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keyboard.sv
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keyboard.sv
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// ZX Spectrum for Altera DE1
//
// Copyright (c) 2009-2011 Mike Stirling
// Copyright (c) 2015-2017 Sorgelig
//
// All rights reserved
//
// Redistribution and use in source and synthezised forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in synthesized form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// * Neither the name of the author nor the names of other contributors may
// be used to endorse or promote products derived from this software without
// specific prior written agreement from the author.
//
// * License is granted for non-commercial use only. A fee may not be charged
// for redistributions as source code or in synthesized/hardware form without
// specific prior written agreement from the author.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
// THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// PS/2 scancode to Spectrum matrix conversion
module keyboard
(
input reset,
input clk_sys,
input [10:0] ps2_key,
input [15:0] addr,
output [4:0] key_data,
output reg [11:1] Fn = 0,
output reg [2:0] mod = 0
);
reg [4:0] keys[7:0];
reg release_btn = 0;
reg [7:0] code;
// Output addressed row to ULA
assign key_data = (!addr[8] ? keys[0] : 5'b11111)
&(!addr[9] ? keys[1] : 5'b11111)
&(!addr[10] ? keys[2] : 5'b11111)
&(!addr[11] ? keys[3] : 5'b11111)
&(!addr[12] ? keys[4] : 5'b11111)
&(!addr[13] ? keys[5] : 5'b11111)
&(!addr[14] ? keys[6] : 5'b11111)
&(!addr[15] ? keys[7] : 5'b11111);
reg input_strobe = 0;
wire shift = mod[0];
always @(posedge clk_sys) begin
reg old_reset = 0;
old_reset <= reset;
if(~old_reset & reset)begin
keys[0] <= 5'b11111;
keys[1] <= 5'b11111;
keys[2] <= 5'b11111;
keys[3] <= 5'b11111;
keys[4] <= 5'b11111;
keys[5] <= 5'b11111;
keys[6] <= 5'b11111;
keys[7] <= 5'b11111;
end
if(input_strobe) begin
case(code)
8'h59: mod[0]<= ~release_btn; // right shift
8'h11: mod[1]<= ~release_btn; // alt
8'h14: mod[2]<= ~release_btn; // ctrl
8'h05: Fn[1] <= ~release_btn; // F1
8'h06: Fn[2] <= ~release_btn; // F2
8'h04: Fn[3] <= ~release_btn; // F3
8'h0C: Fn[4] <= ~release_btn; // F4
8'h03: Fn[5] <= ~release_btn; // F5
8'h0B: Fn[6] <= ~release_btn; // F6
8'h83: Fn[7] <= ~release_btn; // F7
8'h0A: Fn[8] <= ~release_btn; // F8
8'h01: Fn[9] <= ~release_btn; // F9
8'h09: Fn[10]<= ~release_btn; // F10
8'h78: Fn[11]<= ~release_btn; // F11
endcase
case(code)
8'h12 : keys[0][0] <= release_btn; // Left shift (CAPS SHIFT)
8'h59 : keys[0][0] <= release_btn; // Right shift (CAPS SHIFT)
8'h1a : keys[0][1] <= release_btn; // Z
8'h22 : keys[0][2] <= release_btn; // X
8'h21 : keys[0][3] <= release_btn; // C
8'h2a : keys[0][4] <= release_btn; // V
8'h1c : keys[1][0] <= release_btn; // A
8'h1b : keys[1][1] <= release_btn; // S
8'h23 : keys[1][2] <= release_btn; // D
8'h2b : keys[1][3] <= release_btn; // F
8'h34 : keys[1][4] <= release_btn; // G
8'h15 : keys[2][0] <= release_btn; // Q
8'h1d : keys[2][1] <= release_btn; // W
8'h24 : keys[2][2] <= release_btn; // E
8'h2d : keys[2][3] <= release_btn; // R
8'h2c : keys[2][4] <= release_btn; // T
8'h16 : keys[3][0] <= release_btn; // 1
8'h1e : keys[3][1] <= release_btn; // 2
8'h26 : keys[3][2] <= release_btn; // 3
8'h25 : keys[3][3] <= release_btn; // 4
8'h2e : keys[3][4] <= release_btn; // 5
8'h45 : keys[4][0] <= release_btn; // 0
8'h46 : keys[4][1] <= release_btn; // 9
8'h3e : keys[4][2] <= release_btn; // 8
8'h3d : keys[4][3] <= release_btn; // 7
8'h36 : keys[4][4] <= release_btn; // 6
8'h4d : keys[5][0] <= release_btn; // P
8'h44 : keys[5][1] <= release_btn; // O
8'h43 : keys[5][2] <= release_btn; // I
8'h3c : keys[5][3] <= release_btn; // U
8'h35 : keys[5][4] <= release_btn; // Y
8'h5a : keys[6][0] <= release_btn; // ENTER
8'h4b : keys[6][1] <= release_btn; // L
8'h42 : keys[6][2] <= release_btn; // K
8'h3b : keys[6][3] <= release_btn; // J
8'h33 : keys[6][4] <= release_btn; // H
8'h29 : keys[7][0] <= release_btn; // SPACE
8'h14 : keys[7][1] <= release_btn; // CTRL (Symbol Shift)
8'h3a : keys[7][2] <= release_btn; // M
8'h31 : keys[7][3] <= release_btn; // N
8'h32 : keys[7][4] <= release_btn; // B
// Cursor keys - these are actually extended (E0 xx), but
// the scancodes for the numeric keypad cursor keys are
// are the same but without the extension, so we'll accept
// the codes whether they are extended or not
8'h6B : begin // Left (CAPS 5)
keys[0][0] <= release_btn;
keys[3][4] <= release_btn;
end
8'h72 : begin // Down (CAPS 6)
keys[0][0] <= release_btn;
keys[4][4] <= release_btn;
end
8'h75 : begin // Up (CAPS 7)
keys[0][0] <= release_btn;
keys[4][3] <= release_btn;
end
8'h74 : begin // Right (CAPS 8)
keys[0][0] <= release_btn;
keys[4][2] <= release_btn;
end
// Other special keys sent to the ULA as key combinations
8'h66 : begin // Backspace (CAPS 0)
keys[0][0] <= release_btn;
keys[4][0] <= release_btn;
end
8'h58 : begin // Caps lock (CAPS 2)
keys[0][0] <= release_btn;
keys[3][1] <= release_btn;
end
8'h76 : begin // Escape (CAPS SPACE)
keys[0][0] <= release_btn;
keys[7][0] <= release_btn;
end
8'h49 : begin // . <
keys[7][1] <= release_btn;
keys[2][4] <= release_btn | ~shift;
keys[7][2] <= release_btn | shift;
end
8'h41 : begin // , >
keys[7][1] <= release_btn;
keys[2][3] <= release_btn | ~shift;
keys[7][3] <= release_btn | shift;
end
8'h4A : begin // / ?
keys[7][1] <= release_btn;
keys[0][3] <= release_btn | ~shift;
keys[0][4] <= release_btn | shift;
end
8'h4C : begin // ; :
keys[7][1] <= release_btn;
keys[0][1] <= release_btn | ~shift;
keys[5][1] <= release_btn | shift;
end
8'h52 : begin // " '
keys[7][1] <= release_btn;
keys[4][3] <= release_btn | ~shift;
keys[5][0] <= release_btn | shift;
end
8'h54 : begin // (
keys[7][1] <= release_btn;
keys[4][2] <= release_btn;
end
8'h5B : begin // )
keys[7][1] <= release_btn;
keys[4][1] <= release_btn;
end
8'h4E : begin // - _
keys[7][1] <= release_btn;
keys[4][0] <= release_btn | ~shift;
keys[6][3] <= release_btn | shift;
end
8'h55 : begin // = +
keys[7][1] <= release_btn;
keys[6][2] <= release_btn | ~shift;
keys[6][1] <= release_btn | shift;
end
8'h0E : begin // '
keys[7][1] <= release_btn;
keys[4][3] <= release_btn;
end
8'h5D : begin // *
keys[7][1] <= release_btn;
keys[7][4] <= release_btn;
end
default: ;
endcase
end
end
reg [8:0] auto[46] = '{
255,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,
{1'b1, 8'h59}, // right shift
{1'b1, 8'h11}, // alt
{1'b1, 8'h14}, // ctrl
{1'b0, 8'h3b}, // J
{1'b1, 8'h3b}, // J
{1'b0, 8'h52}, // "
{1'b1, 8'h52}, // "
0,
{1'b0, 8'h52}, // "
{1'b1, 8'h52}, // "
{1'b0, 8'h5a}, // enter
{1'b1, 8'h5a}, // enter
255
};
always @(posedge clk_sys) begin
integer div;
reg [5:0] auto_pos = 0;
reg old_reset = 0;
reg old_state;
input_strobe <= 0;
old_reset <= reset;
old_state <= ps2_key[10];
if(~old_reset & reset)begin
auto_pos <= 0;
end else begin
if(auto[auto_pos] == 255) begin
div <=0;
if(old_state != ps2_key[10]) begin
release_btn <= ~ps2_key[9];
code <= ps2_key[7:0];
input_strobe <= 1;
if((ps2_key[8:0] == 9) && ~ps2_key[9]) auto_pos <= 1; // F10
end
end else begin
div <= div + 1;
if(div == 7000000) begin
div <=0;
if(auto[auto_pos]) {input_strobe, release_btn, code} <= {1'b1, auto[auto_pos]};
auto_pos <= auto_pos + 1'd1;
end
end
end
end
endmodule