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[/] [s6soc/] [trunk/] [rtl/] [spio.v] - Blame information for rev 51

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1 7 dgisselq
////////////////////////////////////////////////////////////////////////////////
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//
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// Filename:    spio.v
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//
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// Project:     CMod S6 System on a Chip, ZipCPU demonstration project
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//
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// Purpose:     To provide a bare minimum level of access to the two on-board
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//              buttons, the 4 LED's, and the external 4x4 keypad.  This
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//      routine does *nothing* to debounce either buttons or keypad.  Any such
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//      debouncing *must* be done in software.  As with the rest of the S6
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//      project, the goal is to keep the logic small and simple, and this
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//      module is no different.
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//
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//      With the USB cord on top, the board facing you, LED[0] is on the left.
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//
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// Creator:     Dan Gisselquist, Ph.D.
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//              Gisselquist Technology, LLC
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2015-2016, Gisselquist Technology, LLC
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//
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// This program is free software (firmware): you can redistribute it and/or
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// modify it under the terms of  the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or (at
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// 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, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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// for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program.  (It's in the $(ROOT)/doc directory, run make with no
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// target there if the PDF file isn't present.)  If not, see
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// <http://www.gnu.org/licenses/> for a copy.
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//
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// License:     GPL, v3, as defined and found on www.gnu.org,
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//              http://www.gnu.org/licenses/gpl.html
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//
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//
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////////////////////////////////////////////////////////////////////////////////
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//
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//
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46 2 dgisselq
module  spio(i_clk, i_wb_cyc, i_wb_stb, i_wb_we, i_wb_data, o_wb_data,
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        o_kp_col, i_kp_row, i_btn, o_led,
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        o_kp_int, o_btn_int);
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        //
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        input                   i_clk;
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        //
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        input                   i_wb_cyc, i_wb_stb, i_wb_we;
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        input           [31:0]   i_wb_data;
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        output  wire    [31:0]   o_wb_data;
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        //
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        output  reg     [3:0]    o_kp_col;
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        input           [3:0]    i_kp_row;
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        input           [1:0]    i_btn;
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        output  reg     [3:0]    o_led;
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        output  reg             o_kp_int, o_btn_int;
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        initial o_kp_col = 4'h0;
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        initial o_led    = 4'h0;
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        always @(posedge i_clk)
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                if ((i_wb_stb)&&(i_wb_we))
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                begin
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                        o_kp_col <= ((o_kp_col)&(~i_wb_data[11:8]))
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                                        |((i_wb_data[15:12])&(i_wb_data[11:8]));
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                        // o_led <= ((o_led)&(~i_wb_data[7:4]))
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                                        // |((i_wb_data[3:0])&(i_wb_data[7:4]));
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                        o_led[0] <= (i_wb_data[4])?i_wb_data[0]:o_led[0];
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                        o_led[1] <= (i_wb_data[5])?i_wb_data[1]:o_led[1];
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                        o_led[2] <= (i_wb_data[6])?i_wb_data[2]:o_led[2];
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                        o_led[3] <= (i_wb_data[7])?i_wb_data[3]:o_led[3];
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                end
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        reg     [3:0]    x_kp_row, r_kp_row;
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        reg     [1:0]    x_btn, r_btn;
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        initial x_kp_row  = 4'h0;
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        initial r_kp_row  = 4'b0;
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        initial x_btn     = 2'b0;
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        initial r_btn     = 2'b0;
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        initial o_kp_int  = 1'b0;
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        initial o_btn_int = 1'b0;
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        always @(posedge i_clk)
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        begin
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                x_kp_row <= i_kp_row;
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                x_btn    <= i_btn;
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                r_kp_row <= x_kp_row;
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                r_btn    <= x_btn;
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                o_kp_int <= ~(&r_kp_row);
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                o_btn_int <= |(r_btn);
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        end
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        assign  o_wb_data = { 16'h00, o_kp_col, r_kp_row, 2'b00, r_btn, o_led };
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endmodule

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