-
Notifications
You must be signed in to change notification settings - Fork 12
/
keyboard.sv
229 lines (205 loc) · 7.21 KB
/
keyboard.sv
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
// 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, 8'h12: mod[0]<= ~release_btn; // left-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'h49 : keys[7][1] <= release_btn; // .
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'h76 : begin // Escape (CAPS SPACE)
keys[0][0] <= release_btn;
keys[7][0] <= release_btn;
end
8'h41 : begin // ,
keys[0][0] <= release_btn;
keys[7][1] <= release_btn | shift;
end
8'h4A : begin // / ?
keys[0][0] <= release_btn;
keys[0][3] <= release_btn | ~shift;
keys[0][4] <= release_btn | shift;
end
8'h4C : begin // ; :
keys[0][0] <= release_btn;
keys[0][1] <= release_btn | ~shift;
keys[0][2] <= release_btn | shift;
end
8'h52 : begin // "
keys[0][0] <= release_btn;
keys[5][0] <= release_btn | shift;
end
8'h4E : begin // -
keys[0][0] <= release_btn;
keys[6][3] <= release_btn | shift;
end
8'h55 : begin // = +
keys[0][0] <= release_btn;
keys[6][2] <= release_btn | ~shift;
keys[6][1] <= release_btn | shift;
end
default: ;
endcase
end
end
always @(posedge clk_sys) begin
reg old_state;
input_strobe <= 0;
old_state <= ps2_key[10];
if(old_state != ps2_key[10]) begin
release_btn <= ~ps2_key[9];
code <= ps2_key[7:0];
input_strobe <= 1;
end
end
endmodule