter)'},
+  {id:'paddles.v', name:'Paddle Inputs'},
   {id:'ball_paddle.v', name:'Brick Smash Game'},
   {id:'ram1.v', name:'RAM Text Display'},
   {id:'sprite_bitmap.v', name:'Sprite Bitmaps'},
   {id:'sprite_renderer.v', name:'Sprite Rendering'},
+  {id:'racing_game.v', name:'Racing Game'},
   {id:'sprite_rotation.v', name:'Sprite Rotation'},
   {id:'tank.v', name:'Tank Game'},
   {id:'sound_generator.v', name:'Sound Generator'},
   {id:'lfsr.v', name:'Linear Feedback Shift Register'},
   {id:'starfield.v', name:'Scrolling Starfield'},
-  {id:'racing_game.v', name:'Racing Game'},
   {id:'cpu8.v', name:'Simple 8-Bit CPU'},
   {id:'racing_game_cpu.v', name:'Racing Game with CPU'},
   {id:'framebuffer.v', name:'Frame Buffer'},