mirror of
https://github.com/marqs85/ossc
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66 lines
2.5 KiB
Verilog
66 lines
2.5 KiB
Verilog
//
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// Copyright (C) 2015-2023 Markus Hiienkari <mhiienka@niksula.hut.fi>
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//
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// This file is part of Open Source Scan Converter project.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//
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module videogen (
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input pclk,
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input [11:0] xpos,
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input [10:0] ypos,
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output reg [7:0] R_out,
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output reg [7:0] G_out,
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output reg [7:0] B_out
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);
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//Parameters for 720x480@59.94Hz (858px x 525lines, pclk 27MHz -> 59.94Hz)
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parameter H_SYNCLEN = 10'd62;
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parameter H_BACKPORCH = 10'd60;
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parameter H_ACTIVE = 10'd720;
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parameter H_FRONTPORCH = 10'd16;
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parameter H_TOTAL = 10'd858;
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parameter V_SYNCLEN = 10'd6;
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parameter V_BACKPORCH = 10'd30;
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parameter V_ACTIVE = 10'd480;
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parameter V_FRONTPORCH = 10'd9;
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parameter V_TOTAL = 10'd525;
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parameter H_OVERSCAN = 10'd40; //at both sides
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parameter V_OVERSCAN = 10'd16; //top and bottom
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parameter H_AREA = 10'd640;
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parameter V_AREA = 10'd448;
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parameter H_GRADIENT = 10'd512;
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parameter V_GRADIENT = 10'd256;
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parameter V_GRAYRAMP = 10'd84;
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parameter H_BORDER = ((H_AREA-H_GRADIENT)>>1);
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parameter V_BORDER = ((V_AREA-V_GRADIENT)>>1);
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// Pattern gen
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always @(posedge pclk)
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begin
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if ((xpos < H_OVERSCAN) || (xpos >= H_OVERSCAN+H_AREA) || (ypos < V_OVERSCAN) || (ypos >= V_OVERSCAN+V_AREA))
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{R_out, G_out, B_out} <= {3{(xpos[0] ^ ypos[0]) ? 8'hff : 8'h00}};
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else if ((xpos < H_OVERSCAN+H_BORDER) || (xpos >= H_OVERSCAN+H_AREA-H_BORDER) || (ypos < V_OVERSCAN+V_BORDER) || (ypos >= V_OVERSCAN+V_AREA-V_BORDER))
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{R_out, G_out, B_out} <= {3{8'h50}};
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else if (ypos >= V_OVERSCAN+V_BORDER+V_GRADIENT-V_GRAYRAMP)
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{R_out, G_out, B_out} <= {3{8'((((xpos - (H_OVERSCAN+H_BORDER)) >> 4) << 3) + (xpos - (H_OVERSCAN+H_BORDER) >> 6))}};
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else
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{R_out, G_out, B_out} <= {3{8'((xpos - (H_OVERSCAN+H_BORDER)) >> 1)}};
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end
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endmodule
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