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c16_keymatrix.v
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c16_keymatrix.v
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`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Copyright 2013-2016 Istvan Hegedus
//
// FPGATED is free software: you can redistribute it and/or 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 your option) any later version.
//
// FPGATED is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// Create Date: 19:38:44 12/16/2015
// Module Name: c16_keymatrix.v
// Project Name: FPGATED
//
// Description: C16/Plus4 keyboard matrix emulation for PS2 keyboards.
//
// Revisions:
// 1.0 first release
//
//////////////////////////////////////////////////////////////////////////////////
module c16_keymatrix(
input clk,
input [7:0] scancode,
input receiveflag,
input [7:0] row,
output [7:0] kbus,
output keyreset
);
reg releaseflag=0;
reg extendedflag=0;
reg [7:0] colsel=0;
reg key_A=0,key_B=0,key_C=0,key_D=0,key_E=0,key_F=0,key_G=0,key_H=0,key_I=0,key_J=0,key_K=0,key_L=0,key_M=0,key_N=0,key_O=0,key_P=0,key_Q=0,key_R=0,key_S=0,key_T=0,key_U=0,key_V=0,key_W=0,key_X=0,key_Y=0,key_Z=0;
reg key_1=0,key_2=0,key_3=0,key_4=0,key_5=0,key_6=0,key_7=0,key_8=0,key_9=0,key_0=0,key_del=0,key_return=0,key_help=0,key_F1=0,key_F2=0,key_F3=0,key_AT=0,key_shift=0,key_comma=0,key_dot=0;
reg key_minus=0,key_colon=0,key_star=0,key_semicolon=0,key_esc=0,key_equal=0,key_plus=0,key_slash=0,key_control=0,key_space=0,key_runstop=0;
reg key_pound=0,key_down=0,key_up=0,key_left=0,key_right=0,key_home=0,key_commodore=0,key_alt=0;
wire [7:0] rowsel;
assign rowsel=~row;
assign keyreset=key_control&key_alt&key_del;
always @(posedge clk)
begin
if(receiveflag)
begin
if(scancode==8'hF0)
releaseflag<=1;
else if (scancode==8'hE0)
extendedflag<=1;
else
begin
releaseflag<=0;
if (~extendedflag) // base code keys
begin
case(scancode)
8'h1C: key_A<=~releaseflag;
8'h32: key_B<=~releaseflag;
8'h21: key_C<=~releaseflag;
8'h23: key_D<=~releaseflag;
8'h24: key_E<=~releaseflag;
8'h2B: key_F<=~releaseflag;
8'h34: key_G<=~releaseflag;
8'h33: key_H<=~releaseflag;
8'h43: key_I<=~releaseflag;
8'h3B: key_J<=~releaseflag;
8'h42: key_K<=~releaseflag;
8'h4B: key_L<=~releaseflag;
8'h3A: key_M<=~releaseflag;
8'h31: key_N<=~releaseflag;
8'h44: key_O<=~releaseflag;
8'h4D: key_P<=~releaseflag;
8'h15: key_Q<=~releaseflag;
8'h2D: key_R<=~releaseflag;
8'h1B: key_S<=~releaseflag;
8'h2C: key_T<=~releaseflag;
8'h3C: key_U<=~releaseflag;
8'h2A: key_V<=~releaseflag;
8'h1D: key_W<=~releaseflag;
8'h22: key_X<=~releaseflag;
8'h35: key_Y<=~releaseflag;
8'h1A: key_Z<=~releaseflag;
8'h69,
8'h16: key_1<=~releaseflag;
8'h72,
8'h1E: key_2<=~releaseflag;
8'h7A,
8'h26: key_3<=~releaseflag;
8'h6B,
8'h25: key_4<=~releaseflag;
8'h73,
8'h2E: key_5<=~releaseflag;
8'h74,
8'h36: key_6<=~releaseflag;
8'h6C,
8'h3D: key_7<=~releaseflag;
8'h75,
8'h3E: key_8<=~releaseflag;
8'h7D,
8'h46: key_9<=~releaseflag;
8'h70,
8'h45: key_0<=~releaseflag;
8'h66: key_del<=~releaseflag;
8'h5A: key_return<=~releaseflag;
8'h0C: key_help<=~releaseflag;
8'h05: key_F1<=~releaseflag;
8'h06: key_F2<=~releaseflag;
8'h04: key_F3<=~releaseflag;
8'h54: key_AT<=~releaseflag;
8'h12,
8'h59: key_shift<=~releaseflag;
8'h41: key_comma<=~releaseflag;
8'h49: key_dot<=~releaseflag;
8'h7B,
8'h4E: key_minus<=~releaseflag;
8'h4C: key_colon<=~releaseflag;
8'h7C,
8'h5B: key_star<=~releaseflag;
8'h52: key_semicolon<=~releaseflag;
8'h76: key_esc<=~releaseflag;
8'h5D: key_equal<=~releaseflag;
8'h79,
8'h55: key_plus<=~releaseflag;
8'h4A: key_slash<=~releaseflag;
8'h14: key_control<=~releaseflag;
8'h29: key_space<=~releaseflag;
8'h0D: key_runstop<=~releaseflag;
8'h11: key_alt<=~releaseflag;
default:;
endcase
end
else begin // extended code keys
extendedflag<=0;
case(scancode)
8'h2F: key_pound<=~releaseflag;
8'h72: key_down<=~releaseflag;
8'h75: key_up<=~releaseflag;
8'h6B: key_left<=~releaseflag;
8'h74: key_right<=~releaseflag;
8'h6C: key_home<=~releaseflag;
8'h14: key_control<=~releaseflag;
8'h1F: key_commodore<=~releaseflag;
8'h4A: key_slash<=~releaseflag;
8'h5A: key_return<=~releaseflag;
8'h71: key_del<=~releaseflag;
8'h11: key_alt<=~releaseflag;
default:;
endcase
end
end
end
end
always @(posedge clk)
begin
colsel[0]<=(key_del & rowsel[0]) | (key_3 & rowsel[1]) | (key_5 & rowsel[2]) | (key_7 & rowsel[3]) | (key_9 & rowsel[4]) | (key_down & rowsel[5]) | (key_left & rowsel[6]) | (key_1 & rowsel[7]);
colsel[1]<=(key_return & rowsel[0]) | (key_W & rowsel[1]) | (key_R & rowsel[2]) | (key_Y & rowsel[3]) | (key_I & rowsel[4]) | (key_P & rowsel[5]) | (key_star & rowsel[6]) | (key_home & rowsel[7]);
colsel[2]<=(key_pound & rowsel[0]) | (key_A & rowsel[1]) | (key_D & rowsel[2]) | (key_G & rowsel[3]) | (key_J & rowsel[4]) | (key_L & rowsel[5]) | (key_semicolon & rowsel[6]) | (key_control & rowsel[7]);
colsel[3]<=(key_help & rowsel[0]) | (key_4 & rowsel[1]) | (key_6 & rowsel[2]) | (key_8 & rowsel[3]) | (key_0 & rowsel[4]) | (key_up & rowsel[5]) | (key_right & rowsel[6]) | (key_2 & rowsel[7]);
colsel[4]<=(key_F1 & rowsel[0]) | (key_Z & rowsel[1]) | (key_C & rowsel[2]) | (key_B & rowsel[3]) | (key_M & rowsel[4]) | (key_dot & rowsel[5]) | (key_esc & rowsel[6]) | (key_space & rowsel[7]);
colsel[5]<=(key_F2 & rowsel[0]) | (key_S & rowsel[1]) | (key_F & rowsel[2]) | (key_H & rowsel[3]) | (key_K & rowsel[4]) | (key_colon & rowsel[5]) | (key_equal & rowsel[6]) | (key_commodore & rowsel[7]);
colsel[6]<=(key_F3 & rowsel[0]) | (key_E & rowsel[1]) | (key_T & rowsel[2]) | (key_U & rowsel[3]) | (key_O & rowsel[4]) | (key_minus & rowsel[5]) | (key_plus & rowsel[6]) | (key_Q & rowsel[7]);
colsel[7]<=(key_AT & rowsel[0]) | (key_shift & rowsel[1]) | (key_X & rowsel[2]) | (key_V & rowsel[3]) | (key_N & rowsel[4]) | (key_comma & rowsel[5]) | (key_slash & rowsel[6]) | (key_runstop & rowsel[7]);
end
assign kbus=~colsel;
endmodule