500 lines
20 KiB
C++
500 lines
20 KiB
C++
/* Copyright 2019 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 a GRID 1550 Laptop Keyboard Controller using a Teensy LC
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// for use with a Windows PC.
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//
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// Revision History
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// Initial Release Dec 12, 2019 - Created from Linux version, uses alt codes for \ and | which are not
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// compatible with Linux
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//
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#define MODIFIERKEY_FN 0x8f // give Fn key a fake HID code
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#define CAPS_LED 13 // Teensy LED on IO#13 shows Caps-Lock
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#define NUM_LED 0 // Teensy IO#0 shows Num-Lock (wire to anode of new LED)
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//
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const byte rows_max = 11; // sets the number of rows in the matrix
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const byte cols_max = 13; // sets the number of columns in the matrix
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//
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// Load the normal key matrix with the Teensyduino key names
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// described at www.pjrc.com/teensy/td_keyboard.html
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// A zero indicates no normal key at that location.
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int normal[rows_max][cols_max] = {
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{0,0,0,0,0,KEY_F1,KEY_F2,KEY_F3,KEY_F4,KEY_F5,0,KEY_F9,0},
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{0,0,0,0,KEY_SPACE,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,KEY_ESC,KEY_1,0,KEY_F6,KEY_F7,KEY_F8,KEY_F10,0},
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{0,0,0,0,0,KEY_TAB,KEY_Q,KEY_W,KEY_2,KEY_3,0,KEY_6,0},
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{0,0,0,0,0,KEY_CAPS_LOCK,KEY_A,KEY_S,KEY_E,KEY_4,KEY_5,KEY_7,0},
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{0,0,0,KEY_LEFT,0,0,0,KEY_Z,KEY_F,KEY_D,KEY_8,KEY_9,0},
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{0,0,0,KEY_DOWN,0,0,KEY_X,KEY_C,KEY_G,KEY_R,KEY_T,KEY_0,0},
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{0,0,0,KEY_NUM_LOCK,0,KEY_SCROLL_LOCK,KEY_V,KEY_B,KEY_H,KEY_Y,KEY_U,KEY_MINUS,0},
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{0,0,0,KEY_TILDE,0,KEY_UP,KEY_N,KEY_M,KEY_J,KEY_K,KEY_I,KEY_INSERT,0},
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{0,0,0,KEY_BACKSLASH,0,KEY_RIGHT_BRACE,KEY_COMMA,KEY_BACKSPACE,KEY_L,KEY_DELETE,KEY_O,KEY_EQUAL,0},
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{0,0,0,KEY_RIGHT,0,KEY_ENTER,KEY_SLASH,KEY_PERIOD,KEY_QUOTE,KEY_SEMICOLON,KEY_LEFT_BRACE,KEY_P,0}
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};
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// Load the numlock key matrix with key names at the correct row-column location.
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// This matrix is the same as the normal matrix except for the number pad keys
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// A zero indicates no numlock key at that location.
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int numlock[rows_max][cols_max] = {
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{0,0,0,0,0,KEY_F1,KEY_F2,KEY_F3,KEY_F4,KEY_F5,0,KEY_F9,0},
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{0,0,0,0,KEY_SPACE,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,KEY_ESC,KEY_1,0,KEY_F6,KEY_F7,KEY_F8,KEY_F10,0},
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{0,0,0,0,0,KEY_TAB,KEY_Q,KEY_W,KEY_2,KEY_3,0,KEY_6,0},
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{0,0,0,0,0,KEY_CAPS_LOCK,KEY_A,KEY_S,KEY_E,KEY_4,KEY_5,KEYPAD_7,0},
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{0,0,0,KEY_LEFT,0,0,0,KEY_Z,KEY_F,KEY_D,KEYPAD_8,KEYPAD_9,0},
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{0,0,0,KEY_DOWN,0,0,KEY_X,KEY_C,KEY_G,KEY_R,KEY_T,KEYPAD_ASTERIX,0},
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{0,0,0,KEY_NUM_LOCK,0,KEY_SCROLL_LOCK,KEY_V,KEY_B,KEY_H,KEY_Y,KEYPAD_4,KEY_MINUS,0},
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{0,0,0,KEY_TILDE,0,KEY_UP,KEY_N,KEY_M,KEYPAD_1,KEYPAD_2,KEYPAD_5,KEY_INSERT,0},
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{0,0,0,KEY_BACKSLASH,0,KEY_RIGHT_BRACE,KEYPAD_0,KEY_BACKSPACE,KEYPAD_3,KEY_DELETE,KEYPAD_6,KEY_EQUAL,0},
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{0,0,0,KEY_RIGHT,0,KEY_ENTER,KEYPAD_SLASH,KEYPAD_PERIOD,KEY_QUOTE,KEYPAD_PLUS,KEY_LEFT_BRACE,KEYPAD_MINUS,0}
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};
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// Load the modifier key matrix with key names at the correct row-column location.
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// A zero indicates no modifier key at that location.
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int modifier[rows_max][cols_max] = {
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{MODIFIERKEY_LEFT_SHIFT,MODIFIERKEY_FN,MODIFIERKEY_RIGHT_SHIFT,0,0,0,0,0,0,0,0,0,MODIFIERKEY_LEFT_ALT},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,MODIFIERKEY_LEFT_CTRL,0,0,0,0,0,0,0},
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{0,0,0,0,0,MODIFIERKEY_RIGHT_ALT,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0}
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};
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// Load the media key matrix with Fn key names at the correct row-column location.
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// A zero indicates no media key at that location.
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int media[rows_max][cols_max] = {
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,0,0,0,0,0,0,0,0},
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{0,0,0,KEY_HOME,0,0,0,0,0,0,0,0,0},
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{0,0,0,KEY_PAGE_DOWN,0,0,0,0,0,0,0,0,0},
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{0,0,0,0,0,KEY_PAUSE,0,0,0,0,0,0,0},
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{0,0,0,0,0,KEY_PAGE_UP,0,0,0,0,0,KEY_F11,0},
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{0,0,0,0,0,0,0,0,0,KEY_F12,0,0,0},
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{0,0,0,KEY_END,0,0,0,0,0,0,0,0,0}
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};
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// Initialize the old_key matrix with one's.
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// 1 = key not pressed, 0 = key is pressed
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boolean old_key[rows_max][cols_max] = {
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1},
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{1,1,1,1,1,1,1,1,1,1,1,1,1}
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};
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//
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// Define the Teensy LC I/O numbers (translated from the FPC pin #)
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// Row FPC pin # 04,06,08,10,12,14,16,18,20,22,24
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// Teensy I/O # 01,02,03,04,05,06,07,08,09,10,11
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int Row_IO[rows_max] = {1,2,3,4,5,6,7,8,9,10,11}; // Teensy LC I/O numbers for rows
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//
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// Column FPC pin # 01,03,05,07,09,11,13,15,17,19,21,23,26
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// Teensy I/O # 23,22,24,21,25,20,19,18,17,16,15,14,12
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int Col_IO[cols_max] = {23,22,24,21,25,20,19,18,17,16,15,14,12}; // Teensy LC I/O numbers for columns
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// Declare variables that will be used by functions
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boolean slots_full = LOW; // Goes high when slots 1 thru 6 contain normal keys
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// slot 1 thru slot 6 hold the normal key values to be sent over USB.
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int slot1 = 0; //value of 0 means the slot is empty and can be used.
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int slot2 = 0;
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int slot3 = 0;
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int slot4 = 0;
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int slot5 = 0;
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int slot6 = 0;
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//
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int mod_shift_l = 0; // These variables are sent over USB as modifier keys.
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int mod_shift_r = 0; // Each is either set to 0 or MODIFIER_ ...
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int mod_ctrl_l = 0;
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int mod_ctrl_r = 0;
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int mod_alt_l = 0;
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int mod_alt_r = 0;
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int mod_gui = 0;
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//
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// Function to load the key name into the first available slot
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void load_slot(int key) {
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if (!slot1) {
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slot1 = key;
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}
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else if (!slot2) {
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slot2 = key;
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}
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else if (!slot3) {
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slot3 = key;
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}
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else if (!slot4) {
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slot4 = key;
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}
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else if (!slot5) {
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slot5 = key;
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}
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else if (!slot6) {
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slot6 = key;
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}
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if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6) {
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slots_full = LOW; // slots are not full
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}
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else {
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slots_full = HIGH; // slots are full
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}
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}
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//
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// Function to clear the slot that contains the key name
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void clear_slot(int key) {
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if (slot1 == key) {
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slot1 = 0;
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}
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else if (slot2 == key) {
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slot2 = 0;
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}
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else if (slot3 == key) {
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slot3 = 0;
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}
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else if (slot4 == key) {
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slot4 = 0;
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}
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else if (slot5 == key) {
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slot5 = 0;
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}
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else if (slot6 == key) {
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slot6 = 0;
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}
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if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6) {
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slots_full = LOW; // slots are not full
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}
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else {
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slots_full = HIGH; // slots are full
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}
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}
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//
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// Function to load the modifier key name into the appropriate mod variable
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void load_mod(int m_key) {
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if (m_key == MODIFIERKEY_LEFT_SHIFT) {
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mod_shift_l = m_key;
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}
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else if (m_key == MODIFIERKEY_RIGHT_SHIFT) {
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mod_shift_r = m_key;
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}
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else if (m_key == MODIFIERKEY_LEFT_CTRL) {
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mod_ctrl_l = m_key;
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}
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else if (m_key == MODIFIERKEY_RIGHT_CTRL) {
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mod_ctrl_r = m_key;
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}
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else if (m_key == MODIFIERKEY_LEFT_ALT) {
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mod_alt_l = m_key;
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}
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else if (m_key == MODIFIERKEY_RIGHT_ALT) {
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mod_alt_r = m_key;
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}
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else if (m_key == MODIFIERKEY_GUI) {
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mod_gui = m_key;
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}
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}
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//
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// Function to load 0 into the appropriate mod variable
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void clear_mod(int m_key) {
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if (m_key == MODIFIERKEY_LEFT_SHIFT) {
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mod_shift_l = 0;
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}
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else if (m_key == MODIFIERKEY_RIGHT_SHIFT) {
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mod_shift_r = 0;
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}
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else if (m_key == MODIFIERKEY_LEFT_CTRL) {
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mod_ctrl_l = 0;
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}
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else if (m_key == MODIFIERKEY_RIGHT_CTRL) {
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mod_ctrl_r = 0;
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}
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else if (m_key == MODIFIERKEY_LEFT_ALT) {
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mod_alt_l = 0;
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}
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else if (m_key == MODIFIERKEY_RIGHT_ALT) {
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mod_alt_r = 0;
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}
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else if (m_key == MODIFIERKEY_GUI) {
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mod_gui = 0;
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}
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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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Keyboard.set_modifier(mod_shift_l | mod_shift_r | mod_ctrl_l | mod_ctrl_r | mod_alt_l | mod_alt_r | mod_gui);
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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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Keyboard.set_key1(slot1);
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Keyboard.set_key2(slot2);
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Keyboard.set_key3(slot3);
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Keyboard.set_key4(slot4);
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Keyboard.set_key5(slot5);
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Keyboard.set_key6(slot6);
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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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//
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//----------------------------------Setup-------------------------------------------
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void setup() {
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for (int a = 0; a < cols_max; a++) { // loop thru all column pins
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go_pu(Col_IO[a]); // set each column pin as an input with a pullup
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}
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//
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for (int b = 0; b < rows_max; b++) { // loop thru all row pins
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go_z(Row_IO[b]); // set each row pin as a floating output
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}
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}
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//
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boolean Fn_pressed = HIGH; // Initialize Fn key to HIGH = "not pressed"
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extern volatile uint8_t keyboard_leds; // 8 bits sent from Pi to Teensy that give keyboard LED status. Caps lock is bit D1.
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//
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//---------------------------------Main Loop---------------------------------------------
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//
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void loop() {
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// Scan keyboard matrix with an outer loop that drives each row low and an inner loop that reads every column (with pull ups).
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// The routine looks at each key's present state (by reading the column input pin) and also the previous state from the last scan
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// that was 30msec ago. The status of a key that was just pressed or just released is sent over USB and the state is saved in the old_key matrix.
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// The keyboard keys will read as logic low if they are pressed (negative logic).
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// The old_key matrix also uses negative logic (low=pressed).
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//
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for (int x = 0; x < rows_max; x++) { // loop thru the rows
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go_0(Row_IO[x]); // Activate Row (send it low)
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delayMicroseconds(10); // give the row time to go low and settle out
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for (int y = 0; y < cols_max; y++) { // loop thru the columns
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// **********Modifier keys including the Fn special case
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if (modifier[x][y] != 0) { // check if modifier key exists
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if (!digitalRead(Col_IO[y]) && (old_key[x][y])) { // Read column to see if key is low (pressed) and was previously not pressed
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if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key
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if (Fn_pressed) { // only send modifier keys if Fn key is not currently held down
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load_mod(modifier[x][y]); // function reads which modifier key is pressed and loads it into the appropriate mod_... variable
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send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed
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old_key[x][y] = LOW; // Save state of key as "pressed"
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}
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else { // Fn key is already held down so check if right alt key is pressed and send print screen if yes
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if (modifier[x][y] == MODIFIERKEY_RIGHT_ALT) {
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Keyboard.press(KEY_PRINTSCREEN);
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delay(5);
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Keyboard.release(KEY_PRINTSCREEN);
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delay(5);
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}
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}
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}
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else {
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Fn_pressed = LOW; // Fn status variable is active low
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old_key[x][y] = LOW; // old_key state is "pressed" (active low)
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}
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}
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else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed and was previously pressed
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if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key
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clear_mod(modifier[x][y]); // function reads which modifier key was released and loads 0 into the appropriate mod_... variable
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send_mod(); // function sends all mod's over usb including the one that just released
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old_key[x][y] = HIGH; // Save state of key as "not pressed"
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}
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else {
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Fn_pressed = HIGH; // Fn is no longer active
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old_key[x][y] = HIGH; // old_key state is "not pressed"
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}
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}
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}
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// ***********end of modifier section
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//
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// ***********Normal keys and media keys in this section
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else if ((normal[x][y] != 0) || (media[x][y] != 0)) { // check if normal or media key exists at this location in the array
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if (!digitalRead(Col_IO[y]) && (old_key[x][y]) && (!slots_full)) { // check if key pressed and not previously pressed and slots not full
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old_key[x][y] = LOW; // Save state of key as "pressed"
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if (Fn_pressed) { // Fn_pressed is active low so it is not pressed and normal key needs to be sent
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if (keyboard_leds & 1) { // test if Num Lock is turned on
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load_slot(numlock[x][y]); //update first available slot with key name from numlock matrix
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send_normals(); // send all slots over USB including the key that just got pressed
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}
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else {
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load_slot(normal[x][y]); //update first available slot with key name from normal matrix
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send_normals(); // send all slots over USB including the key that just got pressed
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}
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}
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else if (media[x][y] != 0) { // Fn is pressed so send media if a key exists in the matrix
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Keyboard.press(media[x][y]); // media key is sent using keyboard press function per PJRC
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delay(5); // delay 5 milliseconds before releasing to make sure it gets sent over USB
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Keyboard.release(media[x][y]); // send media key release
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}
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else if (normal[x][y] == KEY_Z) { // Fn is pressed but no media key so check if KEY_Z is pressed
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// if using this keyboard on a Raspberry Pi, comment out the following Alt code section and uncomment the unicode section
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// *******Windows PC Alt Code sequence to give a backslash is Alt 92*******************************
|
|
Keyboard.press(MODIFIERKEY_LEFT_ALT); // Push and hold Left Alt
|
|
delay(5);
|
|
Keyboard.press(KEYPAD_9); // Push 9
|
|
delay(5);
|
|
Keyboard.release(KEYPAD_9); // Release 9
|
|
delay(5);
|
|
Keyboard.press(KEYPAD_2); // Push 2
|
|
delay(5);
|
|
Keyboard.release(KEYPAD_2); // Release 2
|
|
delay(5);
|
|
Keyboard.release(MODIFIERKEY_LEFT_ALT); // Release Left Alt
|
|
delay(5);
|
|
// *******Raspberry Pi Unicode sequence to give a backslash is Control+Shift+u 5c Enter*****************************
|
|
/* Keyboard.press(MODIFIERKEY_LEFT_CTRL); // Push and hold Left Control
|
|
delay(5);
|
|
Keyboard.press(MODIFIERKEY_LEFT_SHIFT); // Push and hold Left Shift
|
|
delay(5);
|
|
Keyboard.press(KEY_U); // Push u
|
|
delay(5);
|
|
Keyboard.release(KEY_U); // Release u
|
|
delay(5);
|
|
Keyboard.release(MODIFIERKEY_LEFT_CTRL); // Release Left Control
|
|
delay(5);
|
|
Keyboard.release(MODIFIERKEY_LEFT_SHIFT); // Release Left Shift
|
|
delay(5);
|
|
Keyboard.press(KEY_5); // Push 5
|
|
delay(5);
|
|
Keyboard.release(KEY_5); // Release 5
|
|
delay(5);
|
|
Keyboard.press(KEY_C); // Push c
|
|
delay(5);
|
|
Keyboard.release(KEY_C); // Release c
|
|
delay(5);
|
|
Keyboard.press(KEY_ENTER); // Push Enter
|
|
delay(5);
|
|
Keyboard.release(KEY_ENTER); // Release Enter
|
|
delay(5);
|
|
*/
|
|
}
|
|
else if (normal[x][y] == KEY_X) { // Fn is pressed but no media key so check if KEY_X is pressed
|
|
// if using this keyboard on a Raspberry Pi, comment out the following Alt code section and uncomment the unicode section
|
|
// *******Windows PC Alt Code sequence to give a | is Alt 124*******************************
|
|
Keyboard.press(MODIFIERKEY_LEFT_ALT); // Push and hold Left Alt
|
|
delay(5);
|
|
Keyboard.press(KEYPAD_1); // Push 1
|
|
delay(5);
|
|
Keyboard.release(KEYPAD_1); // Release 1
|
|
delay(5);
|
|
Keyboard.press(KEYPAD_2); // Push 2
|
|
delay(5);
|
|
Keyboard.release(KEYPAD_2); // Release 2
|
|
delay(5);
|
|
Keyboard.press(KEYPAD_4); // Push 4
|
|
delay(5);
|
|
Keyboard.release(KEYPAD_4); // Release 4
|
|
delay(5);
|
|
Keyboard.release(MODIFIERKEY_LEFT_ALT); // Release Left Alt
|
|
delay(5);
|
|
// *******Raspberry Pi Unicode sequence to give a | is Control+Shift+u 7c Enter*****************************
|
|
/* Keyboard.press(MODIFIERKEY_LEFT_CTRL); // Push and hold Left Control
|
|
delay(5);
|
|
Keyboard.press(MODIFIERKEY_LEFT_SHIFT); // Push and hold Left Shift
|
|
delay(5);
|
|
Keyboard.press(KEY_U); // Push u
|
|
delay(5);
|
|
Keyboard.release(KEY_U); // Release u
|
|
delay(5);
|
|
Keyboard.release(MODIFIERKEY_LEFT_CTRL); // Release Left Control
|
|
delay(5);
|
|
Keyboard.release(MODIFIERKEY_LEFT_SHIFT); // Release Left Shift
|
|
delay(5);
|
|
Keyboard.press(KEY_7); // Push 7
|
|
delay(5);
|
|
Keyboard.release(KEY_7); // Release 7
|
|
delay(5);
|
|
Keyboard.press(KEY_C); // Push c
|
|
delay(5);
|
|
Keyboard.release(KEY_C); // Release c
|
|
delay(5);
|
|
Keyboard.press(KEY_ENTER); // Push Enter
|
|
delay(5);
|
|
Keyboard.release(KEY_ENTER); // Release Enter
|
|
delay(5);
|
|
*/
|
|
}
|
|
}
|
|
else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) { //check if key is not pressed, but was previously pressed
|
|
old_key[x][y] = HIGH; // Save state of key as "not pressed"
|
|
if (Fn_pressed) { // Fn is not pressed
|
|
if (keyboard_leds & 1) { // test if Num Lock is turned on
|
|
clear_slot(numlock[x][y]); //clear slot with key name from numlock matrix
|
|
send_normals(); // send all slots over USB including the key that just got released
|
|
}
|
|
else {
|
|
clear_slot(normal[x][y]); //clear slot with key name from normal matrix
|
|
send_normals(); // send all slots over USB including the key that just got released
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// **************end of normal and media key section
|
|
//
|
|
}
|
|
go_z(Row_IO[x]); // De-activate Row (send it to hi-z)
|
|
}
|
|
//
|
|
// **********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 (keyboard_leds & 1<<1) { // mask off all bits but D1 and test if set
|
|
go_1(CAPS_LED); // turn on the LED
|
|
}
|
|
else {
|
|
go_0(CAPS_LED); // turn off the LED
|
|
}
|
|
//
|
|
// Turn on the LED on the Teensy for Num Lock based on bit 0 in the keyboard_leds variable controlled by the USB host computer
|
|
//
|
|
if (keyboard_leds & 1) { // mask off all bits but D0 and test if set
|
|
go_1(NUM_LED); // turn on the Num Lock LED
|
|
}
|
|
else {
|
|
go_0(NUM_LED); // turn off the Num Lock LED
|
|
}
|
|
//
|
|
delay(25); // The overall keyboard scanning rate is about 30ms
|
|
}
|