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70
Commodore_64/C64keys.txt
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70
Commodore_64/C64keys.txt
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C64 pinout when ping 0-9 and A-I connected to teensy 0-18
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IMPORTANT: SKIP PIN 13 AS IT IS CONNECTED TO LED
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AND WILL GIVE YOU FALSE READINGS
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Esc 4 20
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1 20 2
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2 16 20
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3 2 22
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4 16 22
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5 2 24
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6 16 24
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7 2 26
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8 16 26
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9 2 23
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0 16 23
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+ 2 21
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- 16 21
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Funt 2 19
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Clr/Home 16 19
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Inst/Del 17 2
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Control 6 20
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Q 14 20
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W 4 22
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E 14 22
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R 24 4
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T 14 24
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Y 4 26
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U 14 26
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I 4 23
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O 14 23
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P 4 21
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@ 14 21
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* 4 19
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Pi 14 19
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Restore 18 15
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Run/Stop 8 20
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ShiftLock 8 22
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A 6 22
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S 12 22
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D 6 24
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F 12 24
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G 26 6
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H 12 26
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J 23 6
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K 12 23
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L 6 21
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:[ 21 12
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;] 6 19
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= 12 19
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Return 17 4
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C= 12 20
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LShift 8 22
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Z 22 10
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X 8 24
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C 24 10
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V 8 26
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B 10 26
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N 8 23
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M 10 23
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, 8 21
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. 10 21
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/ 19 8
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RShift 10 19
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CrsrUpDown 17 8
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CrsrLeftRight 6 17
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F1 10 17
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F3 12 17
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F5 14 17
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F7 16 17
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Spc 10 20
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8
Commodore_64/C64speckeys.txt
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8
Commodore_64/C64speckeys.txt
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cntrl-l 6 20 (Control)
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cntrl-r ---
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shift-l 8 22 (LShift)
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shift-r 10 21 (RShift)
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alt-l 8 20 (Run Stop)
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alt-r 17 18 (Restore)
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gui 20 12 (C=)
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fn ---
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489
Commodore_64/Commodore_C64.ino
Normal file
489
Commodore_64/Commodore_C64.ino
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/* Copyright 2019 Olga, based on work of Frank Adams
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// This software implements an C64 Keyboard Controller using a Teensy LC connected
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// directly with keyboard
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// Keyboard pins 0-9 and A-F are connected to Teensy LC pins 0-18 respectively in order.
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// IMPORTANT ! DO NOT CONNECT PIN 13 AS IT DRIVES LED AND GIVES RANDOM READING !
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// This routine uses the Teensyduino "Micro-Manager Method" to send Normal and Modifier
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// keys over USB.
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// Description of Teensyduino keyboard functions is at www.pjrc.com/teensy/td_keyboard.html
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//
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// Revision History
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// Initial Release Mar 27, 2019
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//
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//
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// comment this line to have debug code included
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#define NODEBUG
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struct KeyDesc {
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const char* name;
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boolean isModifier;
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int pin1;
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int pin2;
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int keyCode;
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int keyCode2;
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boolean scanned;
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};
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struct KeyDesc Keys[] =
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{
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{ "CTRL", true, 6, 20, MODIFIERKEY_CTRL, 0 },
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{ "LSHIFT", true, 8, 22, MODIFIERKEY_LEFT_SHIFT, 0 },
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{ "RSHIFT", true, 10, 19, MODIFIERKEY_RIGHT_SHIFT, 0 },
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{ "LALT (RSTOP)", true, 8, 20, MODIFIERKEY_LEFT_ALT, 0 },
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{ "RALT (RESTORE)", true, 15, 18, MODIFIERKEY_RIGHT_ALT, 0 },
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{ "GUI", true, 20, 12, MODIFIERKEY_GUI, 0 },
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{ "ESC", false, 4, 20, KEY_ESC, 0 },
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{ "1", false, 2, 20, KEY_1, 0 },
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{ "2", false, 16, 20, KEY_2, 0 },
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{ "3", false, 22, 2, KEY_3, 0 },
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{ "4", false, 16, 22, KEY_4, 0 },
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{ "5", false, 2, 24, KEY_5, 0 },
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{ "6", false, 16, 24, KEY_6, 0 },
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{ "7", false, 2, 26, KEY_7, 0 },
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{ "8", false, 16, 26, KEY_8, 0 },
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{ "9", false, 2, 23, KEY_9, 0 },
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{ "0", false, 23, 16, KEY_0, 0 },
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{ "+", false, 2, 21, KEYPAD_PLUS, 0 },
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{ "-", false, 21, 16, KEYPAD_MINUS, 0 },
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{ "END (Pound)", false, 19, 2, KEY_END },
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{ "HOME", false, 16, 19, KEY_HOME, KEY_DELETE },
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{ "BACKSPACE", false, 2, 17, KEY_BACKSPACE, KEY_INSERT },
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{ "Q", false, 14, 20, KEY_Q, 0 },
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{ "W", false, 4, 22, KEY_W, 0 },
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{ "E", false, 14, 22, KEY_E, 0 },
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{ "R", false, 4, 24, KEY_R, 0 },
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{ "T", false, 14, 24, KEY_T, 0 },
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{ "Y", false, 4, 26, KEY_Y, 0 },
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{ "U", false, 26, 14, KEY_U, 0 },
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{ "I", false, 23, 4, KEY_I, 0 },
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{ "O", false, 23, 14, KEY_O, 0 },
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{ "P", false, 21, 4, KEY_P, 0 },
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{ "TAB (@)", false, 14, 21, KEY_TAB, 0 },
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{ "*", false, 4, 19, KEYPAD_ASTERIX, 0 },
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{ "BACKSLASH (Pi)", false, 19, 14, KEY_BACKSLASH, 0 },
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{ "A", false, 6, 22, KEY_A, 0 },
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{ "S", false, 22, 12, KEY_S, 0 },
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{ "D", false, 6, 24, KEY_D, 0 },
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{ "F", false, 12, 24, KEY_F, 0 },
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{ "G", false, 6, 26, KEY_G, 0 },
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{ "H", false, 12, 26, KEY_H, 0 },
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{ "J", false, 23, 6, KEY_J, 0 },
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{ "K", false, 23, 12, KEY_K, 0 },
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{ "L", false, 21, 6, KEY_L, 0 },
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{ "'", false, 12, 21, KEY_QUOTE, 0 },
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{ ";", false, 6, 19, KEY_SEMICOLON, 0 },
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{ "=", false, 12, 19, KEY_EQUAL, 0 },
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{ "ENTER", false, 4, 17, KEY_ENTER, 0 },
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{ "Z", false, 10, 22, KEY_Z, 0 },
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{ "X", false, 8, 24, KEY_X, 0 },
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{ "C", false, 10, 24, KEY_C, 0 },
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{ "V", false, 8, 26, KEY_V, 0 },
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{ "B", false, 10, 26, KEY_B, 0 },
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{ "N", false, 23, 8, KEY_N, 0 },
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{ "M", false, 23, 10, KEY_M, 0 },
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{ ",", false, 8, 21, KEY_COMMA, 0 },
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{ ".", false, 10, 21, KEY_PERIOD, 0 },
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{ "/", false, 8, 19, KEY_SLASH, 0 },
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{ "UP", false, 8, 17, KEY_DOWN, KEY_UP },
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{ "LEFT", false, 6, 17, KEY_RIGHT, KEY_LEFT },
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{ "F1", false, 10, 17, KEY_F1, KEY_F2 },
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{ "F3", false, 12, 17, KEY_F3, KEY_F4 },
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{ "F5", false, 17, 14, KEY_F5, KEY_F6 },
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{ "F7", false, 16, 17, KEY_F7, KEY_F8 },
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{ "SPACE", false, 10, 20, KEY_SPACE, 0 },
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{ "none", false, 0, 0, 0, 0 } // last key - no key
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};
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// second keycode accessible via modifier
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#define SECOND_CODE MODIFIERKEY_RIGHT_SHIFT
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// number of teensy pins
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#define PIN_MAX 26
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// PIN to IO number; zero-index is not valid and hence -1
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const int PinToIO[] = { -1, 23, 0, 22, 1, 24, 2, 21, 3, 25, 4, 20, 5, 19, 6, 18, 7, 17, 8, 16, 9, 15, 10, 14, 11, 26, 12 };
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const int ForbiddenInputs[] = { -1 };
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const int ForbiddenOutputs[] = { -1 };
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boolean is_input_allowed(int pin) {
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for(int i = 0 ; ; i++) {
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int input = ForbiddenInputs[i];
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if (input <= 0) {
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break;
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}
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if (input == pin) {
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return false;
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}
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}
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return true;
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}
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boolean is_output_allowed(int pin) {
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for(int i = 0 ; ; i++) {
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int output = ForbiddenOutputs[i];
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if (output <= 0) {
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break;
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}
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if (output == pin) {
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return false;
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}
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}
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return true;
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}
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// slots hold the normal key values to be sent over USB.
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// WARNING - this must be set between 1 and 6
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#define SLOT_NORMAL_COUNT 6
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int slots[SLOT_NORMAL_COUNT];
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// modifiers table holds - surprise - the modifier keys states
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#define SLOT_MOD_COUNT 6
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int mods[SLOT_MOD_COUNT];
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// general check for button pressed
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boolean is_pressed(int key, int* slot, int slotCount) {
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for(int i = 0; i < slotCount ; i++) {
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if (slot[i] == key) {
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return true;
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}
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}
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return false;
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}
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// general slot setup function, returns true on change
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boolean set_slot(int key, boolean isPressed, int* slot, int slotCount) {
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boolean currentlyPressed = is_pressed(key, slot, slotCount);
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if (currentlyPressed == isPressed) {
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return false;
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}
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for(int i = 0; i < slotCount ; i++) {
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if ((isPressed && slot[i] == 0) || (!isPressed && slot[i] == key)) {
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slot[i] = isPressed ? key : 0;
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return true;
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}
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}
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return false;
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}
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// check if normal key pressed
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boolean is_key_pressed(int key) {
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return is_pressed(key, slots, SLOT_NORMAL_COUNT);
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}
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// check if mod key pressed
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boolean is_mod_pressed(int key) {
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return is_pressed(key, mods, SLOT_MOD_COUNT);
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}
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// Function to load the key name into the first available slot
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boolean load_slot(int key) {
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return set_slot(key, true, slots, SLOT_NORMAL_COUNT);
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}
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// Function to clear the slot that contains the key name
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boolean clear_slot(int key) {
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return set_slot(key, false, slots, SLOT_NORMAL_COUNT);
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}
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// Function to load the modifier key name into the appropriate mod variable
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boolean load_mod(int m_key) {
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return set_slot(m_key, true, mods, SLOT_MOD_COUNT);
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}
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// Function to load 0 into the appropriate mod variable
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boolean clear_mod(int m_key) {
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return set_slot(m_key, false, mods, SLOT_MOD_COUNT);
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}
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//
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// Function to send the modifier keys over usb
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void send_mod() {
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int totalMod = 0;
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for(int i = 0; i < SLOT_MOD_COUNT ; i++) {
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totalMod |= mods[i];
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}
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Keyboard.set_modifier(totalMod);
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Keyboard.send_now();
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}
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//
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// Function to send the normal keys in the 6 slots over usb
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void send_normals() {
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for(int i = 0 ; i < SLOT_NORMAL_COUNT ; i++) {
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int value = slots[i];
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switch(i) {
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case 0:
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Keyboard.set_key1(value);
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break;
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case 1:
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Keyboard.set_key2(value);
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break;
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case 2:
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Keyboard.set_key3(value);
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break;
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case 3:
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Keyboard.set_key4(value);
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break;
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case 4:
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Keyboard.set_key5(value);
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break;
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case 5:
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Keyboard.set_key6(value);
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break;
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default:
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// no send here
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break;
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}
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}
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Keyboard.send_now();
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}
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//
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// Function to set a pin to high impedance (acts like open drain output)
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void go_z(int pin)
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{
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pinMode(pin, INPUT);
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digitalWrite(pin, HIGH);
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}
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//
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// Function to set a pin as an input with a pullup
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void go_pu(int pin)
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{
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pinMode(pin, INPUT_PULLUP);
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digitalWrite(pin, HIGH);
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}
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//
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// Function to send a pin to a logic low
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void go_0(int pin)
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{
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pinMode(pin, OUTPUT);
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digitalWrite(pin, LOW);
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}
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//
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// Function to send a pin to a logic high
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void go_1(int pin)
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{
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pinMode(pin, OUTPUT);
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digitalWrite(pin, HIGH);
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}
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// find highest count less than given if given
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int FindMaxPin(int* PinCount, int lessThan) {
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int maxPin = -1;
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int currentMax = -1;
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for(int i = 1 ; i <= PIN_MAX ; i++) {
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int value = PinCount[i];
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if (value > currentMax && (lessThan < 0 || value <= lessThan)) {
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maxPin = i;
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currentMax = value;
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}
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}
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return maxPin;
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}
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////// DEBUG CODE
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void d_start() {
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#ifndef NODEBUG
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Serial.begin(9600);
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#endif
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}
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void d_print(const char* format, ...) {
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#ifndef NODEBUG
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va_list(aptr);
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int ret;
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char buffer[200];
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va_start(aptr, format);
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ret = vsprintf(buffer, format, aptr);
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va_end(aptr);
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if (ret >= 0) {
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Serial.println(buffer);
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} else {
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Serial.println("--- error constructing debug log ---");
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}
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#endif
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}
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////// END DEBUG CODE
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int KeyCount;
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int PinOrderFromMax[PIN_MAX];
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//
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//----------------------------------Setup-------------------------------------------
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void setup() {
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d_start();
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d_print("Setup Start");
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// setup keyboard tables
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for(int i = 0 ; i < SLOT_NORMAL_COUNT ; i++) {
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slots[i] = 0;
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}
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for(int i = 0 ; i < SLOT_MOD_COUNT ; i++) {
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mods[i] = 0;
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}
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int PinCount[PIN_MAX + 1];
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// calculate pin count given
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for(int i = 1 ; i <= PIN_MAX ; i++) {
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PinCount[i] = 0;
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}
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for(int i = 0 ; ; i++) {
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const struct KeyDesc& keyDesc = Keys[i];
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if (keyDesc.keyCode == 0) {
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KeyCount = i;
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break;
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}
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PinCount[keyDesc.pin1]++;
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PinCount[keyDesc.pin2]++;
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}
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int maxPin = -1;
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for(int i = 0 ; i < PIN_MAX ; i++) {
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maxPin = FindMaxPin(PinCount, maxPin > 0 ? PinCount[maxPin] : -1);
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if (maxPin > 0) {
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PinOrderFromMax[i] = maxPin;
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PinCount[maxPin] = -1;
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} else {
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PinOrderFromMax[i] = -1;
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}
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}
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for(int i = 1 ; i <= PIN_MAX ; i++) {
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go_pu(PinToIO[i]);
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}
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d_print("Setup OK");
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}
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//
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//
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//---------------------------------Main Loop---------------------------------------------
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//
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void loop() {
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// prepare table of scanned keys
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for(int i = 0 ; i < KeyCount ; i++) {
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Keys[i].scanned = false;
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}
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for(int i = 0 ; i < PIN_MAX ; i++) {
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// find maximum pin count in prepared table
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int pinAsOutput = PinOrderFromMax[i];
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if (pinAsOutput <= 0 || !is_output_allowed(pinAsOutput)) {
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continue;
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}
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// set this pin as output, find corresponding keys and set their other pins as input will pullup
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// input on other pins
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boolean anyKey = false;
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boolean hasUnscanned = false;
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for(int i = 0 ; i < KeyCount; i++) {
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KeyDesc& keyDesc = Keys[i];
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hasUnscanned |= !keyDesc.scanned;
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int pinAsInput = -1;
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if (keyDesc.pin1 == pinAsOutput) {
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pinAsInput = keyDesc.pin2;
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} else
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if (keyDesc.pin2 == pinAsOutput) {
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pinAsInput = keyDesc.pin1;
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}
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if (pinAsInput > 0 && is_input_allowed(pinAsInput) && !keyDesc.scanned) {
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||||
anyKey = true;
|
||||
go_pu(PinToIO[pinAsInput]);
|
||||
}
|
||||
}
|
||||
// if no unscanned keys found, break
|
||||
if (!hasUnscanned) {
|
||||
break;
|
||||
}
|
||||
// if no keys for this pin found, next loop
|
||||
if (!anyKey) {
|
||||
continue;
|
||||
}
|
||||
// logic LOW will set this to active
|
||||
go_0(PinToIO[pinAsOutput]);
|
||||
// delay to settle
|
||||
delayMicroseconds(10);
|
||||
// read state
|
||||
for(int i = 0 ; i < KeyCount ; i++) {
|
||||
KeyDesc& keyDesc = Keys[i];
|
||||
int pinAsInput = -1;
|
||||
if (keyDesc.pin1 == pinAsOutput) {
|
||||
pinAsInput = keyDesc.pin2;
|
||||
} else
|
||||
if (keyDesc.pin2 == pinAsOutput) {
|
||||
pinAsInput = keyDesc.pin1;
|
||||
}
|
||||
if (pinAsInput > 0 && !keyDesc.scanned) {
|
||||
keyDesc.scanned = true;
|
||||
int keyCode = keyDesc.keyCode;
|
||||
int keyCode2 = keyDesc.keyCode2;
|
||||
boolean useCode2 = keyCode2 != 0 && is_mod_pressed(SECOND_CODE);
|
||||
int currentValue = digitalRead(PinToIO[pinAsInput]);
|
||||
if (!currentValue) {
|
||||
// new key pressed
|
||||
if (keyDesc.isModifier) {
|
||||
if (load_mod(keyCode)) {
|
||||
d_print("Mod pressed: %s",keyDesc.name);
|
||||
send_mod();
|
||||
}
|
||||
} else {
|
||||
// if must use code2, then release keyCode and substitute keyCode with second code
|
||||
// then release SECOND_CODE, then press code2, then re-press SECOND_CODE
|
||||
if (useCode2) {
|
||||
if (load_slot(keyCode2)) {
|
||||
d_print("Code 2 pressed: %s",keyDesc.name);
|
||||
clear_mod(SECOND_CODE);
|
||||
send_mod();
|
||||
send_normals();
|
||||
load_mod(SECOND_CODE);
|
||||
send_mod();
|
||||
}
|
||||
} else {
|
||||
// normal way
|
||||
if (load_slot(keyCode)) {
|
||||
d_print("Normal pressed: %s",keyDesc.name);
|
||||
send_normals();
|
||||
}
|
||||
}
|
||||
}
|
||||
} else { // key released
|
||||
if (keyDesc.isModifier) {
|
||||
if (clear_mod(keyCode)) {
|
||||
d_print("Mod released: %s",keyDesc.name);
|
||||
send_mod();
|
||||
}
|
||||
} else {
|
||||
if (useCode2) {
|
||||
if (clear_slot(keyCode2)) {
|
||||
d_print("Code 2 released: %s",keyDesc.name);
|
||||
send_normals();
|
||||
}
|
||||
} else {
|
||||
// normal way
|
||||
if (clear_slot(keyCode)) {
|
||||
d_print("Normal released: %s",keyDesc.name);
|
||||
send_normals();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
// disable pin
|
||||
go_z(PinToIO[pinAsOutput]);
|
||||
}
|
||||
//
|
||||
// **********keyboard scan complete
|
||||
//
|
||||
// Turn on the LED on the Teensy for Caps Lock based on bit 1 in the keyboard_leds variable controlled by the USB host computer
|
||||
//
|
||||
if (is_mod_pressed(MODIFIERKEY_LEFT_SHIFT) || is_mod_pressed(MODIFIERKEY_RIGHT_SHIFT)) { // mask off all bits but D1 and test if set
|
||||
go_1(LED_BUILTIN); // turn on the LED
|
||||
} else {
|
||||
go_0(LED_BUILTIN); // turn off the LED
|
||||
}
|
||||
//
|
||||
delay(25); // The overall keyboard scanning rate is about 30ms
|
||||
}
|
||||
BIN
Commodore_64/Readme.pdf
Normal file
BIN
Commodore_64/Readme.pdf
Normal file
Binary file not shown.
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Reference in a new issue