Delete IBM_380_revC.ino

2020-06-07 16:49:18 -07:00 · 2020-06-07 16:49:18 -07:00 · 286937ed47
commit 286937ed47
parent 111e009400
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--- a/380ED/IBM_380_revC.ino
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-/* Copyright 2020 Frank Adams
-   Licensed under the Apache License, Version 2.0 (the "License");
-   you may not use this file except in compliance with the License.
-   You may obtain a copy of the License at
-       http://www.apache.org/licenses/LICENSE-2.0
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-*/
-// This software implements an IBM Thinkpad 380ED Laptop USB Keyboard/Trackpoint Controller.
-// It uses a Teensy 3.2 on a custom FPC connector board that also has the amplifiers for the 
-// trackpoint that are fed into the Teensy ADC.
-//
-// Revision History
-// Initial Release May 16, 2020
-// Rev A May 17, 2020 - Added Fn-F9,F10,F11,F12 adjustments for trackpoint
-// Rev B May 27, 2020 - Changed Dead Zone methodology 
-// Rev C May 27, 2020 - Reduced noise_zone from 50 to 15; Reduced delay from 25ms to 8ms
-//
-#define MODIFIERKEY_FN 0x8f   // give Fn key a fake HID code 
-#define CAPS_LED 14 // Teensy I/O's connected to thru hole pads with resistors for LEDs
-#define NUM_LED 15
-#define SCRL_LED 16
-#define HEARTBEAT_LED 13 // onboard LED set to blink
-#define TP_LEFT 20 // Trackpoint mouse buttons connected to Teensy I/O's with pullups
-#define TP_RIGHT 5
-#define TP_RETURN 30 // will be driven low
-//
-const byte rows_max = 17; // sets the number of rows in the keyboard matrix
-const byte cols_max = 9; // sets the number of columns in the keyboard matrix
-//
-// Load the normal key matrix with the Teensyduino key names 
-// described at www.pjrc.com/teensy/td_keyboard.html 
-// A zero indicates no normal key at that location.
-int normal[rows_max][cols_max] = {
-  {KEY_ESC,KEY_TAB,KEY_TILDE,KEY_1,0,0,KEY_Z,KEY_A,KEY_Q},
-  {0,KEY_CAPS_LOCK,KEY_F1,KEY_2,0,0,KEY_X,KEY_S,KEY_W},
-  {0,0,0,0,0,0,0,0,0},
-  {KEY_G,KEY_T,KEY_5,KEY_4,KEY_B,0,KEY_V,KEY_F,KEY_R},
-  {KEY_H,KEY_Y,KEY_6,KEY_7,KEY_N,0,KEY_M,KEY_J,KEY_U},
-  {KEY_F6,KEY_LEFT_BRACE,KEY_EQUAL,KEY_8,0,0,KEY_COMMA,KEY_K,KEY_I},
-  {KEY_UP,0,KEY_HOME,KEY_END,KEY_LEFT,0,KEY_PAUSE,0,0},
-  {0,0,KEY_PAGE_UP,KEY_PAGE_DOWN,0,0,0,0,0},
-  {KEY_F4,KEY_F3,KEY_F2,KEY_3,0,0,KEY_C,KEY_D,KEY_E},
-  {KEY_QUOTE,KEY_LEFT_BRACE,KEY_MINUS,KEY_0,KEY_SLASH,0,0,KEY_SEMICOLON,KEY_P},
-  {KEY_F5,KEY_BACKSPACE,KEY_F9,KEY_F10,KEY_SPACE,0,KEY_ENTER,KEY_BACKSLASH,0},
-  {0,0,KEY_DELETE,KEY_F11,KEY_DOWN,0,0,0,0},
-  {0,0,0,KEY_PRINTSCREEN,0,0,0,0,KEY_NUM_LOCK},
-  {0,0,KEY_INSERT,KEY_F12,KEY_RIGHT,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,KEY_F7,KEY_F8,KEY_9,0,0,KEY_PERIOD,KEY_L,KEY_O}
-};
-// Load the numlock key matrix with key names at the correct row-column location. 
-// This matrix is the same as the normal matrix except for the number pad keys
-// A zero indicates no numlock key at that location.
-int numlock[rows_max][cols_max] = {
-  {KEY_ESC,KEY_TAB,KEY_TILDE,KEY_1,0,0,KEY_Z,KEY_A,KEY_Q},
-  {0,KEY_CAPS_LOCK,KEY_F1,KEY_2,0,0,KEY_X,KEY_S,KEY_W},
-  {0,0,0,0,0,0,0,0,0},
-  {KEY_G,KEY_T,KEY_5,KEY_4,KEY_B,0,KEY_V,KEY_F,KEY_R},
-  {KEY_H,KEY_Y,KEY_6,KEYPAD_7,KEY_N,0,KEYPAD_0,KEYPAD_1,KEYPAD_4},
-  {KEY_F6,KEY_LEFT_BRACE,KEY_EQUAL,KEYPAD_8,0,0,KEY_COMMA,KEYPAD_2,KEYPAD_5},
-  {KEY_UP,0,KEY_HOME,KEY_END,KEY_LEFT,0,KEY_PAUSE,0,0},
-  {0,0,KEY_UP,KEY_DOWN,0,0,0,0,0},
-  {KEY_F4,KEY_F3,KEY_F2,KEY_3,0,0,KEY_C,KEY_D,KEY_E},
-  {KEY_QUOTE,KEY_LEFT_BRACE,KEY_MINUS,KEYPAD_SLASH,KEYPAD_PLUS,0,0,KEYPAD_MINUS,KEYPAD_ASTERIX},
-  {KEY_F5,KEY_BACKSPACE,KEY_F9,KEY_F10,KEY_SPACE,0,KEY_ENTER,KEY_BACKSLASH,0},
-  {0,0,KEY_DELETE,KEY_F11,KEY_DOWN,0,0,0,0},
-  {0,0,0,KEY_PRINTSCREEN,0,0,0,0,KEY_NUM_LOCK},
-  {0,0,KEY_INSERT,KEY_F12,KEY_RIGHT,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,KEY_F7,KEY_F8,KEYPAD_9,0,0,KEYPAD_PERIOD,KEYPAD_3,KEYPAD_6}
-};
-// Load the modifier key matrix with key names at the correct row-column location. 
-// A zero indicates no modifier key at that location.
-int modifier[rows_max][cols_max] = {
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,MODIFIERKEY_LEFT_CTRL,0,0,0,MODIFIERKEY_RIGHT_CTRL,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {MODIFIERKEY_LEFT_ALT,0,0,0,MODIFIERKEY_RIGHT_ALT,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,MODIFIERKEY_FN,0,0,0},
-  {0,MODIFIERKEY_LEFT_SHIFT,0,0,0,0,MODIFIERKEY_RIGHT_SHIFT,0,0},
-  {0,0,0,0,0,0,0,0,0}
-};
-// Load the media key matrix with Fn key names at the correct row-column location. 
-// A zero indicates no media key at that location. 
-int media[rows_max][cols_max] = {
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,KEY_MEDIA_MUTE,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,KEY_MEDIA_VOLUME_INC,KEY_MEDIA_VOLUME_DEC,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},  
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,KEY_SYSTEM_WAKE_UP,0,0,0,0,KEY_SCROLL_LOCK},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0},
-  {0,0,0,0,0,0,0,0,0}  
-};
-// Initialize the old_key matrix with one's (nothing pressed). 
-// 1 = key not pressed, 0 = key is pressed
-boolean old_key[rows_max][cols_max] = {
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1},
-  {1,1,1,1,1,1,1,1,1}  
-};
-//
-// Assign the Teensy I/O row numbers
-int Row_IO[rows_max] = {7,8,9,10,11,12,18,19,24,25,26,27,28,29,31,32,33}; 
-//
-// Assign the column I/O numbers
-int Col_IO[cols_max] = {0,1,2,3,4,6,21,22,23}; 
-
-// declare and initialize trackpoint variables
-int x_read; // stores the reading from the X ADC
-int y_read; // same for the Y ADC
-char mx; // signed byte used by the Mouse.move function for x value. Positive value moves to the right
-char my; // positive y value moves down 
-int x_delta; // signed 16 bit value gives x movement amount
-int y_delta; // y version. 
-int x_center; //resting position of x sensor
-int y_center; //resting position of y sensor
-int noise_zone = 15; // dead zone around the center. Can be as low as 3 but cursor may start to drift so add some safety margin. 
-                        // Increase this number if the cursor moves without touching the TP. Decrease if too much force is needed.
-boolean left_button = 0; // on/off variable for left button, 1 = pushed
-boolean right_button = 0; // on/off variable for right button, 1 = pushed
-boolean old_left_button = 0; // on/off variable for left button from the previous cycle
-boolean old_right_button = 0; // on/off variable for right button from the previous cycle
-boolean button_change = 0; // Shows when the left or right buttons have changed, 1 = change
-// declare keyboard variables
-boolean slots_full = LOW; // Goes high when slots 1 thru 6 contain normal keys
-// slot 1 thru slot 6 hold the normal key values to be sent over USB. 
-int slot1 = 0; //value of 0 means the slot is empty and can be used.  
-int slot2 = 0; 
-int slot3 = 0; 
-int slot4 = 0; 
-int slot5 = 0; 
-int slot6 = 0;
-//
-int mod_shift_l = 0; // These variables are sent over USB as modifier keys.
-int mod_shift_r = 0; // Each is either set to 0 or MODIFIER_ ... 
-int mod_ctrl_l = 0;   
-int mod_ctrl_r = 0;
-int mod_alt_l = 0;
-int mod_alt_r = 0;
-int mod_gui = 0;
-//
-// Function to load the key name into the first available slot
-void load_slot(int key) {
-  if (!slot1)  {
-    slot1 = key;
-  }
-  else if (!slot2) {
-    slot2 = key;
-  }
-  else if (!slot3) {
-    slot3 = key;
-  }
-  else if (!slot4) {
-    slot4 = key;
-  }
-  else if (!slot5) {
-    slot5 = key;
-  }
-  else if (!slot6) {
-    slot6 = key;
-  }
-  if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6)  {
-    slots_full = LOW; // slots are not full
-  }
-  else {
-    slots_full = HIGH; // slots are full
-  } 
-}
-//
-// Function to clear the slot that contains the key name
-void clear_slot(int key) {
-  if (slot1 == key) {
-    slot1 = 0;
-  }
-  else if (slot2 == key) {
-    slot2 = 0;
-  }
-  else if (slot3 == key) {
-    slot3 = 0;
-  }
-  else if (slot4 == key) {
-    slot4 = 0;
-  }
-  else if (slot5 == key) {
-    slot5 = 0;
-  }
-  else if (slot6 == key) {
-    slot6 = 0;
-  }
-  if (!slot1 || !slot2 || !slot3 || !slot4 || !slot5 || !slot6)  {
-    slots_full = LOW; // slots are not full
-  }
-  else {
-    slots_full = HIGH; // slots are full
-  } 
-}
-//
-// Function to load the modifier key name into the appropriate mod variable
-void load_mod(int m_key) {
-  if (m_key == MODIFIERKEY_LEFT_SHIFT)  {
-    mod_shift_l = m_key;
-  }
-  else if (m_key == MODIFIERKEY_RIGHT_SHIFT)  {
-    mod_shift_r = m_key;
-  }
-  else if (m_key == MODIFIERKEY_LEFT_CTRL)  {
-    mod_ctrl_l = m_key;
-  }
-  else if (m_key == MODIFIERKEY_RIGHT_CTRL)  {
-    mod_ctrl_r = m_key;
-  }
-  else if (m_key == MODIFIERKEY_LEFT_ALT)  {
-    mod_alt_l = m_key;
-  }
-  else if (m_key == MODIFIERKEY_RIGHT_ALT)  {
-    mod_alt_r = m_key;
-  }
-  else if (m_key == MODIFIERKEY_GUI)  {
-    mod_gui = m_key;
-  }
-}
-//
-// Function to load 0 into the appropriate mod variable
-void clear_mod(int m_key) {
-  if (m_key == MODIFIERKEY_LEFT_SHIFT)  {
-    mod_shift_l = 0;
-  }
-  else if (m_key == MODIFIERKEY_RIGHT_SHIFT)  {
-    mod_shift_r = 0;
-  }
-  else if (m_key == MODIFIERKEY_LEFT_CTRL)  {
-    mod_ctrl_l = 0;
-  }
-  else if (m_key == MODIFIERKEY_RIGHT_CTRL)  {
-    mod_ctrl_r = 0;
-  }
-  else if (m_key == MODIFIERKEY_LEFT_ALT)  {
-    mod_alt_l = 0;
-  }
-  else if (m_key == MODIFIERKEY_RIGHT_ALT)  {
-    mod_alt_r = 0;
-  }
-  else if (m_key == MODIFIERKEY_GUI)  {
-    mod_gui = 0;
-  }
-}
-//
-// Function to send the modifier keys over usb
-void send_mod() {
-  Keyboard.set_modifier(mod_shift_l | mod_shift_r | mod_ctrl_l | mod_ctrl_r | mod_alt_l | mod_alt_r | mod_gui);
-  Keyboard.send_now();
-}
-//
-// Function to send the normal keys in the 6 slots over usb
-void send_normals() {
-  Keyboard.set_key1(slot1);
-  Keyboard.set_key2(slot2);
-  Keyboard.set_key3(slot3);
-  Keyboard.set_key4(slot4);
-  Keyboard.set_key5(slot5);
-  Keyboard.set_key6(slot6);
-  Keyboard.send_now();
-}
-//
-// Function to set a pin to high impedance (acts like open drain output)
-void go_z(int pin)
-{
-  pinMode(pin, INPUT);
-  digitalWrite(pin, HIGH);
-}
-//
-// Function to set a pin as an input with a pullup
-void go_pu(int pin)
-{
-  pinMode(pin, INPUT_PULLUP);
-  digitalWrite(pin, HIGH);
-}
-//
-// Function to send a pin to a logic low
-void go_0(int pin)
-{
-  pinMode(pin, OUTPUT);
-  digitalWrite(pin, LOW);
-}
-//
-// Function to send a pin to a logic high
-void go_1(int pin)
-{
-  pinMode(pin, OUTPUT);
-  digitalWrite(pin, HIGH);
-}
-//
-//----------------------------------Setup-------------------------------------------
-void setup() {
-// Trackpoint setup
-  delay(1000); // delay a second to let things settle out
-  analogReadRes(13); // set ADC resolution to 13 bits (16 bit ADC but low 3 bits are random noise)
-  analogReadAveraging(8); // ADC will take the average of 8 reads to filter noise.
-  x_center = analogRead(A11); // store the center (no movement) position for x
-  y_center = analogRead(A10); // same for y
-//
-  go_0(TP_RETURN); // set the return pin for the trackpoint left/right buttons to always low
-  go_pu(TP_RIGHT); // set right trackpoint button as input with a pullup
-  go_pu(TP_LEFT); // set left trackpoint button as input with a pullup
-// keyboard I/O setup  
-  for (int a = 0; a < cols_max; a++) {  // loop thru all column pins 
-    go_pu(Col_IO[a]); // set each column pin as an input with a pullup
-  }
-//
-  for (int b = 0; b < rows_max; b++) {  // loop thru all row pins 
-    go_z(Row_IO[b]); // set each row pin as a floating output
-  }  
-//
-  pinMode(HEARTBEAT_LED, OUTPUT); // drive the LED on the Teensy
-}
-//
-boolean Fn_pressed = HIGH; // Initialize Fn key to HIGH = "not pressed"
-extern volatile uint8_t keyboard_leds; // 8 bits sent from host to Teensy that give keyboard LED status.
-char blink_count = 0; // heartbeat loop counter
-boolean blinky = LOW; // heartbeat LED state
-//
-//---------------------------------Main Loop---------------------------------------------
-//
-void loop() {   
-// Scan keyboard matrix with an outer loop that drives each row low and an inner loop that reads every column (with pull ups).
-// The routine looks at each key's present state (by reading the column input pin) and also the previous state from the last scan
-// 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. 
-// The keyboard keys will read as logic low if they are pressed (negative logic).
-// The old_key matrix also uses negative logic (low=pressed). 
-//
-  for (int x = 0; x < rows_max; x++) {   // loop thru the rows
-    go_0(Row_IO[x]); // Activate Row (send it low)
-    delayMicroseconds(10); // give the row time to go low and settle out
-    for (int y = 0; y < cols_max; y++) {   // loop thru the columns
-// **********Modifier keys including the Fn special case
-      if (modifier[x][y] != 0) {  // check if modifier key exists at this location in the array (a non-zero value)
-        if (!digitalRead(Col_IO[y]) && (old_key[x][y])) {  // Read column to see if key is low (pressed) and was previously not pressed
-          if (modifier[x][y] != MODIFIERKEY_FN) {   // Exclude Fn modifier key  
-            load_mod(modifier[x][y]); // function reads which modifier key is pressed and loads it into the appropriate mod_... variable   
-            send_mod(); // function sends the state of all modifier keys over usb including the one that just got pressed
-            old_key[x][y] = LOW; // Save state of key as "pressed"
-          }
-          else {   
-            Fn_pressed = LOW; // Fn status variable is active low
-            old_key[x][y] = LOW; // old_key state is "pressed" (active low)
-          }
-        }
-        else if (digitalRead(Col_IO[y]) && (!old_key[x][y])) {  //check if key is not pressed and was previously pressed
-          if (modifier[x][y] != MODIFIERKEY_FN) { // Exclude Fn modifier key 
-            clear_mod(modifier[x][y]); // function reads which modifier key was released and loads 0 into the appropriate mod_... variable
-            send_mod(); // function sends all mod's over usb including the one that just released
-            old_key[x][y] = HIGH; // Save state of key as "not pressed"
-          }
-          else {
-            Fn_pressed = HIGH; // Fn is no longer active
-            old_key[x][y] = HIGH; // old_key state is "not pressed" 
-          }
-        }
-      } 
-// ***********end of modifier section
-//
-// ***********Normal keys, num lock keys and media keys in this section
-      else if ((normal[x][y] != 0) || (media[x][y] != 0)) {  // check if normal or media key exists at this location in the array
-        if (!digitalRead(Col_IO[y]) && (old_key[x][y]) && (!slots_full)) { // check if key pressed and not previously pressed and slots not full
-          old_key[x][y] = LOW; // Save state of key as "pressed"
-          if (Fn_pressed) {  // Fn_pressed is active low so it is not pressed and normal key needs to be sent
-            if (keyboard_leds & 1) {  // test if Num Lock is turned on
-              load_slot(numlock[x][y]); //update first available slot with key name from numlock matrix
-              send_normals(); // send all slots over USB including the key that just got pressed
-            }
-            else { // Num Lock is not turned on
-              load_slot(normal[x][y]); //update first available slot with key name from normal matrix
-              send_normals(); // send all slots over USB including the key that just got pressed
-            }
-          }
-          else if (media[x][y] != 0) { // Fn is pressed so send media if a key exists in the matrix
-            Keyboard.press(media[x][y]); // media key is sent using keyboard press function per PJRC    
-            delay(5); // delay 5 milliseconds before releasing to make sure it gets sent over USB
-            Keyboard.release(media[x][y]); // send media key release
-          }
-          else if (normal[x][y] == KEY_F12) { // Fn is active and F12 is pressed - recapture TP center
-            x_center = analogRead(A11); // store the center (no movement) position for x
-            y_center = analogRead(A10); // same for y
-          }
-          else if (normal[x][y] == KEY_F10) { // Fn is active and F10 is pressed - increase noise zone value by 5
-            noise_zone = noise_zone + 5;
-          }
-          else if (normal[x][y] == KEY_F9) { // Fn is active and F9 is pressed - decrease noise zone value by 5
-            if (noise_zone >= 5) { // don't allow noise zone to be reduced below zero because it will cause cursor drift
-              noise_zone = noise_zone - 5;
-            }
-          }
-          else if (normal[x][y] == KEY_F11) { // Fn is active and F11 is pressed - Set noise zone to default value of 50
-            noise_zone = 50;
-          }
-        }          
-        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, num lock, and media key section 
-//
-    }
-    go_z(Row_IO[x]); // De-activate Row (send it to hi-z)
-  }
-//
-// **********keyboard scan complete*******************************
-//
-// Control the 3 keyboard LEDs
-//
-  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
-  }
-//
-  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
-  }
-//
-  if (keyboard_leds & 1<<2) {  // mask off all bits but D2 and test if set
-    go_1(SCRL_LED); // turn on the Scroll Lock LED
-  }
-  else {
-    go_0(SCRL_LED); // turn off the Scroll Lock LED
-  }
-//
-// ******************Trackpoint Section******************
-//
-  mx = 0; // for each loop, start with zero and update only if movement detected
-  my = 0; // same for y
-// Read the ADC's
-  x_read = analogRead(A11); // read the ADC tied to the X sensor
-  y_read = analogRead(A10); // read the ADC tied to the Y sensor
-// Check if X or Y movement is beyond the dead zone
-  if ((x_read > (x_center + noise_zone)) || (x_read < (x_center - noise_zone)) || (y_read > (y_center + noise_zone)) || (y_read < (y_center - noise_zone))) {
-// Only do the following if at least one reading is beyond the dead zone.
-// Figure out if the X value is to the right or the left of the center resting value
-    if (x_read > x_center) {  // is X ADC to the right of the resting position?
-      x_delta = (x_read - x_center) / 10; // find out how far beyond center. Divide by 10 to slow it down.
-      mx = byte(x_delta); // convert signed 16 bit to signed 8 bit
-    }
-    else { // X ADC is equal or to the left of the resting position
-      x_delta = ((x_center - x_read) / 10) * -1; // Answer should be negative so multiply by -1
-      mx = byte(x_delta); // convert signed 16 bit to signed 8 bit
-    }
-// Figure out if the Y value is above or below the center resting value
-    if (y_read > y_center) { // is Y ADC above the resting position?
-      y_delta = ((y_read - y_center) / 10) * -1; // up movement is negative for Mouse.move function
-      my = byte(y_delta);  // convert signed 16 bit to signed 8 bit
-    }
-    else { // Y ADC is equal or below the resting position
-      y_delta = ((y_center - y_read) / 10);
-      my = byte(y_delta); // convert signed 16 bit to signed 8 bit
-    }
-  }
-// send the x and y data over usb if either one is not at center position
-  if ((mx != 0x00) || (my != 0x00)) {
-    Mouse.move(mx,my);
-  }
-// ***********************read the touchpad left and right buttons***********************************
-  if (!digitalRead(TP_RIGHT)) {   // check if right button is low (low = pushed) 
-    right_button = 1;   // save state of button
-  }
-  else {   // clear right button
-    right_button = 0;   // save state of button
-  }
-  if (!digitalRead(TP_LEFT)) {   // check if left button is low (low = pushed) 
-    left_button = 1;  // save state of button 
-  } 
-  else {   // clear left button
-    left_button = 0;  // save state of button
-  }
-// Determine if the left or right mouse buttons have changed (using XOR) since the last cycle 
-  button_change = (left_button ^ old_left_button) | (right_button ^ old_right_button);
-// Don't send button status if there's no change since last time 
-  if (button_change){
-    Mouse.set_buttons(left_button, 0, right_button); // send button status over USB
-  }
-  old_left_button = left_button; // remember button status for the next cycle
-  old_right_button = right_button;
-//
-// Blink the LED on the Teensy to show a heartbeat
-//
-  if (blink_count >= 0x54) {  
-    digitalWrite(HEARTBEAT_LED, blinky);
-    blinky = !blinky;
-    blink_count = 0;
-  }
-  else {
-    blink_count = blink_count + 1;
-  }
-//
-  delay(8); // The overall keyboard/trackpoint scanning rate is about 13ms
-}