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