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[/] [wb_lcd/] [trunk/] [verilog/] [wb_lcd_ramless/] [boards/] [s3esk-mm_lcd/] [rtl/] [system.v] - Rev 2
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////////////////////////////////////////////////////////////////////// //// //// //// system.v //// //// //// //// This file is part of: //// //// WISHBONE/MEM MAPPED CONTROLLER FOR LCD CHARACTER DISPLAYS //// //// http://www.opencores.org/projects/wb_lcd/ //// //// //// //// Description //// //// - Memory mapped controller testbench implementation for //// //// Spartan 3E Starter Kit (XC3S500E) board from Digilent. //// //// To Do: //// //// - nothing really //// //// //// //// Author(s): //// //// - José Ignacio Villar, jose@dte.us.es , jvillar@gmail.com //// //// - Grupo ID2 http://www.dte.us.es/id2/ //// //// //// ////////////////////////////////////////////////////////////////////// //// //// //// Copyright (C) 2009 José Ignacio Villar - jvillar@gmail.com //// //// //// //// This source file may be used and distributed without //// //// restriction provided that this copyright statement is not //// //// removed from the file and that any derivative work contains //// //// the original copyright notice and the associated disclaimer. //// //// //// //// This source file is free software; you can redistribute it //// //// and/or modify it under the terms of the GNU Lesser General //// //// Public License as published by the Free Software Foundation; //// //// either version 3 of the License, or (at your option) any //// //// later version. //// //// //// //// This source is distributed in the hope that it will be //// //// useful, but WITHOUT ANY WARRANTY; without even the implied //// //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// //// PURPOSE. See the GNU Lesser General Public License for more //// //// details. //// //// //// //// You should have received a copy of the GNU Lesser General //// //// Public License along with this source; if not, download it //// //// from http://www.gnu.org/licenses/lgpl.txt //// //// //// ////////////////////////////////////////////////////////////////////// `include "lcd_defines.v" module system( input clk, input reset, input [2:0] rot, output [3:0] SF_D, output LCD_E, output LCD_RS, output LCD_RW, output SF_CE0, output reg [7:0] led ); //---------------------------------------------------------------------------- // rotary decoder //---------------------------------------------------------------------------- wire rot_btn; wire rot_event; wire rot_left; rotary rotdec0 ( .clk( clk ), .reset( reset ), .rot( rot ), // output .rot_btn( rot_btn ), .rot_event( rot_event ), .rot_left( rot_left ) ); //---------------------------------------------------------------------------- // LCD Display //---------------------------------------------------------------------------- wire busy; reg repaint = 0; reg [`DAT_RNG] dat = 8'b00100000; reg [`ADDR_RNG] addr = 0; reg we = 0; lcd lcd( .clk ( clk ), .reset ( reset), .dat ( dat ), .addr ( addr ), .we ( we ), .repaint ( repaint ), .busy ( busy ), .SF_D ( SF_D ), .LCD_E ( LCD_E ), .LCD_RS ( LCD_RS ), .LCD_RW ( LCD_RW ) ); //---------------------------------------------------------------------------- // Behavioural description //---------------------------------------------------------------------------- assign SF_CE0 = 1'b1; // disable intel strataflash // Handles "start displaying character" shift reg [`DAT_RNG] start_dat = 8'b00100000; // Handles transfers to the display integer i = 0; always @(posedge clk) begin if(reset) begin i <= 0; repaint <= 0; we <= 1; addr <= 0; dat <= start_dat; led <= 8'b00100000; start_dat <= 8'b00100000; end if (i < 104) begin i <= i + 1; repaint <= 0; we <= 1'b1; addr <= addr + 1; dat <= dat + 1; end if (i == 104 && !busy) begin i <= i + 1; repaint <= 1; we <= 1'b0; end if (i == 105) begin i <= i + 1; repaint <= 0; we <= 1'b0; end else if (rot_event && rot_left && !busy) begin i <= 0; led <= led - 1; start_dat <= start_dat - 1; addr <= 0; repaint <= 0; we <= 1'b1; dat <= start_dat - 1; end else if (rot_event && !busy) begin i <= 0; led <= led + 1; start_dat <= start_dat + 1; addr <= 0; repaint <= 0; we <= 1'b1; dat <= start_dat + 1; end end endmodule