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54 lines
1.1 KiB
Coq
54 lines
1.1 KiB
Coq
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`include "hvsync_generator.v"
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module ball_paddle_top(clk, reset, hsync, vsync, rgb);
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input clk;
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input reset;
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output hsync, vsync;
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output [2:0] rgb;
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wire display_on;
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wire [8:0] hpos;
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wire [8:0] vpos;
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reg [7:0] ball_htimer;
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reg [7:0] ball_vtimer;
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reg [3:0] ball_horiz_vel;
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reg [3:0] ball_vert_vel;
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hvsync_generator hvsync_gen(
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.clk(clk),
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.hsync(hsync),
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.vsync(vsync),
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.display_on(display_on),
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.hpos(hpos),
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.vpos(vpos)
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);
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always @(posedge clk)
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begin
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if (hpos == 0 && vpos == 0)
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ball_htimer <= ball_htimer + 8'(ball_horiz_vel) - 4;
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else if (display_on)
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ball_htimer <= ball_htimer + 1;
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end;
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always @(posedge hsync)
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begin
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if (vpos > 9'(ball_vert_vel))
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ball_vtimer <= ball_vtimer + 1;
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end;
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wire ball_hgfx = ball_htimer < 8;
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wire ball_vgfx = ball_vtimer < 8;
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wire ball_gfx = ball_hgfx & ball_vgfx;
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wire grid_gfx = (((hpos&7)==0) || ((vpos&7)==0));
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wire r = display_on && (grid_gfx | ball_gfx);
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wire g = display_on && ball_gfx;
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wire b = display_on && ball_gfx;
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assign rgb = {b,g,r};
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endmodule
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