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//==================================================================//
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// File: sub_UserLines.v //
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// Version: 0.0.0.1 //
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// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -//
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// Copyright (C) Stephen Pickett //
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// Jun 08, 2005 //
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// //
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// This program is free software; you can redistribute it and/or //
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// modify it under the terms of the GNU General Public License //
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// as published by the Free Software Foundation; either version 2 //
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// of the License, or (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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// If you have not received a copy of the GNU General Public License//
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// along with this program; write to: //
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// Free Software Foundation, Inc., //
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// 51 Franklin Street, Fifth Floor, //
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// Boston, MA 02110-1301, USA. //
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// //
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//------------------------------------------------------------------//
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// Revisions: //
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// Ver 0.0.0.1 Jun 08, 2005 Under Development //
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// //
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//==================================================================//
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module sub_UserLines(
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MASTER_CLK, MASTER_RST,
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LINE_VALUE_OUT,
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BUTTON_RISE, BUTTON_FALL,
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XCOORD, YCOORD, RESET_VALUE,
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LEFT, RGHT, BOT, TOP,
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SETXnY
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);
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//==================================================================//
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// DEFINITIONS //
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//==================================================================//
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//==================================================================//
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// VARIABLE DEFINITIONS //
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//==================================================================//
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//----------------------//
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// INPUTS / OUTPUTS //
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//----------------------//
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input MASTER_CLK; // global master clock
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input MASTER_RST; // global master reset
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input XCOORD, YCOORD; // X and Y coordinates of the current mouse
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// position. See the documentation for details
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input LEFT, RGHT; // Left and Right limits for 'InRange'
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input TOP, BOT; // Top and Bottom limits for 'InRange'
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input SETXnY; // Upon trigger, either set the 'Value' to the
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// X or Y coord.
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input BUTTON_RISE; // Trigger has risen
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input BUTTON_FALL; // Trigger has fallen
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output[9:0] LINE_VALUE_OUT; // a 10 bit register to store the X or Y value
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input[9:0] RESET_VALUE; // Reset value
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//----------------------//
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// NODES //
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//----------------------//
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wire MASTER_CLK, MASTER_RST;
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wire[9:0] XCOORD, YCOORD, RESET_VALUE;
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wire[9:0] LEFT, RGHT, TOP, BOT;
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wire SETXnY;
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wire BUTTON_RISE, BUTTON_FALL;
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reg[9:0] LINE_VALUE_OUT;
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//==================================================================//
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// T E S T I N G //
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//==================================================================//
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// NOTHING TO TEST
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//==================================================================//
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// FUNCTIONAL DEFINITIONS //
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//==================================================================//
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wire in_range;
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reg drag;
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assign in_range = (((YCOORD >= BOT) && (YCOORD <= TOP)) && ((XCOORD >= LEFT && XCOORD <= RGHT)));
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// the 'DRAG' state machine
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always @ (posedge MASTER_CLK or posedge MASTER_RST) begin
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if(MASTER_RST)
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drag <= 1'b0;
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else if(BUTTON_RISE && in_range)
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drag <= 1'b1;
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else if(BUTTON_FALL)
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drag <= 1'b0;
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else
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drag <= drag;
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end
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/*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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Until this is figured out, it is bad to have the lines at 'zero'
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(due to the comparison for 'in range')
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*/
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always @ (posedge MASTER_CLK or posedge MASTER_RST) begin
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if(MASTER_RST)
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LINE_VALUE_OUT <= RESET_VALUE;
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else if(drag && SETXnY)
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LINE_VALUE_OUT <= XCOORD;
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else if(drag && !SETXnY && (YCOORD<=10'd400))
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LINE_VALUE_OUT <= YCOORD;
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else
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LINE_VALUE_OUT <= LINE_VALUE_OUT;
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end
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endmodule
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