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//
// This software is in the public domain.
// It will determine how a laptop keyboard matrix is wired using a Teensy LC on an FPC T61 daughterboard.
// Open an editor on a computer and load or create a file that lists every key
// on the laptop keyboard that will be tested. Connect the FPC cable of the test keyboard
// to the Teensy/FPC board. Connect a USB cable from the Teensy to the computer.
// Wait a few seconds for the computer to see the Teensy as a keyboard. If numbers are reported on the screen
// before any keys are pressed, these I/O numbers are shorted together and must be fixed.
// Press each key one by one on the test keyboard as listed on the editor screen. When a key
// is pressed on the test keyboard, the program detects which Teensy I/O's
// were connected. Those two I/O's are sent over USB (separated by a TAB) and displayed
// on the editor. After sending the numbers, a DOWN ARROW is sent over USB to prepare for
// the next key. Once all keys on the test keyboard have been pressed, the file in
// the editor can be saved to create a row-column matrix.
//
// Revision History
// Rev 1.00 - Nov 20, 2018 - Original Release
//
// FPC 02,03,04,05,06,07,08,09,10,11,12,13,14,15,16,17,18,20,22,24,26,28,30,32
// I/O 16,04,08,21,17,25,07,22,18,24,06,23,19,03,05,02,20,09,15,10,14,11,26,12
// Load an array with the Teensy LC I/O numbers that correspond to the FPC pins
int con_pin[] = {16,4,8,21,17,25,7,22,18,24,6,23,19,3,5,2,20,9,15,10,14,11,26,12};
//
// load the key codes used in sending usb numbers, tab, and down arrow
int key_1 = KEY_1;
int key_2 = KEY_2;
int key_3 = KEY_3;
int key_4 = KEY_4;
int key_5 = KEY_5;
int key_6 = KEY_6;
int key_7 = KEY_7;
int key_8 = KEY_8;
int key_9 = KEY_9;
int key_0 = KEY_0;
int key_tab = KEY_TAB;
int key_down = KEY_DOWN;
//
// Function to set a pin as an input with a pullup so it's high unless grounded by a key press
void go_z(int pin)
{
pinMode(pin, INPUT_PULLUP);
digitalWrite(pin, HIGH);
}
// Function to set a pin as an output and drive it to a logic low (0 volts)
void go_0(int pin)
{
pinMode(pin, OUTPUT);
digitalWrite(pin, LOW);
}
// Function to send numbers over USB for display on an editor
void usb_num(int num) // the numbers 0 thru 33 are sent over usb as 0 thru 33
{
switch (num) {
case 0:
Keyboard.set_key1(key_0);
Keyboard.send_now();
break;
case 1:
Keyboard.set_key1(key_1);
Keyboard.send_now();
break;
case 2:
Keyboard.set_key1(key_2);
Keyboard.send_now();
break;
case 3:
Keyboard.set_key1(key_3);
Keyboard.send_now();
break;
case 4:
Keyboard.set_key1(key_4);
Keyboard.send_now();
break;
case 5:
Keyboard.set_key1(key_5);
Keyboard.send_now();
break;
case 6:
Keyboard.set_key1(key_6);
Keyboard.send_now();
break;
case 7:
Keyboard.set_key1(key_7);
Keyboard.send_now();
break;
case 8:
Keyboard.set_key1(key_8);
Keyboard.send_now();
break;
case 9:
Keyboard.set_key1(key_9);
Keyboard.send_now();
break;
case 10:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_0);
Keyboard.send_now();
break;
case 11:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(50);
Keyboard.set_key1(0);
Keyboard.send_now();
delay(50);
Keyboard.set_key2(key_1);
Keyboard.send_now();
break;
case 12:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_2);
Keyboard.send_now();
break;
case 13:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_3);
Keyboard.send_now();
break;
case 14:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_4);
Keyboard.send_now();
break;
case 15:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_5);
Keyboard.send_now();
break;
case 16:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_6);
Keyboard.send_now();
break;
case 17:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_7);
Keyboard.send_now();
break;
case 18:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_8);
Keyboard.send_now();
break;
case 19:
Keyboard.set_key1(key_1);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_9);
Keyboard.send_now();
break;
case 20:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_0);
Keyboard.send_now();
break;
case 21:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_1);
Keyboard.send_now();
break;
case 22:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(50);
Keyboard.set_key1(0);
Keyboard.send_now();
delay(50);
Keyboard.set_key2(key_2);
Keyboard.send_now();
break;
case 23:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_3);
Keyboard.send_now();
break;
case 24:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_4);
Keyboard.send_now();
break;
case 25:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_5);
Keyboard.send_now();
break;
case 26:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_6);
Keyboard.send_now();
break;
case 27:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_7);
Keyboard.send_now();
break;
case 28:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_8);
Keyboard.send_now();
break;
case 29:
Keyboard.set_key1(key_2);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_9);
Keyboard.send_now();
break;
case 30:
Keyboard.set_key1(key_3);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_0);
Keyboard.send_now();
break;
case 31:
Keyboard.set_key1(key_3);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_1);
Keyboard.send_now();
break;
case 32:
Keyboard.set_key1(key_3);
Keyboard.send_now();
delay(20);
Keyboard.set_key2(key_2);
Keyboard.send_now();
break;
case 33:
Keyboard.set_key1(key_3);
Keyboard.send_now();
delay(50);
Keyboard.set_key1(0);
Keyboard.send_now();
delay(50);
Keyboard.set_key2(key_3);
Keyboard.send_now();
break;
}
delay(20);
Keyboard.set_key1(0); // clear out the key slots
Keyboard.set_key2(0);
Keyboard.send_now();
delay(20);
Keyboard.set_key1(key_tab); // Tab over to position for next number
Keyboard.send_now();
delay(20);
Keyboard.set_key1(0); // clear out the tab from the slot
Keyboard.send_now();
delay(20);
}
// Function to send a down arrow over usb to position for the next key
void down_arrow(void) {
Keyboard.set_key1(key_down); // send a down arrow
Keyboard.send_now();
delay(20);
Keyboard.set_key1(0); // release the down arrow
Keyboard.send_now();
}
// --------------------------------------------------Setup-----------------------------------
void setup() {
for (int k = 0; k < 24; k++) { // loop thru all connector pins
go_z(con_pin[k]); // set each pin as an input with a pullup
}
delay(15000); // Wait for the host to connect to the Teensy as a keyboard. If 2 pins are shorted,
// you want the host to be ready to receive the pin numbers.
}
//
// -------------------------------------------Main Loop--------------------------------------
//
void loop() {
//
//
for (int i=0; i<23; i++) { // outer loop index
go_0(con_pin[i]); // make the outer loop pin an output and send this pin low
for (int j=i+1; j<24; j++) { // inner loop index
delayMicroseconds(10); // give time to let the signals settle out
if (!digitalRead(con_pin[j])) { // check for connection between inner and outer pins
usb_num(con_pin[i]); // send outer loop I/O number over usb
usb_num(con_pin[j]); // send inner loop I/O number over usb
down_arrow(); // send a down arrow over usb
while(!digitalRead(con_pin[j])) { // wait until key is released
; // if 2 pins are shorted, the code will hang here
}
}
}
go_z(con_pin[i]); // return the outer loop pin to float with pullup
}
//
//
delay(25); // overall keyboard scan rate is about 30 milliseconds
//
}