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keyboard.v
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// ZX Spectrum for Altera DE1
//
// Copyright (c) 2009-2011 Mike Stirling
//
// 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 VIC-20 matrix conversion
module keyboard
(
input reset,
input clk_sys,
input ps2_kbd_clk,
input ps2_kbd_data,
input [64:0] c64_keys,
input [7:0] col_in,
output [7:0] row_out,
input [7:0] row_in,
output [7:0] col_out,
output reg [11:1] Fn = 0,
output reg [2:0] mod = 0
);
reg [3:0] prev_clk = 0;
reg [11:0] sreg = 'hFFF;
wire[11:0] kdata = {ps2_kbd_data,sreg[11:1]};
wire [7:0] kcode = kdata[9:2];
reg [7:0] keys[7:0];
reg [7:0] keys_comb[7:0];
reg release_btn = 0;
always @(posedge clk_sys) begin
keys_comb[0] <= keys[0] & {c64_keys[0],c64_keys[6:1],c64_keys[7]};
keys_comb[1] <= keys[1] & {c64_keys[8],c64_keys[14:9],c64_keys[15]};
keys_comb[2] <= keys[2] & {c64_keys[16],c64_keys[22:17],c64_keys[23]};
keys_comb[3] <= keys[3] & {c64_keys[56],c64_keys[62:57],c64_keys[63]};
keys_comb[4] <= keys[4] & {c64_keys[32],c64_keys[38:33],c64_keys[39]};
keys_comb[5] <= keys[5] & {c64_keys[40],c64_keys[46:41],c64_keys[47]};
keys_comb[6] <= keys[6] & {c64_keys[48],c64_keys[54:49],c64_keys[55]};
keys_comb[7] <= keys[7] & {c64_keys[24],c64_keys[30:25],c64_keys[31]};
end
assign row_out = ({8{col_in[0]}} & ~keys_comb[0]) |
({8{col_in[1]}} & ~keys_comb[1]) |
({8{col_in[2]}} & ~keys_comb[2]) |
({8{col_in[3]}} & ~keys_comb[3]) |
({8{col_in[4]}} & ~keys_comb[4]) |
({8{col_in[5]}} & ~keys_comb[5]) |
({8{col_in[6]}} & ~keys_comb[6]) |
({8{col_in[7]}} & ~keys_comb[7]);
assign col_out = ({8{row_in[0]}} & {~keys_comb[7][0], ~keys_comb[6][0], ~keys_comb[5][0], ~keys_comb[4][0], ~keys_comb[3][0], ~keys_comb[2][0], ~keys_comb[1][0], ~keys_comb[0][0]}) |
({8{row_in[1]}} & {~keys_comb[7][1], ~keys_comb[6][1], ~keys_comb[5][1], ~keys_comb[4][1], ~keys_comb[3][1], ~keys_comb[2][1], ~keys_comb[1][1], ~keys_comb[0][1]}) |
({8{row_in[2]}} & {~keys_comb[7][2], ~keys_comb[6][2], ~keys_comb[5][2], ~keys_comb[4][2], ~keys_comb[3][2], ~keys_comb[2][2], ~keys_comb[1][2], ~keys_comb[0][2]}) |
({8{row_in[3]}} & {~keys_comb[7][3], ~keys_comb[6][3], ~keys_comb[5][3], ~keys_comb[4][3], ~keys_comb[3][3], ~keys_comb[2][3], ~keys_comb[1][3], ~keys_comb[0][3]}) |
({8{row_in[4]}} & {~keys_comb[7][4], ~keys_comb[6][4], ~keys_comb[5][4], ~keys_comb[4][4], ~keys_comb[3][4], ~keys_comb[2][4], ~keys_comb[1][4], ~keys_comb[0][4]}) |
({8{row_in[5]}} & {~keys_comb[7][5], ~keys_comb[6][5], ~keys_comb[5][5], ~keys_comb[4][5], ~keys_comb[3][5], ~keys_comb[2][5], ~keys_comb[1][5], ~keys_comb[0][5]}) |
({8{row_in[6]}} & {~keys_comb[7][6], ~keys_comb[6][6], ~keys_comb[5][6], ~keys_comb[4][6], ~keys_comb[3][6], ~keys_comb[2][6], ~keys_comb[1][6], ~keys_comb[0][6]}) |
({8{row_in[7]}} & {~keys_comb[7][7], ~keys_comb[6][7], ~keys_comb[5][7], ~keys_comb[4][7], ~keys_comb[3][7], ~keys_comb[2][7], ~keys_comb[1][7], ~keys_comb[0][7]});
always @(posedge clk_sys) begin
reg old_reset = 0, old_sw;
old_sw <= mod[2] & mod[0];
old_reset <= reset;
if((~old_reset & reset) | (~old_sw & mod[2] & mod[0]))begin
prev_clk<= 0;
sreg <= 'hFFF;
keys[0] <= 'hFF;
keys[1] <= 'hFF;
keys[2] <= 'hFF;
keys[3] <= 'hFF;
keys[4] <= 'hFF;
keys[5] <= 'hFF;
keys[6] <= 'hFF;
keys[7] <= 'hFF;
end else begin
prev_clk <= {ps2_kbd_clk,prev_clk[3:1]};
if(prev_clk == 1) begin
if (kdata[11] & ^kdata[10:2] & ~kdata[1] & kdata[0]) begin
sreg <= 'hFFF;
if(kcode == 8'he0) ;
else if (kcode == 8'hf0) release_btn <= 1;
else begin
release_btn <= 0;
case(kcode)
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(kcode)
8'h16 : keys[0][0] <= release_btn; // 1
8'h26 : keys[0][1] <= release_btn; // 3
8'h2e : keys[0][2] <= release_btn; // 5
8'h3d : keys[0][3] <= release_btn; // 7
8'h46 : keys[0][4] <= release_btn; // 9
8'h4e : keys[0][5] <= release_btn; // +
8'h70 : keys[0][6] <= release_btn; // BP
8'h66 : keys[0][7] <= release_btn; // DEL
8'h0e : keys[1][0] <= release_btn; // LEFT
8'h1d : keys[1][1] <= release_btn; // W
8'h2d : keys[1][2] <= release_btn; // R
8'h35 : keys[1][3] <= release_btn; // Y
8'h43 : keys[1][4] <= release_btn; // I
8'h4d : keys[1][5] <= release_btn; // P
8'h5b : keys[1][6] <= release_btn; // *
8'h5a : keys[1][7] <= release_btn; // RET
8'h14 : keys[2][0] <= release_btn; // CTL
8'h1c : keys[2][1] <= release_btn; // A
8'h23 : keys[2][2] <= release_btn; // D
8'h34 : keys[2][3] <= release_btn; // G
8'h3b : keys[2][4] <= release_btn; // J
8'h4b : keys[2][5] <= release_btn; // L
8'h52 : keys[2][6] <= release_btn; // ;
8'h74 : keys[2][7] <= release_btn; // RIGHT
8'h76 : keys[3][0] <= release_btn; // RUN/STOP (ESC)
8'h12 : keys[3][1] <= release_btn; // LEFT SHIFT
8'h22 : keys[3][2] <= release_btn; // X
8'h2a : keys[3][3] <= release_btn; // V
8'h31 : keys[3][4] <= release_btn; // N
8'h41 : keys[3][5] <= release_btn; // ,
8'h4a : keys[3][6] <= release_btn; // /
8'h72 : keys[3][7] <= release_btn; // DOWN
8'h29 : keys[4][0] <= release_btn; // SPC
8'h1a : keys[4][1] <= release_btn; // Z
8'h21 : keys[4][2] <= release_btn; // C
8'h32 : keys[4][3] <= release_btn; // B
8'h3a : keys[4][4] <= release_btn; // M
8'h49 : keys[4][5] <= release_btn; // .
8'h59 : keys[4][6] <= release_btn; // RIGHT SHIFT
8'h05 : keys[4][7] <= release_btn; // F1
8'h11 : keys[5][0] <= release_btn; // CBM (ALT)
8'h1b : keys[5][1] <= release_btn; // S
8'h2b : keys[5][2] <= release_btn; // F
8'h33 : keys[5][3] <= release_btn; // H
8'h42 : keys[5][4] <= release_btn; // K
8'h4c : keys[5][5] <= release_btn; // :
8'h5d : keys[5][6] <= release_btn; // =
8'h04 : keys[5][7] <= release_btn; // F3
8'h15 : keys[6][0] <= release_btn; // Q
8'h24 : keys[6][1] <= release_btn; // E
8'h2c : keys[6][2] <= release_btn; // T
8'h3c : keys[6][3] <= release_btn; // U
8'h44 : keys[6][4] <= release_btn; // O
8'h54 : keys[6][5] <= release_btn; // @
8'h7a : keys[6][6] <= release_btn; // UP
8'h03 : keys[6][7] <= release_btn; // F5
8'h1e : keys[7][0] <= release_btn; // 2
8'h25 : keys[7][1] <= release_btn; // 4
8'h36 : keys[7][2] <= release_btn; // 6
8'h3e : keys[7][3] <= release_btn; // 8
8'h45 : keys[7][4] <= release_btn; // 0
8'h55 : keys[7][5] <= release_btn; // -
8'h6c : keys[7][6] <= release_btn; // HOM
8'h83 : keys[7][7] <= release_btn; // F7
8'h6b: begin //Cursor Left
keys[2][7] <= release_btn;
keys[4][6] <= release_btn;
end
8'h75: begin //Cursor Up
keys[3][7] <= release_btn;
keys[4][6] <= release_btn;
end
endcase
end
end else begin
sreg <= kdata;
end
end
end
end
endmodule