334 lines
9.5 KiB
C++
334 lines
9.5 KiB
C++
/* Copyright 2020 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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// Revision History
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// May 15, 2020 - Original Release
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// This software only scans the Teensy I/O's in the con_pin[] matrix defined below.
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//
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// ********Note that this program reports the Teensy I/O numbers over USB, not the FPC pin numbers*****************
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// The FPC pins are connected to the Teensy I/O's as follows:
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// ***16 pin FPC Connector*** ***18 pin FPC Connector***
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// FPC 06,07,08,09,10,11,12,13,14,15,16,01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,16,17,18
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// I/O 06,05,20,04,21,03,22,02,23,01,00,07,24,08,09,10,11,12,33,25,32,26,27,28,31,30,29,18,19
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// Load the con_pin array with the Teensy 3.2 I/O numbers
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int con_pin[] = {6,5,20,4,21,3,22,2,23,1,0,7,24,8,9,10,11,12,33,25,32,26,27,28,31,30,29,18,19};
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//
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int total = 29; // The total number of I/O's listed in con_pin[]
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// load the key codes used in sending usb numbers, tab, and down arrow
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int key_1 = KEY_1;
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int key_2 = KEY_2;
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int key_3 = KEY_3;
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int key_4 = KEY_4;
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int key_5 = KEY_5;
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int key_6 = KEY_6;
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int key_7 = KEY_7;
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int key_8 = KEY_8;
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int key_9 = KEY_9;
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int key_0 = KEY_0;
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int key_tab = KEY_TAB;
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int key_down = KEY_DOWN;
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//
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// Function to set a pin as an input with a pullup so it's high unless grounded by a key press
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void go_z(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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// Function to set a pin as an output and drive it to a logic low (0 volts)
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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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// Function to send numbers over USB for display on an editor
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void usb_num(int num) // the numbers 0 thru 33 are sent over usb as 0 thru 33
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{
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switch (num) {
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case 0:
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Keyboard.set_key1(key_0);
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Keyboard.send_now();
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break;
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case 1:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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break;
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case 2:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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break;
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case 3:
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Keyboard.set_key1(key_3);
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Keyboard.send_now();
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break;
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case 4:
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Keyboard.set_key1(key_4);
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Keyboard.send_now();
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break;
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case 5:
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Keyboard.set_key1(key_5);
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Keyboard.send_now();
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break;
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case 6:
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Keyboard.set_key1(key_6);
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Keyboard.send_now();
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break;
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case 7:
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Keyboard.set_key1(key_7);
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Keyboard.send_now();
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break;
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case 8:
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Keyboard.set_key1(key_8);
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Keyboard.send_now();
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break;
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case 9:
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Keyboard.set_key1(key_9);
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Keyboard.send_now();
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break;
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case 10:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_0);
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Keyboard.send_now();
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break;
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case 11:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(50);
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Keyboard.set_key1(0);
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Keyboard.send_now();
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delay(50);
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Keyboard.set_key2(key_1);
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Keyboard.send_now();
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break;
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case 12:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_2);
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Keyboard.send_now();
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break;
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case 13:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_3);
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Keyboard.send_now();
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break;
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case 14:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_4);
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Keyboard.send_now();
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break;
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case 15:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_5);
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Keyboard.send_now();
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break;
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case 16:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_6);
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Keyboard.send_now();
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break;
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case 17:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_7);
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Keyboard.send_now();
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break;
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case 18:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_8);
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Keyboard.send_now();
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break;
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case 19:
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Keyboard.set_key1(key_1);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_9);
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Keyboard.send_now();
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break;
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case 20:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_0);
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Keyboard.send_now();
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break;
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case 21:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_1);
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Keyboard.send_now();
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break;
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case 22:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(50);
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Keyboard.set_key1(0);
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Keyboard.send_now();
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delay(50);
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Keyboard.set_key2(key_2);
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Keyboard.send_now();
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break;
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case 23:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_3);
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Keyboard.send_now();
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break;
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case 24:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_4);
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Keyboard.send_now();
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break;
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case 25:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_5);
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Keyboard.send_now();
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break;
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case 26:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_6);
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Keyboard.send_now();
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break;
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case 27:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_7);
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Keyboard.send_now();
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break;
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case 28:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_8);
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Keyboard.send_now();
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break;
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case 29:
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Keyboard.set_key1(key_2);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_9);
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Keyboard.send_now();
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break;
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case 30:
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Keyboard.set_key1(key_3);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_0);
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Keyboard.send_now();
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break;
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case 31:
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Keyboard.set_key1(key_3);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_1);
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Keyboard.send_now();
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break;
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case 32:
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Keyboard.set_key1(key_3);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key2(key_2);
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Keyboard.send_now();
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break;
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case 33:
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Keyboard.set_key1(key_3);
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Keyboard.send_now();
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delay(50);
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Keyboard.set_key1(0);
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Keyboard.send_now();
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delay(50);
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Keyboard.set_key2(key_3);
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Keyboard.send_now();
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break;
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}
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delay(20);
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Keyboard.set_key1(0); // clear out the key slots
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Keyboard.set_key2(0);
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key1(key_tab); // Tab over to position for next number
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key1(0); // clear out the tab from the slot
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Keyboard.send_now();
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delay(20);
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}
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// Function to send a down arrow over usb to position for the next key
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void down_arrow(void) {
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Keyboard.set_key1(key_down); // send a down arrow
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Keyboard.send_now();
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delay(20);
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Keyboard.set_key1(0); // release the down arrow
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Keyboard.send_now();
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}
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// --------------------------------------------------Setup-----------------------------------
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void setup() {
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for (int k = 0; k < total; k++) { // loop thru all row-column pins
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go_z(con_pin[k]); // set each pin as an input with a pullup
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}
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delay(15000); // Wait for the host to connect to the Teensy as a keyboard. If 2 pins are shorted,
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// you want the host to be ready to receive the pin numbers.
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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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//
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//
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for (int i=0; i<total-1; i++) { // outer loop index
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go_0(con_pin[i]); // make the outer loop pin an output and send this pin low
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for (int j=i+1; j<total; j++) { // inner loop index
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delayMicroseconds(10); // give time to let the signals settle out
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if (!digitalRead(con_pin[j])) { // check for connection between inner and outer pins
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usb_num(con_pin[i]); // send outer loop I/O number over usb
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usb_num(con_pin[j]); // send inner loop I/O number over usb
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down_arrow(); // send a down arrow over usb
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while(!digitalRead(con_pin[j])) { // wait until key is released
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; // if 2 pins are shorted, the code will hang here
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}
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}
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}
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go_z(con_pin[i]); // return the outer loop pin to float with pullup
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}
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//
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//
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delay(25); // overall keyboard scan rate is about 30 milliseconds
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//
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}
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